Viewing angle switching control circuit of display device and display device

Abstract

The application discloses a viewing angle switching control circuit of a display device, comprising: a power voltage generation module, which is used for providing a corresponding amplitude power voltage according to a received wide / narrow viewing angle signal; a viewing angle switching signal generation module, which is connected with the power voltage generation module to receive a first power voltage, and is used for providing a corresponding viewing angle switching signal according to the wide / narrow viewing angle signal and the received first power voltage and second power voltage, wherein the power voltage generation module comprises a switchable resistance network and a voltage source, the switchable resistance network provides a feedback voltage of the first power voltage according to the resistance value selected by the wide / narrow viewing angle signal, and the voltage source adjusts the amplitude of the first power voltage according to the feedback voltage, so that the voltage amplitude of the first power voltage when the wide / narrow viewing angle signal indicates a wide viewing angle state is smaller than the voltage amplitude when the wide / narrow viewing angle signal indicates a narrow viewing angle state. Without the participation of a microcontroller, power consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a viewing angle switching control circuit for a display device and a display device thereof. Background Technology

[0002] LCD (Liquid Crystal Display) devices have many advantages such as low power consumption, thinness, and low radiation, and have therefore largely replaced traditional cathode ray tube (CRT) displays. Currently, LCD devices are widely used in electronic devices such as high-definition digital televisions, desktop computers, laptops, tablets, mobile phones, and digital cameras.

[0003] Among them, the hybrid viewing angle LCD display device can switch between wide viewing angle display mode and narrow viewing angle display mode to meet users' different needs for privacy and viewing angle in different application scenarios.

[0004] like Figure 1 As shown, the waveform required by the existing viewpoint switching signal EQ is based on the following... Figure 1 The scheme shown generates a square wave signal by having the microcontroller (MCU) debug the code via the I2C protocol, control the viewpoint switching control circuit to generate a square wave signal, and then use an operational amplifier to bias the waveform to obtain the viewpoint control signal with the final level range.

[0005] However, the above solution uses three components: a microcontroller (MCU), a viewpoint switching control circuit, and an operational amplifier, resulting in higher costs. Furthermore, the MCU also handles other functions of the HVA model, and the IC communication between the MCU and the viewpoint switching control circuit consumes valuable MCU resources, increasing the instability of MCU code debugging. Moreover, the new solution requires the viewpoint control signal amplitude to reach + / -10V or higher, while the existing power supply voltage is also greater than 10V, leading to excessive power consumption. Summary of the Invention

[0006] In view of the above problems, the purpose of the present invention is to provide a viewing angle switching control circuit for a display device and a display device, thereby solving the above technical problems.

[0007] According to one aspect of the present invention, a viewing angle switching control circuit for a display device is provided, comprising: a power supply voltage generation module for providing a power supply voltage of corresponding amplitude according to a received wide and narrow viewing angle signal, the power supply voltage including a first power supply voltage having a positive voltage amplitude; and a viewing angle switching signal generation module connected to the power supply voltage generation module to receive the first power supply voltage, the viewing angle switching signal generation module being configured to provide a corresponding viewing angle switching signal according to the wide and narrow viewing angle signal and the received first and second power supply voltages, the viewing angle switching signal being configured to drive the display device to operate in a wide viewing angle display mode or a narrow viewing angle display mode, wherein the power supply voltage generation module includes a switchable resistor network and a voltage source, the switchable resistor network providing a feedback voltage of the first power supply voltage according to a resistance value selected according to the wide and narrow viewing angle signal, and the voltage source adjusting the amplitude of the first power supply voltage according to the feedback voltage, such that the voltage amplitude of the first power supply voltage when the wide and narrow viewing angle signal indicates a wide viewing angle state is less than the voltage amplitude when the wide and narrow viewing angle signal indicates a narrow viewing angle state.

