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

Abstract

Embodiments of the present application provide a folding screen, a display system, an electronic device and a screen brightness control method. The folding screen can be composed of multiple screens. The screens can be connected by a rotating shaft, a hinge or other connecting components, and can be bent at the connection. The multiple screens can be divided into a first screen and a second screen. When the folding screen is in a specific folding state, the first screen is lit, and the second screen is in a dark state. Embodiments of the present application add a cathode Vss2 to the periphery of the second screen, and connect the 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 specific folding state, avoid the OLED emitting light, and thus avoid the second screen from being lit.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to foldable screens, display systems, electronic devices, and screen brightness control methods. Background Technology

[0002] Foldable screens are increasingly widely used in mobile phones and other electronic devices, supporting a wider range of application scenarios. For example, when unfolded, multiple screens that make up a foldable screen can display the same image, forming a larger display for users to watch videos, play games, and so on. Another example is when folded, the main screen displays the image while the secondary screen remains dark. How to control the brightness of foldable screens has always been a hot research topic in the field. Summary of the Invention

[0003] This application provides a foldable screen, a display system, an electronic device, and a screen brightness control method, which can solve the problem of screen over-brightness when the foldable screen is in a specific folded state.

[0004] In a first aspect, embodiments of this application provide a foldable screen connected to a display driver circuit (DDIC). The foldable screen may include a first screen and a second screen. When the foldable screen is in a first folded state, the first screen is lit up, and the data signal received by the second pixel unit is set to a high level 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 foldable screen may further include cathodes Vss1 and Vss2. The cathodes of the light-emitting components in the first pixel unit and the second pixel unit can be connected to the cathode Vss1, and the cathode Vss1 is kept at 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 can also be connected to the cathode Vss2. The DDIC can 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 foldable screen is in the first folded state. The DDIC can 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 foldable screen is not in the first folded state.

[0006] The first aspect provides a foldable screen that adds a cathode Vss2 to 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 foldable screen is in the aforementioned specific folded state, prevent the OLED from emitting light, and thus prevent the second screen from being lit up by the illicit means.

[0007] In conjunction with the first aspect, in some embodiments, such asFigure 5 As shown, the second screen may include a cathode Vss2 circuit, which is used to provide the cathode Vss2. The cathode Vss2 circuit includes multiple levels of cathode units, 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 of the first (or first-stage) Vss2 unit 601 in the cathode Vss2 circuit 60 can be connected to a DDIC to receive the Vss2 signal provided by the DDIC. However, this is not a limitation; the input of the first-stage Vss2 unit 601 can also be connected to other circuits to receive the Vss2 signal.

[0009] In conjunction with the first aspect, in some embodiments, the second screen may include a switching circuit connected to the DDIC. For example... 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 foldable screen is in the first folded state. Specifically, the DDIC is used to control the switching circuit to be turned on when the foldable screen is in the first folded 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 foldable screen is not in the first folded state. Specifically, the DDIC is used to control the switching circuit to be turned off when the foldable screen is not in the first folded state.

[0011] In conjunction with the first aspect, in some embodiments, such as Figure 8 As shown, the switching circuit may include: a set of field-effect transistors T8 and T9, and an inverting circuit. The number of the field-effect transistors T8 is equal to the number of pixel rows of the second screen. T8 is a PMOS 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, the drain of T9 is connected to the output of the inverting circuit, and the input of the inverting circuit is connected to the output of the reset circuit of the second screen to receive the reset signal of the second screen. The reset signal is high when the folding screen is in the first folded state. The gate of T9 is connected to the DDIC.

[0012] exist Figure 8 In this embodiment, T8 can be an NMOS transistor. Thus, the inverting circuit can be removed from the switching circuit. The switching circuit may include: 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 terminal of the reset circuit of the second screen for receiving the reset signal of the second screen; the reset signal is high when the folded screen is in the first folded state; the gate of T9 is connected to the DDIC.

[0013] exist Figure 8 In this embodiment, the DDIC is used to control the switching circuit to conduct when the foldable screen is in the first folded state. Specifically, the DDIC is used to control T9 to turn on when the foldable screen is in the first folded state. After T9 is turned on, the ScanX signal output from its drain to the gate of T8 is also low, thereby turning on T8; after T8 is turned on, the low-level Vss2 is conducted to the OLED anode. In this way, the OLED anode voltage can be prevented from rising due to leakage current accumulation, effectively solving the problem of the second screen being overexposed in the first folded state.

[0014] exist Figure 8 In this embodiment, the DDIC is used to control the switching circuit to disconnect when the foldable screen is not in the first folded state. Specifically, the DDIC is used to control T9 to turn off when the foldable screen is in the first folded state. After T9 is turned off, the ScanX signal output from its drain to the gate of T8 is high, thereby turning off T8; after T8 is turned off, the anode voltage of the OLED is not affected by the low level Vss2.

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

[0016] In conjunction with the first aspect, in some embodiments, such as Figure 11 As shown, the switching circuit may include only: a set of field-effect transistors T8, the number of which is equal to the number of pixel rows of the second screen, the source of T8 being connected to the anode of the light-emitting component in the second pixel unit, the drain of T8 being connected to the cathode Vss2, and the gate of T8 being connected to the DDIC.

[0017] The DDIC is used to control the switching circuit to be turned on when the foldable screen is in the first folded state. Specifically, the DDIC is used to control T8 to be turned on when the foldable screen is in the first folded 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 be kept at a low level and avoid the second screen from being lit up.

