Display driving device and electronic equipment

Abstract

The utility model discloses a display driving device and electronic equipment, and belongs to the technical field of electronic equipment. The display driving device comprises a first sampling and holding circuit, a second sampling and holding circuit, a third sampling and holding circuit and a fourth sampling and holding circuit, the first end of the first amplifier is connected with the first sampling hold circuit; the first end of the first switch piece is connected with the first amplifier; the first end of the second amplifier is used for receiving a data signal, and the second end of the second amplifier is connected with the second end of the first switch piece; the first end of the second sampling and holding circuit is used for receiving a data signal; the first end of the third amplifier is connected with the second sampling hold circuit; the first end of the second switch piece is connected with the second end of the second amplifier, and the second end of the second switch piece is connected with the second end of the third amplifier.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment, and specifically relates to a display driving device and an electronic device. Background Art

[0002] As the smartphone market becomes increasingly saturated and price competition intensifies, value engineering becomes increasingly important. De-Mux (1:2 Mux, two-channel multiplexing) technology can reduce the number of driver IC channels by half, thereby reducing driver IC costs.

[0003] In related technologies, in order to reduce the delay caused by on-resistance, the switching devices in the driver IC (Integrated Circuit Chip) are selected to be larger in size, which leads to increased power consumption. Moreover, when the switching devices are turned on, the corresponding display module signal is in a floating state. Therefore, there is a problem that the driver IC has poor anti-EMI (Electromagnetic Interference) / EMS (Electro Magnetic Susceptibility) capabilities. Utility Model Content

[0004] The present application aims to provide a display driving device and an electronic device, which can solve the problem of poor EMI / EMS resistance of the driving device in the related art.

[0005] In a first aspect, an embodiment of the present application proposes a display driving device, which is connected to a display module and is used to transmit a data signal to the display module. The display driving device includes: a first sampling and holding circuit, wherein the first end of the first sampling and holding circuit is used to receive the data signal; a first amplifier, wherein the first end of the first amplifier is connected to the first sampling and holding circuit; a first switch element, wherein the first end of the first switch element is connected to the first amplifier; a second amplifier, wherein the first end of the second amplifier is used to receive the data signal, and the second end of the second amplifier is connected to the second end of the first switch element; a second sampling and holding circuit, wherein the first end of the second sampling and holding circuit is used to receive the data signal; a third amplifier, wherein the first end of the third amplifier is connected to the second sampling and holding circuit; a second switch element, wherein the first end of the second switch element is connected to the second end of the second amplifier, and the second end of the second switch element is connected to the second end of the third amplifier; wherein the first end of the first switch element and the first end of the second switch element are used to transmit the data signal to the display module.

[0006] In a second aspect, an embodiment of the present application provides an electronic device, comprising: a display driver device and a display module, wherein the display module is connected to the display driver device, wherein the display driver device comprises the display driver device in the first aspect above.

[0007] In an embodiment of the present application, a first amplifier, a second amplifier, and a third amplifier connected in parallel are provided in a display driving device, and a first switch element is provided between the first amplifier and the second amplifier, and a second switch element is provided between the second amplifier and the third amplifier. By controlling the on-off state of the first switch element and the second switch element, the first end of the first switch element and the first end of the second switch element can both maintain the output of the data signal, thereby avoiding the data signal transmitted to the display module being in a floating state, thereby avoiding the EMI / EMS effect caused by the floating state path on the signal antenna, improving the EMI / EMS resistance of the driving device, and reducing the impact of EMI / EMS on the display effect of the display module.

[0008] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] Figure 1 One of the circuit diagrams of the display driving device provided in some embodiments of the present application is shown;

[0011] Figure 2 shows a second circuit diagram of a display driving device provided in some embodiments of the present application;

[0012] Figure 3 A circuit diagram of a sample-and-hold circuit provided in some embodiments of the present application is shown;

[0013] Figure 4 Schematic diagram showing output of control signals and data signals of a display driving device provided in some embodiments of the present application;

[0014] Figure 5 shows a circuit diagram of a control module provided in some embodiments of the present application;

[0015] Figure 6 shows a schematic diagram of signal timing provided in some embodiments of the present application;

[0016] Figure 7 The third circuit diagram of the display driving device provided in some embodiments of the present application is shown;

[0017] Figure 8 A circuit diagram of an electronic device provided in some embodiments of the present application is shown.

[0018] Reference numerals:

[0019] 100 display driver device, S / H1 first sampling and holding circuit, AMP1 first amplifier, Mux1 first switch element, AMP2 second amplifier, S / H2 second sampling and holding circuit, Mux2 second switch element, AMP3 third amplifier, SW1 third switch element, C1 first capacitor, SW2 fourth switch element, C2 second capacitor, C3 third capacitor, SW3 sixth switch element, 110 control module, 111 NAND gate circuit, 112 first NOR gate circuit, 113 second NOR gate circuit, 114 first delay circuit, 115 second delay circuit, 120 controller, S / H3 third sampling and holding circuit, AMP4 fourth amplifier, Mux3 fifth switch element, 200 electronic device, 210 display module, 211 first pixel row, 212 second pixel row. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] The following combination Figures 1 to 8 A display driving device and an electronic device according to embodiments of the present application are described.