[0008] Preferably, the power supply voltage generation module further includes an inverter, the switchable resistor network includes multiple first resistor branches, the voltage source includes an input terminal, a feedback terminal, and an output terminal, the input terminal receives the power supply voltage, the output terminal outputs the first power supply voltage, and a first resistor is connected between the feedback terminal and the output terminal; the inverter includes an input terminal and an output terminal, the input terminal receives the first power supply voltage, and the output terminal outputs a second power supply voltage; the multiple first resistor branches are connected between the feedback terminal of the voltage source and ground, and at least one of the multiple first resistor branches is connected to the feedback terminal of the voltage source according to the wide and narrow viewing angle signal.

[0009] Preferably, the plurality of first resistor branches include the branches containing the second resistor and the third resistor. The viewing angle switching control circuit further includes: a first switch transistor connected between the second resistor and ground, the control terminal of which receives the wide and narrow viewing angle signal to control the first resistor branch containing the second resistor to connect to the feedback terminal of the voltage source; a second switch transistor connected between the third resistor and ground, the control terminal of which is connected to the first path terminal of the third switch transistor to control the first resistor branch containing the third resistor to connect to the feedback terminal of the voltage source; the third switch transistor has a control terminal that receives the wide and narrow viewing angle signal and a second path terminal that receives a first input voltage.

[0010] Preferably, the voltage source adjusts the first power supply voltage according to the reference voltage at the feedback terminal and the feedback voltage, and the reference voltage at the feedback terminal is set according to the preset parameters of the voltage source.

[0011] Preferably, the viewing angle switching signal generation module includes: a first operational amplifier, whose positive power supply terminal receives the first power supply voltage, whose negative power supply terminal receives the second power supply voltage, whose non-inverting input terminal receives a first square wave signal provided by a timing controller, whose inverting input terminal receives the first input voltage, and whose output terminal outputs a second square wave signal; a multiplexer, whose input terminal is connected to the output terminal of the first operational amplifier to receive the second square wave signal, whose control terminal receives the wide and narrow viewing angle signals, and whose multiple output terminals are respectively connected to multiple second resistor branches, the multiplexer being used to conduct the input terminal and the corresponding output terminal according to the wide and narrow viewing angle signals; and a second operational amplifier, whose negative input terminal is respectively connected to the multiple second resistor branches, and whose corresponding resistor is connected according to the conduction status of the multiplexer.

[0012] Preferably, a fourth resistor is connected to the inverting input terminal of the first operational amplifier, and a fifth resistor is connected between the inverting input terminal and the output terminal of the first operational amplifier; the multiple second resistor branches respectively include the branches containing the sixth and seventh resistors; an eighth resistor is connected between the inverting input terminal and the output terminal of the second operational amplifier, and the second operational amplifier amplifies the first square wave signal to obtain the viewing angle switching signal according to the multiple relationship between the eighth resistor and the corresponding resistor connected to the negative input terminal.

[0013] Preferably, the positive input terminal of the second operational amplifier is connected to a plurality of third resistor branches, including the branches containing the ninth resistor and the tenth resistor.

[0014] Preferably, the viewing angle switching signal generation module further includes: a fourth switch transistor connected between the ninth resistor and ground, the control terminal receiving the wide and narrow viewing angle signal to control the third resistor branch containing the ninth resistor to connect to the non-inverting input terminal of the second operational amplifier; a fifth switch transistor connected between the tenth resistor and ground, the control terminal connected to the first path terminal of the sixth switch transistor to control the third resistor branch containing the tenth resistor to connect to the non-inverting input terminal of the second operational amplifier; the control terminal receiving the wide and narrow viewing angle signal, and the second path terminal receiving the first input voltage.

[0015] Preferably, the first, second, fourth, and fifth switching transistors are N-type switching transistors, and the third and sixth switching transistors are P-type switching transistors.

[0016] According to another aspect of the present invention, a display device is also provided, characterized in that it includes: a viewing angle switching control circuit as described in any of the preceding claims, which generates a corresponding viewing angle switching signal based on the received wide and narrow viewing angle signals; and a viewing angle switching module, coupled to the viewing angle switching control circuit, which receives the viewing angle switching signal and operates in the corresponding mode.

