An output voltage control circuit and control method

Abstract

The application provides an output voltage control circuit and a control method. The circuit comprises a voltage processing unit, a first switch, a data signal line, a reference voltage signal line and an output voltage signal line. The voltage processing unit receives a data voltage signal provided by the data signal line and a reference voltage signal provided by the reference voltage signal line, generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on a second data voltage signal and the reference voltage signal. The voltage processing unit is electrically connected to the control end of the first switch, and opens or closes the first switch through the first control signal and the second control signal. Therefore, the output voltage control circuit can generate different control signals according to different data voltage signals provided by the data signal line, realize control on the output voltage, and then realize control on the data voltage input into the pixel electrode.

Description

Technical Field

[0001] This application relates to the field of semiconductor technology, and in particular to an output voltage control circuit and a control method for the output voltage control circuit. Background Technology

[0002] With the rapid development of display technology, display panels are widely used in people's daily lives, such as in various electronic devices like televisions, computers, and mobile phones, and are playing an increasingly important role.

[0003] However, for some display panels, it is necessary to process the data voltage input to their pixel electrodes to obtain the desired voltage and provide it to the pixel electrodes for displaying the image. Summary of the Invention

[0004] In view of this, this application provides an output voltage control circuit, the scheme of which is as follows:

[0005] An output voltage control circuit is applied to a display panel. The output voltage control circuit includes: a voltage processing unit, a first switch, a data signal line, a reference voltage signal line, and an output voltage signal line.

[0006] The output voltage signal line is used to provide the output voltage. The input terminal of the first switch is electrically connected to the output voltage signal line, and the output terminal of the first switch is electrically connected to the output port of the output voltage control circuit.

[0007] The data signal line is used to provide a data voltage signal, which includes a first data voltage signal and a second data voltage signal. The reference voltage signal line is used to provide a reference voltage signal. The voltage processing unit is electrically connected to the data signal line and the reference voltage signal line respectively, receives the data voltage signal and the reference voltage signal, generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal.

[0008] The voltage processing unit is also electrically connected to the control terminal of the first switch, and opens or closes the first switch through the first control signal and the second control signal.

[0009] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0010] The output voltage control circuit provided in this application includes: a voltage processing unit, a first switch, a data signal line, a reference voltage signal line, and an output voltage signal line. The output voltage signal line provides the output voltage. The input terminal of the first switch is electrically connected to the output voltage signal line, and the output terminal of the first switch is electrically connected to the output port of the transmission voltage control circuit. The data signal line provides a data voltage signal, which includes a first data voltage signal and a second data voltage signal. The reference voltage signal line provides a reference voltage signal. The voltage processing unit receives the data voltage signal and the reference voltage signal, generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal.

[0011] As described above, when the data voltage signal is the first data voltage signal, the voltage processing unit generates a first control signal based on the first data voltage signal and the reference voltage signal. When the data voltage signal is the second data voltage signal, the voltage processing unit generates a second control signal based on the second data voltage signal and the reference voltage signal. The first and second control signals open or close the first switch T1. Furthermore, the input terminal of the first switch T1 is electrically connected to the output voltage signal line. When the first switch is open, the output voltage provided by the output voltage signal line is transmitted to the output port of the output voltage control circuit. When the second switch is closed, the output voltage signal cannot be transmitted to the output port of the output voltage control circuit. Since the reference voltage signal line is a constant voltage signal line, the first and second control signals actually change according to the different data voltage signals. Therefore, the output voltage control circuit can generate different control signals according to the different data voltage signals provided by the data signal line, thereby controlling the output voltage and ultimately controlling the data voltage input to the pixel electrode. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0014] Figure 1 This is a circuit diagram of an existing output voltage control circuit;

[0015] Figure 2 A circuit diagram of an output voltage control circuit provided in this application;

[0016] Figure 3 A circuit diagram of another output voltage control circuit provided in this application;

[0017] Figure 4 This is a timing diagram of the signals on the first gate signal line, the second gate signal line, and the data signal line;