[0025] In some embodiments of the present application, a display driver device is provided. The display driver device is connected to a display module and is used to transmit a data signal to the display module. Figure 1 One of the circuit diagrams of the display driving device provided in some embodiments of the present application is shown in FIG. Figure 1 As shown, the display driving device 100 includes: a first sampling and holding circuit S / H1, wherein a first end of the first sampling and holding circuit S / H1 is used to receive a data signal; a first amplifier AMP1, wherein a first end of the first amplifier AMP1 is connected to the first sampling and holding circuit S / H1; a first switch element Mux1, wherein a first end of the first switch element Mux1 is connected to the first amplifier AMP1; a second amplifier AMP2, wherein a first end of the second amplifier AMP2 is used to receive a data signal, and a second end of the second amplifier AMP2 is connected to the second end of the first switch element Mux1; a second sampling and holding circuit S / H2, wherein a first end of the second sampling and holding circuit S / H2 is used to receive a data signal; a third amplifier AMP3, wherein a first end of the third amplifier AMP3 is connected to the second sampling and holding circuit S / H2; a second switch element Mux2, wherein a first end of the second switch element Mux2 is connected to a second end of the second amplifier AMP2, and a second end of the second switch element Mux2 is connected to a second end of the third amplifier AMP3; wherein the first end of the first switch element Mux1 and the first end of the second switch element Mux2 are used to transmit a data signal to the display module.

[0026] In the embodiment of the present application, the display driver device 100 includes a first amplifier AMP1, a second amplifier AMP2, and a third amplifier AMP3. A first sample-and-hold circuit S / H1 is connected in series to the first terminal of the first amplifier AMP1, and a second sample-and-hold circuit S / H2 is connected in series to the first terminal of the third amplifier AMP3. The first, second, and third amplifiers AMP1, AMP2, and AMP3 are connected in parallel. After a data signal is transmitted to the first amplifier AMP1 via the first sample-and-hold circuit S / H1 for amplification, it is transmitted to the display module via the output terminal of the first amplifier AMP1. After a data signal is transmitted to the third amplifier AMP3 via the second sample-and-hold circuit S / H2 for amplification, it is transmitted to the display module via the output terminal of the third amplifier AMP3. A first switch element Mux1 is connected between the output terminal of the second amplifier AMP2 and the output terminal of the first amplifier AMP1, and a second switch element Mux2 is connected between the output terminal of the second amplifier AMP2 and the output terminal of the third amplifier AMP3. In other words, the first terminal of the first switch element Mux1 and the first terminal of the second switch element Mux2 both serve as signal output terminals of the display driver device 100. By controlling the on / off states of the first switch element Mux1 and the second switch element Mux2, it is possible to select to use only the first amplifier AMP1 to transmit data signals to the display module, or to select to use the first amplifier AMP1 and the second amplifier AMP2, or to select to use the second amplifier AMP2 and the third amplifier AMP3 to transmit data signals to the display module.

[0027] The specific workflow is as follows: Because an amplifier with greater driving capability is required to drive the data signal during the initial phase of writing input to a pixel in the display module, an amplifier with greater driving capability is not required during the stable phase of writing input to the pixel in the display module. When the first switch element Mux1 is on and the second switch element Mux2 is off, the first sample-and-hold circuit S / H1 connected to the first switch element Mux1 stores the input data signal. The first switch element Mux1 simultaneously connects to the first amplifier AMP1 and the second amplifier AMP2, enabling rapid response to the data signal required to drive the display module pixel. When the second switch element Mux2 is on and the first switch element Mux1 is off, the second sample-and-hold circuit S / H2 connected to the second switch element Mux2 stores the input data signal. The second switch element Mux2 simultaneously connects to the second amplifier AMP2 and the third amplifier AMP3, enabling rapid response to the data signal required to drive the display module pixel. At this point, the first switch element Mux1 is connected only to the first amplifier AMP1, maintaining the data signal required by the display module solely through the first amplifier AMP1. By controlling the first switch element Mux1 and the second switch element Mux2 to be alternately turned on, the first end of the first switch element Mux1 and the first end of the second switch element Mux2 can both maintain the output of the data signal, and when the pixel of the display module is in the maintenance stage, the second amplifier AMP2 can be disconnected by the first switch element Mux1 or the second switch element Mux2, and the data signal can be maintained only by the first amplifier AMP1 or the second amplifier AMP2.