[0017] The viewing angle switching control circuit of the display device provided by this invention avoids the workflow of communicating with a microcontroller. It can provide different viewing angle switching signals under the control of the wide and narrow viewing angle signals (HVA). This effectively reduces the use of a microcontroller in the display device. Furthermore, the viewing angle switching control circuit of this application has a simple structure and occupies less space, effectively reducing production costs while also reducing the use of communication ports, which is beneficial for the development and adaptation of new functions in the future.

[0018] Furthermore, the viewing angle switching control circuit of this application includes a power supply voltage generation module, which provides a first power supply voltage and a second power supply voltage with corresponding amplitudes according to the received wide and narrow viewing angle signals, so that power supply voltages with different amplitudes can be provided according to the changes in viewing angle, thereby reducing power consumption.

[0019] In a preferred embodiment, the high and low levels of the viewpoint switching signal can be changed by adjusting the connection of the multiplexer and multiple third resistor branches in the viewpoint switching signal generation module. Therefore, the viewpoint switching circuit provided in this application can flexibly adjust its parameters according to the requirements of actual application scenarios, exhibiting good applicability. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0021] Figure 1 A schematic block diagram showing perspective switching according to existing technology is shown;

[0022] Figure 2 This diagram shows a structural block diagram of a display device according to an embodiment of the present application;

[0023] Figure 3 A circuit diagram of a perspective switching control circuit according to an embodiment of this application is shown;

[0024] Figure 4a This illustrates the signal correspondences according to embodiments of this application;

[0025] Figure 4b The output signal waveform of the perspective switching control circuit is shown. Detailed Implementation

[0026] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements or modules are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0027] It should be understood that, in the following description, "circuit" may include single or combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by the programmable circuit. When an element or circuit is said to be "connected" to another element or "connected" between two nodes, it may be directly coupled or connected to the other element, or there may be intermediate elements; the connection between elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected" to another element, it means that there are no intermediate elements between them.

[0028] Furthermore, certain terms are used in this patent specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This patent specification and claims do not distinguish components based on differences in name, but rather on differences in function.

[0029] In this application, the term "semiconductor structure" refers to the collective term for the entire semiconductor structure formed in the various steps of manufacturing a memory device, including all layers or regions that have been formed. Many specific details of the invention, such as the structure, materials, dimensions, processing techniques, and methods of the device, are described below to provide a clearer understanding of the invention. However, as those skilled in the art will understand, the invention may be implemented without adhering to these specific details.

[0030] Furthermore, it should be noted that in this document, relational terms such as "first" and "second" are used only 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. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, 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 process, method, article, or apparatus that includes said element.

[0031] Figure 2 A structural block diagram of a display device according to an embodiment of this application is shown.

[0032] The display device 200 includes a display array 210, a viewing angle switching control circuit 220, a viewing angle switching module 230, and a timing control circuit, a gate driving circuit, a source driving circuit, and a backlight board (not shown in the figure).

[0033] The display array 210 includes multiple pixel units arranged in an array. Each pixel unit mainly includes a thin-film transistor (TFT), a storage capacitor, and a liquid crystal capacitor. Each pixel unit is connected to a gate driving circuit via a gate line and to a source driving circuit via a source line. In response to a gate driving signal provided through the gate line, the pixel unit can receive a data signal through a data line, store the data signal in the storage capacitor, and thus display a brightness corresponding to the data signal.

[0034] The viewing angle switching control circuit 220 provides a corresponding viewing angle switching signal VEQ to the viewing angle switching module 230 based on the received wide and narrow viewing angle signals HVA, thereby controlling the display device 200 to operate in either the wide viewing angle display mode or the narrow viewing angle display mode.

[0035] In addition, the display device also includes a timing control circuit for controlling the gate drive circuit and the source drive circuit. The timing control circuit can receive externally provided control signals (e.g., control signals including clock signals) and generate gate control signals and data control signals based on the control signals.

