CN118016016A - Wide-narrow visual angle switching circuit, switching method and display device - Google Patents

Abstract

The embodiment of the invention provides a wide-narrow visual angle switching circuit, a switching method and a display device; the wide-narrow visual angle switching circuit comprises a time sequence controller, a first drive generation module and a second drive generation module; the time sequence controller comprises a control input end, a first output end, a second output end and a third output end; in a narrow viewing angle mode, the first drive generation module receives a first initial waveform, inverts, biases and amplifies the first initial waveform, and generates a narrow viewing angle drive signal; in the wide viewing angle mode, the second driving generation module receives the second initial waveform and the third initial waveform, and inverts, biases, subtracts and amplifies the second initial waveform and the third initial waveform to generate a wide viewing angle driving signal. According to the embodiment of the invention, through the hardware circuit design of the time sequence controller, elements such as a processor, a digital-to-analog conversion module and the like can be omitted, the power consumption and the cost are reduced, and the requirements of driving the wide and narrow viewing angles of the double dimming boxes are met.

Description

Wide-narrow visual angle switching circuit, switching method and display device

Technical Field

The present invention relates to the field of display driving technologies, and in particular, to a wide-narrow viewing angle switching circuit, a switching method, and a display device.

Background

With the continuous progress of the liquid crystal display technology, the visual angle of the display has been widened from about 112 ° to more than 122 °, so people want to effectively protect business secrets and personal privacy while enjoying the visual experience brought by a large visual angle, so as to avoid the business loss or embarrassment caused by the leakage of screen information, and therefore, besides the requirement of a wide visual angle, the display device is required to have the function of switching between wide and narrow visual angles in many occasions.

Fig. 1 is a waveform diagram of a wide viewing angle driving signal and a narrow viewing angle driving signal required for a conventional wide and narrow viewing angle switching. Referring to fig. 1, the display device includes a display box (not shown in the drawing) for displaying a picture, a dimming box (not shown in the drawing) for switching wide and narrow viewing angles, and a wide and narrow viewing angle switching circuit (not shown in the drawing) for driving the dimming box. The wide-narrow viewing angle switching circuit includes a printed circuit board PCBA (not shown in the figure) and a micro control module MCU (not shown in the figure). The printed circuit board PCBA is respectively and electrically connected with the dimming box and the micro control module MCU, and the processor MCU receives the visual angle switching signal and then sends an SPI signal to be communicated with the analog-digital conversion module DAC, and the wide visual angle driving signal and the narrow visual angle driving signal are respectively output. The dimming box receives the wide-view driving signal and the narrow-view driving signal respectively, and performs switching display between the wide-view and the narrow-view.

In order to further improve the display effect of the wide viewing angle and the narrow viewing angle, the prior art also provides another display device capable of switching the wide viewing angle and the narrow viewing angle, which comprises a first dimming box and a second dimming box which are stacked. In the wide viewing angle mode, the first dimming box and the second dimming box respectively receive a wide viewing angle driving signal and a0 potential waveform. The existing wide-narrow view angle switching circuit for driving the dimming box cannot meet the driving requirement of the display device at the same time, and the existing wide-narrow view angle switching circuit needs to use a processor MCU and a digital-to-analog conversion module DAC, so that more electronic elements are needed, the cost is high, and the debugging is complicated.

Disclosure of Invention

In view of this, the present invention provides a wide-narrow viewing angle switching circuit, a switching method, and a display device, which can omit components such as a processor and a digital-to-analog conversion module, reduce power consumption and cost, and meet the requirements of driving wide and narrow viewing angles of a dual-dimming box.

The embodiment of the invention provides a wide-narrow visual angle switching circuit, which comprises a time sequence controller, a first drive generation module and a second drive generation module; the time sequence controller comprises a control input end, a first output end, a second output end and a third output end; the control input end receives the viewing angle switching signal; the first output end is connected with the first drive generation module, and the second output end and the third output end are both connected with the second drive generation module; in the narrow view angle mode, the time schedule controller controls the first output end to output a first initial waveform according to the view angle switching signal as a first effective signal, and the first drive generation module receives the first initial waveform and inverts, biases and amplifies the first initial waveform to generate a narrow view angle drive signal; in the wide viewing angle mode, the timing controller controls the second output end to output a second initial waveform and controls the third output end to output a third initial waveform according to the viewing angle switching signal as a second effective signal, the second driving generation module receives the second initial waveform and the third initial waveform, and the second initial waveform and the third initial waveform are subjected to inversion, bias, subtraction and amplification to generate a wide viewing angle driving signal.

Specifically, the first drive generation module includes a first inverting component for inverting and biasing, and a first amplifying component for amplifying.

Specifically, the first inverting component receives the first initial waveform and generates a first bias signal; the first amplifying component receives the first bias signal and generates the narrow viewing angle driving signal.

