Folding screen, display system, electronic equipment and screen brightness control method

Abstract

The embodiment of the invention provides a folding screen, a display system, electronic equipment and a screen brightness control method, the folding screen can be composed of a plurality of screens, the screens can be connected through connecting parts such as rotating shafts and hinges, and the connecting parts can be bent. The screens can be divided into a first screen and a second screen, and when the folding screen is in a specific folding state, the first screen is lightened, and the second screen is in a dark state. According to the embodiment of the invention, the cathode Vss2 is additionally arranged on the periphery of the second screen, and the newly added cathode Vss2 is connected to the anode of the OLED in the pixel of the second screen, so that the anode of the OLED is reset when the folding screen is in the specific folding state, the OLED is prevented from emitting light, and the second screen is prevented from being lighted secretly.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a folding screen, a display system, an electronic device, and a screen brightness control method. Background Art

[0002] Folding screens are increasingly used in electronic devices such as mobile phones, supporting more and more application scenarios. For example, when unfolded, multiple screens constituting the folding screen display the same picture together, forming a larger display screen, which is convenient for users to watch videos, play games, etc. For another example, in the folded state, the main screen of the multiple screens is displayed, and the second screen is in a dark state and does not display. How to control the brightness of the folding screen has always been a hot topic for technicians in this field. Summary of the invention

[0003] The embodiments of the present application provide a folding screen, a display system, an electronic device, and a screen brightness control method, which can solve the problem of screen brightness leakage when the folding screen is in a specific folding state.

[0004] In a first aspect, an embodiment of the present application provides a folding screen, the folding screen is connected to a display driving circuit DDIC, the folding screen may include a first screen and a second screen, when the folding screen is in a first folding state, the first screen is lit, and the data signal received by the second pixel unit is set to a high level, so as to control the second screen to be in a dark state; the second pixel unit is a pixel unit in the second screen;

[0005] The folding screen may further include a cathode Vss1 and a cathode Vss2, the cathodes of the light-emitting component in the first pixel unit and the light-emitting component in the second pixel unit may be connected to the cathode Vss1, and the cathode Vss1 maintains a low level; the first pixel unit is a pixel unit in the first screen; the anode of the light-emitting component in the second pixel unit may also be connected to the cathode Vss2; the DDIC may be used to control the cathode Vss2 to output a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is in the first folding state, and the DDIC may also be used to control the cathode Vss2 to stop outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is not in the first folding state.

[0006] The folding screen provided in the first aspect adds a cathode Vss2 in the second screen, and connects the newly added cathode Vss2 to the anode of the OLED in the pixel of the second screen, so as to reset the anode of the OLED when the folding screen is in the aforementioned specific folding state, thereby preventing the OLED from emitting light and thus preventing the second screen from secretly lighting up.

[0007] In combination with the first aspect, in some embodiments,Figure 5 As shown, the second screen may include a cathode Vss2 circuit, which is used to provide the cathode Vss2, and the cathode Vss2 circuit includes a multi-level cathode unit, wherein the i-th level cathode unit is connected to the anode of the light-emitting component in the i-th row of the second pixel unit, and can be used to output the low-level Vss2 signal to the anode of the light-emitting component in the i-th row of the second pixel unit.

[0008] The input end of the first (or first-stage) Vss2 unit 601 in the cathode Vss2 circuit 60 can be connected to the DDIC to receive the Vss2 signal provided by the DDIC. Not limited thereto, the input end of the first-stage Vss2 unit 601 can also be connected to other circuits to receive the Vss2 signal.

[0009] In combination with the first aspect, in some embodiments, the second screen may include a switch circuit, and the switch circuit is connected to the DDIC. Figure 6 As shown, the anode of the light-emitting component in the second pixel unit is also connected to the cathode Vss2, which may specifically include: the anode of the light-emitting component in the second pixel unit is connected to the output terminal Vss2 of the cathode circuit through the switching circuit, and the output terminal Vss2 is used to output the Vss2 signal.

[0010] exist Figure 6 In the illustrated embodiment, the DDIC is used to control the cathode Vss2 to output a low-level signal when the folding screen is in the first folding state, which may specifically include: the DDIC is used to control the switching circuit to be turned on when the folding screen is in the first folding state; the DDIC is also used to control the cathode Vss2 to stop outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is not in the first folding state, which may specifically include: the DDIC is used to control the switching circuit to be turned off when the folding screen is not in the first folding state.

[0011] In combination with the first aspect, in some embodiments, Figure 8 As shown, the switching circuit may include: a group of field effect transistors T8, a field effect transistor T9 and an inverter circuit, wherein the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, T8 is a PMOS tube, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, the gate of T8 is connected to the source of T9, the drain of T9 is connected to the output end of the inverter circuit, the input end of the inverter circuit is connected to the output end of the reset circuit of the second screen, and is used to receive the reset signal of the second screen; the reset signal is high when the folding screen is in the first folding state; the gate of T9 is connected to the DDIC.

[0012] exist Figure 8 In an embodiment, T8 may be an NMOS tube. In this way, the inverting circuit can be removed from the switching circuit. The switching circuit may include: a field effect tube T8 and a field effect tube T9, wherein T8 is an NMOS tube, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, the gate of T8 is connected to the source of T9, and the drain of T9 is connected to the output end of the reset circuit of the second screen for receiving the reset signal of the second screen; the reset signal is high when the folding screen is in the first folding state; the gate of T9 is connected to the DDIC.

[0013] exist Figure 8 In an embodiment, the DDIC is used to control the switching circuit to be turned on when the folding screen is in the first folding state, which may specifically include: the DDIC is used to control T9 to be turned on when the folding screen is in the first folding state. After T9 is turned on, the ScanX signal output by its drain to the gate of T8 is also low, and then T8 is turned on; after T8 is turned on, the low-level Vss2 is turned on to the OLED anode. In this way, the OLED anode voltage can be prevented from increasing due to the accumulation of leakage current, effectively solving the problem of the second screen secretly lighting up in the first folding state.

[0014] exist Figure 8 In an embodiment, the DDIC is used to control the switch circuit to be disconnected when the folding screen is not in the first folding state, which may specifically include: the DDIC is used to control T9 to be turned off when the folding screen is in the first folding state. After T9 is turned off, the ScanX signal output from its drain to the gate of T8 is high level, and then T8 is turned off; after T8 is turned off, the anode voltage of the OLED is not affected by the low level Vss2.

[0015] In combination with the first aspect, in some embodiments, T9 may be a PMOS transistor, in which case the first control signal may be a low level signal; T9 may also be an NMOS transistor, in which case the first control signal may be a high level signal.

[0016] In combination with the first aspect, in some embodiments, Fig.11 As shown, the switch circuit may only include: a group of field effect transistors T8, the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, and the gate of T8 is connected to the DDIC;

[0017] The DDIC is used to control the switching circuit to be turned on when the folding screen is in the first folding state, specifically including: the DDIC is used to control T8 to turn on when the folding screen is in the first folding state, so that the low-level Vss2 signal is turned on to the anode of the OLED in the pixel unit, so as to control the anode voltage of the OLED to remain at a low level, thereby avoiding the second screen from lighting up secretly.