[0028] Exemplarily, the first switch element Mux1 and the second switch element Mux2 may be multiplexers.

[0029] In an embodiment of the present application, a first amplifier AMP1, a second amplifier AMP2, and a third amplifier AMP3 connected in parallel are provided in the display driving device 100, and a first switch element Mux1 is provided between the first amplifier AMP1 and the second amplifier AMP2, and a second switch element Mux2 is provided between the second amplifier AMP2 and the third amplifier AMP3. By controlling the on-off state of the first switch element Mux1 and the second switch element Mux2, the first end of the first switch element Mux1 and the first end of the second switch element Mux2 can maintain the output of the data signal, thereby avoiding the data signal transmitted to the display module being in a floating state, thereby avoiding the EMI / EMS impact of the floating state path on the signal antenna, improving the anti-EMI / EMS capability of the driving device, and reducing the impact of EMI / EMS on the display effect of the display module.

[0030] Figure 2 FIG. 2 shows a second circuit diagram of a display driving device provided in some embodiments of the present application. Figure 2 As shown, in some embodiments of the present application, the first sampling and holding circuit S / H1 includes: a third switch element SW1, a first end of the third switch element SW1 is used to receive a data signal, and a second end of the third switch element SW1 is used to output the data signal; a first capacitor C1, a first end of the first capacitor C1 is connected to the second end of the third switch element SW1, and the second end of the first capacitor C1 is grounded; the second sampling and holding circuit S / H2 includes: a fourth switch element SW2, a first end of the fourth switch element SW2 is used to receive a data signal, and the second end of the fourth switch element SW2 is used to output the data signal; a second capacitor C2, a first end of the second capacitor C2 is connected to the second end of the fourth switch element SW2, and the second end of the second capacitor C2 is grounded.

[0031] In the embodiment of the present application, both the first sampling and holding circuit S / H1 and the second sampling and holding circuit S / H2 include switches and capacitors. Specifically, the first sampling and holding circuit S / H1 includes a third switch SW1 and a first capacitor C1. The first end of the third switch SW1 is the input end of the first sampling and holding circuit S / H1, the second end of the third switch SW1 is the output end of the first sampling and holding circuit S / H1, the second end of the third switch SW1 is connected to the first end of the first switch Mux1, the first end of the first capacitor C1 is connected to the second end of the third switch SW1, and the second end of the first capacitor C1 is grounded. The second sampling and holding circuit S / H2 includes a fourth switch SW2 and a second capacitor C2. The first end of the fourth switch SW2 is the input end of the second sampling and holding circuit S / H2, the second end of the fourth switch SW2 is the output end of the second sampling and holding circuit S / H2, the second end of the fourth switch SW2 is connected to the first end of the second switch Mux2, the first end of the second capacitor C2 is connected to the second end of the fourth switch SW2, and the second end of the second capacitor C2 is grounded.

[0032] Figure 3 FIG. 4 shows a circuit diagram of a sample-and-hold circuit provided in some embodiments of the present application, such as Figure 3 As shown, the sampling and holding circuit S / H includes a third capacitor C3 and a sixth switch element SW3. The first end of the sixth switch element SW3 is the input end of the data signal, and the second end of the sixth switch element SW3 is the output end of the data signal. The third capacitor C3 is connected between the second end of the sixth switch element SW3 and the ground end. The third capacitor C3 can store data when the on-off switch is turned on, and discharge to output the stored data signal when the on-off switch is turned off.

[0033] Specifically, the first sample-and-hold circuit S / H1 stores the received data signal via the first capacitor C1, and the second sample-and-hold circuit S / H2 stores the received data signal via the second capacitor C2. When the third switch SW1 is on, the data signal is transmitted to the first capacitor C1 for storage and is transmitted externally through the second end of the third switch SW1. When the third switch SW1 is off, the first capacitor C1 discharges, and the data signal stored in the first capacitor C1 is transmitted externally through the second end of the third switch SW1. The data signal stored in the first capacitor C1 is maintained until the next time the third switch SW1 is turned on. When the fourth switch SW2 is on, the data signal is transmitted to the second capacitor C2 for storage and is transmitted externally through the second end of the fourth switch SW2. When the fourth switch SW2 is off, the second capacitor C2 discharges, and the data signal stored in the second capacitor C2 is transmitted externally through the second end of the fourth switch SW2. The data signal stored in the second capacitor C2 is maintained until the next time the third switch SW1 is turned on.

[0034] In the embodiment of the present application, a third switch element SW1 and a first capacitor C1 are provided in the first sampling and holding circuit S / H1, and a second capacitor C2 of a fourth switch element SW2 is provided in the second sampling and holding circuit S / H2. By controlling the on-off states of the third switch element SW1 and the fourth switch element SW2, the charge and discharge states of the first capacitor C1 and the second capacitor C2 are controlled. When the first switch element Mux1 is disconnected, the data signal is continuously transmitted to the display module through the first capacitor C1, and when the second switch element Mux2 is disconnected, the data signal is continuously transmitted to the display module through the second capacitor C2. This further avoids the data signal transmitted to the display module being in a floating state, and improves the display effect of the display module.