Specifically, the second drive generation module includes a second inverting component for inverting and biasing, a subtracting component for subtracting, and a second amplifying component for amplifying.

Specifically, the second inverting component receives the third initial waveform and generates a second bias signal; the subtracting component receives the second bias signal and the second initial waveform and generates a third bias signal; the second amplifying assembly receives the third bias signal and generates the wide viewing angle driving signal.

Specifically, the first inverting component comprises a first operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor; the non-inverting input end of the first operational amplifier is connected with the first end of the first resistor, the inverting input end of the first operational amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, and the output end of the first operational amplifier is respectively connected with the second end of the third resistor and the first end of the fourth resistor; the second end of the first resistor receives a first reference voltage; a second end of the second resistor receives the first initial waveform; the second end of the fourth resistor outputs the first bias signal; the first amplifying assembly comprises a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the non-inverting input end of the second operational amplifier is connected with the first end of the fifth resistor, the inverting input end of the second operational amplifier is respectively connected with the first end of the sixth resistor and the first end of the seventh resistor, and the output end of the second operational amplifier is respectively connected with the second end of the seventh resistor and the first end of the eighth resistor; a second end of the fifth resistor receives the first bias signal; the second end of the sixth resistor is grounded; the second terminal of the eighth resistor outputs the narrow viewing angle driving signal.

Specifically, the second inverting component includes a third operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; the non-inverting input end of the third operational amplifier is connected with the first end of the ninth resistor, the inverting input end of the third operational amplifier is respectively connected with the first end of the tenth resistor and the first end of the eleventh resistor, and the output end of the third operational amplifier is respectively connected with the second end of the eleventh resistor and the first end of the twelfth resistor; a second end of the ninth resistor receives a second reference voltage; a second end of the tenth resistor receives the third initial waveform; the second end of the twelfth resistor outputs the second bias signal; the subtracting component comprises a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; the non-inverting input end of the fourth operational amplifier is respectively connected with the first end of the thirteenth resistor and the first end of the fourteenth resistor, the inverting input end of the fourth operational amplifier is respectively connected with the first end of the fifteenth resistor and the first end of the sixteenth resistor, and the output end of the fourth operational amplifier is connected with the second end of the sixteenth resistor and outputs the third bias signal; a second terminal of the thirteenth resistor receives the second bias signal; the second end of the fourteenth resistor is grounded; a second end of the fifteenth resistor receives the second initial waveform; the second amplifying assembly comprises a fifth operational amplifier, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor and a twentieth resistor; the non-inverting input end of the fifth operational amplifier is connected with the first end of the seventeenth resistor, the inverting input end of the fifth operational amplifier is respectively connected with the first end of the eighteenth resistor and the first end of the nineteenth resistor, and the output end of the fifth operational amplifier is respectively connected with the second end of the nineteenth resistor and the first end of the twentieth resistor; a second end of the seventeenth resistor receives the third bias signal; the second end of the eighteenth resistor is grounded; the second terminal of the twentieth resistor outputs the wide viewing angle driving signal.

Specifically, the time sequence controller comprises an internal crystal oscillator module and an external frequency setting module; the first GPIO module generates a reference waveform based on the built-in frequency of the built-in crystal oscillator module, the second GPIO module generates an adjusting waveform based on the set frequency of the external frequency setting module, and generates a demand waveform of a demand frequency through a frequency divider so as to be used for generating the first initial waveform, the second initial waveform and the third initial waveform.

Specifically, the external frequency setting module is connected with an external resistor, and the external control signal voltage is changed by adjusting the resistance value of the external resistor, so that the frequency of the adjusting waveform generated by the second GPIO module is correspondingly adjusted.

The embodiment of the invention also provides a switching method of the wide-narrow visual angle switching circuit, which comprises a time sequence controller, a first drive generation module and a second drive generation module; the time sequence controller comprises a control input end, a first output end, a second output end and a third output end; the control input end receives the viewing angle switching signal; the first output end is connected with the first drive generation module, and the second output end and the third output end are both connected with the second drive generation module; the switching method of the wide-narrow visual angle switching circuit comprises the following steps: in the narrow view angle mode, the time schedule controller controls the first output end to output a first initial waveform according to the view angle switching signal as a first effective signal, and the first drive generation module receives the first initial waveform and inverts, biases and amplifies the first initial waveform to generate a narrow view angle drive signal; in the wide viewing angle mode, the timing controller controls the second output end to output a second initial waveform and controls the third output end to output a third initial waveform according to the viewing angle switching signal as a second effective signal, the second driving generation module receives the second initial waveform and the third initial waveform, and the second initial waveform and the third initial waveform are subjected to inversion, bias, subtraction and amplification to generate a wide viewing angle driving signal.

The embodiment of the invention also provides a display device which comprises the wide-narrow visual angle switching circuit.