[0018] The DDIC is used to control the switch circuit to be disconnected when the folding screen is not in the first folding state, specifically including: the DDIC is used to control T8 to be closed when the folding screen is in the first folding state, so that the anode of the OLED is not affected by the low-level Vss2 signal.

[0019] In combination with the first aspect, in some embodiments, T8 may be integrated in the second pixel unit. In the second screen, the number of field effect transistors T8 is equal to the number of pixels of the second screen.

[0020] In combination with the first aspect, in some embodiments, the voltage level of the cathode Vss1 is the same as that of the cathode Vss1, so that the voltage difference across the OLED is significantly smaller than the turn-on voltage of the OLED, thereby preventing the OLED from emitting light.

[0021] In a second aspect, an embodiment of the present application provides a screen brightness control method, which can be applied to an electronic device including a folding screen, and the method may include: the electronic device detects the folding state of the folding screen; when the folding screen is in a first folding state, the electronic device outputs a low-level Vss2 signal to the cathode Vss2 to the anode of the light-emitting component in the second pixel unit through DDIC control; when the folding screen is not in the first folding state, the electronic device stops outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit through DDIC the cathode Vss2.

[0022] The folding screen mentioned in the second aspect may be the folding screen described in any one or more embodiments of the first aspect.

[0023] In conjunction with the second aspect, in some embodiments, the second screen may include a switch circuit, the switch circuit being connected to the DDIC;

[0024] The anode of the light-emitting component in the second pixel unit is also connected to the cathode Vss2, which may specifically include: the anode of the light-emitting component in the second pixel unit is connected to the output terminal Vss2 of the cathode circuit through the switch circuit, and the output terminal Vss2 is used to output the Vss2 signal;

[0025] The electronic device outputs a low-level Vss2 signal to the cathode Vss2 and the anode of the light-emitting component in the second pixel unit through DDIC control, which may specifically include: the electronic device controls the switch circuit to be turned on through DDIC;

[0026] The electronic device stops outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit through the cathode Vss2 via DDIC, which may specifically include: the electronic device controls the switch circuit to be disconnected via DDIC.

[0027] In combination with the second aspect, in some embodiments, the electronic device controls the switching circuit to be turned on through DDIC, which may specifically include: the electronic device controls T9 to be turned on through the DDIC; the electronic device controls the switching circuit to be turned off through DDIC, which may specifically include: the electronic device controls T9 to be turned off through the DDIC.

[0028] In combination with the second aspect, in some embodiments, the switch circuit may include: a group of field effect transistors T8, the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, and the gate of T8 is connected to the DDIC;

[0029] The electronic device controls the switch circuit to be disconnected through DDIC, which may specifically include: the electronic device controls T8 to be turned on through the DDIC; the electronic device controls the switch circuit to be disconnected through DDIC, which may specifically include: the electronic device controls T8 to be turned off through the DDIC.

[0030] In a third aspect, an embodiment of the present application provides a display system, which may include a folding screen and a display driving circuit, wherein the folding screen is connected to the display driving circuit, wherein the folding screen may be the folding screen described in any one or more embodiments of the first aspect.

[0031] In a fourth aspect, an embodiment of the present application provides an electronic device, which may include: a memory, a processor, and a display system described in the third aspect of claim, wherein the memory is coupled to the processor, and the display system is coupled to the processor; wherein the memory is used to store computer program code, and the computer program code includes computer instructions, and when the processor executes the computer instructions, it executes the method described in any one or more embodiments of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0033] Figure 1 A folding screen is shown;

[0034] Figure 2 Shows Figure 1 The display structure used by the folding screen shown;

[0035] Figure 3A A pixel unit used in a display circuit is shown;

[0036] Figure 3B Shows Figure 3A A device composition of the pixel unit shown;

[0037] Figure 4A-4B A pixel unit provided by an embodiment of the present application is shown;

[0038] Figure 5 A second screen provided by an embodiment of the present application is shown;

[0039] Figure 6 Another pixel unit applied to a second screen provided by an embodiment of the present application is shown;

[0040] Figure 7 A composition of a switch circuit provided in an embodiment of the present application is shown;

[0041] Figure 8 Another second screen provided by an embodiment of the present application is shown;

[0042] Fig. 9 Another composition of another pixel unit and a switch circuit provided in an embodiment of the present application is shown;

[0043] Fig.10 Another second screen provided by an embodiment of the present application is shown;

[0044] Fig.11 Another composition of the switch circuit provided in the embodiment of the present application is shown;

[0045] Fig.12 Another second screen provided by an embodiment of the present application is shown;

[0046] Fig.13 Another second screen provided by an embodiment of the present application is shown;

[0047] Fig.14 A display system provided by an embodiment of the present application is shown;

[0048] Fig.15 An electronic device provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0049] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0050] Figure 1 A folding screen is shown. The folding screen can be composed of multiple screens, such as Figure 1 The main screen and the secondary screen shown in the figure can be connected by connecting parts such as a rotating shaft and a hinge, and can be bent at the connection. The folding screen can have multiple folding states, such as folded, unfolded, book state, and desktop state. Among them, in a specific folding state, one or more screens are lit, and another or more screens are in a dark state. The lit screen displays, and the dark screen does not display.

[0051] In the embodiment of the present application, this specific folding state can be referred to as the first folding state.

[0052] In the first folding state, the screen that is lit in the folding screen can be called the first screen, and the screen that is set to a dark state can be called the second screen. For example, when the dual-screen folding screen is in the external folding state, the main screen and the sub-screen are exposed to the outside, the main screen can be lit for display, and the sub-screen can be set to a dark state for non-display purpose. In this example, the first screen and the second screen can be the main screen and the sub-screen respectively.

[0053] Figure 1 The folding screen shown can adopt array substrate row drive (Gate On Array, GOA) technology, and GOA can realize the row-by-row scanning drive function of the display. Figure 1 In the figure, GOA represents the driving signal (Gate) output by the GOA circuit in the display screen, which may include a data hold signal and a data write control signal, wherein the data hold signal is used to control the light emitting diode in the pixel unit in the display screen to maintain the brightness, and the data write control signal is used to enable the input terminal Data of the pixel unit to receive data written by the display driver integrated circuit (DDIC). Figure 1 In FIG. 1 , Reset represents a reset control signal output to the pixel unit, and EM represents a light-emitting enable signal output to the pixel unit.

[0054] Figure 1 The folding screen shown may be an organic light-emitting diode (OLED) display, and specifically may be, for example, a low-temperature polycrystalline oxide (LTPO) display.

[0055] like Figure 1As shown, the folding screen can be connected to the mainboard side circuit through a flexible printed circuit (FPC), and the mainboard side circuit may include a DDIC, a central processor unit (CPU), and the like.

[0056] Figure 2 Shows Figure 1 The display structure used by the folding screen shown in FIG. Figure 2 As shown, the display may include: a display circuit 20 , a GOA circuit 30 , a Reset circuit 40 , and an EM circuit 50 .

