Wide and narrow viewing angle switching circuit, switching method and display device

Abstract

The embodiment of the present application provides a wide and narrow viewing angle switching circuit, a switching method and a display device; the wide and narrow viewing angle switching circuit comprises a timing controller, a first drive generation module and a second drive generation module; the timing 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, and the first initial waveform is inverted, biased and amplified to generate a narrow viewing angle driving signal; in a wide viewing angle mode, the second drive generation module receives a second initial waveform and a third initial waveform, and the second initial waveform and the third initial waveform are inverted, biased, subtracted and amplified to generate a wide viewing angle driving signal. Through the hardware circuit design of the timing controller, the embodiment of the present application can save the processor and the digital-to-analog conversion module and other elements, reduce power consumption and reduce cost, and meet the wide and narrow viewing angle driving requirements of the double dimming box.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display driving, in particular to a wide-narrow viewing angle switching circuit, a switching method and a display device. BACKGROUND

[0002] With the continuous progress of liquid crystal display technology, the viewing angle of the display has been widened from about 112° to more than 122°. People enjoy the visual experience brought by wide viewing angle, but also hope to effectively protect commercial secrets and personal privacy to avoid business losses or embarrassment caused by screen information leakage. Therefore, in addition to the demand for wide viewing angle, the display device also needs to have the function of wide-narrow viewing angle switching in many occasions.

[0003] Figure 1 is the waveform diagram of the wide-narrow viewing angle driving signal required by the existing wide-narrow viewing angle switching. Referring to Figure 1 , the display device includes a display box (not shown in the figure) for displaying a picture, a light modulation box (not shown in the figure) for switching wide-narrow viewing angle, and a wide-narrow viewing angle switching circuit (not shown in the figure) for driving the light modulation 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 electrically connected with the light modulation box and the micro control module MCU respectively. The processor MCU sends an SPI signal to communicate with the digital-to-analog conversion module DAC after receiving the viewing angle switching signal, and outputs the wide viewing angle driving signal and the narrow viewing angle driving signal respectively. The light modulation box receives the wide viewing angle driving signal and the narrow viewing angle driving signal respectively, and switches between wide viewing angle and narrow viewing angle for display.

[0004] In order to further improve the display effect of wide viewing angle and narrow viewing angle, the prior art also proposes another display device capable of switching wide-narrow viewing angle, which includes a first light modulation box and a second light modulation box arranged in layers. In the wide viewing angle mode, the first light modulation box and the second light modulation box receive the wide viewing angle driving signal and the 0 potential waveform respectively. The existing wide-narrow viewing angle switching circuit for driving the light modulation box cannot meet the driving requirements of the above-mentioned display device at the same time, and the existing wide-narrow viewing angle switching circuit needs to use the processor MCU and the digital-to-analog conversion module DAC, which requires more electronic components, has high cost, and is complicated to debug. SUMMARY

[0005] Therefore, the present application provides a wide-narrow viewing angle switching circuit, a switching method and a display device, which can save the processor and the digital-to-analog conversion module and other components, reduce power consumption and cost, and meet the wide-narrow viewing angle driving requirements of double light modulation boxes.

[0006] The embodiment of the present application provides a wide and narrow viewing angle switching circuit, which comprises a timing controller and a first drive generation module and a second drive generation module; the timing controller comprises a control input end, a first output end, a second output end and a third output end; the control input end receives a 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 a narrow viewing angle mode, the timing controller controls the first output end to output a first initial waveform according to the viewing angle switching signal being a first effective signal, the first drive generation module receives the first initial waveform, and the first initial waveform is inverted, biased and amplified to generate a narrow viewing angle driving signal; in a wide viewing angle mode, the timing controller controls the second output end to output a second initial waveform and the third output end to output a third initial waveform according to the viewing angle switching signal being a second effective signal, and the second drive generation module receives the second initial waveform and the third initial waveform, and the second initial waveform and the third initial waveform are inverted, biased, subtracted and amplified to generate a wide viewing angle driving signal.

[0007] Specifically, the first drive generation module comprises a first inversion component for inverting and biasing, and a first amplification component for amplifying.

[0008] Specifically, the first inversion component receives the first initial waveform to generate a first bias signal, and the first amplification component receives the first bias signal to generate the narrow viewing angle driving signal.