[0018] The DDIC is used to control the switching circuit to disconnect when the foldable screen is not in the first folded state. Specifically, the DDIC is used to control T8 to turn off when the foldable screen is in the first folded state, so that the anode of the OLED is not affected by the low-level Vss2 signal.

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

[0020] In conjunction 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 less than the OLED's turn-on voltage, thereby preventing the OLED from emitting light.

[0021] Secondly, embodiments of this application provide a screen brightness control method, which can be applied to an electronic device including a foldable screen. The method may include: the electronic device detecting the folding state of the foldable screen; when the foldable screen is in a first folding state, the electronic device controls the output of a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit via DDIC control; when the foldable 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 via DDIC control of the cathode Vss2.

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

[0023] In conjunction with the second aspect, in some embodiments, the second screen may include a switching circuit 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 switching circuit, and the output terminal Vss2 is used to output the Vss2 signal;

[0025] The electronic device controls the output of a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit via DDIC control. Specifically, the electronic device controls the switching circuit to be turned on via DDIC.

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

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

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

[0029] The electronic device controls the switching circuit to disconnect via DDIC, which can specifically include: the electronic device controlling T8 to turn on via DDIC; the electronic device controlling the switching circuit to disconnect via DDIC can specifically include: the electronic device controlling T8 to turn off via DDIC.

[0030] Thirdly, embodiments of this application provide a display system that may include a foldable screen and a display driving circuit, wherein the foldable screen is connected to the display driving circuit, and the foldable screen may be any one or more of the foldable screens described in the first aspect.

[0031] Fourthly, embodiments of this application provide an electronic device that may include: a memory, a processor, and a display system described in the third aspect, 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, the computer program code including computer instructions, which, when executed by the processor, cause the method described in any one or more embodiments of the second aspect to be performed. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0033] Figure 1 A foldable screen is shown;

[0034] Figure 2 It shows Figure 1 The foldable screen shown here uses a display structure.

[0035] Figure 3A This illustrates a pixel unit used in the display circuit;

[0036] Figure 3B It shows Figure 3A The pixel unit shown is composed of a device.

[0037] Figures 4A-4B This application illustrates a pixel unit provided in an embodiment of the present application;

[0038] Figure 5 This application illustrates a second screen provided in an embodiment of the present application;

[0039] Figure 6 This application illustrates another pixel unit applied to a second screen, according to an embodiment of the present application.

[0040] Figure 7 This application illustrates one configuration of a switching circuit provided in an embodiment.

[0041] Figure 8 This application illustrates another second screen provided by an embodiment of the present application;

[0042] Figure 9 This illustrates yet another pixel unit and another configuration of the switching circuit provided in an embodiment of this application;

[0043] Figure 10 This application illustrates yet another second screen provided by an embodiment of the present application;

[0044] Figure 11 This illustrates yet another configuration of the switching circuit provided in an embodiment of this application;

[0045] Figure 12 This application illustrates yet another second screen provided by an embodiment of the present application;

[0046] Figure 13 This application illustrates yet another second screen provided by an embodiment of the present application;

[0047] Figure 14 This application illustrates a display system provided in an embodiment;

[0048] Figure 15 An electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0049] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be a limitation of this application.

[0050] Figure 1 A foldable screen is shown. This foldable screen can be composed of multiple screens, such as... Figure 1 The main screen and secondary screen shown are connected by hinges and other connecting components, and can be bent at the connection points. This foldable screen can have multiple folding states, such as folded, unfolded, book-like, and desktop-like. In a specific folding state, one or more screens are lit, while another one or more screens are in a dark state. The lit screens display information, while the dark screens do not.

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

[0052] In the first folded state, the illuminated screen within the folded screen can be referred to as the first screen, and the screen set to a dark state can be referred to as the second screen. For example, when a dual-screen foldable screen is in the outward folded state, both the main screen and the secondary screen are exposed. The main screen can be illuminated for display, while the secondary screen can be set to a dark state and not used for display. In this example, the first screen and the second screen can be the main screen and the secondary screen, respectively.

[0053] Figure 1 The foldable screen shown can use Gate On Array (GOA) technology, which enables the display to perform progressive scan driving. Figure 1 In this context, GOA represents the drive signal (Gate) output by the GOA circuit in the display screen. It can include a data hold signal and a data write control signal. The data hold signal is used to control the light-emitting diodes in the pixel units of the display screen to maintain their brightness, and the data write control signal is used to enable the input terminal Data of the pixel unit to receive data writes from the display driver integrated circuit (DDIC). Figure 1 In this context, Reset represents the reset control signal output to the pixel unit, and EM represents the light emission enable signal output to the pixel unit.

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

[0055] like Figure 1As shown, the foldable screen can be connected to the motherboard-side circuitry via a flexible printed circuit (FPC), which may include a DDIC, a central processor (CPU), and so on.

[0056] Figure 2 It shows Figure 1 The foldable screen shown employs a display structure. For example... Figure 2 As shown, the display may include: display circuit 20, GOA circuit 30, Reset circuit 40, and EM circuit 50.

