Display control circuit, display panel and display device

Abstract

The invention discloses a display control circuit, a display panel and a display device. The display control circuit comprises a control unit and a plurality of cascaded scanning drive circuits corresponding to each partition. The scanning driving circuits corresponding to the N partitions are mutually independent, and the control unit is used for outputting a frame starting signal and a clock signal to the scanning driving circuit corresponding to the lightened partition and stopping outputting the frame starting signal and the clock signal to the scanning driving circuit corresponding to the non-lightened partition; or, the scanning drive circuits corresponding to the N partitions are cascaded in sequence, and the control unit is used for outputting a frame start signal to the scanning drive circuit corresponding to the target partition through one port of the N-path selector, outputting a clock signal to the target partition and the scanning drive circuit corresponding to the lightened partition after the target partition, and outputting a frame start signal to the scanning drive circuit corresponding to the lightened partition after the target partition. And stopping outputting the clock signal to the non-lighting subarea after the target subarea. The circuit can reduce the power consumption of the display screen.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display control circuit, a display panel and a display device. Background Art

[0002] With users' demand for portability of display devices and the demand for larger display panel sizes, display devices with foldable screens have emerged, such as upper and lower double folding screens, left and right double folding screens, and triple folding screens.

[0003] When the display device is displaying, a scanning driver circuit (Gate Driver On Array, GOA) drives a row of pixel units to display. For folding screen devices, when the folding screen device is in the folded state, there is a non-display area on the display screen, that is, an area where the pixels are not lit.

[0004] At present, for the non-display area of ​​the folding screen, the non-display area is often controlled to display black to show the non-display state, or the output of the GOA in the non-display area is directly controlled to control the pixel unit not to emit light. However, under the above control method, the scanning drive circuit corresponding to the non-display area is still in operation, resulting in high energy consumption of the display screen. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a display control circuit, a display panel and a display device, which can reduce the power consumption of a display screen.

[0006] In the first aspect, the present application provides a display control circuit. The display control circuit is applied to a display screen having N partitions, and includes a control unit and a plurality of cascaded scan drive circuits corresponding to each partition, wherein the scan drive circuits corresponding to the N partitions are respectively connected to N groups of signal terminals of the control unit, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit is used to output a frame start signal and a clock signal to the scan drive circuit corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit corresponding to the non-lit partition; or, a group of signal terminals of the control unit is connected to the scan drive circuit corresponding to the target partition among the N partitions through a port of an N-way selector, and the scan drive circuits corresponding to the N partitions are cascaded in sequence; the control unit is used to output a frame start signal to the scan drive circuit corresponding to the target partition through a port of the N-way selector, output a clock signal to the scan drive circuit corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

[0007] In combination with the first aspect, in a possible implementation method, the scanning drive circuits corresponding to N partitions are connected to N groups of signal terminals of the control unit, and when the lit partition includes multiple partitions, the control unit is used to determine the delay corresponding to each lit partition relative to the previous lit partition, and output the frame start signal and the clock signal to the scanning drive circuits corresponding to each lit partition in sequence according to the delay corresponding to each lit partition; the delay corresponding to the lit partition is related to the number of rows of pixel units of the previous lit partition of the lit partition.

[0008] In combination with the first aspect, in a possible implementation manner, when the target partition is a non-starting partition, the partition before the target partition is in a non-lit state.

[0009] In combination with the first aspect, in a possible implementation manner, when the scan driving circuits corresponding to the N partitions are connected to the N groups of signal terminals of the control unit, the refresh rates corresponding to the illuminated partitions are different.

[0010] In combination with the first aspect, in a possible implementation, the scan drive circuit includes a gate drive unit and a control unit, which is used to reduce the frequency of a frame start signal of the gate drive unit corresponding to the lit partition to reduce the refresh rate of the lit partition.

[0011] In combination with the first aspect, in a possible implementation method, the scanning drive circuit includes a light-emitting control unit, and when the scanning drive circuits corresponding to N partitions are connected to N groups of signal terminals of the control unit, the target group signal terminal in the N groups of signal terminals includes the target signal terminal corresponding to the light-emitting control unit of the scanning drive circuit, the light-emitting control units in the scanning drive circuits corresponding to different partitions are connected to the target signal terminal of the control unit, the frame start signal corresponding to the light-emitting control unit is a periodic signal, and the number of cycles of the frame start signal of the light-emitting control unit corresponding to the lit partition within one frame is related to the delay corresponding to the lit partition.

[0012] In combination with the first aspect, in a possible implementation, the number of cycles of the frame start signal corresponding to the light-emitting control unit within a frame is an integer multiple of a proportional parameter corresponding to the delay; the proportional parameter is a quotient of a frame time and the delay.

[0013] In combination with the first aspect, in a possible implementation, the N-way selector includes N switches, the control end of each switch is connected to the enable end of the control unit, the input end of each switch is connected to the signal end of the control unit, and the output end of each switch is respectively connected to the input end of the scanning drive circuit corresponding to the starting row pixel of each partition.

[0014] In combination with the first aspect, in a possible implementation manner, the control unit is further configured to adjust the voltage of the data signal of the illuminated partition according to the size of the illuminated partition; the voltage of the data signal is negatively correlated with the size of the illuminated partition.

[0015] In a second aspect, the present application provides a display panel, comprising the first aspect and the display control circuit described in any one of the first aspect.

[0016] In a third aspect, the present application provides a display device, comprising the display panel described in the second aspect.