[0057] The display circuit 20 may include a plurality of pixel units, such as pixel unit 211, pixel unit 212, and the like. The plurality of pixel units may be organized in rows and columns. A pixel unit may have: a drive signal input terminal (marked as Gate), a reset control signal input terminal (marked as Reset), a light-emitting enable signal input terminal (marked as EM), a data signal input terminal (marked as Data), and a reference voltage input terminal, such as Vref1 and Vref2. The drive signal input terminal (Gate) may be used for the pixel unit to receive the row scan signal Gate output by the GOA circuit 30, thereby controlling the light-emitting diode in the pixel unit to maintain brightness, and enabling the input terminal Data of the pixel unit to receive the data write of DDIC, which is reflected as the data voltage Vdata loaded on the input terminal Data. The input terminal Reset may be connected to DDIC, and may be used for the pixel unit to receive the reset signal provided by the outside (such as DDIC) and perform reset processing. The input terminal EM receives the light-emitting enable signal and controls the data signal (Data) to be transmitted to the light-emitting component OLED. The input terminal Data may be connected to DDIC, and may be used for the pixel unit to receive the data signal from DDIC and adjust the light emission of the light-emitting component. The reference voltage input terminal can be connected to the DDIC, and can be used for the pixel unit to receive a reference voltage provided by an external source (such as the DDIC), and to perform a reset process based on the reference voltage. For example, the data signal is reset according to the reset voltage of the input terminal Vref1 (also called the reset voltage Vref1), and the data signal is restored to a default value, which can generally be set to a darker brightness value. For another example, the anode voltage of the light-emitting component (such as the OLED) in the pixel unit is reset according to the reset voltage of the input terminal Vref2 (also called the reset voltage Vref2).

[0058] Wherein, the GOA circuit 30 may include a plurality of GOA units 301 (Scan1). These plurality of GOA units 301 are cascaded, and the GOA unit 301 of this stage generates a Gate signal as an input signal (STV) of the GOA unit 301 of the next stage. STV represents a frame start signal (start pulse). The Gate signal output by the i-th GOA unit 301 is 1H or 2H earlier than the Gate signal output by the i+1-th GOA unit 301. H represents the row scanning time, i.e., the time to complete a row of scanning. The Gate signal output by the i-th GOA unit 301 is also output to the input terminal Gate of the i-th row of pixel units.

[0059] The Reset circuit 40 may include a plurality of Reset units 401 (Scan2). The plurality of Reset units 401 are cascaded, and the Reset unit 401 of the current stage generates a Reset signal as an input signal of the Reset unit 401 of the next stage. The Reset signal output by the i-th Reset unit 401 is also 1H or 2H earlier than the Reset signal output by the i+1-th Reset unit 401. The Reset signal output by the i-th Reset unit 401 is also output to the input terminal Reset of the pixel unit of the i-th row.

[0060] The EM circuit 50 may include a plurality of EM units 501. The plurality of EM units 501 are also cascaded, and the EM unit 501 at the current stage generates an EM signal as an input signal of the EM unit 501 at the next stage. The EMVP signal output by the i-th EM unit 501 is also 1H or 2H earlier than the EM signal output by the i+1-th EM unit 501. The EM signal output by the i-th EM unit 501 is also output to the input terminal EM of the pixel unit in the i-th row.

[0061] Figure 2 In FIG. 1 , Scan CK / CB represents a clock signal pair supplied to the GOA circuit 30 and the Reset circuit 40. Scan CK may represent a clock signal used for odd rows, and Scan CB represents a clock signal used for even rows. EM CK / CB represents a clock signal pair supplied to the EM circuit 50. EM CK may represent a clock signal used for odd rows, and EM CB represents a clock signal used for even rows.

[0062] Figure 3A FIG. 2 shows a pixel unit used in the display circuit 20. Figure 3A As shown, the pixel unit may include: two light-emitting switch modules, two data writing modules, two anode reset modules, a driving tube and a light-emitting component OLED. The driving tube may be a field effect tube (thin film transistor, TFT). Figure 3B Shows Figure 3A A device composition of the pixel unit shown. Figure 3A The light-emitting switch module, data writing module and anode reset module shown in FIG. 1 can also be implemented by using field effect transistors (TFTs), as shown in FIG. Figure 3B As shown. Figure 3B In the figure, field effect tube T3 is a driving tube, field effect tube T2 is a data writing module, field effect tube T4 is also a data writing module, field effect tubes T5 and T6 are light-emitting control switch modules, and field effect tubes T1 and T7 are anode reset modules. The drain of field effect tube T2 is electrically connected to the input terminal Data to receive the data writing of DDIC. The control electrode (gate) of field effect tube T2 is electrically connected to the input terminal Gate to receive the data writing control signal output by GOA unit 30. The control electrode (gate) of field effect tube T4 is also electrically connected to the input terminal Gate to access the row scanning signal Gate output by GOA unit 30. The control electrodes of field effect tubes T1 and T7 are electrically connected to the reset control terminal Reset to receive the reset control signal Reset, and their sources are connected to the input terminals Vref1 and Vref2 to access the reference voltage provided externally.

[0063] The voltages of the reset signal Reset and the data signal Data will affect the brightness of the light-emitting component OLED. Generally, the light emission of the OLED can be adjusted by adjusting their voltages, thereby controlling the display brightness of the screen.

[0064] Figure 3A-3B Vdd and Vss1 can represent the positive electrode (or anode) and the negative electrode (or cathode) respectively. Among them, Vss1 is connected to the cathode of OLED, and Vss1 is the cathode shared by the entire folding screen, that is, the common cathode. The pixel units of each screen of the folding screen use the same cathode.

[0065] In order to control the second screen to be in a dark state, one solution is to set the Gate signal, EM signal, and Reset signal of the pixel unit of the second screen to a high level to turn off the corresponding TFT, and set the Data signal to a high potential VGMP, so that its potential is equal to or close to Vdd, thereby controlling the potential of point N2 to be low, the OLED does not emit light, and finally the second screen is in a dark state. VGMP is the Data voltage when the screen is in a dark state (or a pure black background) after being lit, which is a source drive high level. Here, the TFTs turned off by the input terminal Gate being set to a high level are T2 and T4, the TFT turned off by the input terminal EM being set to a high level is T6, the TFT turned off by the input terminal Reset1 being set to a high level is T1, and the TFT turned off by the Reset2 being set to a high level is T7. In addition, the Data signal is set to a high potential VGMP, so that its potential is equal to or close to Vdd, thereby controlling the potential of point N2 to be low.

[0066] In the above scheme, if T1, T2, T4, T6, and T7 are turned off for a long time, it will cause the screen to have a residual image problem. To this end, another scheme is that the Gate, EM, and Reset of the pixel unit of the second screen are switched between high and low levels, so that these TFTs are dynamically switched between off and on, and these TFTs are prevented from being in a closed state for a long time to solve the residual image problem. When Gate, EM, and Reset are switched between high and low levels, the Data signal is set to a high potential VGMP, so that its potential is equal to or close to Vdd, thereby controlling the potential of point N2 to be low, the OLED does not emit light, and finally the screen is controlled to be in a dark state. Moreover, in order to reduce power consumption, the duration of Gate, EM, and Reset at a low level is longer than that at a high level.