According to the wide-narrow view angle switching circuit, the switching method and the display device, the view angle switching signal triggers the time sequence controller to output the first initial waveform, the second initial waveform and the third initial waveform at the port, and the first drive generating module and the second drive generating module are used for generating the required wide view angle driving signal and the required narrow view angle driving signal, so that components such as a processor and a digital-to-analog conversion module can be omitted through the hardware circuit design of the time sequence controller, power consumption and cost are reduced, and the wide-narrow view angle driving requirement of the double-dimming box is met.

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

Fig. 1 is a waveform diagram of a wide viewing angle driving signal and a narrow viewing angle driving signal required for a conventional wide and narrow viewing angle switching.

Fig. 2 is a schematic structural view of a display device according to a first embodiment of the present invention.

Fig. 3 is a schematic diagram of a configuration of a wide-narrow view angle switching circuit according to a first embodiment of the present invention.

Fig. 4 is a timing diagram of the first, second and third initial waveforms of fig. 3.

Fig. 5 is a functional block diagram of a wide-narrow view switching circuit according to a second embodiment of the present invention.

Fig. 6 is a circuit connection diagram of a first drive generation module of a wide-narrow view angle switching circuit according to a third embodiment of the present invention.

Fig. 7 is a circuit connection diagram of a second drive generation module of the wide-narrow view angle switching circuit according to the fourth embodiment of the present invention.

Fig. 8 is a partial structural connection diagram of a timing controller of a wide-narrow view angle switching circuit according to a fifth embodiment of the present invention.

Fig. 9 is a flow chart of a switching method of the wide-narrow view angle switching circuit according to the sixth embodiment of the invention.

Detailed Description

In order to further describe the technical means and effects adopted for achieving the intended purpose of the present invention, the following detailed description refers to the specific implementation, method, steps, structure, features and effects of the wide-narrow viewing angle switching circuit, driving method and display device according to the present invention with reference to the accompanying drawings and preferred embodiments.

The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings. While the invention may be susceptible to further details of embodiments and examples of means and effects for achieving the desired purpose, the drawings are provided for the purpose of reference and illustration only and are not intended to be limiting.

First embodiment

Fig. 2 is a schematic structural view of a display device according to a first embodiment of the present invention; fig. 3 is a schematic diagram of a configuration of a wide-narrow view angle switching circuit according to a first embodiment of the present invention. Referring to fig. 2 and 3, the display device includes a first dimming box 10 and a second dimming box 20 stacked, and the first dimming box 10 and the second dimming box 20 are used for switching the viewing angle; and a display box 30 positioned at the light entrance side of the first dimming box 10 and the second dimming box 20. Wherein, in the wide viewing angle mode, the first dimming box 10 and the second dimming box 20 receive a wide viewing angle driving signal and a 0 potential waveform, respectively; in the narrow viewing angle mode, the first and second dimming boxes 10 and 20 simultaneously receive the narrow viewing angle driving signal. That is, the initial state of the second dimming box 20 is the wide viewing angle display mode, and the first dimming box 10 is driven into the wide viewing angle display mode after receiving the wide viewing angle driving signal. The first dimming box 10 and the second dimming box 20 are driven into a narrow viewing angle display mode after receiving the narrow viewing angle driving signal.

In other embodiments, the first dimming box 10 may be set to the initial state, i.e. the wide viewing angle display mode, and the second dimming box 20 may be set to the wide viewing angle display mode after receiving the wide viewing angle driving signal. And are not limited herein.

The wide-narrow viewing angle switching circuit of the present embodiment includes a timing controller 100, a first drive generation module 200, and a second drive generation module 300. The timing controller 100 includes a control input 101, a first output 102, a second output 103, and a third output 104; the control input terminal 101 receives a viewing angle switching signal HVA; the first output 102 is connected to the first drive generation module 200, and the second output 103 and the third output 104 are both connected to the second drive generation module 300.

In the narrow viewing angle mode, the timing controller 100 controls the first output terminal 102 to output a first initial waveform according to the viewing angle switching signal HVA as a first effective signal, and the first driving generation module 200 receives the first initial waveform, inverts, biases and amplifies the first initial waveform, and generates a narrow viewing angle driving signal NVA; in the wide viewing angle mode, the timing controller 100 controls the second output terminal 103 to output a second initial waveform and also controls the third output terminal 104 to output a third initial waveform according to the viewing angle switching signal HVA as a second effective signal, and the second driving generation module 300 receives the second initial waveform and the third initial waveform, inverts, biases, subtracts, and amplifies the second initial waveform and the third initial waveform to generate the wide viewing angle driving signal WVA.