[0017] The embodiment of the present application provides a display control circuit, a display panel and a display device, wherein the display control circuit is applied to a display screen having N partitions, the display control circuit includes a control unit and a plurality of cascaded scan drive circuits corresponding to each partition, the scan drive circuits corresponding to the N partitions are respectively connected to the N groups of signal terminals of the control unit, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit is used to output a frame start signal and a clock signal to the scan drive circuit corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit corresponding to the non-lit partition; or, a group of signal terminals of the control unit is connected to the scan drive circuit corresponding to the target partition in the N partitions through a port of an N-way selector, and the scan drive circuits corresponding to the N partitions are cascaded in sequence; the control unit is used to output a frame start signal to the scan drive circuit corresponding to the target partition through a port of the N-way selector, output a clock signal to the scan drive circuit corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition. That is, in the present application, the control unit realizes the display control of the N partitions of the display screen through different control methods according to different situations of whether the scan drive circuits of each partition are cascaded. During the display control process, by stopping the output of clock signals to non-lit partitions, or stopping the output of frame start signals and clock signals to non-lit partitions, the operation of the scanning drive circuit corresponding to the non-lit partitions is avoided, thereby saving the power consumption of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is the signal timing diagram corresponding to the 8T1C pixel circuit; Figure 2 It is a structural schematic diagram of an 8T1C pixel circuit; Figure 3 A schematic diagram showing the structure of a control circuit in one embodiment; Figure 4 is a schematic structural diagram of a scan drive circuit in one embodiment; Figure 5 A schematic diagram of the connection between a scan driving circuit and a control unit corresponding to a partition in an embodiment; Figure 6is a schematic diagram of the arrangement of pixel units in one embodiment; Figure 7 A schematic diagram of a signal timing sequence corresponding to a scan driving circuit in an embodiment; Figure 8 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig. 9 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.10 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.11 Another structural schematic diagram of a display control circuit in one embodiment; Fig.12 A schematic diagram of partitions of a display screen in one embodiment; Fig.13 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.14 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.15 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.16 is a schematic diagram of the structure of an N-way selector in one embodiment; Fig.17 is another signal timing diagram corresponding to the scan driving circuit in one embodiment; Fig.18 Another structural schematic diagram of a display control circuit in one embodiment; Fig.19 FIG. 4 is a schematic diagram of brightness compensation of a display control circuit in an embodiment. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In addition, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of objects.

[0021] With the user's demand for the portability of display devices and the demand for larger display panel sizes, display devices with foldable screens have emerged, such as double-folding screens up and down, double-folding screens left and right, and triple-folding screens. When the display device is displaying, a row of pixel units is driven by a scanning driver circuit (Gate Driver On Array, GOA) to display. The GOA circuit includes reset units P-Reset and H-Reset, gate driver units Gate-N and Gate-P, and a light-emitting control unit EM, which are respectively used to provide reset signals, gate drive signals, and light-emitting control signals to the pixel circuit to control the signal reset, data writing, and light-emitting time of the pixel circuit. For example, the output signals of each unit of the GOA circuit can be as follows: Figure 1 The timing control shown is as follows Figure 2 The 8T1C pixel circuit shown in the figure. Vsync is the vertical synchronization signal, V data is the data voltage, V init1 、V init2 and V init3 are the reset voltages of the pixel circuits respectively.

[0022] For folding screen devices, when the folding screen device is in the folded state, there is a non-display area on the display screen, that is, an area where the pixels are not lit. At present, for the non-display area of ​​the folding screen, the non-display area is often controlled to display black to show a non-display state, or the output of the GOA in the non-display area is directly controlled to control the pixel unit not to emit light. However, under the above control method, the scanning drive circuit corresponding to the non-display area is still in operation, resulting in high energy consumption of the display screen.

[0023] In one embodiment, Figure 3As shown, a display control circuit is provided, which is applied to a display screen with N partitions. The display control circuit includes a control unit 10 and a plurality of cascaded scan drive circuits 20 corresponding to each partition. The scan drive circuits 20 corresponding to the N partitions are respectively connected to N groups of signal terminals of the control unit 10, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit 10 is used to output a frame start signal and a clock signal to the scan drive circuit 20 corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit 20 corresponding to the non-lit partition. Alternatively, a group of signal terminals of the control unit 10 is connected to the scan drive circuit 20 corresponding to the target partition among the N partitions through a port of an N-way selector 30, and the scan drive circuits 20 corresponding to the N partitions are cascaded in sequence; the control unit 10 is used to output a frame start signal to the scan drive circuit 20 corresponding to the target partition through a port of the N-way selector 30, output a clock signal to the scan drive circuit 20 corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

[0024] In an embodiment of the present application, a display control circuit is provided, which includes a control unit 10 and a plurality of cascaded scan drive circuits 20 corresponding to each partition. The control unit may be a display driver integrated circuit (DDIC).