[0035] In some embodiments of the present application, the control terminal of the first switch element Mux1 is connected to the control terminal of the third switch element SW1, wherein the on-off state of the first switch element Mux1 matches the on-off state of the third switch element SW1;

[0036] The control end of the second switch element Mux2 is connected to the control end of the fourth switch element SW2 , wherein the on-off state of the second switch element Mux2 matches the on-off state of the fourth switch element SW2 .

[0037] In the embodiment of the present application, the control end of the first switch element Mux1 is connected to the control end of the third switch element SW1, that is, the first switch element Mux1 and the third switch element SW1 can synchronously receive the on-off control signal, and the first switch element Mux1 and the third switch element SW1 can be synchronously turned on or off in response to the on-off control signal.

[0038] Specifically, when the first switch element Mux1 is controlled to be turned on, the third switch element SW1 is also controlled to be turned on synchronously. The data signal is transmitted to the first capacitor C1 and the first amplifier AMP1 through the third switch element SW1. The first capacitor C1 stores the data signal. The data signal amplified by the second amplifier AMP2 and the data signal amplified by the first amplifier AMP1 are then transmitted to the display module through the first end of the first switch element Mux1. When the first switch element Mux1 is controlled to be turned off, the third switch element SW1 is also controlled to be turned off synchronously. The data signal stored in the first capacitor C1 is amplified by the first amplifier AMP1 and then transmitted to the display module through the first end of the first switch element Mux1.

[0039] In an embodiment of the present application, the control end of the second switch element Mux2 is connected to the control end of the fourth switch element SW2, that is, the second switch element Mux2 and the fourth switch element SW2 can synchronously receive the on-off control signal, and the second switch element Mux2 and the fourth switch element SW2 can be synchronously turned on or off in response to the on-off control signal.

[0040] Specifically, when the second switch element Mux2 is controlled to be turned on, the fourth switch element SW2 is also controlled to be turned on synchronously. The data signal is transmitted to the second capacitor C2 and the third amplifier AMP3 through the fourth switch element SW2. The second capacitor C2 stores the data signal. The data signal amplified by the second amplifier AMP2 and the data signal amplified by the third amplifier AMP3 are transmitted to the display module through the first end of the second switch element Mux2. When the second switch element Mux2 is controlled to be turned off, the third switch element SW1 is also controlled to be turned off synchronously. The data signal stored in the second capacitor C2 is amplified by the third amplifier AMP3 and transmitted to the display module through the first end of the second switch element Mux2.

[0041] In the embodiment of the present application, the control end of the first switch element Mux1 is connected to the control end of the third switch element SW1, and the control end of the second switch element Mux2 is connected to the control end of the fourth switch element SW2, so that the on-off states of the first switch element Mux1 and the third switch element SW1, as well as the on-off states of the second switch element Mux2 and the fourth switch element SW2 can be synchronously controlled, thereby ensuring that the first sample-and-hold circuit S / H1 samples and stores the data signal when the first switch element Mux1 is turned on, and that the second sample-and-hold circuit S / H2 samples and stores the data signal when the second switch element Mux2 is turned on.

[0042] like Figure 1As shown, in some embodiments of the present application, the display driving device 100 further includes: a control module 110, an input end of the control module 110 being used to receive a control signal, a first output end of the control module 110 being connected to the control end of the first switch element Mux1, and a second output end of the control module 110 being connected to the control end of the second switch element Mux2; wherein the control module 110 is used to output on-off signals with opposite phases through the first output end and the second output end to control the on-off state of the first switch element Mux1 and the second switch element Mux2.

[0043] In the embodiment of the present application, a control module 110 is further provided in the display driving device 100. The control module 110 includes an input end, a first output end, and a second output end. The input end is used to receive a control signal. The control module 110 can convert the control signal into two on-off signals with opposite phases, and transmit the on-off signals with opposite phases to the first switch element Mux1 and the second switch element Mux2 through the first output end and the second output end, respectively, to control the on-off state of the first switch element Mux1 and the second switch element Mux2.

[0044] It should be noted that the control module 110 includes a logic gate circuit and a delay circuit. Through the logic gate circuit and the delay circuit, the input control signal can be converted into two on-off signals with opposite phases, and the on-off states of the first switch element Mux1 and the second switch element Mux2 can be controlled respectively through the two on-off signals with opposite phases.