Specifically, referring to fig. 2, 3 and 4 in combination, fig. 4 is a timing chart of the first, second and third initial waveforms in fig. 3, the timing controller 100 may generate the first, second and third initial waveforms based on the clock signal and output the first, second and third initial waveforms through the corresponding GPIO ports, i.e. the first, second and third output terminals 102, 103 and 104, and the first and second driving generating modules 200 and 300 may generate the wide-view driving signal WVA and the narrow-view driving signal NVA meeting the requirements of the dual-dimming box by setting related circuits, such as operational amplifiers.

When the timing controller 100 outputs the 0 potential waveform (GND) according to the viewing angle switching signal HVA as the second effective signal (e.g., low level), i.e., operates in the wide viewing angle mode, the second output terminal 103 and the third output terminal 104 normally output the second initial waveform and the third initial waveform, respectively, the second driving generation module 300 inverts, biases, subtracts and amplifies the second initial waveform and the third initial waveform, generates and outputs the wide viewing angle driving signal WVA, and can output the wide viewing angle driving signal to the first dimming box 10, and the first driving generation module 200 generates and outputs the 0 potential waveform (GND) and can output the 0 potential waveform to the second dimming box 20, which can be used to realize the normal display. Meanwhile, the first drive generation module 200 does not need to work, and power consumption can be effectively reduced.

When the timing controller 100 operates in the narrow viewing angle mode according to the viewing angle switching signal HVA as the first effective signal (e.g. high level), the first output terminal 102 normally outputs the first initial waveform, the second output terminal 103 and the third output terminal 104 respectively output the 0 potential waveform (GND), and the first drive generation module 200 inverts, biases and amplifies the first initial waveform to generate and output the narrow viewing angle driving signal NVA, and can simultaneously output the narrow viewing angle driving signal NVA to the first dimming box 10 and the second dimming box 20, thereby realizing the display effect of peeping prevention, and at this time, the second drive generation module 300 generates and outputs the 0 potential waveform (GND), so that the second drive generation module 300 does not need to operate, and power consumption can be effectively reduced. Therefore, the wide-narrow view angle switching circuit of the embodiment can omit elements such as a processor, a digital-to-analog conversion module and the like through the hardware circuit design of the time sequence controller 100, reduces power consumption and cost, meets the wide-narrow view angle driving requirement of the double dimming box, has a simple and flexible circuit structure, and does not need to write processor codes.

Second embodiment

Referring to fig. 5, fig. 5 is a functional block diagram of a wide-narrow view angle switching circuit according to a second embodiment of the present invention. The present embodiment provides a wide-narrow viewing angle switching circuit, whose basic structure and principle and technical effects are the same as those of the first embodiment, and for brevity, reference is made to the corresponding contents of the first embodiment where the description of the embodiment is not mentioned.

In one embodiment of the present invention, as shown in fig. 5, the first driving generating module 200 includes a first inverting component 210 for inverting and biasing, and a first amplifying component 220 for amplifying.

In one embodiment of the present invention, as shown in fig. 5, the first inverting component 210 receives a first initial waveform and generates a first bias signal; the first amplifying component 220 receives the first bias signal and generates the narrow viewing angle driving signal NVA. It should be understood that the present invention is not limited to the connection of fig. 5, for example, the first amplifying component 220 may receive the first initial waveform to generate the first amplified voltage, and the first inverting component may receive the first amplified voltage to perform inversion and bias to generate the narrow viewing angle driving signal NVA, which is included in the protection scope of the present invention.

In an embodiment of the present invention, as shown in fig. 5, the second driving generating module 300 includes a second inverting component 310 for inverting and biasing, a subtracting component 320 for subtracting, and a second amplifying component 330 for amplifying.

In one embodiment of the present invention, as shown in fig. 5, the second inverting component 310 receives the third initial waveform and generates a second bias signal; subtracting component 320 receives the second bias signal and the second initial waveform, generating a third bias signal; the second amplifying component 330 receives the third bias signal and generates the wide viewing angle driving signal WVA. It will be appreciated that the present invention is not limited to the connection of fig. 5, for example, the second inverting component 310 may receive a third initial waveform, generating a second bias signal; the second amplifying component 330 receives the second bias signal and the second initial waveform, generating two amplified signals; subtracting component 320 receives the two amplified signals, performs subtraction to generate wide viewing angle driving signal WVA, etc., and all equivalent variations made by the present invention and the accompanying drawings are included in the protection scope of the present invention.

The wide-narrow viewing angle switching circuit of the present embodiment realizes that the first drive generation module 200 generates the narrow viewing angle drive signal NVA through the first inversion component 210 for inversion and bias, and the first amplification component 220 for amplification; the second drive generation module 300 may also be implemented to generate the wide viewing angle drive signal WVA by a second inverting component 310 for inverting and biasing, a subtracting component 320 for subtracting, and a second amplifying component 330 for amplifying.