[0025] like Figure 3 As shown, the scanning driving circuits corresponding to each partition are independent of each other and have no electrical connection relationship. The dashed box in the figure is a plurality of cascaded scanning driving circuits 20 corresponding to one partition. Figure 4 As shown, a scan drive circuit 20 includes five units, namely, reset units P-Reset and H-Reset (i.e., RP and RH in the figure), gate drive units Gate-N and Gate-P (i.e., GN and GP in the figure), and light-emitting control unit EM. For the scan drive circuit 20 corresponding to the starting row pixel unit of a partition, the control unit 10 needs to provide a frame start signal (Start Vertical, STV) to the five units of the scan drive circuit 20 respectively, so as to drive the pixel units of each row of the partition to display through the cascaded scan drive circuit. Among them, ROW_1 is the starting row pixel unit of a partition, and ROW_2 is the second row pixel unit of the partition. Since the scanning drive circuits 20 corresponding to each partition are independent of each other, that is, the frame start signal corresponding to the partition lit first will not be transmitted to the partition lit later along with the cascaded scanning drive circuits 20, the scanning drive circuits 20 corresponding to each partition need to be connected to different groups of signal terminals of the control unit 10 so that the control unit 10 can realize independent control of different partitions. Figure 5 As shown, a connection mode between a scanning driving circuit 20 corresponding to a partition and a control unit 10 is provided, that is, the scanning driving circuit 20 corresponding to the starting row pixel unit of a partition is connected to a group of signal terminals of the control unit 10. Then the scanning driving circuits 20 corresponding to N partitions are respectively connected to the N groups of signal terminals of the control unit 10. A group of signal terminals includes five signal terminals, which are used to respectively provide PSTV signals, HSTV signals, GSTV signals, NSTV signals and ESTV signals. Among them, the PSTV signal is a frame start signal corresponding to the P-Reset unit, the HSTV signal is a frame start signal corresponding to the H-Reset unit, the GSTV signal is a frame start signal corresponding to the Gate-P unit, the NSTV signal is a frame start signal corresponding to the Gate-N unit, and the ESTV signal is a frame start signal corresponding to the EM unit.

[0026] It can be understood that a row of pixel units refers to a plurality of pixel units whose arrangement direction is consistent with the extension direction of the control unit. The starting row of pixel units of a partition is the first row of pixel units displayed in the partition under the display mode of line scanning drive, specifically, the row of pixel units farthest from the control unit in the partition; and the starting partition of the display screen is the first partition to display, specifically, the partition farthest from the control unit among the multiple partitions of the display screen. For example, Figure 6 As shown, if the display screen includes two partitions, namely the first partition (i.e., the A area in the figure) and the second partition (i.e., the B area in the figure), and the control unit is set on one side of the B area, then the multiple pixel units connected by a line in the figure are a row of pixel units, and the starting partition of the display screen is the first partition, the starting row of pixel units in the first partition is a1 in the figure, and the starting row of pixel units in the second partition is b1 in the figure. In a possible implementation, the display screen can be driven by a single-sided GOA, or by a double-sided GOA as shown in the figure, and this application does not limit this.

[0027] In the above circuit connection mode, the control unit 10 is used to output the frame start signal and the clock signal to the scanning driving circuit 20 corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scanning driving circuit 20 corresponding to the non-lit partition. Figure 6Taking the display screen shown as an example, the first partition is driven by the first frame start signal STV1 (including PSTV1, HSTV1, GSTV1, NSTV1 and ESTV1) and the clock signal CK / CB (including PCK / PCB, HCK / HCB, GCK / GCB, NCK / NCB and ECK / ECB), and the second partition is driven by the second frame start signal STV2 (including PSTV2, HSTV2, GSTV2, NSTV2 and ESTV2) and the clock signal CK / CB (including PCK / PCB, HCK / HCB, GCK / GCB, NCK / NCB and ECK / ECB). It can be understood that the clock signals of different units in a scan drive circuit are different, and different scan drive circuits or scan drive circuits of different partitions can be driven by the same clock signal. Therefore, the clock signals of the first partition and the second partition are not distinguished in the above.

[0028] like Figure 7 As shown, when the first partition is displayed alone, the first partition is a lit partition, and the second partition is a non-lit partition. The control unit 10 is used to output STV1 to the scan drive circuit corresponding to the starting row pixel unit of the first partition, and output the clock signal CK / CB to all the scan drive circuits corresponding to the first partition, so as to drive the scan drive circuit corresponding to the first partition to operate through STV1 and CK / CB, thereby lighting up the pixel units of the first partition row by row; at the same time, stop outputting STV2 to the scan drive circuit corresponding to the starting row pixel unit of the second partition, stop outputting the clock signal CK / CB to all the scan drive circuits corresponding to the second partition, avoid the scan drive circuit corresponding to the second partition from operating, and avoid lighting up the pixel units of the second partition. It should be noted that stopping outputting STV2 to the scan drive circuit corresponding to the starting row pixel unit of the second partition can specifically be outputting a constant voltage signal to the scan drive circuit corresponding to the starting row pixel unit of the second partition; similarly, stopping outputting the clock signal to all the scan drive circuits corresponding to the second partition can specifically be outputting a constant voltage signal to all the scan drive circuits corresponding to the second partition, so as to maintain the critical display state of the pixel units of the second partition.

[0029] like Figure 8As shown, when the second partition is displayed alone, the second partition is a lit partition, and the first partition is a non-lit partition. The control unit 10 is used to output STV2 to the scan drive circuit corresponding to the starting row pixel unit of the second partition, and output the clock signal CK / CB to all the scan drive circuits corresponding to the second partition, so as to drive the scan drive circuit corresponding to the second partition to operate through STV2 and CK / CB, thereby lighting up the pixel units of the second partition row by row; at the same time, stop outputting STV1 to the scan drive circuit corresponding to the starting row pixel unit of the first partition, stop outputting the clock signal CK / CB to all the scan drive circuits corresponding to the first partition, avoid the scan drive circuit corresponding to the first partition from operating, and avoid lighting up the pixel units of the first partition. It should be noted that stopping outputting STV1 to the scan drive circuit corresponding to the starting row pixel unit of the first partition can specifically be outputting a constant voltage signal to the scan drive circuit corresponding to the starting row pixel unit of the first partition; similarly, stopping outputting the clock signal to all the scan drive circuits corresponding to the first partition can specifically be outputting a constant voltage signal to all the scan drive circuits corresponding to the first partition, so as to maintain the critical display state of the pixel units of the first partition.