[0009] Specifically, the second drive generation module comprises a second inversion component for inverting and biasing, a subtraction component for subtracting, and a second amplification component for amplifying.

[0010] Specifically, the second inversion component receives the third initial waveform to generate a second bias signal, the subtraction component receives the second bias signal and the second initial waveform to generate a third bias signal, and the second amplification component receives the third bias signal to generate the wide viewing angle driving signal.

[0011] Specifically, the first inverting component includes a first operational amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor; a non-inverting input terminal of the first operational amplifier is connected with a first end of the first resistor, inverting input terminals of the first operational amplifier are connected with a first end of the second resistor and a first end of the third resistor respectively, and an output terminal of the first operational amplifier is connected with a second end of the third resistor and a first end of the fourth resistor respectively; a second end of the first resistor receives a first reference voltage; a second end of the second resistor receives the first initial waveform; a second end of the fourth resistor outputs the first bias signal; the first amplifying component includes a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; a non-inverting input terminal of the second operational amplifier is connected with a first end of the fifth resistor, inverting input terminals of the second operational amplifier are connected with a first end of the sixth resistor and a first end of the seventh resistor respectively, and an output terminal of the second operational amplifier is connected with a second end of the seventh resistor and a first end of the eighth resistor respectively; a second end of the fifth resistor receives the first bias signal; a second end of the sixth resistor is grounded; and a second end of the eighth resistor outputs the narrow viewing angle driving signal.

[0012] Specifically, the second inverting component includes a third operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; a non-inverting input terminal of the third operational amplifier is connected with a first end of the ninth resistor, inverting input terminals of the third operational amplifier are connected with a first end of the tenth resistor and a first end of the eleventh resistor respectively, and an output terminal of the third operational amplifier is connected with a second end of the eleventh resistor and a first end of the twelfth resistor respectively; a second end of the ninth resistor receives a second reference voltage; a second end of the tenth resistor receives the third initial waveform; a second end of the twelfth resistor outputs the second bias signal; the subtraction component includes a fourth operational amplifier, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor; non-inverting input terminals of the fourth operational amplifier are connected with a first end of the thirteenth resistor and a first end of the fourteenth resistor respectively, inverting input terminals of the fourth operational amplifier are connected with a first end of the fifteenth resistor and a first end of the sixteenth resistor respectively, an output terminal of the fourth operational amplifier is connected with a second end of the sixteenth resistor, and outputs the third bias signal; a second end of the thirteenth resistor receives the second bias signal; a second end of the fourteenth resistor is grounded; a second end of the fifteenth resistor receives the second initial waveform; the second amplification component includes a fifth operational amplifier, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a twentieth resistor; a non-inverting input terminal of the fifth operational amplifier is connected with a first end of the seventeenth resistor, inverting input terminals of the fifth operational amplifier are connected with a first end of the eighteenth resistor and a first end of the nineteenth resistor respectively, and an output terminal of the fifth operational amplifier is connected with a second end of the nineteenth resistor and a first end of the twentieth resistor respectively; a second end of the seventeenth resistor receives the third bias signal; a second end of the eighteenth resistor is grounded; and a second end of the twentieth resistor outputs the wide viewing angle driving signal.

[0013] Specifically, the timing controller includes a built-in crystal oscillator module and an external frequency setting module; a first GPIO module generates a reference waveform based on a built-in frequency of the built-in crystal oscillator module, a second GPIO module generates an adjustment waveform based on a set frequency of the external frequency setting module, and a frequency divider generates a demand waveform of a demand frequency for generating the first initial waveform, the second initial waveform, and the third initial waveform.

[0014] Specifically, the external frequency setting module is connected with an external resistor, the size of an external control signal voltage is changed by adjusting the resistance value of the external resistor, and the frequency of the adjustment waveform generated by the second GPIO module is adjusted accordingly.