[0018] Figure 5 A circuit diagram of yet another output voltage control circuit provided in this application;

[0019] Figure 6 A circuit diagram of yet another output voltage control circuit provided in this application;

[0020] Figure 7 A flowchart of a control method for an output voltage control circuit provided in this application. Detailed Implementation

[0021] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely one area of ​​this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] As described in the background section, some display panels require processing of the data voltage input to their pixel electrodes. For example, if the data signal line provides a high-voltage data signal, the output voltage control circuit processes the high-voltage data signal and outputs the required voltage. If the data signal line provides a low-voltage data signal, the output voltage control circuit does not process the low-voltage data, and no voltage signal is output.

[0024] like Figure 1 As shown, Figure 1This is a schematic diagram of an output voltage control circuit. The output voltage control circuit includes a data signal line Source and a switching transistor T. In this circuit, the data signal line Source is electrically connected to the control terminal of switch T and also to the input terminal of switch T. The output terminal of switch T is used to output a voltage signal. As can be seen from the above, the data signal line Source is electrically connected to the control terminal of switch T to control the opening of switch T. However, when the threshold voltage of switch T fluctuates or drifts, the voltage of the signal on the data signal line Source cannot cover the fluctuation or drift of the threshold voltage of switch T. This will cause switch T to malfunction and result in a voltage drop in the transmitted data voltage signal, thereby causing malfunction of the display panel.

[0025] In addition, according to Figure 1 As can be seen, Source is electrically connected to the control terminal of switch T, and also electrically connected to the input terminal of switch T, so that the gate and source voltages of switch T are both data signal voltages, which will also affect the operation of the display panel.

[0026] Based on this, this application provides an output voltage control circuit, which is applied to a display panel to provide voltage to the pixel electrodes 200 in the display panel, such as... Figure 2 The diagram shown is a schematic diagram of the circuit structure of a data voltage control circuit provided in this application. The output voltage control circuit includes: a voltage processing unit 100, a first switch T1, a data signal line Source, a reference voltage signal line V1, and an output voltage signal line V2.

[0027] The output voltage signal line V2 is used to provide the output voltage signal. The input terminal of the first switch T1 is electrically connected to the output voltage signal line V2. The output terminal of the first switch T1 is electrically connected to the output port of the transmission voltage control circuit. This output port is electrically connected to the pixel electrode to provide voltage to the pixel electrode.

[0028] The data signal line Source provides a data voltage signal, which includes a first data voltage signal and a second data voltage signal. The reference voltage signal line V1 provides a reference voltage signal. The voltage processing unit 100 is electrically connected to the data signal line Source and the reference voltage signal line V1, respectively, receives the data voltage signal and the reference voltage signal, and generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal.

[0029] The voltage processing unit 100 is also electrically connected to the control terminal of the first switch T1. Specifically, the output port of the voltage processing unit 100 is electrically connected to the first switch T1 to open or close the first switch T1 via a first control signal and a second control signal. That is, the first control signal opens the first switch T1 and the second control signal closes the first switch T1, or the first control signal closes the first switch T1 and the second control signal opens the first switch T1. It should be noted that the reference voltage signal line V1 is a constant voltage signal line, and the voltage of the reference voltage signal on it is a constant value. In addition, since the voltage signal output by the output voltage control circuit is used to provide the pixel electrode, the output voltage signal provided by the output voltage signal line V2 is the same as the voltage value of the data voltage signal on the data signal line Source. That is, if the data signal line Source provides the first data voltage signal, the output voltage signal provided by the output voltage signal line V2 is the same as the first data voltage signal; if the data signal line Source provides the second data voltage signal, the output voltage signal provided by the output voltage signal line V2 is the same as the second data voltage signal.