[0036] The gate drive circuit can receive a gate control signal from the timing control circuit, generate a gate drive signal based on the gate control signal, and provide the gate drive signal to the corresponding gate line.

[0037] The source drive circuit can receive source control signals and frame data from the timing control circuit, generate a data signal corresponding to the frame data, and provide the data signal to the corresponding data line.

[0038] The backlight panel is used to provide backlight to the display array 210.

[0039] Figure 3 A circuit diagram of a perspective switching control circuit according to an embodiment of this application is shown.

[0040] Figure 3 Show Figure 2 Circuit schematic of the medium-view switching control circuit 220. Figure 4a This illustrates the signal correspondences according to embodiments of this application; Figure 4b The output signal waveform of the perspective switching control circuit is shown. Please refer to the diagram for a comprehensive view.

[0041] The viewpoint switching control circuit 220 includes a power supply voltage generation module 221 and a viewpoint switching signal generation module 222.

[0042] The power supply voltage generation module 221 is used to provide a first power supply voltage VS+ and a second power supply voltage VS- with corresponding amplitudes according to the received wide and narrow viewing angle signal HVA; the viewing angle switching signal generation module 222 is connected to the power supply voltage generation module 221, and is used to receive the first power supply voltage VS+, the second power supply voltage VS- and the wide and narrow viewing angle signal HVA, and output a corresponding viewing angle switching signal VEQ to the viewing angle switching module 230 according to the received first power supply voltage VS+, the second power supply voltage VS- and the wide and narrow viewing angle signal HVA, thereby controlling the display device 200 to work in either the wide viewing angle display mode or the narrow viewing angle display mode.

[0043] The power supply voltage generation module 221 includes a switchable resistor network and a voltage source. The switchable resistor network provides a feedback voltage for the first power supply voltage based on the resistance value selected by the wide and narrow viewing angle signal HVA. The voltage source adjusts the amplitude of the first power supply voltage based on the feedback voltage, so that the voltage amplitude of the first power supply voltage when the wide and narrow viewing angle signal HVA indicates a wide viewing angle state is less than the voltage amplitude when the wide and narrow viewing angle signal HVA indicates a narrow viewing angle state, thereby reducing power consumption.

[0044] Specifically, the power supply voltage generation module 221 also includes an inverter U2, a first switch Q1, a second switch Q2, a third switch Q3, and a resistor network including multiple first resistor branches.

[0045] Voltage source U1 includes, for example, an input terminal VIN, a feedback terminal FB, and an output terminal LX. The input terminal VIN of voltage source U1 receives the supply voltage, and the output terminal LX outputs a first power supply voltage VS+. A first resistor R1 is connected between the feedback terminal FB and the output terminal LX. The feedback terminal FB and ground include multiple first resistor branches. The first power supply voltage VS+ output by the output terminal LX is related to the voltage of the feedback terminal FB and the voltage division of the first resistor R1.

[0046] Inverter U2 includes an input terminal and an output terminal. The input terminal of inverter U2 receives a first power supply voltage VS+, and the output terminal outputs a second power supply voltage VS-.

[0047] The multiple first resistor branches include the first resistor branch containing the second resistor R2 and the first resistor branch containing the third resistor R3.

[0048] The first switch Q1 is connected between the second resistor R2 and ground. The control terminal receives the wide and narrow viewing angle signal HVA to control the first resistor branch containing the second resistor R2 to be connected to the feedback terminal FB.

[0049] The second switch Q2 is connected between the third resistor R3 and ground. The control terminal of the second switch Q2 is connected to the first path terminal of the third switch Q3 to control the first resistor branch containing the third resistor R3 to connect to the feedback terminal FB. The control terminal of the third switch Q3 receives the wide and narrow viewing angle signal HVA, and the second path terminal receives the first input voltage VS1. In one embodiment, the first switch Q1 and the second switch Q2 are N-type switches, and the third switch Q3 is a P-type switch. The first input voltage VS1 is a high level, for example, 2.6V.

[0050] In a more specific embodiment, the feedback terminal FB voltage of the voltage source U1 is set according to the internal parameters of the power supply chip.