[0015] The embodiment of the present application also provides a switching method of the wide-narrow viewing angle switching circuit, the wide-narrow viewing angle switching circuit comprising a timing controller, a first drive generation module and a second drive generation module; the timing controller comprising a control input end, a first output end, a second output end and a third output end; the control input end receiving a viewing angle switching signal; the first output end being connected with the first drive generation module, and the second output end and the third output end both being connected with the second drive generation module; the switching method of the wide-narrow viewing angle switching circuit comprising: in a narrow viewing angle mode, the timing controller controls the first output end to output a first initial waveform according to the viewing angle switching signal being a first effective signal, and the first drive generation module receives the first initial waveform, inverts, biases and amplifies the first initial waveform to generate a narrow viewing angle driving signal; and in a wide viewing angle mode, the timing controller controls the second output end to output a second initial waveform and the third output end to output a third initial waveform according to the viewing angle switching signal being a second effective signal, and the second drive generation module 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 a wide viewing angle driving signal.

[0016] The embodiment of the present application also provides a display device comprising the above wide-narrow viewing angle switching circuit.

[0017] The wide-narrow viewing angle switching circuit, the switching method and the display device provided by the present application can trigger the timing controller to output a first initial waveform, a second initial waveform and a third initial waveform through a port by a viewing angle switching signal, and then generate a required wide viewing angle driving signal and a narrow viewing angle driving signal through a first drive generation module and a second drive generation module, so that the hardware circuit design of the timing controller can omit a processor and a digital-to-analog conversion module and the like, thereby reducing power consumption and cost and meeting the wide-narrow viewing angle driving requirements of a double dimming box.

[0018] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a waveform diagram of the wide viewing angle driving signal and the narrow viewing angle driving signal required by the existing wide-narrow viewing angle switching.

[0020] Figure 2 is a structural schematic diagram of a display device of the first embodiment of the present application.

[0021] Figure 3 is a structural schematic diagram of a wide-narrow viewing angle switching circuit of the first embodiment of the present application.

[0022] Figure 4is Figure 3 a timing diagram of the first initial waveform, the second initial waveform and the third initial waveform in

[0023] Figure 5 is a functional block diagram of the wide-narrow viewing angle switching circuit of the second embodiment of the present application.

[0024] Figure 6 is a circuit connection diagram of the first drive generation module of the wide-narrow viewing angle switching circuit of the third embodiment of the present application.

[0025] Figure 7 is a circuit connection diagram of the second drive generation module of the wide-narrow viewing angle switching circuit of the fourth embodiment of the present application.

[0026] Figure 8 is a partial structure connection diagram of the timing controller of the wide-narrow viewing angle switching circuit of the fifth embodiment of the present application.

[0027] Figure 9 is a flowchart of the switching method of the wide-narrow viewing angle switching circuit of the sixth embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to further clarify the technical means and effects of the present application for achieving the intended purpose, the specific embodiments, methods, steps, structures, features and effects of the wide-narrow viewing angle switching circuit, the driving method and the display device according to the present application are described in detail below in conjunction with the preferred embodiments and the accompanying drawings.

[0029] The foregoing and other technical contents, features and effects of the present application will be clearly presented in the detailed description of the preferred embodiments below in conjunction with the accompanying drawings. Through the description of the specific embodiments, the technical means and effects of the present application for achieving the intended purpose can be understood more deeply and specifically. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present application.

[0030] First Embodiment

[0031] Figure 2 is a structural schematic diagram of the display device of the first embodiment of the present application. Figure 3 is a structural schematic diagram of the wide-narrow viewing angle switching circuit of the first embodiment of the present application. Please refer to Figure 2 and Figure 3The display device comprises a first light-adjusting box 10 and a second light-adjusting box 20 stacked and used for view angle switching, and a display box 30 located at the light-in side of the first light-adjusting box 10 and the second light-adjusting box 20. In the wide view angle mode, the first light-adjusting box 10 and the second light-adjusting box 20 receive a wide view angle driving signal and a 0 potential waveform respectively; in the narrow view angle mode, the first light-adjusting box 10 and the second light-adjusting box 20 receive a narrow view angle driving signal simultaneously. That is, the second light-adjusting box 20 is in the wide view angle display mode initially, and the first light-adjusting box 10 is driven to the wide view angle display mode after receiving the wide view angle driving signal. Both the first light-adjusting box 10 and the second light-adjusting box 20 are driven to the narrow view angle display mode after receiving the narrow view angle driving signal.

[0032] In other embodiments, the first light-adjusting box 10 can also be set to the wide view angle display mode initially, and the second light-adjusting box 20 can be set to the wide view angle display mode after receiving the wide view angle driving signal. This is not limited herein.