[0030] Specifically, the output voltage control circuit includes a voltage processing unit 100. When the data voltage signal is a first data voltage signal, the voltage processing unit 100 generates a first control signal based on the first data voltage signal and a reference voltage signal. When the data voltage signal is a second data voltage signal, the voltage processing unit 100 generates a second control signal based on the second data voltage signal and the reference voltage signal. The first and second control signals open or close the first switch T1. The input terminal of the first switch T1 is electrically connected to the output voltage signal line V2. When the first switch T1 is open, the output voltage provided by the output voltage signal line V2 is transmitted to the output port of the output voltage control circuit. When the second switch is closed, the output voltage signal cannot be transmitted to the output port of the output voltage control circuit. Since the reference voltage signal line V1 is a constant voltage signal line, the signal voltage value it provides remains unchanged. Therefore, the first and second control signals actually change according to the different data voltage signals. Thus, the output voltage control circuit can generate different control signals according to the different data voltage signals provided by the data signal line Source, thereby controlling the output voltage and ultimately controlling the data voltage input to the pixel electrode.

[0031] Based on the above embodiments, in one embodiment of this application, such as Figure 3 As shown, Figure 3 The circuit structure diagram of an output voltage control circuit provided in this application includes: a second switch T2, a third switch T3, a fourth switch T4, a fifth switch T5, a first capacitor C1, a second capacitor C2, a first gate signal line Gate1, and a second gate signal line Gate2.

[0032] Specifically, the control terminals of the second switch T2, the third switch T3, and the fourth switch T4 are electrically connected to the first gate signal line Gate1, and the control terminal of the fifth switch T5 is electrically connected to the second gate signal line Gate2. The input terminals of the second switch T2 and the third switch T3 are electrically connected to the data signal line Source, and the input terminal of the fourth switch T4 is electrically connected to the reference voltage signal line V1.

[0033] The first plate of the first capacitor C1 is electrically connected to the output terminal of the second switch T2, and the second plate of the first capacitor C1 is electrically connected to the output terminal of the fifth switch T5 and the output terminal of the fourth switch T4. The first plate of the second capacitor C2 is electrically connected to the output terminal of the third switch T3 and the input terminal of the fifth switch T5, and the second plate of the second capacitor C2 is electrically connected to the reference voltage signal line V1.

[0034] The first plate of the first capacitor C1 is also electrically connected to the first node P1, which is the output terminal of the output voltage control circuit. The control terminal of the first switch T5 is electrically connected to the first node P1.

[0035] Specifically, as described above, the first plate of the first capacitor C1 is electrically connected to the data signal line Source via the second switch T2, and the second plate is electrically connected to the reference voltage signal line V1 via the fourth switch T4. The first plate of the second capacitor C2 is electrically connected to the data signal line Source via the third switch T3, and the second plate is electrically connected to the reference voltage signal line V1. Furthermore, the control terminals of the second switch T2, the third switch T3, and the fourth switch T4 are electrically connected to the first gate signal line Gate1. Therefore, by controlling the second switch T2, the third switch T3, and the fourth switch T4 to open via the first gate signal line Gate1, the first plate of the first capacitor C1 and the second plate of the reference voltage signal are respectively charged with the data voltage signal and the reference voltage signal, respectively. Similarly, the first plate of the second capacitor C2 and the second plate of the second capacitor are also charged with the data voltage signal and the reference voltage signal, respectively.

[0036] In addition, the control terminal of the fifth switch T5 is electrically connected to the second gate signal line Gate2. Controlling the fifth switch T5 to open causes the first plate of the second capacitor C2 to connect with the second plate of the first capacitor C1, thereby connecting the first capacitor C1 and the second capacitor C2 in series. The charge on the first plate of the second capacitor C2 flows to the second plate of the first capacitor C1, changing the voltage of the first plate of the first capacitor C1 and generating a first control signal or a second control signal to control the opening and closing of the first switch T1, thereby controlling the output voltage.