[0045] Figure 4 FIG. 1 shows a schematic diagram of outputting control signals and data signals of a display driving device provided in some embodiments of the present application, such as FIG. Figure 4 As shown, the controller 120 of the display driving device 100 transmits the received data signal to the first sample and hold circuit S / H1 , the second sample and hold circuit S / H2 and the third amplifier AMP3 , and transmits the control signal to the control module 110 .

[0046] In the embodiment of the present application, a control module 110 is provided in the display driving device 100, and the control module 110 converts a received control signal into two on-off signals with opposite phases, and transmits the two on-off signals with opposite phases to the first switch element Mux1 and the second switch element Mux2, respectively, so as to synchronously control the on-off states of the first switch element Mux1 and the second switch element Mux2, thereby preventing the first switch element Mux1 and the second switch element Mux2 from being turned on and off at the same time, thereby improving the stability and accuracy of the on-off state control of the first switch element Mux1 and the second switch element Mux2.

[0047] Figure 5 FIG. 4 shows a circuit diagram of a control module provided in some embodiments of the present application, such as Figure 5As shown, in some embodiments of the present application, the on-off signal includes a first on-off signal and a second on-off signal, and the control module 110 includes: a NAND gate circuit 111, the input end of the NAND gate circuit 111 is used to receive the control signal; a first NOR gate circuit 112, the first input end of the first NOR gate circuit 112 is connected to the input end of the NAND gate circuit 111; a second NOR gate circuit 113, the first input end of the second NOR gate circuit 113 is connected to the output end of the NAND gate circuit 111; a first delay circuit 114, the first delay circuit 115 is connected to the output end of the NAND gate circuit 111; The input end of the circuit 114 is connected to the output end of the first NOR gate circuit 112, and the output end of the first delay circuit 114 is connected to the second input end of the second NOR gate circuit 113. The first delay circuit 114 is used to output the second on-off signal; the second delay circuit 115, the input end of the second delay circuit 115 is connected to the output end of the second NOR gate circuit 113, and the output end of the second delay circuit 115 is connected to the second input end of the first NOR gate circuit 112. The second delay circuit 115 is used to output the first on-off signal.

[0048] In an embodiment of the present application, the on-off signal includes a first on-off signal and a second on-off signal. The first on-off signal is transmitted to the first switch element Mux1 to control the on-off state of the first switch element Mux1, and the second on-off signal is transmitted to the second switch element Mux2 to control the on-off state of the second switch element Mux2.

[0049] Specifically, the control signal input to the control module 110 is transmitted to the NAND gate circuit 111 and the first NOR gate circuit 112 respectively. The control signal passing through the NAND gate circuit 111 is transmitted to the second NOR gate circuit 113. The control signal passing through the first NOR gate circuit 112 forms a second on-off signal through the first delay circuit 114 and is transmitted to the second switch element Mux2. The control signal passing through the second NOR gate circuit 113 forms a first on-off signal through the second delay circuit 115 and is transmitted to the first switch element Mux1.

[0050] In the embodiment of the present application, by providing a logic gate circuit including a NAND gate and a NOR gate and a delay circuit in the control module 110, the control module 110 can convert the received control signal into a first on-off signal and a second on-off signal, and transmit them to the first switch element Mux1 and the second switch element Mux2 respectively, thereby controlling the on-off state of the first switch element Mux1 and the second switch element Mux2 respectively, and can avoid the first switch element Mux1 and the second switch element Mux2 being turned on at the same time, thereby further improving the display driving effect of the display driving device 100 on the display module.

[0051] In some embodiments of the present application, the driving capability of the second amplifier AMP2 is greater than the driving capability of the first amplifier AMP1 , and the driving capability of the second amplifier AMP2 is greater than the driving capability of the third amplifier AMP3 .

[0052] In an embodiment of the present application, in the initial stage of transmitting the data signal to the display module, the second amplifier AMP2 is required to assist the first amplifier AMP1 or the third amplifier AMP3 in driving. Therefore, the driving capability of the second amplifier AMP2 is set to be greater than the driving capability of the first amplifier AMP1 and greater than the driving capability of the third amplifier AMP3. This can ensure a larger driving capability in the initial stage of transmitting the data signal to the display module, and in the maintenance stage of data transmission, the data signal can be maintained only by the first amplifier AMP1 with smaller driving capability or the third amplifier AMP3 with smaller driving capability, thereby further reducing the power consumption of the display driving device 100.

[0053] For example, the driving capability of the first amplifier AMP1 is equal to the driving capability of the third amplifier AMP3. By setting the driving capability of the first amplifier AMP1 and the driving capability of the third amplifier AMP3 to be the same, the driving capability corresponding to the process of maintaining the data signal through the first amplifier AMP1 and the process of maintaining the data signal through the third amplifier AMP3 is the same, which can further ensure the stability of the data signal transmitted to the display driver device 100.

[0054] In some embodiments of the present application, the driving capability of the second amplifier AMP2 ranges from 40% to 80%.