[0030] like Fig. 9 As shown, when the display screen is in full screen display, the first partition and the second partition are both lit partitions, and the control unit 10 is used to output STV1 and STV2 to the scan drive circuit corresponding to the starting row pixel unit of the first partition and the scan drive circuit corresponding to the starting row pixel unit of the second partition, respectively, and output the clock signal CK / CB to all the scan drive circuits of the display screen to drive all the scan drive circuits of the display screen to operate and light up all the pixel units of the display screen.

[0031] In one possible implementation, when the scanning drive circuits corresponding to N partitions are connected to N groups of signal terminals of the control unit, and the lit partition includes multiple partitions, in order to ensure the continuity of display between the multiple lit partitions, the control unit 10 is used to determine the delay corresponding to each lit partition relative to the previous lit partition, and output the frame start signal and the clock signal to the scanning drive circuit corresponding to each lit partition in sequence according to the delay corresponding to each lit partition.

[0032] In the embodiment of the present application, for each lit partition, it needs to be displayed with a delay relative to the last lit partition, that is, after the last lit partition has been lit up row by row from the starting row of pixel units to the last row of pixel units, the first row of pixel units in the lit partition begins to be lit. The last lit partition is the partition displayed before the lit partition.

[0033] It can be understood that the time delay of the lighting partition relative to the last lighting partition is the lighting time of the last lighting partition. In the row scanning drive mode, when the row scanning cycle is determined, the lighting time of a partition is related to the number of rows of pixel units in the partition. That is, the time delay corresponding to the lighting partition is related to the number of rows of pixel units in the last lighting partition of the lighting partition. Specifically, the time delay corresponding to the lighting partition is the product of the number of rows of pixel units in the last lighting partition and the row scanning cycle.

[0034] The following Figure 6 Take the display screen shown in the figure as an example to illustrate. In the case of full-screen display, the first partition is the last lit partition of the second partition, and the delay corresponding to the second partition is the lighting time of the first partition. Fig.10 As shown, the control unit 10 first outputs a first frame start signal STV1 to the scan drive circuit corresponding to the starting row of pixel units in the first partition, so as to sequentially light up each row of pixel units in the first partition through the cascaded scan drive circuit corresponding to the first partition. Then, after a delay corresponding to the second partition, when the first partition is completely lit, a second frame start signal STV2 is output to the scan drive circuit corresponding to the second partition, so as to sequentially light up each row of pixel units in the second partition through the cascaded scan drive circuit corresponding to the second partition, and finally complete the continuous lighting of the display screen in full screen display.

[0035] In one possible implementation, Figure 6 The display screen shown can be a three-fold display screen. In this case, the size of the first partition is 1 / 3 of the full screen size, and the size of the second partition is 2 / 3 of the full screen size. Then, the lighting time of the first partition is 1 / 3 of the one-frame time of the display screen. Therefore, in this case, the delay corresponding to the second partition can be 1 / 3 of the one-frame time of the display screen. That is, after driving the first partition to display, the control unit 10 drives the second partition to display after an interval of 1 / 3 of a frame.

[0036] The above embodiment illustrates the way in which the control unit independently controls each partition, that is, the specific control method of the control unit 10 when the scan drive circuits corresponding to each partition are independent of each other and the scan drive circuits corresponding to each partition are driven by different groups of signal terminals of the control unit. Under this control method, the operation of the scan drive circuit corresponding to the non-lit partition can be avoided by stopping the output of the frame start signal and the clock signal to the scan drive circuit corresponding to the non-lit partition for the sub-lit partition, thereby achieving the effect of saving the power consumption of the display screen.

[0037] In one embodiment, Fig.11As shown, the display control circuit may further include an N-way selector 30, and the scan drive circuits 20 corresponding to the N partitions of the display screen may be cascaded in sequence. The control unit 10 may realize display control of the N partitions through a group of signal terminals and the N-way selector 30, that is, a group of signal terminals of the control unit 10 is connected to the scan drive circuit 20 corresponding to the target partition among the N partitions through a port of the N-way selector 30. In this circuit connection mode, the control unit 10 is used to output a frame start signal to the scan drive circuit 20 corresponding to the target partition through a port of the N-way selector 30, output a clock signal to the scan drive circuit 20 corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

[0038] The target partition is the first partition that is lit among all the lit partitions of the display screen. Fig.12 As shown, if the display screen includes the first partition, the second partition, the third partition, the fourth partition and the fifth partition in the driving order (the direction of the arrow in the figure). In some cases, it is necessary to light up the second partition, the fourth partition and the fifth partition of the display screen, then the target partition is the second partition. The lit partitions after the target partition are the fourth partition and the fifth partition, and the non-lit partition after the target partition is the third partition. It can be understood that when the target partition is a non-starting partition, the partition before the target partition is in a non-lit state, such as the first partition in the figure. And when the lit partition includes the starting partition, the lit partition is the starting partition.

[0039] In the actual driving control process, the control unit 10 is used to output a frame start signal to the scan drive circuit 20 corresponding to the target partition through a port of the N-way selector 30. The frame start signal can be transmitted through the scan drive circuit cascaded within the partition and the scan drive circuit cascaded between the partitions to sequentially drive the pixel units of the target partition and the partitions after the target partition to display; at the same time, the control unit 10 also needs to output a clock signal to the target partition and the illuminated partitions after the target partition, so that the pixel units of the target partition and the illuminated partitions after the target partition are normally illuminated under the drive of the frame start signal and the clock signal. Since the scan drive circuits corresponding to the partitions are cascaded, the frame start signal output to the target partition will be transmitted to the non-illuminated partition. In order to avoid the display of the non-illuminated partition after the target partition, the control unit 10 can stop outputting the clock signal to the non-illuminated partition after the target partition to avoid the operation of the drive control circuit corresponding to the non-illuminated partition after the target partition, thereby avoiding the display of the non-illuminated partition.