Third embodiment

Referring to fig. 6, fig. 6 is a circuit connection diagram of a first driving generation module 200 of a wide-narrow view angle switching circuit according to a third embodiment of the invention. The present embodiment provides a wide-narrow viewing angle switching circuit, whose basic structure and principle and technical effects are the same as those of the second embodiment, and for brevity, reference is made to the corresponding contents of the second embodiment where the description of the embodiment is not mentioned.

In an embodiment of the present invention, as shown in fig. 6, the first inverting component 210 includes a first operational amplifier OP1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; the non-inverting input end of the first operational amplifier OP1 is connected with the first end of the first resistor R1, the inverting input end of the first operational amplifier OP1 is respectively connected with the first end of the second resistor R2 and the first end of the third resistor R3, and the output end of the first operational amplifier OP1 is respectively connected with the second end of the third resistor R3 and the first end of the fourth resistor R4; the second end of the first resistor R1 receives a first reference voltage V1; the second end of the second resistor R2 receives the first initial waveform; the second end of the fourth resistor R4 outputs a first bias signal; the first amplifying component 220 includes a second operational amplifier OP2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; the non-inverting input end of the second operational amplifier OP2 is connected with the first end of the fifth resistor R5, the inverting input end of the second operational amplifier OP2 is respectively connected with the first end of the sixth resistor R6 and the first end of the seventh resistor R7, and the output end of the second operational amplifier OP2 is respectively connected with the second end of the seventh resistor R7 and the first end of the eighth resistor R8; the second end of the fifth resistor R5 receives the first bias signal; the second end of the sixth resistor R6 is grounded; the second terminal of the eighth resistor R8 outputs the narrow viewing angle driving signal NVA.

In an embodiment of the present invention, as shown in fig. 6, the first inverting component 210 further includes a first capacitor C1, a first end of the first capacitor C1 is connected to a second end of the fourth resistor R4, a second end of the first capacitor C1 is grounded, and the first capacitor C1 plays a role in filtering and voltage stabilization.

In an embodiment of the present invention, as shown in fig. 6, the first amplifying assembly 220 further includes a second capacitor C2, a first end of the second capacitor C2 is connected to a second end of the eighth resistor R8, a second end of the second capacitor C2 is grounded, and the second capacitor C2 plays a role in filtering and stabilizing voltage.

In an embodiment of the present invention, as shown in fig. 6, the first amplifying assembly 220 further includes a third capacitor C3, a first end of the third capacitor C3 is connected to a first end of the fifth resistor R5, a second end of the third capacitor C3 is grounded, and the third capacitor C3 plays a role in filtering and stabilizing voltage.

Specifically, when the timing controller 100 sends the first initial waveform to the first driving generating module 200, the first initial waveform is amplified by the inverting amplifying circuit of the first operational amplifier OP1, for example, by 1.15V forward bias, and the first bias signal waveform is output, and finally, the first initial waveform is amplified by the non-inverting amplifying circuit of the second operational amplifier OP2, and the required narrow viewing angle driving signal NVA is obtained.

Fourth embodiment

Referring to fig. 7, fig. 7 is a circuit connection diagram of a second driving generation module 300 of the wide-narrow view angle switching circuit according to a fourth embodiment of the present invention. The present embodiment provides a wide-narrow viewing angle switching circuit, whose basic structure and principle and technical effects are the same as those of the second embodiment, and for brevity, reference is made to the corresponding contents of the second embodiment where the description of the embodiment is not mentioned.

In an embodiment of the present invention, as shown in fig. 7, the second inverting component 310 includes a third operational amplifier OP3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12; the non-inverting input end of the third operational amplifier OP3 is connected with the first end of the ninth resistor R9, the inverting input end of the third operational amplifier OP3 is respectively connected with the first end of the tenth resistor R10 and the first end of the eleventh resistor R11, and the output end of the third operational amplifier OP3 is respectively connected with the second end of the eleventh resistor R11 and the first end of the twelfth resistor R12; the second end of the ninth resistor R9 receives a second reference voltage V2; the second end of the tenth resistor R10 receives the third initial waveform; the second end of the twelfth resistor R12 outputs a second bias signal;

The subtracting block 320 includes a fourth operational amplifier OP4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16; the non-inverting input terminal of the fourth operational amplifier OP4 is connected to the first terminal of the thirteenth resistor R13 and the first terminal of the fourteenth resistor R14, respectively, the inverting input terminal of the fourth operational amplifier OP4 is connected to the first terminal of the fifteenth resistor R15 and the first terminal of the sixteenth resistor R16, respectively, and the output terminal of the fourth operational amplifier OP4 is connected to the second terminal of the sixteenth resistor R16 and outputs a third bias signal; a second end of the thirteenth resistor R13 receives a second bias signal; the second end of the fourteenth resistor R14 is grounded; a second end of the fifteenth resistor R15 receives a second initial waveform;

The second amplifying assembly 330 includes a fifth operational amplifier OP5, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20; the non-inverting input end of the fifth operational amplifier OP5 is connected with the first end of the seventeenth resistor R17, the inverting input end of the fifth operational amplifier OP5 is respectively connected with the first end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19, and the output end of the fifth operational amplifier OP5 is respectively connected with the second end of the nineteenth resistor R19 and the first end of the twentieth resistor R20; the second end of the seventeenth resistor R17 receives the third bias signal; the second end of the eighteenth resistor R18 is grounded; the second terminal of the twentieth resistor R20 outputs the wide viewing angle driving signal WVA.