[0055] Exemplarily, if the driving capability of the second amplifier AMP2 is 50%, the driving capabilities of the first amplifier AMP1 and the third amplifier AMP3 are both 25%, or the driving capability of the first amplifier AMP1 is 20% and the driving capability of the third amplifier AMP3 is 30%.

[0056] Exemplarily, the driving capability of the second amplifier AMP2 is 60%, and the driving capabilities of the first amplifier AMP1 and the third amplifier AMP3 are both 20%.

[0057] It should be noted that the sum of the driving capability of the second amplifier AMP2 , the driving capability of the first amplifier AMP1 , and the driving capability of the third amplifier AMP3 is 100%.

[0058] In an embodiment of the present application, by setting the value range of the driving capability of the second amplifier AMP2 to be greater than or equal to 50% and less than or equal to 80%, the auxiliary driving effect of the second amplifier AMP2 on the first amplifier AMP1 or the third amplifier AMP3 in the initial stage of transmitting the data signal can be further improved, and the power consumption in the maintenance stage of transmitting the data signal can be further reduced.

[0059] In some embodiments of the present application, the second end of the first amplifier AMP1 is connected to the third end of the first amplifier AMP1, the second end of the second amplifier AMP2 is connected to the third end of the second amplifier AMP2, and the second end of the third amplifier AMP3 is connected to the third end of the third amplifier AMP3.

[0060] In the embodiment of the present application, the first end and the third end of the first amplifier AMP1 are both input ends, and the second end of the first amplifier AMP1 is the output end. By connecting the second end of the first amplifier AMP1 with the third end of the first amplifier AMP1, that is, the third end of the first amplifier AMP1 is a negative feedback input end, the output signal of the first amplifier AMP1 is negatively fed back to the third end of the first amplifier AMP1.

[0061] The first end and the third end of the second amplifier AMP2 are both input ends, and the second end of the second amplifier AMP2 is an output end. By connecting the second end of the second amplifier AMP2 with the third end of the second amplifier AMP2, that is, the third end of the second amplifier AMP2 is a negative feedback input end, the output signal of the second amplifier AMP2 is negatively fed back to the third end of the second amplifier AMP2.

[0062] The first end and the third end of the third amplifier AMP3 are both input ends, and the second end of the third amplifier AMP3 is an output end. By connecting the second end of the third amplifier AMP3 with the third end of the third amplifier AMP3, that is, the third end of the third amplifier AMP3 is a negative feedback input end, the output signal of the third amplifier AMP3 is negatively fed back to the third end of the third amplifier AMP3.

[0063] It should be noted that the negative feedback connection relationship of the first amplifier AMP1, the second amplifier AMP2 and the third amplifier AMP3 is the same.

[0064] In the embodiment of the present application, by setting a negative feedback path for the first amplifier AMP1, the second amplifier AMP2 and the third amplifier AMP3, the stability of the output signals of the first amplifier AMP1, the second amplifier AMP2 and the third amplifier AMP3 is further improved.

[0065] In some embodiments of the present application, the display module includes a first pixel row and a second pixel row; wherein the first end of the first switch element Mux1 is connected to the first pixel row, and the first end of the second switch element Mux2 is connected to the second pixel row.

[0066] In an embodiment of the present application, the display driving device 100 is capable of driving a first pixel row and a second pixel row in a display module, wherein a first end of the first switch element Mux1 transmits a data signal to the first pixel row to drive the first pixel row, and a first end of the second switch element Mux2 transmits a data signal to the second pixel row to drive the second pixel row, thereby reducing the hardware cost of the display driving device 100.

[0067] Figure 6 Schematic diagram of signal timing provided in some embodiments of the present application is shown. Figure 6 As shown, the on / off signals include the mux1 signal, which controls the on / off state of the first switch element Mux1, and the mux2 signal, which controls the on / off state of the second switch element Mux2. Within a 1H time, the mux1 and mux2 signals need to be output alternately. During this 1H time, the CTS signal (control signal) is reversed, and the control module 110 outputs the mux1 and mux2 signals with opposite phases. When the first switch element Mux1 is off, the first amplifier AMP1, with a 20% drive capability, outputs the data signal stored in the first sample-and-hold circuit S / H1. When the second switch element Mux2 is off, the third amplifier AMP3, with a 20% drive capability, outputs the data signal stored in the second sample-and-hold circuit S / H2. When the first switch element Mux1 needs to be turned on, the display driver 100 needs to output the data signal to be displayed to the display module. This process requires a large driving force to charge the display module. At this time, the first amplifier AMP1 with a 20% driving capacity and the second amplifier AMP2 with a 60% driving capacity are in operation. When the display module is fully charged, only the first amplifier AMP1 with a 20% driving capacity needs to continue to operate and output, and the second amplifier AMP2 with a 60% driving capacity can be turned off, that is, the first switch element Mux1 is controlled to be disconnected. When the second switch element Mux2 is turned on, the above operation output is repeated. When the first switch element Mux1 or the second switch element Mux2 is turned on, the data signal is updated through the first sample and hold circuit S / H1 or the second sample and hold circuit S / H2. The second amplifier AMP2 with a 60% driving capacity is connected to the corresponding output of the first switch element Mux1 or the second switch element Mux2 to adjust the driving capacity.