[0040] The following Figure 6 The display screen shown is used as an example. Fig.13As shown, when the first partition is displayed alone, the first partition is the target partition, and the second partition is the non-lit partition after the target partition. The control unit 10 outputs the first frame start signal STV1 and the clock signal to the first partition through the N-way selector 30, and stops outputting the clock signal to the second partition. Even if the first frame start signal STV1 is transmitted to the scan drive circuit corresponding to the second partition through the cascaded scan drive circuit, since the control unit 10 does not output the clock signal to the second partition, the scan drive circuit corresponding to the second partition will not operate, and the pixel unit of the second partition will not light up.

[0041] like Fig.14 As shown, when the second partition is displayed alone, the second partition is the target partition, and the first partition is in a non-lit state. The control unit 10 outputs the second frame start signal STV2 and the clock signal to the second partition through the N-way selector.

[0042] like Fig.15 As shown, when the display screen is in full screen display, the first partition is the target partition, and the second partition is the lit partition after the target partition. The control unit 10 outputs the first frame start signal STV1 to the first partition through the N-way selector 30, and outputs the clock signal to the scan drive circuits corresponding to the first partition and the second partition. In this case, the first frame start signal STV1 can be transmitted to the scan drive circuit corresponding to the second partition through the cascaded scan drive circuit, so that the scan drive circuit corresponding to the second partition operates under the drive of the clock signal and the output signal of the last cascaded scan drive circuit of the first partition, thereby lighting up the pixel unit of the second partition.

[0043] It should be noted that stopping outputting the clock signal to the scan driving circuit corresponding to the non-lit partition after the target partition may specifically be outputting a constant voltage signal to the scan driving circuit corresponding to the non-lit partition after the target partition, for example Fig.13 A constant voltage signal of a medium-low level Low or a high level High is used to maintain the critical display state of the pixel unit of the non-lit partition.

[0044] In a possible implementation, the N-way selector includes N switches, the control end of each switch is connected to the enable end of the control unit, the input end of each switch is connected to the signal end of the control unit, and the output end of each switch is respectively connected to the input end of the scan drive circuit corresponding to the starting row pixel of each partition. The control unit 10 can send different enable signals through the enable end to turn on different switches, and then turn on the path between the signal end and the scan drive circuit corresponding to the starting row pixel of the partition corresponding to the switch, output a frame start signal to the partition, and realize lighting of the partition. Among them, the switch can be a thin film transistor (TFT).

[0045] The following is still Figure 6 The display screen shown in FIG. 1 is used as an example for explanation. In the case where the display screen includes two partitions, the N-way selector is a two-way selector. Fig.16 As shown, the two-way selector may include a first transistor T11 and a second transistor T12, and the control terminals of the first transistor T11 and the second transistor T12 are connected to the enable terminal of the control unit 10, and are used to receive the enable signal EN output by the control unit 10. The input terminals of the first transistor T11 and the second transistor T12 are connected to a group of signal terminals of the control unit, and are used to receive the first frame start signal or the second frame start signal (i.e., STV1 / 2) output by the control unit 10. The output terminal of the first transistor T11 is connected to the input terminal of the scan driving circuit corresponding to the starting row pixel unit of the first partition, and is used to output the received first frame start signal STV1 to the scan driving circuit corresponding to the first partition when it is turned on; the output terminal of the second transistor T12 is connected to the input terminal of the scan driving circuit corresponding to the starting row pixel unit of the second partition, and is used to output the received second frame start signal STV2 to the scan driving circuit corresponding to the second partition when it is turned on.

[0046] The first transistor T11 and the second transistor T12 are thin film transistors of different types. For example, the first transistor T11 is a P-type transistor, and the second transistor T12 is an N-type transistor.

[0047] In specific implementation, when the first partition is displayed separately or the display screen is displayed in full screen, the control unit 10 outputs a first enable signal (for example, a low-level signal) to the control end of the first transistor T11 and the second transistor T12 through the enable end to turn on the first transistor T11, and turn on the path between the signal end of the control unit 10 and the scanning drive circuit corresponding to the starting row pixel unit of the first partition, so that the first frame start signal STV1 can be output to the scanning drive circuit corresponding to the starting row pixel unit of the first partition.

[0048] When the second partition is displayed separately, the control unit 10 outputs a second enable signal (for example, a high-level signal) to the control end of the first transistor T11 and the second transistor T12 through the enable end to turn on the second transistor T12, and turn on the path between the signal end of the control unit 10 and the scanning drive circuit corresponding to the starting row pixel unit of the second partition, so that the second frame start signal STV2 can be output to the scanning drive circuit corresponding to the starting row pixel unit of the second partition.

[0049] The display control circuit provided in the embodiment of the present application is applied to a display screen with N partitions, and the display control circuit includes a control unit and a plurality of cascaded scan drive circuits corresponding to each partition, the scan drive circuits corresponding to the N partitions are respectively connected to the N groups of signal terminals of the control unit, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit is used to output a frame start signal and a clock signal to the scan drive circuit corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit corresponding to the non-lit partition; or, a group of signal terminals of the control unit is connected to the scan drive circuit corresponding to the target partition in the N partitions through a port of an N-way selector, and the scan drive circuits corresponding to the N partitions are cascaded in sequence; the control unit is used to output a frame start signal to the scan drive circuit corresponding to the target partition through a port of the N-way selector, output a clock signal to the scan drive circuit corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition. That is, in the present application, the control unit realizes the display control of the N partitions of the display screen through different control methods according to different situations of whether the scan drive circuits of each partition are cascaded. During the display control process, by stopping the output of clock signals to non-lit partitions, or stopping the output of frame start signals and clock signals to non-lit partitions, the operation of the scanning drive circuit corresponding to the non-lit partitions is avoided, thereby saving the power consumption of the display screen.