[0037] Based on the above embodiments, in one embodiment of this application, the first gate signal line Gate1, the second gate signal line Gate2, and the data signal line Source are all pulse signal lines, and the reference voltage signal line V1 is a constant voltage signal line. Figure 4 As shown, Figure 4 This is a timing diagram showing the signal relationships of the first gate signal line Gate1, the second gate signal line Gate2, and the data signal line Source. When the data signal line Source provides a data voltage signal, the first gate signal line Gate1 provides a first control signal to open the second switch T2, the third switch T3, and the fourth switch T4. After the second switch T2, the third switch T3, and the fourth switch T4 are closed, the second gate signal line Gate2 provides a second control signal to open the fifth switch T5. Specifically, according to... Figure 4 As can be seen, when the output voltage control circuit is working, the data signal line Source first provides a data voltage signal. Simultaneously, the first gate signal line Gate1 provides a first control signal, opening the second switch T2, the third switch T3, and the fourth switch T4 to charge the first capacitor C1 and the second capacitor C2. When the first control signal pulse ends, the second switch T2, the third switch T3, and the fourth switch T4 close. After the second switch T2, the third switch T3, and the fourth switch T4 close, the second gate signal line Gate2 provides a second control signal, opening the fifth switch T5. This connects the first capacitor C1 and the second capacitor C2 in series, causing the charge on the first plate of the second capacitor C2 to flow to the second plate of the first capacitor C1, changing the voltage on the first plate of the first capacitor C1. This generates either the first control signal or the second control signal, controlling the opening and closing of the first switch T1 to control the output voltage.

[0038] The output voltage control circuit provided in this application can be applied to electronic paper display panels. Based on the above embodiments, in one embodiment of this application, such as... Figure 5 As shown, the display panel includes an electrophoretic film 300. The voltage of the first data voltage signal is greater than the voltage of the second data voltage signal. The first data voltage signal is the first driving voltage DH of the electrophoretic film 300, and the second data voltage signal is the second driving voltage DL of the electrophoretic film 300. That is, the first data voltage signal is the high driving voltage DH of the electrophoretic film 300, and the second data voltage signal is the low driving voltage DL of the electrophoretic film 300. It should be noted that the output voltage control circuit provided in this application can also be applied to other display panels that need to control the data voltage input to the pixel electrodes. Furthermore, this output voltage control can also be used in other devices that need to control the input voltage; this application does not limit this application.

[0039] Based on the above embodiments, in one embodiment of this application, the voltage value of the reference voltage signal provided by the reference voltage signal line V1 is equal to the voltage value of the second data voltage signal provided by the data signal line Source. A third control signal is used to open the first switch, and a fourth control signal is used to close the first switch. Specifically, in this embodiment, since the voltage value of the reference voltage signal provided by the reference voltage signal line V1 is equal to the voltage value of the second data voltage signal provided by the data signal line Source, when the data signal line Source provides the first data voltage signal, the two plates of the first capacitor C1 and the second capacitor C2 are respectively charged with the voltage values ​​of the first data voltage signal and the second data voltage signal. The voltage difference between the two plates is the voltage difference between the first data voltage signal and the second data voltage signal. When the fifth switch T5 is opened, the voltage of the second plate of the first capacitor C1 changes, generating a first control signal. The voltage value of the first control signal is 2DH-DL, which is greater than the threshold voltage VGH of the first switch T1. The first switch is opened, and the output voltage signal provided by the output voltage signal line is transmitted to the output port for output. The voltage value of the output voltage signal is equal to the voltage value of the first data voltage signal. When the data signal line Source provides the second data voltage signal line, both plates of the first capacitor C1 and the second capacitor C2 are charged with the voltage value of the second data signal voltage. As a result, the voltages of the two plates of the first capacitor C1 and the second capacitor C2 are equal, and the voltage difference is 0. The fifth switch T5 is opened, and the voltage of the first plate of the first capacitor C1 remains unchanged, which is the voltage value DL of the second data signal voltage. This is less than the threshold voltage VGH of the first switch T1. The first switch T1 is closed, and the output voltage signal provided by the output voltage signal line cannot be transmitted to the output port. The output voltage control circuit has no voltage output.