[0067] However, in the above two solutions, when the second screen is controlled to be in a dark state, leakage current will accumulate in the path from T5 to T3 to T6 and from T2 to T3 to T6 in the pixel unit of the second screen, causing the potential of point N2 to gradually increase, and the voltage difference between point N2 and Vss1 is close to the turn-on voltage (or light-emitting voltage) of the OLED, so the OLED emits light and the second screen lights up. This problem can also be called "the second screen is bright". However, Vss1 is a common cathode, and the potential of Vss1 cannot be raised to consider the problem of the second screen being bright, because this will affect the normal operation of the first screen.

[0068] In order to solve the problem of the second screen stealing light when the folding screen is in a folded state, an embodiment of the present application provides a folding screen, adds a cathode Vss2 on the periphery of the second screen, and connects the newly added cathode Vss2 to the anode of the OLED in the pixel of the second screen, so as to reset the anode of the OLED when the folding screen is in the aforementioned specific folding state, thereby preventing the OLED from emitting light and thus preventing the second screen from stealing light.

[0069] Figure 4A-4B A pixel unit provided in an embodiment of the present application is shown. The pixel unit can be applied to the second screen of a folding screen. Figure 4A and Figure 4B As shown, the pixel unit may include an input terminal Vss2 and be connected to the anode of the OLED. When the input signal received by the input terminal Vss2 is a low-level signal, such as a low-level signal as low as Vss1, the anode potential of the OLED (the potential at point N2) is also low, and will not increase due to the accumulation of leakage current in the light-emitting switch module. At this time, the input terminal Vss2 may be equivalent to the newly added cathode Vss2 of the pixel unit. When the input signal received by the input terminal Vss2 is not a low-level signal, the anode voltage of the OLED is no longer affected by Vss2, and the light emission of the OLED returns to the control of the light-emitting switch module and the data writing module.

[0070] Figure 5 A second screen provided by an embodiment of the present application is shown, and the pixel units in the second screen can be as follows Figure 4A and Figure 4B The second screen is connected to the DDIC. Figure 5 As shown, in Figure 2 Based on the display structure shown in FIG. 1 , a Vss2 input terminal is added to the pixel unit in the second screen, and the Vss2 input terminal can be connected to the anode of the OLED. Figure 5 As shown, the display may further include: a cathode Vss2 circuit 60. The cathode Vss2 circuit 60 may include a plurality of cathode Vss2 units 601, and the plurality of cathode Vss2 units 601 are cascaded, and the Vss2 unit 601 of the current stage generates a Vss2 signal as an input signal of the Vss2 unit 601 of the next stage. The Vss2 signal output by the i-th Vss2 unit 601 is 1H or 2H earlier than the Vss2 signal output by the i+1-th Vss2 unit 601. The Vss2 signal output by the i-th Vss2 unit 601 is also output to the Vss2 input terminal of the i-th row of pixel units. The input terminal of the first (or first-stage) Vss2 unit 601 in the cathode Vss2 circuit 60 may be connected to a DDIC to receive a Vss2 signal provided by the DDIC. Not limited thereto, the input terminal of the first-stage Vss2 unit 601 may also be connected to other circuits to receive a Vss2 signal.

[0071] Based on including Figure 5 The folding screen of the second screen shown in the embodiment of the present application also provides a screen brightness control method, which may include the following steps: when the folding screen is in a first folding state, the DDIC can be controlled to output a low-level Vss2 signal to the Vss2 input terminal of the pixel unit in the second screen, that is, to output a low-level Vss2 signal to the cathode Vss2 circuit 60; when the folding screen is not in the first folding state, the DDIC can be controlled not to output a low-level Vss2 signal to the pixel unit in the second screen.

[0072] Figure 6 Another pixel unit applied to a second screen provided in an embodiment of the present application is shown.

[0073] like Figure 6 As shown, in the pixel unit, the anode of the OLED can be connected to the cathode Vss2 through the switch circuit 70. The DDIC can be connected to the switch circuit 70 to output a control signal Ctr l to the switch circuit 70 to control the switch circuit 70 to be turned on or off, thereby controlling whether the low-level Vss2 signal is transmitted to the anode of the OLED.

[0074] Specifically, DDIC can control the switch circuit 70 to be turned on, thereby controlling the low-level Vss2 signal to be transmitted to the anode of the OLED. DDIC can also control the switch circuit 70 to be turned off, thereby controlling the low-level Vss2 signal not to be transmitted to the anode of the OLED, so that the anode voltage of the OLED is not affected by Vss2.

[0075] Figure 6 In the embodiment, the Vss2 signal can be provided by the DDIC or other circuits.

[0076] Figure 7 FIG. 8 shows a device composition of a switch circuit 70. Figure 7 As shown, the switch circuit 70 may include: a field effect transistor T8, a field effect transistor T9 and an inverter circuit, wherein the source of T8 is connected to the anode of the OLED, the drain of T8 is connected to Vss2, the gate of T8 is connected to the source of T9, the drain of T9 is connected to the output end of the inverter circuit, and the input end of the inverter circuit is connected to Reset2. The gate of T9 is connected to DDIC to receive the control signal Ctr l output by DDIC. The signal input to the gate of T8 can be marked as ScanX. When ScanX is at a high level, T8 is turned off; when ScanX is at a low level, T8 is turned on.

[0077] Table 1 shows the level timing of the Reset2 signal, the output signal of the inverting circuit, the Ctr 1 signal, and the ScanX signal, and the corresponding switching state of T8.

[0078] Table 1

[0079]

[0080]

[0081] As shown in Table 1, when the folding screen is in the first folding state, the Reset2 signal is high, can be maintained at a high level, and is input to the inverting circuit; the inverting circuit inverts its input signal and outputs a low-level signal, which is input to the source of T9; at this time, the low-level Ctrl signal output by DDIC turns on T9; after T9 is turned on, the ScanX signal output by its drain to the gate of T8 is also low, which then turns on T8; after T8 is turned on, the low-level Vss2 is turned on to the OLED anode. In this way, the OLED anode voltage can be prevented from increasing due to the accumulation of leakage current, effectively solving the problem of the second screen being bright in the first folding state.

[0082] As shown in Table 1, when the folding screen is not in the first folding state (other folding states), for example, when the entire screen is fully lit, the Reset2 signal can be high, can be maintained at a high level, and is input to the inverting circuit; the inverting circuit inverts its input signal and outputs a low-level signal, which is input to the source of T9; for another example, when the entire screen is off and in a dark state, the Reset2 signal can be low, and after being inverted by the inverting circuit, a high-level signal is output, which is input to the source of T9. At this time, the high-level Ctrl signal output by the DDIC turns off T9; after T9 is turned off, the ScanX signal output by its drain to the gate of T8 is high, and then turns off T8; after T8 is turned off, the anode voltage of the OLED is not affected by the low-level Vss2.