[0057] The display circuit 20 may include multiple pixel units, such as pixel unit 211, pixel unit 212, etc. These pixel units can be organized in rows and columns. A pixel unit may have: a drive signal input terminal (labeled Gate), a reset control signal input terminal (labeled Reset), a light emission enable signal input terminal (labeled EM), a data signal input terminal (labeled Data), and a reference voltage input terminal, such as Vref1 and Vref2. The drive signal input terminal (Gate) can be used by the pixel unit to receive the row scan signal Gate output by the GOA circuit 30, thereby controlling the light emission diode in the pixel unit to maintain its brightness, and enabling the input terminal Data of the pixel unit to receive data written by the DDIC. This data writing is manifested as a data voltage Vdata applied to the input terminal Data. The input terminal Reset can be connected to the DDIC and can be used by the pixel unit to receive a reset signal provided externally (such as by the DDIC) and perform a reset process. The input terminal EM receives the light emission enable signal and controls the transmission of the data signal (Data) to the light-emitting component OLED. The input terminal Data can be connected to the DDIC and can be used by the pixel unit to receive the data signal from the DDIC and adjust the light emission of the light-emitting component. The reference voltage input terminal can be connected to a DDIC, allowing the pixel unit to receive an external (such as a DDIC) reference voltage and perform reset processing based on that reference voltage. For example, the data signal can be reset according to the reset voltage of input terminal Vref1 (also known as reset voltage Vref1), restoring the data signal to its default value, which is typically set to a dimmer brightness value. As another example, the anode voltage of the light-emitting component (such as an OLED) in the pixel unit can be reset according to the reset voltage of input terminal Vref2 (also known as reset voltage Vref2).

[0058] The GOA circuit 30 may include multiple GOA units 301 (Scan1). These multiple GOA units 301 are cascaded, with each GOA unit 301 generating a Gate signal as the input signal (STV) to the next GOA unit 301. STV stands for Frame 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 line scan time, i.e., the time to complete one line scan. The Gate signal output by the i-th GOA unit 301 is also output to the Gate input terminal of the i-th row pixel unit.

[0059] The Reset circuit 40 may include multiple Reset units 401 (Scan2). These multiple Reset units 401 are cascaded, with each Reset unit 401 generating a Reset signal as the input signal for the next Reset unit 401. The Reset signal output by the i-th Reset unit 401 is 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 Reset terminal of the i-th row pixel unit.

[0060] The EM circuit 50 may include multiple EM units 501. These multiple EM units 501 are also cascaded, with each EM unit 501 generating an EM signal as the input signal for the next EM unit 501. The EMVP signal output by the i-th EM unit 501 is 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 i-th row pixel unit.

[0061] Figure 2 In this context, Scan CK / CB represents the clock signal pair supplied to GOA circuit 30 and Reset circuit 40. Scan CK can represent the clock signal used for odd-numbered rows, and Scan CB can represent the clock signal used for even-numbered rows. EM CK / CB represents the clock signal pair supplied to EM circuit 50. EM CK can represent the clock signal used for odd-numbered rows, and EM CB can represent the clock signal used for even-numbered rows.

[0062] Figure 3A This illustrates a pixel unit used in the display circuit 20. For example... Figure 3A As shown, a pixel unit may include: two light-emitting switch modules, two data writing modules, two anode reset modules, a driving transistor, and an OLED light-emitting component. The driving transistor may be a thin-film transistor (TFT). Figure 3B It shows Figure 3A The pixel unit shown is composed of a device. Figure 3A The light-emitting switch module, data writing module, and anode reset module shown can all be implemented using field-effect transistors (TFTs), as follows: Figure 3B As shown. In Figure 3B In this configuration, MOSFET T3 is the driver transistor, MOSFET T2 and T4 are both data writing modules, MOSFETs T5 and T6 are light-emitting control switch modules, and MOSFETs T1 and T7 are anode reset modules. The drain of MOSFET T2 is electrically connected to the input terminal Data to receive data written by the DDIC. The gate of MOSFET T2 is electrically connected to the input terminal Gate to receive the data writing control signal output by GOA unit 30. The gate of MOSFET T4 is also electrically connected to the input terminal Gate to receive the row scan signal Gate output by GOA unit 30. The gates of MOSFETs 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 receive an externally provided reference voltage.

[0063] The voltage levels of the reset signal (Reset) and the data signal (Data) affect the brightness of the OLED light-emitting component. Generally, the brightness of the screen can be controlled by adjusting their values ​​to regulate the OLED's light emission.

[0064] Figures 3A-3B In the diagram, Vdd and Vss1 can represent the positive electrode (or anode) and the negative electrode (or cathode), respectively. Vss1 is connected to the cathode of the OLED and is the shared cathode of the entire foldable screen, i.e., the common cathode. The pixel units of each screen in the foldable screen use the same cathode.

[0065] To control the second screen to be in a dark state, one approach is to set the Gate, EM, and Reset signals of the pixel units on the second screen to a high level to turn off the corresponding TFTs. Furthermore, the Data signal is set to a high potential VGMP, making its potential equal to or close to Vdd, thereby controlling the potential at point N2 to be low, preventing the OLED from emitting light, and ultimately putting the second screen 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, and is a high level for the source drive. Here, the TFTs turned off by setting the Gate input to a high level are T2 and T4; the TFT turned off by setting the EM input to a high level is T6; the TFT turned off by setting Reset1 input to a high level is T1; and the TFT turned off by setting Reset2 input to a high level is T7. Additionally, setting the Data signal to a high potential VGMP, making its potential equal to or close to Vdd, controls the potential at point N2 to be low.