In an embodiment of the present invention, as shown in fig. 7, the second inverting component 310 further includes a fourth capacitor C4, a first end of the fourth capacitor C4 is connected to the second end of the twelfth resistor R12, a second end of the fourth capacitor C4 is grounded, and the fourth capacitor C4 plays a role in filtering and stabilizing voltage.

In an embodiment of the present invention, as shown in fig. 7, the second amplifying assembly 330 further includes a fifth capacitor C5, a first end of the fifth capacitor C5 is connected to the second end of the twentieth resistor R20, a second end of the fifth capacitor C5 is grounded, and the fifth capacitor C5 plays a role in filtering and stabilizing voltage.

Specifically, when the timing controller 100 sends the second initial waveform and the third initial waveform to the second driving generation module 300, the third initial waveform is reverse biased by the inverting amplifying circuit of the third operational amplifier OP3, outputs the second bias signal waveform, then is subtracted by the subtracting circuit of the fourth operational amplifier OP4, outputs the third bias signal waveform, and finally is amplified by the non-inverting amplifying circuit of the fifth operational amplifier OP5, so as to obtain the required wide viewing angle driving signal WVA.

Fifth embodiment

Referring to fig. 8, fig. 8 is a partial structure connection diagram of a timing controller 100 of a wide-narrow view angle switching circuit according to a fifth embodiment of the present invention. The present embodiment provides a wide-narrow viewing angle switching circuit, whose basic structure and principle and technical effects are the same as those of the first embodiment, and for brevity, reference is made to the corresponding contents of the first embodiment where the description of the embodiment is not mentioned.

In an embodiment of the present invention, as shown in fig. 8, the timing controller 100 includes a built-in crystal oscillator module 111 and an external frequency setting module 121; the first GPIO module 110 generates a reference waveform based on the built-in frequency of the built-in crystal oscillator module 111, the second GPIO module 120 generates an adjustment waveform based on the set frequency of the external frequency setting module 121, and generates a required waveform of a required frequency via the frequency divider 122 for generating a first initial waveform, a second initial waveform, and a third initial waveform. The built-in crystal oscillator module 111 plays a key role in the timing controller 100, and provides a stable clock source, i.e. the reference waveform can be a clock signal, for driving the operation of the whole system. This clock signal is the basis for the operation of all internal functions of the timing controller 100, including data transfer, generation of control signals, and the like. The second GPIO module 120 may adjust the set frequency of the external frequency setting module 121 to generate an adjustment waveform, and generate a required waveform of the required frequency via the frequency divider 122, so as to generate a first initial waveform, a second initial waveform, and a third initial waveform.

In an embodiment of the present invention, as shown in fig. 8, the external frequency setting module 121 is connected to an external resistor RT, and changes the voltage of the external control signal by adjusting the resistance of the external resistor RT, so as to correspondingly adjust the frequency of the adjusting waveform generated by the second GPIO module 120. That is, the magnitude of the external control signal voltage can be changed by adjusting the magnitude of the resistance of the external resistor RT, the frequency of the adjustment waveform output by the second GPIO module 120 is correspondingly changed, and the required waveform of the required frequency can be generated at the frequency divider 122, which can be used to generate the first initial waveform, the second initial waveform and the third initial waveform.

Sixth embodiment

Based on the same inventive concept, the embodiment of the invention also provides a switching method of the wide-narrow view angle switching circuit. Fig. 9 is a flow chart of a switching method of the wide-narrow view angle switching circuit according to the sixth embodiment of the invention.

The wide-narrow viewing angle switching circuit of the embodiment of the invention comprises a time sequence controller 100, a first drive generation module 200 and a second drive generation module 300; the timing controller 100 includes a control input 101, a first output 102, a second output 103, and a third output 104; the control input terminal 101 receives a viewing angle switching signal HVA; the first output 102 is connected to the first drive generation module 200, and the second output 103 and the third output 104 are both connected to the second drive generation module 300. The switching method of the wide-narrow visual angle switching circuit comprises the following steps:

S100, in the narrow view mode, the timing controller 100 controls the first output end 102 to output a first initial waveform according to the view switching signal HVA as a first effective signal, and the first drive generation module 200 receives the first initial waveform and inverts, biases and amplifies the first initial waveform to generate a narrow view driving signal NVA;

In the wide viewing angle mode, S200, the timing controller 100 controls the second output terminal 103 to output a second initial waveform and controls the third output terminal 104 to output a third initial waveform according to the viewing angle switching signal HVA as a second effective signal, and the second driving generation module 300 receives the second initial waveform and the third initial waveform, inverts, biases, subtracts, and amplifies the second initial waveform and the third initial waveform, and generates the wide viewing angle driving signal WVA.