[0050] In one embodiment, when the scan driving circuits corresponding to the N partitions are connected to the N groups of signal terminals of the control unit, the refresh rates corresponding to the illuminated partitions are different.

[0051] In the embodiment of the present application, the scanning driving circuits corresponding to the N partitions are connected to the N groups of signal terminals of the control unit. In this case, the scanning driving circuits corresponding to the N partitions are not cascaded, and the control unit 10 can realize independent control of each partition. Therefore, the control unit 10 can also realize independent control of the refresh rate of each lit partition. That is, the refresh rate corresponding to each lit partition can be different.

[0052] For example, when a user uses multiple partitions of the N partitions of the display screen, the multiple used partitions are the lit partitions. In different application scenarios, the refresh rate requirements of some of the lit partitions are not high, so the refresh rate of the partially lit partitions can be appropriately reduced to reduce the power consumption of the display screen.

[0053] In specific implementation, the refresh rate of the partition can be controlled by the gate driving unit in the scanning driving circuit, that is, the control unit is used to reduce the frequency of the frame start signal of the gate driving unit corresponding to the illuminated partition to reduce the refresh rate of the illuminated partition.

[0054] Depend on Figure 2As can be seen from the pixel circuit shown in FIG. 1 , the gate driving signals Gate_P and Gate_N are key signals for lighting a pixel unit, especially the Gate_N signal. Figure 2 The last signal required for the normal operation of the 8T1C pixel circuit shown. If there is an error in the gate drive signal, the pixel circuit cannot operate normally and the pixel unit cannot be lit. Therefore, the gate drive signals Gate_P and Gate_N are output by the gate drive unit in the drive circuit. Therefore, the control unit 10 can control the refresh rate of the lit partition by controlling the frequency of the frame start signal of the gate drive unit in the scan drive circuit corresponding to the lit partition and the output frequency of the gate drive signal of the gate drive unit.

[0055] When the refresh rate of the illuminated partition is required to be reduced, the control unit can reduce the refresh rate of the illuminated partition by reducing the frequency of the frame start signal of the gate driving unit corresponding to the illuminated partition. For example, the display screen includes a first partition and a second partition, and the refresh rate of the second partition can be reduced. Fig.17 As shown, for the frame start signal NSTV2 required by the gate drive signal unit of the scan drive circuit of the second partition, the control unit 10 can output only one frame start signal NSTV2 in two frames, so that the pixel circuit only receives one gate drive signal Gate_N in two frames, and the pixel unit is only lit once in two frames. The refresh rate of the second partition is reduced by half. For example, if the original refresh rate of the second partition is 120Hz, when the control unit 10 outputs only one frame start signal NSTV2 in two frames, the refresh rate of the second partition becomes 60Hz.

[0056] In the circuit provided in the embodiment of the present application, when the scanning drive circuits corresponding to N partitions are connected to N groups of signal terminals of the control unit, the control unit can reduce the frequency of the frame start signal of the gate drive unit corresponding to the lit partition to reduce the refresh rate of the lit partition, thereby achieving the effect of reducing the power consumption of the lit partition, and thereby reducing the power consumption of the display screen.

[0057] In one embodiment, Fig.18 As shown, the scanning drive circuit 20 includes a light-emitting control unit, and when the scanning drive circuits corresponding to N partitions are connected to N groups of signal terminals of the control unit 10, the target group signal terminals in the N groups of signal terminals include the target signal terminals corresponding to the light-emitting control unit of the scanning drive circuit 20, and the light-emitting control units in the scanning drive circuits corresponding to different partitions are connected to the target signal terminals of the control unit 10, and the frame start signal corresponding to the light-emitting control unit is a periodic signal, and the number of periods of the frame start signal of the light-emitting control unit corresponding to the lit partition within one frame is related to the delay corresponding to the lit partition.

[0058] In the embodiment of the present application, the scanning driving circuits corresponding to the N partitions are independent of each other and are respectively connected to the N groups of signal terminals of the control unit. Considering that when the display screen has multiple lit partitions, each lit partition has a time delay relative to the previous lit partition, and Fig.10 As shown, the frame start signal ESTV corresponding to the light-emitting control unit EM in the scanning drive circuit 20 is a periodic signal. Therefore, by setting the number of periods of ESTV in one frame, the ESTV corresponding to the last lit partition can still overlap with the ESTV required for the current lit partition after a delay. That is, the last lit partition and the current lit partition can share one ESTV. As for the control unit 10, the control unit 10 can be connected to the light-emitting control unit in the scanning drive circuit corresponding to each partition through a signal terminal, and output ESTV to the light-emitting control unit in the scanning drive circuit corresponding to each lit partition, thereby reducing the occupancy of the signal terminal of the control unit 10. The control unit 10 reduces the control of one signal, which can also achieve the effect of reducing power consumption.

[0059] In order to realize that the ESTV corresponding to the currently lit partition can overlap with the ESTV corresponding to the last lit partition, the number of cycles of the frame start signal corresponding to the light control unit in one frame is an integer multiple of the proportional parameter corresponding to the delay. The proportional parameter is the quotient of the time of one frame and the delay.