[0066] In the above solution, prolonged shutdown of T1, T2, T4, T6, and T7 can cause screen ghosting. To address this, another solution involves switching the Gate, EM, and Reset signals of the second screen's pixel units between high and low levels. This dynamically switches these TFTs between off and on, preventing them from remaining off for extended periods and thus resolving the ghosting issue. While Gate, EM, and Reset are switching between high and low levels, the Data signal is set to a high potential VGMP, making its potential equal to or close to Vdd. This controls the potential at point N2 to be low, preventing the OLED from emitting light and ultimately keeping the screen in a dark state. Furthermore, to reduce power consumption, the duration of the Gate, EM, and Reset signals at low levels is longer than their duration at high levels.

[0067] However, in both of the above solutions, when the second screen is in a dark state, leakage current accumulates in the pixel units of the second screen along the paths from T5 to T3 and then to T6, as well as from T2 to T3 and then to T6. This causes the potential at point N2 to gradually increase, and the voltage difference between N2 and Vss1 approaches the OLED's turn-on voltage (or light-emitting voltage), causing the OLED to emit light and resulting in the second screen lighting up. This problem can also be called "second screen stealth lighting." However, Vss1 is a common cathode, and the potential of Vss1 cannot be increased solely to address the second screen stealth lighting problem, as this would affect the normal operation of the first screen.

[0068] To address the issue of the second screen emitting light when a foldable screen is in a folded state, this application provides a foldable screen that adds a cathode Vss2 around the second screen and connects the newly added cathode Vss2 to the anode of the OLED in the pixel of the second screen. This resets the anode of the OLED when the foldable screen is in the aforementioned specific folded state, preventing the OLED from emitting light and thus avoiding the second screen emitting light.

[0069] Figures 4A-4B An embodiment of this application provides a pixel unit. This pixel unit can be applied to the second screen of a foldable screen. Figure 4A and Figure 4B As shown, the pixel unit may include an input terminal Vss2, which is 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 Vss1, the anode potential of the OLED (the potential at point N2) is also low, and will not rise due to leakage current accumulation in the light-emitting switch module. In this case, the input terminal Vss2 can be considered as an additional cathode Vss2 for 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 This application illustrates a second screen provided in an embodiment of the present application, wherein the pixel units in the second screen can be as follows: Figure 4A and Figure 4B As shown. The second screen is connected to the DDIC. (As indicated) Figure 5 As shown, in Figure 2 Based on the display structure shown, the pixel units in the second screen have an added Vss2 input, which can be connected to the anode of the OLED. For example... Figure 5 As shown, the display may further include a cathode Vss2 circuit 60. The cathode Vss2 circuit 60 may include multiple cathode Vss2 units 601, which are cascaded. Each Vss2 unit 601 generates a Vss2 signal as the input signal for the next Vss2 unit 601. 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 stage Vss2 unit 601 is also output to the Vss2 input terminal of the i-th row pixel unit. 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 the Vss2 signal provided by the DDIC. However, this is not a limitation; the input terminal of the first-stage Vss2 unit 601 may also be connected to other circuits to receive the Vss2 signal.

[0071] Based on including Figure 5 The second screen shown in this application embodiment also provides a screen brightness control method, which may include the following steps: when the folding screen is in a first folded 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 folded 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 This application illustrates another pixel unit used in a second screen, as provided in an embodiment of this application.

[0073] like Figure 6 As shown, in this pixel unit, the anode of the OLED can be connected to the cathode Vss2 via a switching circuit 70. A DDIC can be connected to the switching circuit 70 to output a control signal Ctr1 to the switching circuit 70 to control the switching 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, the DDIC can control the switching circuit 70 to be turned on, thereby controlling the transmission of the low-level Vss2 signal to the anode of the OLED. The DDIC can also control the switching 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 this circuit, the Vss2 signal can be provided by the DDIC or by other circuits.

[0076] Figure 7 One component composition of the switching circuit 70 is shown. For example... Figure 7 As shown, the switching circuit 70 may include: a field-effect transistor T8, a field-effect transistor T9, and an inverter circuit. 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 of the inverter circuit, and the input of the inverter circuit is connected to Reset2. The gate of T9 is connected to DDIC to receive the control signal Ctr1 output by DDIC. The signal input to the gate of T8 can be labeled ScanX. When ScanX is high, T8 is off; when ScanX is low, T8 is on.

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

[0078] Table 1

[0079]

[0080]

[0081] As shown in Table 1, when the foldable screen is in its first folded state, the Reset2 signal is high and can remain high, being input to the inverting circuit. The inverting circuit inverts the 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 from its drain to the gate of T8 is also low, thus turning on T8. After T8 is turned on, the low-level Vss2 is conducted to the OLED anode. In this way, the OLED anode voltage is prevented from rising due to leakage current accumulation, effectively solving the problem of the second screen dimming in the first folded state.

[0082] As shown in Table 1, when the foldable screen is not in the first fold state (other fold states), such as when the entire screen is fully lit, the Reset2 signal can be high and remain high, 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. Alternatively, when the entire screen is off and in a dark state, the Reset2 signal can be low, and after inversion by the inverting circuit, it outputs a high-level signal, which is input to the source of T9. At this time, the high-level Ctrl signal output by DDIC turns off T9. After T9 is turned off, its drain output to the gate of T8, the ScanX signal, is high, which 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 to this; T8 can also be an NMOS type field-effect transistor, in which case the inverting circuit in the switching circuit 70 can be removed.

[0084] Figure 8 This application illustrates another second screen provided by an embodiment of the present application, wherein 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 switching circuit 70. The switching circuit 70 may include: an inverter circuit, a field-effect transistor T9, and a set of field-effect transistors T8, the number of which may be equal to the number of pixel rows in the second screen.