[0051] When the wide and narrow viewing angle signal HVA is low, the first switch Q1 is off and the third switch Q3 is on. The first input voltage VS1 is connected to the control terminal of the second switch Q2, and the second switch Q2 is on. The first resistor branch containing the third resistor R3 is connected to the feedback terminal FB. The resistance value of the second resistor R2 is greater than the resistance value of the third resistor R3. When the first resistor branch containing the third resistor R3 is connected to the feedback terminal FB, the output terminal LX outputs the first power supply voltage VS+ = VFB*(1+R1 / R3), where VFB is the feedback voltage, which meets the operating voltage requirements of the operational amplifier under wide viewing angle. In one embodiment, the first power supply voltage VS+ under wide viewing angle is controlled to be 10V for example.

[0052] When the wide and narrow viewing angle signal HVA is high, the first switch Q1 is turned on, the third switch Q3 is turned off, and the second switch Q2 is also turned off. The branch of the first resistor containing the second resistor R2 is connected to the feedback terminal, and the output terminal LX outputs the first power supply voltage VS+ = VFB*(1+R1 / R2). Since the resistance of the second resistor R2 is greater than the resistance of the third resistor R3, the VS+ output voltage is low at this time, which meets the operating voltage requirements of the operational amplifier when the viewing angle is narrow. In one embodiment, the first power supply voltage VS+ under the narrow viewing angle is controlled to be 5V, which can reduce the power consumption of the viewing angle switching module and simultaneously save the power consumption of the viewing angle switching control circuit.

[0053] In both of the above cases, when the voltage source U1 outputs a stable value, the feedback voltage is close to the reference voltage at the feedback terminal, which is set according to the preset parameters of the voltage source.

[0054] The viewpoint switching signal generation module 222 includes a first operational amplifier OP1, a multiplexer MUX1, and a second operational amplifier OP2.

[0055] The positive power supply terminal of the first operational amplifier OP1 receives the first power supply voltage VS+, the negative power supply terminal receives the second power supply voltage VS-, the non-inverting input terminal receives the first square wave signal provided by the timing controller, and the inverting input terminal receives the first input voltage VS1. A fourth resistor R4 is also connected to the inverting input terminal of the first operational amplifier OP1, and a fifth resistor R5 is connected between the inverting input terminal and the output terminal of the first operational amplifier OP1. The output terminal of the first operational amplifier OP1 outputs a second square wave signal FB01_EQ with a preset amplitude.

[0056] The input terminal of the multiplexer MUX1 is connected to the output terminal of the first operational amplifier OP1 to receive the second square wave signal FB01_EQ. The control terminal receives the wide and narrow viewing angle signal HVA (not shown in the figure). Multiple output terminals are connected to multiple second resistor branches respectively. The multiplexer is used to connect the input terminal and the corresponding output terminal according to the wide and narrow viewing angle signal HVA.

[0057] In one embodiment, the aforementioned plurality of second resistor branches respectively include the second resistor branch containing the sixth resistor R6 and the second resistor branch containing the seventh resistor R7, which are connected in parallel between the output terminal of the first operational amplifier and the inverting input terminal of the second operational amplifier OP2. When the wide and narrow viewing angle signal HVA is at a high level, the second square wave signal FB01_EQ is conducted to the inverting input terminal of the second operational amplifier OP2 via resistor R6; when the wide and narrow viewing angle signal HVA is at a low level, the second square wave signal FB01_EQ is conducted to the inverting input terminal of the second operational amplifier OP2 via resistor R7.

[0058] The positive power supply terminal of the second operational amplifier OP2 receives the first power supply voltage VS+, the negative power supply terminal receives the second power supply voltage VS-, the non-inverting input terminal receives the first square wave signal provided by the timing controller, and the inverting input terminal receives the first input voltage VS1. An eighth resistor R8 is connected between the inverting input terminal and the output terminal of the first operational amplifier OP1. By setting the ratio of the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8, a preset amplitude viewing angle switching signal VEQ can be output at the output terminal of the second operational amplifier OP2.