[0083] Figure 7 In the pixel unit shown, T8 is a PMOS type field effect transistor. However, it is not limited thereto, T8 can also be an NMOS type field effect transistor, in which case the inverter circuit in the switch circuit 70 can be removed.

[0084] Figure 8 Another second screen provided by an embodiment of the present application is shown. The pixel units in the second screen can be as follows Figure 7 As shown. The second screen is connected to the DDIC.

[0085] like Figure 8 As shown, in Figure 5 Based on the display structure shown, the second screen further adds a switch circuit 70. The switch circuit 70 may include: an inverter circuit, a field effect transistor T9 and a group of field effect transistors T8, the number of which may be equal to the number of pixel rows in the second screen.

[0086] Among them, the gate of T8 corresponding to each row of pixels is connected to the source of T9, and the signal output from the source of T9 to the gate of T8 is marked as ScanX; the drain of T8 corresponding to the i-th row of pixels is connected to the output end of the i-th level Vss2 unit 601, which is used to receive the Vss2 signal output by the i-th level Vss2 unit; the source of T8 corresponding to the i-th row of pixels is connected to the Vss2 input end of each pixel unit in the i-th row of pixels.

[0087] Among them, the gate of T9 is connected to DDIC to receive the control signal Ctrl output by DDIC; the drain of T9 is connected to the output end of the inverter circuit, and the input end of the inverter circuit is connected to the reset signal Reset of the second screen, that is, the aforementioned Reset2.

[0088] Based on including Figure 8The folding screen of the second screen shown, the embodiment of the present application also provides a screen brightness control method, which may include the following steps: when the folding screen is in the first folding state, in order to control the second screen to be in a dark state, the Reset circuit 40 can be controlled to output a high-level reset signal Reset. The high-level Reset signal is output as a low-level signal after passing through the inverting circuit. When the folding screen is in the first folding state, the DDIC can be controlled to output a first control signal, such as a low-level Ctrl signal, to turn on T9, and output the low-level signal output by the inverting circuit to the gate of T8 to turn on T8, and then conduct the low-level Vss2 signal to the anode of the OLED of each pixel in the second screen to control the anode voltage of the OLED to remain at a low level to avoid the second screen from being secretly bright.

[0089] T9 may be a PMOS transistor, in which case the first control signal may be a low level signal; T9 may also be an NMOS transistor, in which case the first control signal may be a high level signal.

[0090] When the folding screen is not in the first folding state, the DDIC can be controlled to output a second control signal, such as a high-level Ctrl signal, to turn off T9 and then turn off T8, so that the low-level Vss2 provided by the cathode Vss2 circuit 60 will not be input to the anode of the OLED of the second screen pixel, and will not affect the normal operation of the second screen in other folding states.

[0091] In some embodiments, Fig. 9 As shown, T8 can also be integrated into the pixel unit. The number of field effect transistors T8 is equal to the number of pixels of the second screen. Among them, the source of T8 is connected to the anode of the OLED; the drain of T8 is used as the Vss2 input terminal of the pixel unit, which can be used to receive the Vss2 signal, for example, the drain of T8 is connected to the output terminal of the Vss2 signal of the DDIC to receive the Vss2 signal output by the DDIC; the gate of T8 is used as the ScanX input terminal of the pixel unit, for example, the gate of T8 is connected to the output terminal of the ScanX signal of the switch circuit 70, which is used to receive the ScanX signal output by the switch circuit 70. In this way, T8 is no longer a component of the switch circuit 70, and the switch circuit 80 can be composed only of the inverter circuit and the field effect transistor T9. Of course, it can also be considered that T8 is a part of the switch circuit 70 in terms of function.

[0092] When the ScanX signal received at the ScanX input terminal is at a low level, T8 is turned on, and the low-level Vss2 signal input from the Vss2 input terminal can be conducted to the OLED anode, pulling down the OLED anode voltage. When the ScanX signal received at the ScanX input terminal is at a high level, T8 is disconnected, and the low-level Vss2 signal input from the Vss2 input terminal cannot be conducted to the OLED anode. In other words, at this time, the OLED anode voltage is not affected by the Vss2 signal.

[0093] Fig. 9 In the pixel unit shown, T8 is a PMOS type field effect transistor. However, it is not limited thereto, T8 can also be an NMOS type field effect transistor, in which case the inverter circuit in the switch circuit 70 can be removed.

[0094] Fig.10 Another second screen provided by an embodiment of the present application is shown. The pixel units in the second screen can be as follows Fig. 9 As shown, T8 is integrated. The second screen is connected to DDIC.

[0095] like Fig.10 As shown, each pixel in the second screen can integrate a field effect transistor T8, and the pixel unit adds a ScanX input terminal, which can be provided by the gate of T8 in the pixel unit.

[0096] Among them, the ScanX input end of each pixel is connected to the source of T9 to receive the ScanX signal; the Vss2 input end of the i-th row pixel is connected to the output end of the i-th level Vss2 unit 601 to receive the Vss2 signal output by the i-th level Vss2 unit.

[0097] Among them, the gate of T9 is connected to DDIC to receive the control signal Ctr l output by DDIC; the drain of T9 is connected to the output end of the inverter circuit, and the input end of the inverter circuit is connected to the reset signal Reset of the second screen, that is, the aforementioned Reset2.

[0098] Based on including Fig.10The folding screen of the second screen shown, the screen brightness control method provided in the embodiment of the present application may include the following steps: when the folding screen is in the first folding state, in order to control the second screen to be in a dark state, the Reset circuit 40 may be controlled to output a high-level reset signal Reset. The high-level Reset signal is output as a low-level signal after passing through the inverting circuit. When the folding screen is in the first folding state, the DDIC may be controlled to output a first control signal, such as a low-level Ctr l signal, to turn on T9, and output the low-level signal output by the inverting circuit to the ScanX input terminal of the pixel unit, so as to conduct the low-level Vss2 signal to the anode of the OLED of each pixel in the second screen, so as to control the anode voltage of the OLED to remain at a low level, so as to avoid the second screen from being bright.

[0099] When the folding screen is not in the first folding state, the DDIC can be controlled to output a second control signal, such as a high-level Ctrl signal, to turn off T9, so that the ScanX input end of the pixel unit does not output a low-level signal, thereby preventing the anode of the OLED from being affected by the Vss2 signal.

[0100] In some embodiments, Fig.11 As shown, the switch circuit 70 may only include a field effect transistor T8, the source of T8 is connected to the anode of the OLED, the drain of T8 is used as the Vss2 input terminal, and the gate of T8 is used as the ScanX input terminal and connected to the ScanX output terminal of the DDIC.

[0101] Fig.12 Another second screen provided by an embodiment of the present application is shown. The pixel units in the second screen can be as follows Fig.11 As shown, T8 is integrated, and the ScanX input of the pixel unit can be provided by the gate of T8. The second screen is connected to DDIC.