[0086] In this configuration, 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 labeled ScanX; the drain of T8 corresponding to the i-th row of pixels is connected to the output of the i-th stage Vss2 unit 601, and is used to receive the Vss2 signal output by the i-th stage Vss2 unit; the source of T8 corresponding to the i-th row of pixels is connected to the Vss2 input of each pixel unit in the i-th row of pixels.

[0087] In this circuit, 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 of the inverter circuit, and the input of the inverter circuit is connected to the reset signal Reset of the second screen, i.e., the aforementioned Reset2.

[0088] Based on including Figure 8The second screen shown in this application also provides a screen brightness control method, which may include the following steps: When the folding screen is in a first folded 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 folded 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, thereby conducting 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 be kept at a low level and avoid the second screen from being overexposed.

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

[0090] When the foldable screen is not in the first folded 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 folded states.

[0091] In some embodiments, such as Figure 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 in the second screen. The source of T8 is connected to the anode of the OLED; the drain of T8 serves as the Vss2 input terminal of the pixel unit, used to receive the Vss2 signal. For example, the drain of T8 can be 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 serves as the ScanX input terminal of the pixel unit. For example, the gate of T8 can be connected to the output terminal of the ScanX signal of the switching circuit 70 to receive the ScanX signal output by the switching circuit 70. Thus, T8 is no longer a component of the switching circuit 70, and the switching circuit 80 can be composed only of an inverter circuit and field-effect transistor T9. Of course, it can also be considered that T8 is functionally part of the switching circuit 70.

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

[0093] Figure 9 In the pixel unit shown, T8 is a PMOS type field-effect transistor. However, it is not limited to this; T8 can also be an NMOS type field-effect transistor, in which case the inverting circuit in the switching circuit 70 can be removed.

[0094] Figure 10 This application illustrates another type of second screen provided by an embodiment of the present application, wherein the pixel units in the second screen can be as follows: Figure 9 As shown, this integrates T8. The second screen is connected to the DDIC.

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

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

[0097] In this circuit, the gate of T9 is connected to DDIC to receive the control signal Ctr1 output by DDIC; the drain of T9 is connected to the output of the inverter circuit, and the input of the inverter circuit is connected to the reset signal Reset of the second screen, i.e., the aforementioned Reset2.

[0098] Based on including Figure 10The screen brightness control method provided in this application embodiment for the foldable screen of the second screen may include the following steps: When the foldable screen is in the first folded 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 foldable screen is in the first folded 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 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 be kept at a low level and avoid the second screen from being overexposed.

[0099] When the foldable screen is not in the first folded 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 terminal of the pixel unit does not output a low-level signal, thereby making the OLED anode unaffected by the Vss2 signal.

[0100] In some embodiments, such as Figure 11 As shown, the switching circuit 70 may consist of only 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, and the gate of T8 is used as the ScanX input and connected to the ScanX output of the DDIC.

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

[0102] and Figure 10 The difference is, Figure 12 In the second screen shown, the ScanX input of the pixel unit can be directly connected to the ScanX output of the DDIC to receive the ScanX signal output by the DDIC. When the foldable screen is in the first folded 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, thereby controlling the anode voltage of the OLED to remain at a low level and preventing the second screen from being lit up by accident. When the foldable screen is not in the first folded 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 Figure 12As shown, T8 can also be shared by each row of pixel units instead of being integrated into the pixel unit. (See reference...) Figure 13 .exist Figure 13 In the illustrated embodiment, the pixel unit no longer has a ScanX input terminal, and each row of pixels can share a T8. The source of the 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 the T8 corresponding to the i-th row of pixels is connected to the output terminal of the i-th stage Vss2 unit 601, for receiving the Vss2 signal output by the i-th stage Vss2 unit; the gate of the T8 corresponding to the i-th row of pixels can all be connected to the ScanX output terminal of the DDIC.

[0104] Based on including Figure 13 The second screen shown in this application also provides a screen brightness control method, which may include the following steps: When the foldable screen is in a first folded state, the DDIC can 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, thereby controlling the anode voltage of the OLED to remain at a low level and preventing the second screen from being overexposed. When the foldable screen is not in the first folded 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 illustration, Figure 5 , Figure 8 , Figure 10 , Figure 12 , Figure 13 The clock signal pair Scan CK / CB supplied to the GOA circuit 30 and Reset circuit 40, and the clock signal pair EM CK / CB supplied to the EM circuit 50 are not shown on the screen.

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

[0107] Figure 14 A display system 60 provided in an embodiment of this application is shown. For example... Figure 14 As shown, the display system 60 may include a foldable screen 61 and a display driving circuit 62.

[0108] The foldable screen 61 may include multiple screens. These screens may be organic light-emitting diode (OLED) display panels, where each pixel unit includes an OLED. The foldable screen 61 may include... Figure 5 , Figure 8 , Figure 10 , Figure 12 or Figure 13 The second screen described in the embodiment.

[0109] The display driving circuit 62 may include a display driving circuit, such as a DDIC, used to control and drive the folding screen 61 for display. 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 brightness and color. The display driving circuit 62 may also include a circuit part for timing control, such as a time controller (TCON). The time controller can set the timing of control signals and data signals, and transmit the control signals and data signals to the display driving circuit according to the timing sequence.