[0059] In one embodiment, the resistance of the eighth resistor R8 is 5 times that of the sixth resistor R6 and 2 times that of the seventh resistor R7.

[0060] In one embodiment, the non-inverting input of operational amplifier OP2 is connected to multiple third resistor branches, including the third resistor branches containing the ninth resistor R9 and the tenth resistor R10.

[0061] The fourth switch Q4 is connected between the ninth resistor R9 and ground. The control terminal receives the wide and narrow viewing angle signal HVA to control the third resistor branch containing the ninth resistor R9 to be connected to the non-inverting input of the second operational amplifier.

[0062] The fifth switch Q5 is connected between the tenth resistor R10 and ground. The control terminal of the fifth switch Q5 is connected to the first path terminal of the sixth switch Q6 to control the third resistor branch containing the tenth resistor R10 to be connected to the non-inverting input terminal of the second operational amplifier. The control terminal of the sixth switch Q6 receives the wide and narrow viewing angle signal HVA, and the second path terminal receives the first input voltage VS1. In one embodiment, the fourth switch Q4 and the fifth switch Q5 are N-type switches, and the sixth switch Q6 is a P-type switch. The first input voltage VS1 is high, for example, 2.6V.

[0063] In one embodiment, when the wide and narrow viewing angle signal HVA is low, the fourth switch Q4 is off, the sixth switch Q6 is on, the first input voltage VS1 is connected to the control terminal of the fifth switch Q5, the fifth switch Q5 is on, and the third resistor branch containing the tenth resistor R10 is connected to the non-inverting input terminal of the second operational amplifier. When the wide and narrow viewing angle signal HVA is high, the fourth switch Q4 is on, the sixth switch Q6 is off, and the fifth switch Q5 is also off. The third resistor branch containing the ninth resistor R9 is connected to the non-inverting input terminal of the second operational amplifier.

[0064] In one embodiment, the resistance value of the ninth resistor R9 is the same as the parallel resistance value of the seventh resistor R7 and the eighth resistor R8, which are controlled by the same wide and narrow viewing angle signal HVA level state and connected to the inverting input of the second operational amplifier; the resistance value of the tenth resistor R10 is the same as the parallel resistance value of the sixth resistor R6 and the eighth resistor R8, which are also controlled by the same wide and narrow viewing angle signal HVA level state and connected to the inverting input of the second operational amplifier. This causes the operational amplifier circuit OP2 to enter a deep negative feedback state, improving amplification accuracy.

[0065] It should be noted that those skilled in the art will understand that the terms “during,” “when,” and “when…” used herein in relation to circuit operation are not strict terms indicating an action that occurs immediately upon the commencement of a startup action, but rather that there may be some small but reasonable delays, such as various propagation delays, between the startup action and the reaction action initiated by it. The terms “approximately” or “substantially” used herein mean that an element value is expected to be close to the declared value or position. However, as is well known in the art, there are always small deviations that make it difficult for the value or position to be strictly the declared value. It has been properly determined in the art that a deviation of at least ten percent (10%) (or at least twenty percent (20%) for semiconductor doping concentration) is a reasonable deviation from the described accurate ideal target. When used in conjunction with signal states, the actual voltage value or logic state of the signal (e.g., “1” or “0”) depends on whether positive or negative logic is used.

[0066] As described above, these embodiments of the present invention do not exhaustively describe all details, nor do they limit the invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The scope of protection of this invention should be determined by the scope defined in the claims and their equivalents.