[0102] and Fig.10 The difference is, Fig.12 In the second screen shown, the ScanX input terminal of the pixel unit can be directly connected to the ScanX output terminal of the DDIC to receive the ScanX signal output by the DDIC. When the folding screen is in the first folding state, the DDIC can output a low-level ScanX signal to control T8 in the pixel unit to turn on, so that the low-level Vss2 signal is conducted to the anode of the OLED in the pixel unit to control the anode voltage of the OLED to remain at a low level to avoid the second screen from lighting up. When the folding screen is not in the first folding state, the DDIC does not output a low-level ScanX signal to control T8 in the pixel unit to turn off, so that the anode of the OLED is not affected by the low-level Vss2 signal.

[0103] Not limited to Fig.12As shown, T8 may not be integrated in the pixel unit, but each row of pixel units may share one T8, which can be referred to Fig.13 .exist Fig.13 In the illustrated embodiment, the pixel unit no longer has a ScanX input terminal, and each row of pixels can share one T8. The source of T8 corresponding to the i-th row of pixels is connected to the Vss2 input terminal of each pixel unit in the i-th row of pixels, and the drain of T8 corresponding to the i-th row of pixels is connected to the output terminal of the i-th level Vss2 unit 601, for receiving the Vss2 signal output by the i-th level Vss2 unit; the gate of T8 corresponding to the i-th row of pixels can be connected to the ScanX output terminal of the DDIC.

[0104] Based on including Fig.13 The folding screen of the second screen shown, the embodiment of the present application also provides a screen brightness control method, which may include the following steps: when the folding screen is in the first folding state, the DDIC may output a low-level ScanX signal to control the T8 corresponding to each row of pixel units to turn on, so that the low-level Vss2 signal is conducted to the anode of the OLED in the pixel unit, so as to control the anode voltage of the OLED to remain at a low level, and avoid the second screen from being bright. When the folding screen is not in the first folding state, the DDIC does not output a low-level ScanX signal to control the T8 corresponding to each row of pixel units to turn off, so that the anode of the OLED in the pixel unit is not affected by the low-level Vss2 signal.

[0105] To simplify the diagram, Figure 5 , Figure 8 , Fig.10 , Fig.12 , Fig.13 The clock signal pair Scan CK / CB supplied to the GOA circuit 30 and the Reset circuit 40 and the clock signal pair EM CK / CB supplied to the EM circuit 50 in the screen are not shown.

[0106] The display control method provided in this embodiment can be executed by a display system including a folding screen and a DDIC, or by an electronic device including a folding screen and a DDIC.

[0107] Fig.14 FIG. 6 shows a display system 60 provided in an embodiment of the present application. Fig.14 As shown, the display system 60 may include: a folding screen 61 and a display driving circuit 62.

[0108] The folding screen 61 may include multiple screens. These screens may be organic light emitting diode (OLED) display panels, wherein each pixel unit includes an OLED. The folding screen 61 may include Figure 5 , Figure 8 , Fig.10 , Fig.12 or Fig.13 The second screen of the embodiment description.

[0109] The display driving circuit 62 may include a display driving circuit, such as a DDIC, for controlling and driving the folding screen 61 for display, and its main function is to send driving signals and data to the folding screen 61 in the form of electrical signals, and to display image information on the folding screen 61 by controlling the brightness and color. The display driving circuit 62 may also include a circuit portion for timing control, such as a timing controller (TCON). The timing controller may set the timing of the control signal and the data signal, and transmit the control signal and the data signal to the display driving circuit according to the timing.

[0110] A storage unit may also be provided in the display driving circuit 62 to store code instructions of the screen brightness control method provided in the embodiment of the present application. When the code instructions are reread from the storage unit and run, the display system 60 may execute the method.

[0111] The display driver circuit 62 can be implemented by hardware, software, or a combination of hardware and software, and can be implemented by, for example, a digital logic circuit and a register that perform the functions described in the aforementioned various method embodiments. The display driver circuit 62 can be implemented as one or more chips. When it is implemented as one chip, its various functions are integrated into this chip; when it is implemented as multiple chips, such as a chip system, its various functions can be separately integrated into different independent chips.

[0112] Fig.15 An electronic device 100 provided in an embodiment of the present application is shown.

[0113] In the embodiment of the present application, the device type of the electronic device 100 can be a mobile phone, a tablet computer, a handheld computer, a desktop computer, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (PDA), as well as smart home devices such as smart large screens and smart speakers, wearable devices such as smart bracelets, smart watches, and smart glasses, extended reality (extended reality, XR) devices such as augmented reality (AR), virtual reality (VR), and mixed reality (MR), vehicle-mounted devices or smart city devices, and the like.

[0114] like Fig.15As shown, the electronic device 100 may include: a processor 110, a memory 120, a display screen 130, a display driver integrated circuit (DDIC) 140, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, and a subscriber identification module (SIM) card interface 195, etc. Among them, the sensor module 180 may include a gyroscope sensor 180B, an acceleration sensor 180E, and a touch sensor 180K, etc. The various components in the electronic device 100 may be connected through a bus.

[0115] The processor 110 may be one or more, and they may be integrated into an integrated circuit of a system on chip (SOC). SOC is a system-on-chip. The processor 110 may include a central processing unit (CPU), a graphics processing unit (GPU), and a display driver integrated circuit (DDIC). The CPU may be an application processor (AP). The CPU and GPU may be used to render and synthesize images to be sent to the display screen 130. The processor 110 may also include a neural-network processing unit (NPU), a modem processor, and the like.

[0116] The processor 110 may include one or more interfaces, such as an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general purpose input and output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0117] The processor 110 may be provided with a cache memory for storing instructions or data just used or cyclically used by the processor 110. If the processor 110 needs to use the instruction or data again, it can be directly called from the cache memory, which can reduce the waiting time of the processor 110 and improve the program running efficiency.

[0118] The memory 120 may include a program storage area and a user data storage area, wherein the program storage area may store an operating system and one or more application programs (such as game applications), and the data storage area may store data (such as photos, contacts) created by the user when using the electronic device 100. The memory 120 may be a high-speed random access memory or a non-volatile memory, such as a disk, a flash memory, a universal flash storage (UFS), etc. The memory 120 may also be an external memory card, such as a Micro SD card.

[0119] The memory 120 may also store code instructions of the screen brightness control method provided in the embodiment of the present application. When the processor 110 reads the code instructions from the memory 120 and runs the code instructions, the electronic device 100 can execute the method.

[0120] The memory 120 may also be integrated with the processor 110 in an integrated circuit of a SOC.

[0121] The electronic device 100 can realize a display function through the SOC, the DDIC 140 , and the display screen 130 .

[0122] The display screen 130 may be a folding screen, and may be the display 10 described in the above embodiment. The folding screen may be composed of multiple screens, such as Figure 1 The main screen and the secondary screen shown in the figure can be connected by connecting parts such as a rotating shaft and a hinge, and can be bent at the connection. The folding screen can have a specific folding state, that is, the aforementioned first folding state. In this specific folding state, one or several screens are lit, and another or several screens are in a dark state. The lit screen displays, and the dark screen does not display. In the first folding state, the lit screen in the folding screen can be called the first screen, and the screen set to the dark state can be called the second screen.