[0060] Take a display screen having two partitions, where the size of the first partition is 1 / 3 of the size of the display screen (e.g., a three-fold display screen) as an example for explanation. The scanning drive circuits corresponding to the two partitions are connected to two groups of signal terminals of the control unit 10, the first group of signal terminals is used to output the frame start signal (PSTV1, HSTV1, GSTV1, NSTV1, and ESTV) of the scanning drive circuit corresponding to the first partition, and the second group of signal terminals is used to output the frame start signal (PSTV2, HSTV2, GSTV2, NSTV2, and ESTV) of the scanning drive circuit corresponding to the second partition. The first group of signal terminals is the target group signal terminal, and the signal terminal in the first group of signal terminals used to output the frame start signal ESTV corresponding to the light-emitting control unit of the scanning drive circuit 20 is the target signal terminal. The target signal terminal is connected to both the light-emitting control units in the scanning drive circuits corresponding to the first partition and the second partition.

[0061] The frame start signal corresponding to the light-emitting control unit is a periodic signal. When both the first partition and the second partition are displayed, the frame start signal corresponding to the second partition has a time delay relative to the frame start signal corresponding to the first partition, and the time delay is 1 / 3 of a frame time. The proportional parameter of the delay corresponding to the second partition is 3, and the number of cycles of the frame start signal ESTV of the light-emitting control unit within a frame should be set to an integer multiple of 3. Under this setting, ESTV is delayed by 1 / 3 of a frame, which is consistent with the frame start signal ESTV required by the light-emitting control unit corresponding to the second partition, and can also drive the light-emitting control unit corresponding to the second partition to operate normally. It can be understood that in this case, the occupied pins of the control unit 10 are reduced from 10 to 9, and at the same time, the control unit 10 reduces the control of one ESTV signal, which can reduce the power consumption of the display screen.

[0062] The circuit provided in the embodiment of the present application can set the number of cycles of the frame start signal of the light-emitting control unit within a frame so that the set frame start signal can normally drive the light-emitting control units corresponding to each partition of the display screen, so that the control unit can drive the light-emitting control units of each partition only through one signal terminal, thereby reducing the pins occupied by the light-emitting control unit, reducing the number of signals required to be output by the control unit, and reducing the power consumption of the display screen.

[0063] In one embodiment, the control unit 10 is further configured to adjust the voltage of the data signal of the illuminated partition according to the size of the illuminated partition.

[0064] In the embodiment of the present application, since the brightness of the display screen is set in the full-screen display state during the preparation process, when the display screen is displayed in partitions, the number of illuminated pixel units is reduced, that is, the optical pixel rate (OPR) of the display screen is reduced, and the load of the display screen is reduced, which will cause the brightness of the display screen to increase, that is, the brightness of the display screen will suddenly change during the switching of the illuminated partitions. Therefore, it is necessary to perform voltage drop compensation (IRDrop Compensation, IRC) on the display screen to avoid the brightness of the display screen. For example, Fig.19 As shown, if the display screen is compensated for voltage drop, the brightness will not change when the OPR of the display screen is different; if the display screen is not compensated for voltage drop, the brightness will increase when the OPR of the display screen decreases.

[0065] In a specific implementation, the brightness of the lit partition can be adjusted by adjusting the voltage of the data signal of the lit partition of the display screen (i.e., Vdata), so that when the overall size of the lit partition is different, the brightness remains unchanged. For example, the correspondence between the different sizes of the lit partition and the data signal voltage is preset in advance. Among them, the size of the lit partition can represent the OPR of the display screen. During the display screen display process, the control unit 10 can determine the voltage of the data signal by the size of the current lit partition and the above-mentioned preset correspondence.

[0066] The voltage of the data signal is negatively correlated with the size of the illuminated partition, that is, when the size of the illuminated partition is reduced, the display screen load is reduced, and the display screen brightness is increased, the voltage of the data signal needs to be increased to reduce the brightness of the display screen.

[0067] In a possible implementation, the correspondence between different partition combinations of the display screen and the data signal voltage can also be preset in advance. During the display screen display process, the control unit 10 can determine the voltage of the data signal through the preset correspondence and the currently lit partition, and output the data signal to the lit partition according to the determined data signal voltage. For example, for a display screen having a first partition and a second partition, the data voltage when the first partition is displayed alone, the data voltage when the second partition is displayed alone, and the data voltage when the full screen is displayed can be preset, so that when the lit partition is switched based on the above settings, the brightness of the display screen remains unchanged.

[0068] The control unit in the circuit provided in the embodiment of the present application can adjust the voltage of the data signal of the illuminated partition according to the size of the illuminated partition to maintain the brightness of the display screen and avoid the problem of sudden brightness change.

[0069] In one embodiment, a display panel is provided, which includes the display control circuit described in the above embodiment. The display control circuit is applied to a display screen with N partitions, and the display control circuit includes a control unit 10 and a plurality of cascaded scan drive circuits 20 corresponding to each partition, the scan drive circuits 20 corresponding to the N partitions are respectively connected to the N groups of signal terminals of the control unit 10, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit 10 is used to output a frame start signal and a clock signal to the scan drive circuit 20 corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit 20 corresponding to the non-lit partition. Alternatively, a group of signal terminals of the control unit 10 is connected to the scan drive circuit 20 corresponding to the target partition among the N partitions through a port of an N-way selector 30, and the scan drive circuits 20 corresponding to the N partitions are cascaded in sequence; the control unit 10 is used to output a frame start signal to the scan drive circuit 20 corresponding to the target partition through a port of the N-way selector 30, output a clock signal to the scan drive circuit 20 corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

[0070] In the embodiment of the present application, the control unit realizes the display control of the N partitions of the display screen through different control methods according to the different situations of whether the scanning driving circuits of each partition are cascaded. In the display control process, the clock signal is stopped from being output to the non-lit partition, or the frame start signal and the clock signal are stopped from being output to the non-lit partition, so as to avoid the operation of the scanning driving circuit corresponding to the non-lit partition, thereby achieving the effect of saving the power consumption of the display screen, and thus saving the power consumption of the display panel.