Claims

1. A viewing angle switching control circuit of a display device, comprising: a power voltage generating module configured to provide a power voltage with a corresponding amplitude according to a received wide-narrow viewing angle signal, the power voltage comprising a first power voltage with a positive voltage amplitude; a viewing angle switching signal generating module connected to the power voltage generating module to receive the first power voltage, the viewing angle switching signal generating module configured to provide a corresponding viewing angle switching signal according to the wide-narrow viewing angle signal and the received first and second power voltages, the viewing angle switching signal configured to drive the display device to operate in a wide viewing angle display mode or a narrow viewing angle display mode, wherein the power voltage generating module comprises: a voltage source comprising an input end, a feedback end and an output end, the input end configured to receive a supply voltage, the output end configured to output the first power voltage, the feedback end and the output end connected with a first resistor therebetween; a switchable resistance network comprising a second resistor and a first switch tube connected in series between the feedback end of the voltage source and a ground, and a third resistor and a second switch tube connected in series between the feedback end of the voltage source and the ground, a control end of the second switch tube configured to receive a first input voltage via a third switch tube, a control end of the first switch tube and a control end of the third switch tube configured to receive the wide-narrow viewing angle signal, the switchable resistance network configured to provide a feedback voltage of the first power voltage according to a resistance value selected by the wide-narrow viewing angle signal, the voltage source configured to adjust the amplitude of the first power voltage according to the feedback voltage, such that the voltage amplitude of the first power voltage when the wide-narrow viewing angle signal indicates a wide viewing angle state is smaller than the voltage amplitude of the first power voltage when the wide-narrow viewing angle signal indicates a narrow viewing angle state; and an inverter configured to receive the first power voltage at an input end and output a second power voltage at an output end, the viewing angle switching signal generating module comprises: a first operational amplifier configured to receive the first power voltage at a positive power supply end, receive the second power voltage at a negative power supply end, receive a first square wave signal provided by a timing controller at a non-inverting input end, receive the first input voltage at an inverting input end, and output a second square wave signal at an output end; a multiplexer configured to receive the second square wave signal at an input end connected to the output end of the first operational amplifier, receive the wide-narrow viewing angle signal at a control end, and turn on a corresponding output end according to the wide-narrow viewing angle signal; a second operational amplifier configured to receive different output ends of the multiplexer at an inverting input end via a sixth resistor or a seventh resistor, and receive a eighth resistor connected between the inverting input end and an output end of the second operational amplifier, the second operational amplifier configured to amplify the first square wave signal according to a multiple relationship between the eighth resistor and the resistance of the inverting input end to provide the viewing angle switching signal.

2. The viewing angle switching control circuit according to claim 1, wherein the voltage source is configured to adjust the first power voltage according to a feedback end reference voltage and the feedback voltage, the feedback end reference voltage configured to be set according to preset parameters of the voltage source.

3. The viewing angle switching control circuit of claim 1, wherein A fourth resistor is further connected to the inverting input terminal of the first operational amplifier, and a fifth resistor is connected between the inverting input terminal and the output terminal of the first operational amplifier.

4. The viewing angle switching control circuit according to claim 3, wherein The non-inverting input terminal of the second operational amplifier is connected to a plurality of third resistor branches, and the plurality of third resistor branches include a branch of the ninth resistor and the tenth resistor.

5. The viewing angle switching control circuit according to claim 4, wherein The view angle switching signal generation module further includes: A fourth switch tube is connected between the ninth resistor and the ground, and the control end receives the wide / narrow view angle signal to control the third resistor branch in which the ninth resistor is located to be connected to the non-inverting input terminal of the second operational amplifier; A fifth switch tube is connected between the tenth resistor and the ground, and the control end is connected to the first path end of the sixth switch tube to control the third resistor branch in which the tenth resistor is located to be connected to the non-inverting input terminal of the second operational amplifier, The sixth switch tube has a control end receiving the wide / narrow view angle signal and a second path end receiving the first input voltage.

6. The viewing angle switching control circuit according to claim 5, wherein The first switch tube, the second switch tube, the fourth switch tube, the fifth switch tube are N-type switch tubes, and the third switch tube and the sixth switch tube are P-type switch tubes.

7. A display device, characterized by comprising: The view angle switching control circuit includes: The view angle switching control circuit according to any one of claims 1-6 generates a corresponding view angle switching signal according to the received wide / narrow view angle signal; and The view angle switching module is coupled to the view angle switching control circuit, receives the view angle switching signal and works in a corresponding mode.

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