[0040] Furthermore, in this embodiment, the voltage value of the first control signal is 2DH-DL, which is greater than the threshold voltage VGH of the first switch T1, and the difference between the two is relatively large. This can cover the fluctuations and drift of the threshold voltage of the first switch T1, avoiding abnormal operation of the first switch T1. It also prevents voltage drop during data voltage signal transmission, resulting in better stability of the output voltage control circuit and improving the reliability of the display panel. Additionally, when the first switch is open, the control terminal of the first switch T1 receives the first control signal, and the input terminal receives the output voltage signal. This causes the voltage input to the gate and source of the first switch T1 to differ, suppressing leakage current in the first switch T1.

[0041] Based on the above embodiments, in one embodiment of this application, such as Figure 6 As shown, Figure 6This application provides a schematic diagram of the output voltage control circuit. The output voltage signal line V2 is a pulse signal line, meaning the output voltage signal is a pulse signal. The output voltage signal line V2 is electrically connected to the second gate signal line Gate2, meaning the voltage signal on the output voltage signal line V2 is the same as the signal on the second gate signal line Gate2, which is the threshold voltage VGH of the fifth switch T5. In this embodiment, when the data signal line Source provides the first data voltage signal, the voltage processing unit 100 generates a first control signal to open the first switch. That is, when the data signal line Source provides the first data voltage signal, the output voltage signal on the output voltage signal line is output. It is known that the output voltage signal provided by the output voltage signal line V2 should be the same as the voltage of the data voltage signal provided by the data signal line Source; therefore, the output voltage signal provided by the output voltage signal line V2 should be the first data voltage signal DH. However, the output voltage of this output voltage control circuit is used to provide data voltage to the pixel electrodes in the display panel. A higher data voltage signal is beneficial to the display operation of the display pixels. Furthermore, the threshold voltage VGH of the switching transistor is usually greater than the driving high voltage DH of the electrophoretic film, which is greater than the voltage of the first data voltage signal. Therefore, when the output voltage signal provided by the output voltage signal line V2 should be the same as the first data voltage signal DH, the output voltage signal line V2 can be electrically connected to the second gate signal line Gate2 to provide a relatively higher output voltage to the pixel electrodes, which is beneficial to the display operation of the display pixels in the display panel.

[0042] Based on the display panel being an electronic paper display panel, in another embodiment of this application, the voltage value of the reference voltage signal provided by the reference voltage signal line V1 is equal to the voltage value of the first data voltage signal provided by the data signal line Source. The first control signal is used to turn off the first switch T1, and the second control signal is used to turn on the first switch T1. Specifically, since the voltage value of the reference voltage signal provided by the reference voltage signal line V1 is equal to the voltage value of the first data voltage signal provided by the data signal line Source, when the data signal line Source provides the first data voltage signal, both plates of the first capacitor C1 and the second capacitor C2 are charged with the voltage of the first data voltage signal. Consequently, the voltages of the two plates of the first capacitor C1 and the second capacitor C2 are equal, and the voltage difference is 0. The fifth switch T5 is turned on, and the voltage of the first plate of the first capacitor C1 remains unchanged, which is the voltage value DH of the first data signal voltage, which is less than the threshold voltage VGL of the first switch T1. The first switch T1 is turned off, and the output voltage signal provided by the output voltage signal line cannot be transmitted to the output port. The output voltage control circuit has no voltage output. When the data signal line Source provides the second data voltage signal, the two plates of the first capacitor C1 and the second capacitor C2 are charged with the voltage values ​​of the second data voltage signal and the first data signal voltage, respectively. The voltage difference between the two plates is the voltage difference between the first data signal voltage and the second data voltage signal. When the fifth switch T5 is opened, the voltage of the second plate of the first capacitor C1 changes, generating a second control signal. The voltage value of the second control signal is 2DL-DH, which is greater than the threshold voltage VGH of the first switch T1. The first switch is opened, and the output voltage signal provided by the output voltage signal line is transmitted to the output port for output.