[0123] Among them, the display driver integrated circuit (DDIC) 140 can be used as the control core of the display screen 130, driving the display screen 130 to work, and receiving data from the SOC (processor 110), such as image data and some instructions. The DDIC 140 can send driving signals and data to the display panel of the display screen 130 in the form of electrical signals, and then realize the control of the screen brightness and color, so that image information such as letters and pictures can be displayed on the screen, completing the screen refresh.

[0124] The image data of the screen to be displayed sent by the SOC to the DDIC 140 can be sent to the frame buffer for storage to complete the display (or image sending). Then, the DDIC 140 takes out the image data from the frame buffer and drives the display screen 130 to display.

[0125] The wireless communication function of the electronic device 100 can be implemented through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor and the baseband processor.

[0126] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of antennas. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0127] The mobile communication module 150 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc., applied to the electronic device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the same device as at least some of the modules of the processor 110.

[0128] The modem processor may include a modulator and a demodulator. Among them, the modulator is used to modulate the low-frequency baseband signal to be sent into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After the low-frequency baseband signal is processed by the baseband processor, it is passed to the application processor. The application processor outputs a sound signal through an audio device (not limited to a speaker 170A, a receiver 170B, etc.), or displays an image or video through a display screen 130. In some embodiments, the modem processor may be an independent device. In other embodiments, the modem processor may be independent of the processor 110 and be set in the same device as the mobile communication module 150 or other functional modules.

[0129] The wireless communication module 160 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc., which are applied to the electronic device 100. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the processor 110. The wireless communication module 160 can also receive the signal to be sent from the processor 110, modulate the frequency of it, amplify it, and convert it into electromagnetic waves for radiation through the antenna 2.

[0130] In some embodiments, the antenna 1 of the electronic device 100 is coupled to the mobile communication module 150, and the antenna 2 is coupled to the wireless communication module 160, so that the electronic device 100 can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technology. The GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a Beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS) and / or a satellite based augmentation system (SBAS).

[0131] The electronic device 100 can realize the shooting function through ISP, camera 193, video codec, GPU, display screen 130 and application processor.

[0132] ISP is used to process the data fed back by camera 193. For example, when taking a photo, the shutter is opened, and the light is transmitted to the camera photosensitive element through the lens. The light signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to ISP for processing and converts it into an image visible to the naked eye. ISP can also perform algorithm optimization on the noise, brightness, and color of the image. ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, ISP can be set in camera 193.

[0133] The camera 193 is used to capture still images or videos. The object generates an optical image through the lens and projects it onto the photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) photoelectric field effect tube. The photosensitive element converts the optical signal into an electrical signal, and then transmits the electrical signal to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV or other format. In some embodiments, the electronic device 100 may include 1 or N cameras 193, where N is a positive integer greater than 1.

[0134] The digital signal processor is used to process digital signals, and can process not only digital image signals but also other digital signals. For example, when the electronic device 100 is selecting a frequency point, the digital signal processor is used to perform Fourier transform on the frequency point energy.

[0135] Video codecs are used to compress or decompress digital videos. The electronic device 100 may support one or more video codecs. Thus, the electronic device 100 may play or record videos in a variety of coding formats, such as Moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

[0136] NPU is a neural network (NN) computing processor. By drawing on the structure of biological neural networks, such as the transmission mode between neurons in the human brain, it can quickly process input information and can also continuously self-learn. Through NPU, applications such as intelligent cognition of electronic device 100 can be realized, such as image recognition, face recognition, voice recognition, text understanding, etc.

[0137] The electronic device 100 can implement audio functions such as music playing and recording through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone jack 170D, and the application processor.

[0138] The audio module 170 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 170 can also be used to encode and decode audio signals. In some embodiments, the audio module 170 can be arranged in the processor 110, or some functional modules of the audio module 170 can be arranged in the processor 110.

[0139] The speaker 170A, also called a "speaker", is used to convert an audio electrical signal into a sound signal. The electronic device 100 can listen to music or listen to a hands-free call through the speaker 170A.

[0140] The receiver 170B, also called a "earpiece", is used to convert audio electrical signals into sound signals. When the electronic device 100 receives a call or voice message, the voice can be received by placing the receiver 170B close to the human ear.

[0141] Microphone 170C, also called "microphone" or "microphone", is used to convert sound signals into electrical signals. When making a call or sending a voice message, the user can speak by putting their mouth close to microphone 170C to input the sound signal into microphone 170C. The electronic device 100 can be provided with at least one microphone 170C. In other embodiments, the electronic device 100 can be provided with two microphones 170C, which can not only collect sound signals but also realize noise reduction function. In other embodiments, the electronic device 100 can also be provided with three, four or more microphones 170C to collect sound signals, reduce noise, identify the sound source, realize directional recording function, etc.

[0142] The earphone interface 170D is used to connect a wired earphone and can be a USB interface, or a 3.5 mm open mobile terminal platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface.

[0143] The button 190 includes a power button, a volume button, etc. The button 190 may be a mechanical button. It may also be a touch button. The electronic device 100 may receive a button input and generate a key signal input related to the user settings and function control of the electronic device 100. The motor 191 may generate a vibration prompt. The SIM card interface 195 is used to connect a SIM card. The SIM card may be connected to or disconnected from the electronic device 100 by inserting the SIM card interface 195 or pulling the SIM card interface 195 out.

[0144] Fig.15 The illustrated structure does not constitute a specific limitation on the electronic device 100. The electronic device 100 may include more or fewer components than shown in the figure, or combine some components, or separate some components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0145] The steps of the method or algorithm described in conjunction with the disclosure of the embodiments of the present application can be implemented in a hardware manner, or can be implemented by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (Erasable ProgrammableROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM), registers, hard disks, mobile hard disks, read-only compact disks (CD-ROMs) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a transceiver or a relay device. Of course, the processor and the storage medium can also be present in a wireless access network device or a user device as discrete components.

[0146] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0147] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A folding screen, characterized in that: The folding screen is connected to a display driving circuit DDIC, and the folding screen includes a first screen and a second screen. When the folding screen is in a first folding state, the first screen is lit, and the data signal received by the second pixel unit is set to a high level, so as to control the second screen to be in a dark state; the second pixel unit is a pixel unit in the second screen; The folding screen also includes a cathode Vss1 and a cathode Vss2, the cathodes of the light-emitting component in the first pixel unit and the light-emitting component in the second pixel unit are both connected to the cathode Vss1, and the cathode Vss1 maintains a low level; the first pixel unit is a pixel unit in the first screen; the anode of the light-emitting component in the second pixel unit is also connected to the cathode Vss2; the DDIC is used to control the cathode Vss2 to output a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is in the first folding state, and is also used to control the cathode Vss2 to stop outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is not in the first folding state.

2. The folding screen according to claim 1, characterized in that: The second screen also includes a cathode Vss2 circuit, which is used to provide the cathode Vss2, and the cathode Vss2 circuit includes a multi-level cathode unit, wherein the i-th level cathode unit is connected to the anode of the light-emitting component in the second pixel unit in the i-th row, and is used to output the low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit in the i-th row.