[0110] The display driving circuit 62 may also be provided with a storage unit to store the code instructions of the screen brightness control method provided in the embodiments of this application. When the code instructions are reread from the storage unit and run, the display system 60 can 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, digital logic circuits and registers that perform the functions described in the foregoing method embodiments. The display driver circuit 62 can be implemented as one or more chips. When it is implemented as a single chip, its various functions are integrated into this chip; when it is implemented as multiple chips, such as in a chip system, its various functions can be separately integrated into different independent chips.

[0112] Figure 15 An electronic device 100 provided in an embodiment of this application is shown.

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

[0114] like Figure 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, a headphone jack 170D, a sensor module 180, buttons 190, a motor 191, an indicator 192, a camera 193, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a gyroscope sensor 180B, an accelerometer sensor 180E, and a touch sensor 180K, etc. The various components in the electronic device 100 can be connected via a bus.

[0115] The processor 110 can be one or more, and they can be integrated into an integrated circuit of a system-on-a-chip (SOC). An SOC is a system-on-a-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 can be an application processor (AP). The CPU and GPU can be used to render and composite the image to be displayed on the display screen 130. The processor 110 may also include a neural network processing unit (NPU), a modem processor, etc.

[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 / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface.

[0117] The processor 110 may include a cache memory, which can be used to store instructions or data that the processor 110 has just used or that are used repeatedly. If the processor 110 needs to use the instruction or data again, it can directly retrieve it 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. The program storage area may store the operating system and one or more applications (such as games), while the data storage area may store data created by the user during use of the electronic device 100 (such as photos and contacts). The memory 120 may be a high-speed random access memory or a non-volatile memory, such as a hard disk, flash memory, or universal flash storage (UFS). 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 for the screen brightness control method provided in the embodiments of this 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 can also be integrated with the processor 110 into the integrated circuit of the SOC.

[0121] Electronic device 100 can realize display function through SOC, DDIC 140, and display screen 130.

[0122] The display screen 130 can be a foldable screen, or the display 10 described in the foregoing embodiments. The foldable screen can be composed of multiple screens, such as… Figure 1 The main screen and secondary screen shown are connected by hinges or other connecting components, and can be bent at the connection point. This foldable screen can have a specific folding state, namely the aforementioned first folding state. In this specific folding state, one or more screens are lit up, while another one or more screens are in a dark state. The lit screen displays information, while the dark screen does not display anything. In the first folding state, the lit screen can be called the first screen, and the screen set to a dark state can be called the second screen.

[0123] The display driver integrated circuit (DDIC) 140 serves as the control core of the display screen 130, driving the display screen 130 to operate and receiving data from the SOC (processor 110), such as image data and some instructions. The DDIC 140 can send drive signals and data to the display panel of the display screen 130 in the form of electrical signals, thereby controlling the screen brightness and color, enabling image information such as letters and pictures to be displayed on the screen and completing the screen refresh.

[0124] The image data to be displayed sent by the SOC to the DDIC 140 can be stored in the frame buffer to complete the display sending (or image sending). Then, the DDIC 140 retrieves the image data from the frame buffer and drives the display screen 130 to display it.

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

[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 one or more communication frequency bands. Different antennas can also be multiplexed to improve antenna utilization. For example, antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antennas can be used in conjunction with tuning switches.

[0127] The mobile communication module 150 can provide solutions for wireless communication, including 2G / 3G / 4G / 5G, applied to the electronic device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves via antenna 1, and perform filtering, amplification, and other processing on the received electromagnetic waves before transmitting them to a modem processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modem processor and convert it into electromagnetic waves for radiation via antenna 1. In some embodiments, at least some functional modules of the mobile communication module 150 may be housed in the processor 110. In some embodiments, at least some functional modules of the mobile communication module 150 and at least some modules of the processor 110 may be housed in the same device.

[0128] The modem processor may include a modulator and a demodulator. The modulator modulates the low-frequency baseband signal to be transmitted into a mid-to-high frequency signal. The demodulator demodulates 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 processing by the baseband processor, the low-frequency baseband signal is transmitted to the application processor. The application processor outputs sound signals through an audio device (not limited to speaker 170A, receiver 170B, etc.) or displays images or videos through the display screen 130. In some embodiments, the modem processor may be a separate device. In other embodiments, the modem processor may be independent of the processor 110 and may be housed in the same device as the mobile communication module 150 or other functional modules.

[0129] The wireless communication module 160 can provide solutions for wireless communication applications on the electronic device 100, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies. 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 antenna 2, performs frequency modulation and filtering of the electromagnetic wave signals, and sends the processed signal to processor 110. The wireless communication module 160 can also receive signals to be transmitted from processor 110, perform frequency modulation and amplification, and convert them into electromagnetic waves for radiation via antenna 2.

[0130] In some embodiments, antenna 1 of electronic device 100 is coupled to mobile communication module 150, and antenna 2 is coupled to wireless communication module 160, enabling electronic device 100 to communicate with networks and other devices via 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 technologies, etc. The GNSS may include the Global Positioning System (GPS), the Global Navigation Satellite System (GLONASS), the BeiDou Navigation Satellite System (BDS), the Quasi-Zenith Satellite System (QZSS), and / or satellite-based augmentation systems (SBAS).

[0131] Electronic device 100 can perform shooting functions through ISP, camera 193, video codec, GPU, display 130 and application processor.