The implementation of the switching method of the wide-narrow viewing angle switching circuit in this embodiment can be referred to the embodiments of the wide-narrow viewing angle switching circuit, and the repetition is not repeated.

Seventh embodiment

Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the wide-narrow view angle switching circuit provided by the embodiment. The display device further comprises a first dimming box, a second dimming box and a display box which are arranged in a stacked mode. In the wide viewing angle mode, the first dimming box and the second dimming box respectively receive a wide viewing angle driving signal and a 0 potential waveform. The implementation of the display device can be seen in the first embodiment (refer to fig. 2), and the repetition is omitted.

According to the wide-narrow view angle switching circuit, the switching method and the display device, the view angle switching signal HVA triggers the time sequence controller 100 to output the first initial waveform, the second initial waveform and the third initial waveform at the port, and then the first drive generation module 200 and the second drive generation module 300 generate the required wide view angle drive signal WVA and the required narrow view angle drive signal NVA, so that the hardware circuit design of the time sequence controller 100 can omit a processor, a digital-analog conversion module and other elements, reduce the power consumption and the cost, and meet the wide-narrow view angle drive requirement of the double-dimming box.

The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and is intended to cover modifications, equivalents and variations of the above embodiments in accordance with the principles of the present invention, without departing from the scope of the invention.

Claims (10)

1. The wide-narrow visual angle switching circuit is characterized by comprising a time sequence controller (100), a first drive generation module (200) and a second drive generation module (300);

The timing controller (100) comprises a control input end (101), a first output end (102), a second output end (103) and a third output end (104); -said control input (101) receives a viewing angle switching signal (HVA); the first output end (102) is connected with the first drive generation module (200), and the second output end (103) and the third output end (104) are connected with the second drive generation module (300);

In the narrow viewing angle mode, the timing controller (100) controls the first output terminal (102) to output a first initial waveform according to the viewing angle switching signal (HVA) as a first effective signal, the first initial waveform is received by the first drive generation module (200), and the first initial waveform is inverted, biased and amplified to generate a narrow viewing angle driving signal (NVA);

in the wide viewing angle mode, the timing controller (100) controls the second output terminal (103) to output a second initial waveform and controls the third output terminal (104) to output a third initial waveform according to the viewing angle switching signal (HVA) as a second effective signal, the second driving generation module (300) receives the second initial waveform and the third initial waveform, and the second initial waveform and the third initial waveform are subjected to inversion, bias, subtraction and amplification to generate a wide viewing angle driving signal (WVA).

2. The wide-narrow view switching circuit according to claim 1, characterized in that the first drive generation module (200) comprises a first inverting component (210) for inverting and biasing, and a first amplifying component (220) for amplifying.

3. The wide-narrow view switching circuit of claim 2, wherein the first inverting component (210) receives the first initial waveform and generates a first bias signal; the first amplifying component (220) receives the first bias signal and generates the narrow view driving signal (NVA).

4. The wide-narrow view switching circuit according to claim 1, characterized in that the second drive generation module (300) comprises a second inverting component (310) for inverting and biasing, a subtracting component (320) for subtracting, and a second amplifying component (330) for amplifying.

5. The wide-narrow view switching circuit of claim 4, wherein the second inverting component (310) receives the third initial waveform, generating a second bias signal; -the subtracting component (320) receives the second bias signal and the second initial waveform, generating a third bias signal; the second amplifying assembly (330) receives the third bias signal and generates the wide viewing angle driving signal (WVA).

6. A wide-narrow view switching circuit according to claim 3, characterized in that the first inverting component (210) comprises a first operational amplifier (OP 1), a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4); the non-inverting input end of the first operational amplifier (OP 1) is connected with the first end of the first resistor (R1), the inverting input end of the first operational amplifier (OP 1) is respectively connected with the first end of the second resistor (R2) and the first end of the third resistor (R3), and the output end of the first operational amplifier (OP 1) is respectively connected with the second end of the third resistor (R3) and the first end of the fourth resistor (R4); a second end of the first resistor (R1) receives a first reference voltage (V1); -a second end of the second resistor (R2) receives the first initial waveform; a second end of the fourth resistor (R4) outputs the first bias signal;

The first amplifying assembly (220) comprises a second operational amplifier (OP 2), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and an eighth resistor (R8); the non-inverting input end of the second operational amplifier (OP 2) is connected with the first end of the fifth resistor (R5), the inverting input end of the second operational amplifier (OP 2) is respectively connected with the first end of the sixth resistor (R6) and the first end of the seventh resistor (R7), and the output end of the second operational amplifier (OP 2) is respectively connected with the second end of the seventh resistor (R7) and the first end of the eighth resistor (R8); -a second end of the fifth resistor (R5) receives the first bias signal; a second end of the sixth resistor (R6) is grounded; the second terminal of the eighth resistor (R8) outputs the narrow viewing angle driving signal (NVA).