[0068] Figure 7 FIG3 shows a third circuit diagram of a display driving device provided in some embodiments of the present application. Figure 7As shown, in some embodiments of the present application, the display driving device 100 further includes: a third sampling and holding circuit S / H3, wherein a first end of the third sampling and holding circuit S / H3 is used to receive a data signal; a fourth amplifier AMP4, wherein a first end of the fourth amplifier AMP4 is connected to the third sampling and holding circuit S / H3; and a fifth switch element Mux3, wherein a first end of the fifth switch element Mux3 is connected to a second end of the second amplifier AMP2, and a second end of the fifth switch element Mux3 is connected to a second end of the fourth amplifier AMP4; wherein the number of the third sampling and holding circuits S / H3, the number of the fourth amplifiers AMP4, and the number of the fifth switch elements Mux3 are all at least one.

[0069] In the embodiment of the present application, the display driver device 100 can also be expanded to drive multiple pixel rows in the display device. A third sampling and holding circuit S / H3 and a fourth amplifier AMP4 are provided in the display driver device 100. The third sampling and holding circuit S / H3 and the fourth amplifier AMP4, the first end of the third sampling and holding circuit S / H3 is a signal input end, the second end of the third sampling and holding circuit S / H3 is a signal output end, the second end of the third sampling and holding circuit S / H3 is connected to the first end of the fourth amplifier AMP4, and the fifth switch element Mux3 is connected between the fourth amplifier AMP4 and the second amplifier AMP2.

[0070] Specifically, by controlling the on-off states of the first switch element Mux1, the second switch element Mux2 and the fifth switch element Mux3, it is possible to select to transmit data signals to the display module through the first amplifier AMP1, the third amplifier AMP3 or the fourth amplifier AMP4, and it is possible to select to assist in driving the first amplifier AMP1, the third amplifier AMP3 or the fourth amplifier AMP4 through the second amplifier AMP2.

[0071] It should be noted that a plurality of the third sample-and-hold circuit S / H3, the fourth amplifier AMP4, and the fifth switch element Mux3 can be provided, thereby further reducing the hardware cost of the display driver device 100. The driving capability of the fourth amplifier AMP4 is the same as that of the first amplifier AMP1 and the third amplifier AMP3, and the driving capability of the fourth amplifier AMP4 is less than that of the second amplifier AMP2.

[0072] In the embodiment of the present application, the first and third terminals of the fourth amplifier AMP4 are both input terminals, and the second terminal of the fourth amplifier AMP4 is an output terminal. By connecting the second terminal of the fourth amplifier AMP4 to the third terminal of the fourth amplifier AMP4, that is, the third terminal of the fourth amplifier AMP4 serves as a negative feedback input terminal, the output signal of the fourth amplifier AMP4 is negatively fed back to the third terminal of the fourth amplifier AMP4. By providing the fourth amplifier AMP4 with a negative feedback path, the stability of the output signal of the fourth amplifier AMP4 is further improved.

[0073] Exemplarily, the number of the fourth amplifier AMP4 is one, the driving capability of the second amplifier AMP2 is 70%, and the driving capabilities of the first amplifier AMP1, the third amplifier AMP3, and the fourth amplifier AMP4 are all 10%.

[0074] Exemplarily, the number of the fourth amplifiers AMP4 is 2, the driving capability of the second amplifier AMP2 is 40%, and the driving capabilities of the first amplifier AMP1, the third amplifier AMP3, and the fourth amplifier AMP4 are all 15%.

[0075] In the embodiment of the present application, by providing a third sampling and holding circuit S / H3, a fourth amplifier AMP4 and a fifth switch element Mux3 in the display driver device 100, the number of pixel rows driven by the driver device in the display module is expanded, thereby further reducing the hardware cost of the display driver device 100.

[0076] In some embodiments of the present application, an electronic device is provided. Figure 8 1 shows a circuit diagram of an electronic device provided in some embodiments of the present application, such as Figure 8 As shown, the electronic device 200 includes a display driver and a display module 210. The display module 210 is connected to the display driver. The display driver is the display driver in any of the above embodiments, and thus has all the beneficial technical effects of the display driver in any of the above embodiments, which will not be elaborated here.

[0077] The display module 210 includes a first pixel row 211 and a second pixel row 212 . The first end of the first switch element is connected to the first pixel row 211 , and the first end of the second switch element is connected to the second pixel row 212 .