[0132] The ISP (Image Signal Processor) is used to process data fed back from the camera 193. For example, when taking a picture, the shutter is opened, and light is transmitted through the lens to the camera's photosensitive element. The light signal is converted into an electrical signal, and the camera's photosensitive element transmits the electrical signal to the ISP for processing, transforming it into an image visible to the naked eye. The ISP can also perform algorithmic optimization of image noise, brightness, and color. The ISP can also optimize parameters such as exposure and color temperature of the shooting scene. In some embodiments, the ISP can be set in the camera 193.

[0133] Camera 193 is used to capture still images or videos. An object is projected onto a photosensitive element by generating an optical image through the lens. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) photoelectric field-effect transistor. The photosensitive element converts the light signal into an electrical signal, which is then passed to an ISP for conversion into a digital image signal. The ISP outputs the digital image signal to a DSP for processing. The DSP converts the digital image signal into image signals in standard RGB, YUV, or other formats. In some embodiments, the electronic device 100 may include one or N cameras 193, where N is a positive integer greater than 1.

[0134] Digital signal processors (DSPs) are used to process digital signals. Besides digital image signals, they can also process other digital signals. For example, when electronic device 100 selects a frequency, the DSP can perform Fourier transforms on the frequency energy.

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

[0136] An NPU (Neural Processing Unit) is a computational processor for neural networks (NNs). By borrowing the structure of biological neural networks, such as the transmission patterns between neurons in the human brain, it can rapidly process input information and continuously learn on its own. NPUs enable intelligent cognitive applications in electronic devices, such as image recognition, facial recognition, speech recognition, and text understanding.

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

[0138] The audio module 170 is used to convert digital audio information into analog audio signals for output, and also to convert analog audio input into digital audio signals. The audio module 170 can also be used for encoding and decoding audio signals. In some embodiments, the audio module 170 may be located in the processor 110, or some functional modules of the audio module 170 may be located in the processor 110.

[0139] The speaker 170A, also known as a "loudspeaker," is used to convert audio electrical signals into sound signals. The electronic device 100 can listen to music or make hands-free calls through the speaker 170A.

[0140] The receiver 170B, also known as the "earpiece," is used to convert audio electrical signals into sound signals. When the electronic device 100 answers a telephone call or voice message, the receiver 170B can be brought close to the ear to listen to the voice.

[0141] Microphone 170C, also known as a "microphone" or "voice transducer," is used to convert sound signals into electrical signals. When making a phone call or sending a voice message, the user can speak by bringing their mouth close to microphone 170C, inputting the sound signal into microphone 170C. Electronic device 100 may have at least one microphone 170C. In some embodiments, electronic device 100 may have two microphones 170C, which, in addition to collecting sound signals, can also perform noise reduction. In other embodiments, electronic device 100 may also have three, four, or more microphones 170C, which can collect sound signals, reduce noise, identify the sound source, and perform directional recording, etc.

[0142] The 170D headphone jack is used to connect wired headphones. The 170D headphone jack can be a USB interface or a 3.5mm Open Mobile Terminal Platform (OMTP) standard interface, a CTIA (Cellular Telecommunications Industry Association of the USA) standard interface.

[0143] Buttons 190 include a power button, volume buttons, etc. Buttons 190 can be mechanical buttons or touch buttons. Electronic device 100 can receive button input and generate key signal inputs related to user settings and function control of electronic device 100. Motor 191 can generate vibration prompts. SIM card interface 195 is used to connect a SIM card. The SIM card can be inserted into or removed from the SIM card interface 195 to achieve contact and separation with electronic device 100.

[0144] Figure 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 illustrated, or combine some components, or separate some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0145] The steps of the methods or algorithms described in conjunction with the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, read-only optical discs (CD-ROMs), or any other form of storage medium well known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Additionally, the ASIC can reside in a transceiver or relay device. Alternatively, the processor and storage medium can exist as discrete components in a wireless access network device or user equipment.

[0146] Those skilled in the art will recognize that the functions described in the embodiments of this application in one or more of the above examples can be implemented using 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 code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0147] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A folding screen, characterized in that, The folding screen is connected with 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 lighted, a data signal received by a second pixel unit is set to a high level, and the second screen is controlled 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 cathode Vss1 is a common cathode of the first screen and the second screen, cathodes of light emitting components in the first pixel unit and the second pixel unit are connected with the cathode Vss1, and the cathode Vss1 keeps a low level; the first pixel unit is a pixel unit in the first screen; the cathode Vss2 is arranged at a periphery of the second screen, the second pixel unit in the second screen has a Vss2 input end connected with the cathode Vss2, and the Vss2 input end is further connected with an anode of the light emitting component in the second pixel unit; the second screen further includes a cathode Vss2 circuit, the cathode Vss2 circuit includes multiple cathode units, wherein, an i-th cathode unit is connected with an anode of the light emitting component in an i-th row of the second pixel unit, and is used for outputting the low-level Vss2 signal to the anode of the light emitting component in the i-th row of the second pixel unit; The second pixel unit further includes a switch circuit, the anode of the light emitting component in the second pixel unit is connected with the cathode Vss2 through the switch circuit, and the switch circuit is further connected with the DDIC; wherein, the switch circuit includes a field effect transistor T8 and a field effect transistor T9, a source of the T8 is connected with the anode of the light emitting component in the second pixel unit, a drain of the T8 is connected with the cathode Vss2, a gate of the T8 is connected with a source of the T9, a drain of the T9 is used for receiving a reset signal of the second screen; the reset signal is a high level when the folding screen is in the first folding state; a gate of the T9 is connected with the DDIC, and is used for receiving a control signal Ctrl output by the DDIC; The DDIC is used for controlling the cathode Vss2 to output the 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 further used for controlling the cathode Vss2 to stop outputting the low-level 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 of claim 1, wherein, The second screen includes a switch circuit, and the switch circuit is connected with the DDIC; The anode of the light emitting component in the second pixel unit is further connected with the cathode Vss2, specifically including that the anode of the light emitting component in the second pixel unit is connected with an output end of the cathode Vss2 circuit through the switch circuit, and the output end is used for outputting the low-level Vss2 signal; The DDIC is configured to control the cathode Vss2 to output a low-level signal when the folding screen is in the first folding state, and specifically, the DDIC is configured to control the switch circuit to be turned on when the folding screen is in the first folding state. The DDIC is further configured to control the cathode Vss2 to stop outputting the low-level 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, and specifically, the DDIC is configured to control the switch circuit to be turned off when the folding screen is not in the first folding state.