7. The wide-narrow view switching circuit according to claim 5, wherein the second inverting component (310) includes a third operational amplifier (OP 3), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), and a twelfth resistor (R12); the non-inverting input end of the third operational amplifier (OP 3) is connected with the first end of the ninth resistor (R9), the inverting input end of the third operational amplifier (OP 3) is respectively connected with the first end of the tenth resistor (R10) and the first end of the eleventh resistor (R11), and the output end of the third operational amplifier (OP 3) is respectively connected with the second end of the eleventh resistor (R11) and the first end of the twelfth resistor (R12); -a second end of the ninth resistor (R9) receives a second reference voltage (V2); a second end of the tenth resistor (R10) receives the third initial waveform; -a second end of the twelfth resistor (R12) outputs the second bias signal;

The subtracting component (320) includes a fourth operational amplifier (OP 4), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), and a sixteenth resistor (R16); the non-inverting input end of the fourth operational amplifier (OP 4) is respectively connected with the first end of the thirteenth resistor (R13) and the first end of the fourteenth resistor (R14), the inverting input end of the fourth operational amplifier (OP 4) is respectively connected with the first end of the fifteenth resistor (R15) and the first end of the sixteenth resistor (R16), and the output end of the fourth operational amplifier (OP 4) is connected with the second end of the sixteenth resistor (R16) and outputs the third bias signal; -a second terminal of the thirteenth resistor (R13) receives the second bias signal; a second terminal of the fourteenth resistor (R14) is grounded; a second end of the fifteenth resistor (R15) receives the second initial waveform;

The second amplifying assembly (330) includes a fifth operational amplifier (OP 5), a seventeenth resistor (R17), an eighteenth resistor (R18), a nineteenth resistor (R19), and a twentieth resistor (R20); the non-inverting input end of the fifth operational amplifier (OP 5) is connected with the first end of the seventeenth resistor (R17), the inverting input end of the fifth operational amplifier (OP 5) is respectively connected with the first end of the eighteenth resistor (R18) and the first end of the nineteenth resistor (R19), and the output end of the fifth operational amplifier (OP 5) is respectively connected with the second end of the nineteenth resistor (R19) and the first end of the twentieth resistor (R20); -a second terminal of said seventeenth resistor (R17) receives said third bias signal; a second end of the eighteenth resistor (R18) is grounded; a second end of the twentieth resistor (R20) outputs the wide viewing angle driving signal (WVA).

8. The wide-narrow viewing angle switching circuit according to claim 1, wherein the timing controller (100) includes an internal crystal oscillator module (111) and an external frequency setting module (121); the first (GPIO) module (110) generates a reference waveform based on the built-in frequency of the built-in crystal oscillator module (111), the second (GPIO) module (120) generates an adjustment waveform based on the set frequency of the external frequency setting module (121), and generates a demand waveform of a demand frequency via a frequency divider (122) for generating the first initial waveform, the second initial waveform and the third initial waveform.

9. A switching method of a wide-narrow viewing angle switching circuit, which is characterized in that the wide-narrow viewing angle switching circuit comprises a time sequence controller (100), a first driving generation module (200) and a second driving generation module (300); the timing controller (100) comprises a control input end (101), a first output end (102), a second output end (103) and a third output end (104); -said control input (101) receives a viewing angle switching signal (HVA); the first output end (102) is connected with the first drive generation module (200), and the second output end (103) and the third output end (104) are connected with the second drive generation module (300); the switching method of the wide-narrow visual angle switching circuit comprises the following steps:

In the narrow viewing angle mode, the timing controller (100) controls the first output terminal (102) to output a first initial waveform according to the viewing angle switching signal (HVA) as a first effective signal, the first initial waveform is received by the first drive generation module (200), and the first initial waveform is inverted, biased and amplified to generate a narrow viewing angle driving signal (NVA);

in the wide viewing angle mode, the timing controller (100) controls the second output terminal (103) to output a second initial waveform and controls the third output terminal (104) to output a third initial waveform according to the viewing angle switching signal (HVA) as a second effective signal, the second driving generation module (300) receives the second initial waveform and the third initial waveform, and the second initial waveform and the third initial waveform are subjected to inversion, bias, subtraction and amplification to generate a wide viewing angle driving signal (WVA).

10. A display device comprising the wide-narrow viewing angle switching circuit according to any one of claims 1 to 8, and further comprising a first dimming case, a second dimming case, and a display case which are stacked.