[0043] Furthermore, at this time, the voltage value of the second control signal is 2DL-DH, which is greater than the threshold voltage VGH of the first switch T1, and the difference between the two is relatively large. This can cover the fluctuations and drift of the threshold voltage of the first switch T1, preventing the first switch T1 from malfunctioning. It also avoids voltage drop during data voltage signal transmission, resulting in better stability of the output voltage control circuit and improving the reliability of the display panel. Additionally, when the first switch is open, the control terminal of the first switch T1 receives the second control signal, and the input terminal receives the output voltage signal. This causes the voltage input to the gate and source of the first switch T1 to differ, suppressing the leakage current of the first switch T1.

[0044] Optionally, all switches from the first switch T1 to the fifth switch T5 are MOSFETs with the same channel type; that is, all switches from the first switch T1 to the fifth switch T5 are NMOS transistors, or all switches from the first switch T1 to the fifth switch T5 are PMOS transistors. It should be noted that the above embodiments are described based on the premise that the switches are NMOS transistors. The circuit structure remains unchanged when the switches are PMOS transistors; only the switching transistors are replaced with PMOS transistors, and the working principle is the same. Therefore, the working principle and process of the output voltage control circuit when the switching transistors are PMOS transistors will not be described in detail here.

[0045] Based on any of the above embodiments, in one embodiment of this application, the width-to-length ratios of the first switch T1 to the fifth switch T5 are equal, and the capacitance values ​​of the first capacitor C1 and the second capacitor C2 are equal. Optionally, in a specific embodiment of this application, the width-to-length ratios of the first switch to the fifth switch are the same, all being 4μm / 6μm, and the capacitance values ​​of the first capacitor and the second capacitor are equal, all being 300fF. The above values ​​are only values ​​for a specific embodiment and are not limitations on the above width-to-length ratios and capacitance values. In other specific embodiments of this application, the above values ​​can also be other values, depending on the specific circumstances.

[0046] Accordingly, this application also provides a control method for an output voltage control circuit, wherein the output voltage control circuit is the output voltage control circuit described in the above embodiments, such as... Figure 2As shown, the output voltage control circuit includes: a voltage processing unit 100, a first switch T1, a data signal line Source, a reference voltage signal line V1, and an output voltage signal line V2. The output voltage signal line V2 provides the output voltage. The input terminal of the first switch T1 is electrically connected to the output voltage signal line V2, and the output terminal of the first switch T1 is electrically connected to the output port of the transmission voltage control circuit. This output port is electrically connected to the pixel electrode to provide voltage to the pixel electrode. The data signal line Source provides a data voltage signal, which includes a first data voltage signal and a second data voltage signal. The reference voltage signal line V1 provides a reference voltage signal. The voltage processing unit 100 is electrically connected to both the data signal line Source and the reference voltage signal V1, receives the data voltage signal and the reference voltage signal, and generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal. The voltage processing unit 100 is also electrically connected to the control terminal of the first switch T1. Specifically, the output port of the voltage processing unit 100 is electrically connected to the first switch T1 so as to open or close the first switch T1 by means of a first control signal and a second control signal. That is, the first switch T1 is opened by means of the first control signal and the first switch T1 is closed by means of the second control signal, or the first switch T1 is closed by means of the first control signal and the first switch T1 is opened by means of the second control signal.

[0047] Based on the above, such as Figure 7 As shown, the control method includes:

[0048] S1: A data voltage signal is provided to the voltage processing unit 100 using the data signal line Source. The data voltage signal includes a first data voltage signal and a second data voltage signal.

[0049] S2: A reference voltage signal is provided to the voltage processing unit 100 using the reference voltage signal line V1, so that the voltage processing unit 100 generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal, so as to turn the first switch on or off.

[0050] S3: The output voltage signal is provided by the output voltage signal line V2. When the first switch is turned on, the output voltage signal is output.