3. The folding screen according to claim 2, characterized in that: The second screen includes a switch circuit, and the switch circuit is connected to the DDIC; The anode of the light-emitting component in the second pixel unit is also connected to the cathode Vss2, specifically comprising: the anode of the light-emitting component in the second pixel unit is connected to the output terminal Vss2 of the cathode circuit through the switch circuit, and the output terminal Vss2 is used to output the Vss2 signal; The DDIC is used to control the cathode Vss2 to output a low level signal when the folding screen is in the first folding state, specifically including: the DDIC is used to control the switch circuit to be turned on when the folding screen is in the first folding state; It is also used to control the cathode Vss2 to stop outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit when the folding screen is not in the first folding state, specifically including: the DDIC is used to control the switching circuit to be disconnected when the folding screen is not in the first folding state.

4. The folding screen according to claim 3, characterized in that: The switching circuit includes: a group of field effect transistors T8, a field effect transistor T9 and an inverter circuit, wherein the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, T8 is a PMOS tube, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, the gate of T8 is connected to the source of T9, the drain of T9 is connected to the output end of the inverter circuit, the input end of the inverter circuit is connected to the output end of the reset circuit of the second screen, and is used to receive the reset signal of the second screen; the reset signal is at a high level when the folding screen is in the first folding state; the gate of T9 is connected to the DDIC.

5. The folding screen according to claim 3, characterized in that: The switching circuit includes: a field effect transistor T8 and a field effect transistor T9, wherein T8 is an NMOS transistor, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, the gate of T8 is connected to the source of T9, and the drain of T9 is connected to the output end of the reset circuit of the second screen for receiving a reset signal of the second screen; the reset signal is at a high level when the folding screen is in the first folding state; the gate of T9 is connected to the DDIC.

6. The folding screen according to claim 4 or 5, characterized in that: The DDIC is used to control the switch circuit to be turned on when the folding screen is in the first folding state, specifically including: the DDIC is used to control T9 to be turned on when the folding screen is in the first folding state; The DDIC is used to control the switch circuit to be disconnected when the folding screen is not in the first folding state, specifically including: the DDIC is used to control T9 to be closed when the folding screen is in the first folding state.

7. The folding screen according to claim 6, characterized in that: T9 is a PMOS transistor, and the first control signal is a low-level signal; or, T9 is an NMOS transistor, and the first control signal is a high-level signal.

8. The folding screen according to claim 3, characterized in that: The switch circuit includes: a group of field effect transistors T8, the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, and the gate of T8 is connected to the DDIC; The DDIC is used to control the switch circuit to be turned on when the folding screen is in the first folding state, specifically including: the DDIC is used to control T8 to be turned on when the folding screen is in the first folding state; The DDIC is used to control the switch circuit to be disconnected when the folding screen is not in the first folding state, specifically including: the DDIC is used to control T8 to be turned off when the folding screen is in the first folding state.

9. The folding screen according to any one of claims 4 to 8, characterized in that: The number of the group of field effect transistors T8 is equal to the number of pixels of the second screen, and T8 is integrated in the second pixel unit.

10. The folding screen according to any one of claims 1 to 9, characterized in that: The cathode Vss1 has the same level as the cathode Vss1.

11. A screen brightness control method, characterized in that: The method is applied to an electronic device including a folding screen, the folding screen is connected to a display driving circuit DDIC, the folding screen includes a first screen and a second screen, when the folding screen is in a first folding state, the first screen is lit, and the data signal received by the second pixel unit is set to a high level, so as to control the second screen to be in a dark state; the second pixel unit is a pixel unit in the second screen; The folding screen further includes a cathode Vss1 and a cathode Vss2, the cathodes of the light-emitting component in the first pixel unit and the light-emitting component in the second pixel unit are both connected to the cathode Vss1, and the cathode Vss1 maintains a low level; the first pixel unit is a pixel unit in the first screen; The anode of the light emitting component in the second pixel unit is also connected to the cathode Vss2; include: The electronic device detects a folding state of the folding screen; When the folding screen is in the first folding state, the electronic device outputs a low-level Vss2 signal to the cathode Vss2 and to the anode of the light-emitting component in the second pixel unit through DDIC control; When the folding screen is not in the first folding state, the electronic device stops outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit through DDIC the cathode Vss2.

12. The method according to claim 11, characterized in that The folding screen is the folding screen as described in claim 2.

13. The method according to claim 12, characterized in that The second screen includes a switch circuit, and the switch circuit is connected to the DDIC; The anode of the light-emitting component in the second pixel unit is also connected to the cathode Vss2, specifically comprising: the anode of the light-emitting component in the second pixel unit is connected to the output terminal Vss2 of the cathode circuit through the switch circuit, and the output terminal Vss2 is used to output the Vss2 signal; The electronic device outputs a low-level Vss2 signal to the cathode Vss2 and the anode of the light-emitting component in the second pixel unit through DDIC control, specifically including: the electronic device controls the switch circuit to be turned on through DDIC; The electronic device stops outputting the Vss2 signal to the anode of the light-emitting component in the second pixel unit through the cathode Vss2 via DDIC, which specifically includes: the electronic device controls the switch circuit to be disconnected via DDIC.

14. The method according to claim 13, characterized in that The folding screen is the folding screen described in claim 4.

15. The method according to claim 13, characterized in that The folding screen is the folding screen described in claim 5.

16. The method according to claim 14 or 15, characterized in that The electronic device controls the switch circuit to be turned on through the DDIC, specifically including: the electronic device controls T9 to be turned on through the DDIC; The electronic device controls the switch circuit to be disconnected through the DDIC, which specifically includes: the electronic device controls T9 to be turned off through the DDIC.

17. The method according to claim 16, characterized in that The folding screen is the folding screen as described in claim 7.

18. The method according to claim 13, characterized in that The switch circuit includes: a group of field effect transistors T8, the number of the group of field effect transistors T8 is equal to the number of pixel rows of the second screen, the source of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 is connected to the cathode Vss2, and the gate of T8 is connected to the DDIC; The electronic device controls the switch circuit to be disconnected through the DDIC, specifically comprising: the electronic device controls T8 to be turned on through the DDIC; The electronic device controls the switch circuit to be disconnected through the DDIC, specifically including: the electronic device controls T8 to be turned off through the DDIC.

19. The method according to any one of claims 14 to 18, characterized in that The folding screen is the folding screen described in claim 9.

20. The method according to any one of claims 11 to 19, characterized in that The folding screen is the folding screen described in claim 9.

21. A display system, characterized in that: The display system includes a folding screen and a display driving circuit, and the folding screen is connected to the display driving circuit, wherein the folding screen is the folding screen described in any one of claims 1-10.

22. An electronic device, characterized in that: The electronic device comprises: a memory, a processor and the display system as described in claim 21, the memory is coupled to the processor, and the display system is coupled to the processor; wherein the memory is used to store computer program code, and the computer program code comprises computer instructions, and when the processor executes the computer instructions, the method as described in any one of claims 11-20 is executed.

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