3. The folding screen of claim 2, wherein, The DDIC is configured to control the switch circuit to be turned on when the folding screen is in the first folding state, and specifically, the DDIC is configured to control T9 to be turned on when the folding screen is in the first folding state. The DDIC is configured to control the switch circuit to be turned off when the folding screen is not in the first folding state, and specifically, the DDIC is configured to control T9 to be turned off when the folding screen is not in the first folding state.

4. The folding screen of claim 3, wherein, T9 is a PMOS tube, and the first control signal is a low-level signal; or, T9 is an NMOS tube, and the first control signal is a high-level signal.

5. The folding screen according to claim 3 or 4, characterized in that The cathode Vss1 and the cathode Vss2 have the same level.

6. A screen brightness control method characterized by comprising: The method is applied to an electronic device including a folding screen connected with a display driving circuit (DDIC), the folding screen including a first screen and a second screen, when the folding screen is in a first folding state, the first screen is lit, and a data signal received by a second pixel unit is set to a high level, for controlling 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 comprises a cathode Vss1 and a cathode Vss2, the cathode Vss1 is a common cathode of the first screen and the second screen, the cathode of the light-emitting component in the first pixel unit and the cathode of the light-emitting component in the second pixel unit are connected to the cathode Vss1, and the cathode Vss1 keeps low level; the first pixel unit is a pixel unit in the first screen; the cathode Vss2 is arranged at the periphery of the second screen, the second pixel unit in the second screen has a Vss2 input end connected to the cathode Vss2, and the Vss2 input end is further connected to the anode of the light-emitting component in the second pixel unit; the second screen further comprises a cathode Vss2 circuit for providing the cathode Vss2, the cathode Vss2 circuit comprises a plurality of cathode units, wherein the i-th cathode unit is connected to the anode of the light-emitting component in the i-th row of the second pixel unit, and is used for outputting the low-level Vss2 signal to the anode of the light-emitting component in the i-th row of the second pixel unit; the second pixel unit further comprises a switch circuit, the anode of the light-emitting component in the second pixel unit is connected to the cathode Vss2 through the switch circuit, and the switch circuit is further connected to a DDIC; wherein the switch circuit comprises a field effect transistor T8 and a field effect transistor T9, wherein the source electrode of T8 is connected to the anode of the light-emitting component in the second pixel unit, the drain electrode of T8 is connected to the cathode Vss2, the gate electrode of T8 is connected to the source electrode of T9, the drain electrode of T9 is used for receiving a reset signal of the second screen; the reset signal is high level when the folding screen is in a first folding state; the gate electrode of T9 is connected to the DDIC, and is used for receiving a control signal Ctrl output by the DDIC; Comprise: The electronic device detects the folding state of the folding screen; When the folding screen is in a first folding state, the electronic device controls the DDIC to output a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit through the cathode Vss2; When the folding screen is not in the first folding state, the electronic device stops outputting the low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit through the cathode Vss2 by the DDIC.

7. The method of claim 6, wherein, The folding screen is the folding screen of claim 2.

8. The method of claim 7, wherein, The second screen comprises a switch circuit connected to the DDIC; The anode of the light-emitting component in the second pixel unit is further connected to the cathode Vss2, specifically comprising: the anode of the light-emitting component in the second pixel unit is connected to the output end of the cathode Vss2 circuit through the switch circuit, and the output end is used to output the low-level Vss2 signal; The electronic device controls the DDIC to output a low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit through the cathode Vss2, specifically comprising: the electronic device controls the switch circuit to be turned on through the DDIC; The electronic device stops outputting the low-level Vss2 signal to the anode of the light-emitting component in the second pixel unit through the DDIC cathode Vss2, specifically comprising: the electronic device controls the switch circuit to be disconnected through the DDIC.

9. The method of claim 8, wherein, The folding screen is the folding screen of claim 3.

10. The method of claim 9, wherein, The electronic device controls the switch circuit to be turned on through the DDIC, specifically comprising: 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, specifically comprising: the electronic device controls T9 to be turned off through the DDIC.

11. The method of any one of claims 9-10, wherein, The folding screen is the folding screen of claim 5.

12. A display system characterized by, The display system comprises a folding screen and a display driving circuit, the folding screen is connected with the display driving circuit, and the folding screen is the folding screen of any one of claims 1-5.

13. An electronic device, comprising: The electronic device comprises a memory, a processor and the display system of claim 12, the memory is coupled with the processor, and the display system is coupled with the processor; wherein the memory is used for storing computer program code, the computer program code comprises computer instructions, and when the processor executes the computer instructions, the method of any one of claims 6-11 is executed.

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