[0078] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A display driving device, characterized in that: The display driving device is connected to the display module and is used to transmit a data signal to the display module. The display driving device includes: a first sampling and holding circuit, wherein a first end of the first sampling and holding circuit is used to receive the data signal; a first amplifier, wherein a first terminal of the first amplifier is connected to the first sample-and-hold circuit; a first switch element, wherein a first end of the first switch element is connected to the first amplifier; a second amplifier, wherein a first end of the second amplifier is used to receive the data signal, and a second end of the second amplifier is connected to the second end of the first switch; a second sampling and holding circuit, wherein a first end of the second sampling and holding circuit is used for receiving a data signal; a third amplifier, wherein a first terminal of the third amplifier is connected to the second sample-and-hold circuit; a second switch element, wherein a first end of the second switch element is connected to a second end of the second amplifier, and a second end of the second switch element is connected to a second end of the third amplifier; Wherein, the first end of the first switch element and the first end of the second switch element are used to transmit the data signal to the display module.

2. The display driving device according to claim 1, wherein: The first sample-and-hold circuit comprises: a third switch element, wherein a first end of the third switch element is used to receive the data signal, and a second end of the third switch element is used to output the data signal; a first capacitor, wherein a first end of the first capacitor is connected to the second end of the third switch element and the first end of the first switch element, and a second end of the first capacitor is grounded; The second sample-and-hold circuit comprises: a fourth switch element, wherein a first end of the fourth switch element is used to receive the data signal, and a second end of the fourth switch element is used to output the data signal; A second capacitor, wherein a first end of the second capacitor is connected to the second end of the fourth switch element and the first end of the second switch element, and a second end of the second capacitor is grounded.

3. The display driving device according to claim 2, wherein: The control end of the first switch element is connected to the control end of the third switch element, wherein the on-off state of the first switch element matches the on-off state of the third switch element; The control end of the second switch element is connected to the control end of the fourth switch element, wherein the on-off state of the second switch element matches the on-off state of the fourth switch element.

4. The display driving device according to any one of claims 1 to 3, characterized in that: Also includes: a control module, wherein an input end of the control module is used to receive a control signal, a first output end of the control module is connected to the control end of the first switch element, and a second output end of the control module is connected to the control end of the second switch element; The control module is configured to output on / off signals with opposite phases through the first output terminal and the second output terminal to control the on / off states of the first switch element and the second switch element.

5. The display driving device according to claim 4, wherein: The on-off signal includes a first on-off signal and a second on-off signal, and the control module includes: A NAND gate circuit, wherein the input end of the NAND gate circuit is used to receive the control signal; a first NOR gate circuit, wherein a first input terminal of the first NOR gate circuit is connected to an input terminal of the NAND gate circuit; a second NOR gate circuit, wherein a first input terminal of the second NOR gate circuit is connected to an output terminal of the NAND gate circuit; a first delay circuit, wherein an input end of the first delay circuit is connected to an output end of the first NOR gate circuit, an output end of the first delay circuit is connected to a second input end of the second NOR gate circuit, and the first delay circuit is configured to output the second on-off signal; A second delay circuit, wherein the input end of the second delay circuit is connected to the output end of the second NOR gate circuit, the output end of the second delay circuit is connected to the second input end of the first NOR gate circuit, and the second delay circuit is used to output the first on-off signal.

6. The display driving device according to any one of claims 1 to 3, characterized in that: The driving capability of the second amplifier is greater than that of the first amplifier, and the driving capability of the second amplifier is greater than that of the third amplifier.

7. The display driving device according to any one of claims 1 to 3, characterized in that: The second end of the first amplifier is connected to the third end of the first amplifier, the second end of the second amplifier is connected to the third end of the second amplifier, and the second end of the third amplifier is connected to the third end of the third amplifier.

8. The display driving device according to any one of claims 1 to 3, characterized in that: The display module includes a first pixel row and a second pixel row; Wherein, the first end of the first switch element is connected to the first pixel row, and the first end of the second switch element is connected to the second pixel row.

9. The display driving device according to any one of claims 1 to 3, characterized in that: Also includes: a third sampling and holding circuit, wherein a first end of the third sampling and holding circuit is used to receive the data signal; a fourth amplifier, wherein a first terminal of the fourth amplifier is connected to the third sample-and-hold circuit, and a second terminal of the fourth amplifier is connected to a third terminal of the fourth amplifier; a fifth switch element, wherein a first end of the fifth switch element is connected to the second end of the second amplifier, and a second end of the fifth switch element is connected to the second end of the fourth amplifier; The number of the third sampling and holding circuits, the number of the fourth amplifiers, and the number of the fifth switch elements are all at least one.

10. An electronic device, characterized in that: include: The display driving device according to any one of claims 1 to 9; The display module is connected to the display driving device.

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