[0051] Specifically, in this control method, a reference voltage signal is provided to the voltage processing unit 100 using a reference voltage signal line V1. The voltage processing unit 100 generates a first control signal based on the first data voltage signal and the reference voltage signal. When the data voltage signal is a second data voltage signal, the voltage processing unit generates a second control signal based on the second data voltage signal and the reference voltage signal. The first and second control signals open or close the first switch T1. Furthermore, the input terminal of the first switch T1 is electrically connected to the output voltage signal line V2. When the first switch T1 is open, the output voltage provided by the output voltage signal line V2 is transmitted to the output port of the output voltage control circuit. When the second switch is closed, the output voltage signal cannot be transmitted to the output port of the output voltage control circuit. Since the reference voltage signal line V1 is a constant voltage signal line, the signal voltage value it provides remains unchanged. Therefore, the first control signal and the second control signal actually change according to the different data voltage signals. Thus, this control method can generate different control signals according to the different data voltage signals provided by the data signal line Source, thereby controlling the output voltage and then controlling the data voltage input to the pixel electrode.

[0052] Based on the above embodiments, in one embodiment of this application, such as Figure 3As shown, the voltage processing unit 100 includes: a second switch T2, a third switch T3, a fourth switch T4, a fifth switch T5, a first capacitor C1, a second capacitor C2, a first gate signal line Gate1, and a second gate signal line Gate2. The data signal line Source provides a first data voltage signal and a second data voltage signal, where the first data voltage signal is the driving high voltage DH of the electrophoretic membrane, and the second data voltage signal is the driving low voltage DL of the electrophoretic membrane. Based on this, the control method of the output voltage control circuit provided in this application is described in detail. First, the data signal line Source provides the data voltage signal, and simultaneously, the first gate signal line Gate1 provides the third control signal. The second switch T2, the third switch T3, and the fourth switch T4 are turned on, charging the two plates of the first capacitor C1 and the second capacitor C2 with the voltages of the data voltage signal and the reference voltage signal, respectively. Once charging is complete, the pulse of the first control signal ends, and the second switch T2, the third switch T3, and the fourth switch T4 are turned off. After the second switch T2, the third switch T3, and the fourth switch T4 are closed, a fourth control signal is provided using the second gate signal line Gate2 to open the fifth switch T5, electrically connecting the first capacitor C1 and the second capacitor C2. If the data signal line Source provides the first data voltage signal DH, after the fifth switch T5 is opened, the voltage of the first plate of the first capacitor C1 becomes 2DH-DL, the first switch T1 opens, and the output voltage control circuit outputs a voltage signal. If the data signal line Source provides the second data voltage signal DL, after the fifth switch T5 is opened, the voltage of the first plate of the first capacitor C1 remains unchanged at DL, the first switch closes, and the output voltage control signal has no voltage output.

[0053] In summary, this application provides an output voltage control circuit and control method. The output voltage control circuit includes: a voltage processing unit, a first switch, a data signal line, a reference voltage signal line, and an output voltage signal line. The output voltage signal line provides the output voltage. The input terminal of the first switch is electrically connected to the output voltage signal line, and the output terminal of the first switch is electrically connected to the output port of the transmission voltage control circuit. The data signal line provides a data voltage signal, including a first data voltage signal and a second data voltage signal. The reference voltage signal line provides a reference voltage signal. The voltage processing unit receives the data voltage signal and the reference voltage signal, generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal. The voltage processing unit is also electrically connected to the control terminal of the first switch, and opens or closes the first switch using the first and second control signals. Therefore, this output voltage control circuit can generate different control signals according to the different data voltage signals provided by the data signal line Source, thereby controlling the output voltage and ultimately controlling the data voltage input to the pixel electrode.

[0054] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical areas between embodiments can be referred to interchangeably. For the apparatuses disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant details can be found in the description of the method area.