[0071] In one embodiment, a display device is provided, which includes the display panel described in the above embodiment, and the display panel includes a display control circuit. The display control circuit is applied to a display screen with N partitions, and the display control circuit includes a control unit 10 and a plurality of cascaded scan drive circuits 20 corresponding to each partition, and the scan drive circuits 20 corresponding to the N partitions are respectively connected to the N groups of signal terminals of the control unit 10, and the scan drive circuits corresponding to the N partitions are independent of each other; the control unit 10 is used to output a frame start signal and a clock signal to the scan drive circuit 20 corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scan drive circuit 20 corresponding to the non-lit partition. Alternatively, a group of signal terminals of the control unit 10 is connected to the scan drive circuit 20 corresponding to the target partition among the N partitions through a port of an N-way selector 30, and the scan drive circuits 20 corresponding to the N partitions are cascaded in sequence; the control unit 10 is used to output a frame start signal to the scan drive circuit 20 corresponding to the target partition through a port of the N-way selector 30, output a clock signal to the scan drive circuit 20 corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

[0072] In the embodiment of the present application, the control unit realizes the display control of the N partitions of the display screen through different control methods according to the different situations of whether the scanning driving circuits of each partition are cascaded. In the display control process, the operation of the scanning driving circuit corresponding to the non-lit partition is avoided by stopping the output of the clock signal to the non-lit partition, or stopping the output of the frame start signal and the clock signal to the non-lit partition, so as to achieve the effect of saving the power consumption of the display screen, thereby saving the power consumption of the display panel; further, the power consumption of the display device can be reduced.

[0073] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A display control circuit, characterized in that: Applied to a display screen having N partitions, the display control circuit includes a control unit and a plurality of cascaded scan drive circuits corresponding to each partition. The scanning drive circuits corresponding to the N partitions are respectively connected to the N groups of signal terminals of the control unit, and the scanning drive circuits corresponding to the N partitions are independent of each other; the control unit is used to output a frame start signal and a clock signal to the scanning drive circuit corresponding to the lit partition, and stop outputting the frame start signal and the clock signal to the scanning drive circuit corresponding to the non-lit partition; Alternatively, a group of signal terminals of the control unit are connected to a scan driving circuit corresponding to a target partition among the N partitions through a port of an N-way selector, and the scan driving circuits corresponding to the N partitions are cascaded in sequence; The control unit is used to output a frame start signal to the scanning drive circuit corresponding to the target partition through a port of the N-way selector, output a clock signal to the scanning drive circuit corresponding to the target partition and the lit partition after the target partition, and stop outputting the clock signal to the non-lit partition after the target partition.

2. The circuit according to claim 1, characterized in that The scanning driving circuits corresponding to the N partitions are connected to the N groups of signal terminals of the control unit, and when the lighting partition includes multiple partitions, The control unit is used to determine the delay corresponding to each of the lit partitions relative to the previous lit partition, and output a frame start signal and a clock signal to the scanning drive circuit corresponding to each of the lit partitions in sequence according to the delay corresponding to each of the lit partitions; the delay corresponding to the lit partition is related to the number of rows of pixel units of the previous lit partition of the lit partition.

3. The circuit according to claim 1, characterized in that When the target partition is a non-starting partition, the partition before the target partition is in a non-lit state.

4. The circuit according to claim 1, characterized in that When the scan driving circuits corresponding to the N partitions are connected to the N groups of signal terminals of the control unit, the refresh rates corresponding to the lighted partitions are different.

5. The circuit according to claim 4, characterized in that The scanning driving circuit includes a gate driving unit, The control unit is used to reduce the frequency of the frame start signal of the gate driving unit corresponding to the lit partition, so as to reduce the refresh rate of the lit partition.

6. The circuit according to claim 1, characterized in that The scanning driving circuit includes a light emitting control unit, and when the scanning driving circuits corresponding to the N partitions are connected to N groups of signal terminals of the control unit, a target group of signal terminals in the N groups of signal terminals include a target signal terminal corresponding to the light emitting control unit of the scanning driving circuit, and the light emitting control units in the scanning driving circuits corresponding to different partitions are connected to the target signal terminal of the control unit. The frame start signal corresponding to the light emitting control unit is a periodic signal, and the number of periods of the frame start signal of the light emitting control unit corresponding to the lighting partition within one frame is related to the time delay corresponding to the lighting partition.

7. The circuit according to claim 6, characterized in that The number of cycles of the frame start signal corresponding to the light-emitting control unit within one frame is an integer multiple of the proportional parameter corresponding to the time delay; the proportional parameter is the quotient of the time of one frame and the time delay.

8. The circuit according to claim 1, characterized in that The N-way selector includes N switches, the control end of each switch is connected to the enable end of the control unit, the input end of each switch is connected to the signal end of the control unit, and the output end of each switch is respectively connected to the input end of the scanning drive circuit corresponding to the starting row pixel of each partition.

9. The circuit according to claim 1, characterized in that The control unit is further configured to adjust the voltage of the data signal of the illuminated partition according to the size of the illuminated partition; the voltage of the data signal is negatively correlated with the size of the illuminated partition.

10. A display panel, characterized in that: The display panel comprises the display control circuit according to any one of claims 1 to 9.

11. A display device, characterized in that: The display device comprises the display panel according to claim 10.

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