[0055] It should be noted that, in the description of this application, the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0056] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An output voltage control circuit, characterized by comprising: The output voltage control circuit applied to a display panel comprises a voltage processing unit, a first switch, a data signal line, a reference voltage signal line and an output voltage signal line. The output voltage signal line is used for providing an output voltage signal, an input end of the first switch is electrically connected with the output voltage signal line, and an output end of the first switch is electrically connected with an output port of the output voltage control circuit; the data signal line is used for providing a data voltage signal, the data voltage signal comprises a first data voltage signal and a second data voltage signal; the reference voltage signal line is a constant voltage signal line and is used for providing a reference voltage signal; wherein a voltage value of the reference voltage signal is equal to a voltage value of the first data voltage signal, or a voltage value of the reference voltage signal is equal to a voltage value of the second data voltage signal. The voltage processing unit is electrically connected with the data signal line and the reference voltage signal line respectively, receives the data voltage signal and the reference voltage signal, generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal. The voltage processing unit is also electrically connected with a control end of the first switch, opens or closes the first switch through the first control signal and the second control signal, and the output voltage signal is the same as the data voltage signal provided by the data signal line.

2. The output voltage control circuit of claim 1, wherein, The voltage processing unit comprises a second switch, a third switch, a fourth switch, a fifth switch, a first capacitor, a second capacitor, a first gate signal line and a second gate signal line. Control ends of the second switch, the third switch and the fourth switch are electrically connected with the first gate signal line, a control end of the fifth switch is electrically connected with the second gate signal line; input ends of the second switch and the third switch are electrically connected with the data signal line, and an input end of the fourth switch is electrically connected with the reference voltage signal line. A first pole plate of the first capacitor is electrically connected with an output end of the second switch, a second pole plate of the first capacitor is electrically connected with an output end of the fifth switch and an output end of the fourth switch; a first pole plate of the second capacitor is electrically connected with an output end of the third switch and an input end of the fifth switch, and a second pole plate of the second capacitor is electrically connected with the reference voltage signal line. The first pole plate of the first capacitor is also electrically connected with a first node, the first node is an output end of the output voltage control circuit, and a control end of the first switch is electrically connected with the first node.

3. The output voltage control circuit of claim 2, wherein, The data signal line, the first gate signal line and the second gate signal line are all pulse signal lines, and the reference voltage signal line is a constant voltage signal line. The first gate signal line provides a third control signal to open the second switch, the third switch and the fourth switch when the data signal line provides the data voltage signal, and the second gate signal line provides a fourth control signal to open the fifth switch after the second switch, the third switch and the fourth switch are closed.

4. The output voltage control circuit of claim 3, wherein The display panel comprises an electrophoretic film, the voltage of the first data voltage signal is greater than the voltage of the second data voltage signal, the first data voltage signal is a first driving voltage of the electrophoretic film, and the second data voltage signal is a second driving voltage of the electrophoretic film.

5. The output voltage control circuit of claim 4, wherein, The voltage value of the reference voltage signal is equal to the voltage value of the second data voltage signal, the first control signal is used to open the first switch, and the second control signal is used to close the first switch.

6. The output voltage control circuit of claim 5, wherein, The output voltage signal line is a pulse signal line, and the output voltage signal line is electrically connected with the second gate signal line.

7. The output voltage control circuit of claim 4, wherein, The voltage value of the reference voltage signal is equal to the voltage value of the first data voltage signal, the first control signal is used to close the first switch, and the second control signal is used to open the first switch.

8. The output voltage control circuit of claim 2, wherein, The first switch to the fifth switch are MOS tubes, and the channel types are the same.

9. The output voltage control circuit of claim 2, wherein, The width-length ratios of the first switch to the fifth switch are equal, and the capacitance values of the first capacitor and the second capacitor are equal.

10. A control method of an output voltage control circuit, characterized by, The output voltage control circuit is applied to a display panel, and the output voltage control circuit is the output voltage control circuit of any one of claims 1-9, and the control method comprises: providing a data voltage signal to the voltage processing unit by using the data signal line, the data voltage signal comprising a first data voltage signal and a second data voltage signal; providing a reference voltage signal to the voltage processing unit by using the reference voltage signal line, so that the voltage processing unit generates a first control signal based on the first data voltage signal and the reference voltage signal, and generates a second control signal based on the second data voltage signal and the reference voltage signal, to open or close the first switch; providing an output voltage signal by using the output voltage signal line, and outputting the output voltage signal when the first switch is opened.

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