[0033] The wide and narrow view angle switching circuit of the embodiment comprises a timing 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; the control input end 101 receives a view angle switching signal HVA; the first output end 102 is connected with the first driving generation module 200, and the second output end 103 and the third output end 104 are both connected with the second driving generation module 300.

[0034] In the narrow view angle mode, the timing controller 100 controls the first output end 102 to output a first initial waveform according to the view angle switching signal HVA being the first effective signal, and the first driving generation module 200 receives the first initial waveform, inverts, biases and amplifies the first initial waveform to generate a narrow view angle driving signal NVA; in the wide view angle mode, the timing controller 100 controls the second output end 103 to output a second initial waveform and the third output end 104 to output a third initial waveform according to the view angle switching signal HVA being the 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 a wide view angle driving signal WVA.

[0035] Specifically, please combine Figure 2 , Figure 3 and Figure 4 , Figure 4 is Figure 3The timing chart of the first initial waveform, the second initial waveform and the third initial waveform in the timing controller 100, the timing controller 100 can generate the first initial waveform, the second initial waveform and the third initial waveform based on the clock signal and output through the corresponding GPIO ports, i.e., the first output end 102, the second output end 103 and the third output end 104, while the first drive generation module 200 and the second drive generation module 300 can generate the wide viewing angle drive signal WVA and the narrow viewing angle drive signal NVA meeting the requirements of the double light boxes by setting the related circuit such as an operational amplifier.

[0036] When the timing controller 100 works in the wide viewing angle mode according to the viewing angle switching signal HVA being the second active signal (e.g., low level), the first output end 102 outputs the 0 potential waveform (GND), the second output end 103 and the third output end 104 normally output the second initial waveform and the third initial waveform respectively, the second drive generation module 300 inverts, biases, subtracts and amplifies the second initial waveform and the third initial waveform to generate and output the wide viewing angle drive signal WVA, which can be output to the first light box 10, while the first drive generation module 200 generates and outputs the 0 potential waveform (GND), which can be output to the second light box 20, which can be used for normal display. At the same time, the first drive generation module 200 does not need to work, which can effectively reduce the power consumption.

[0037] When the timing controller 100 works in the narrow viewing angle mode according to the viewing angle switching signal HVA being the first active signal (e.g., high level), the first output end 102 normally outputs the first initial waveform, the second output end 103 and the third output end 104 output the 0 potential waveform (GND) respectively, the first drive generation module 200 inverts, biases and amplifies the first initial waveform to generate and output the narrow viewing angle drive signal NVA, which can be output to the first light box 10 and the second light box 20 at the same time, which can be used for the display effect of preventing peeping, while the second drive generation module 300 generates and outputs the 0 potential waveform (GND), which does not need to work, which can effectively reduce the power consumption. Thus, the wide and narrow viewing angle switching circuit of the embodiment can be designed by the hardware circuit of the timing controller 100, which can save the processor and the digital-to-analog conversion module and the like, reduce the power consumption and the cost, meet the requirements of the wide and narrow viewing angle drive of the double light boxes, and has a simple and flexible circuit structure without the need to write the processor code.

[0038] Second embodiment

[0039] Please refer to Figure 5 , Figure 5is a functional block diagram of the wide-narrow viewing angle switching circuit of the second embodiment of the present application. The wide-narrow viewing angle switching circuit of the present embodiment has the same basic structure and principle and produces the same technical effects as the first embodiment. For brevity, the present embodiment is not described in detail in respect of the corresponding content of the first embodiment.

[0040] In one embodiment of the present application, as shown in Figure 5 , the first drive generation module 200 includes a first inverting component 210 for inverting and biasing, and a first amplifying component 220 for amplifying.

[0041] In one embodiment of the present application, as shown in Figure 5 , the first inverting component 210 receives the first initial waveform to generate a first bias signal, and the first amplifying component 220 receives the first bias signal to generate the narrow viewing angle drive signal NVA. It can be understood that the present application is not limited to the connection as shown in Figure 5 , for example, the first amplifying component 220 can receive the first initial waveform to generate a first amplifying voltage, and the first inverting component can receive the first amplifying voltage to invert and bias to generate the narrow viewing angle drive signal NVA, etc. Any equivalent changes made by using the content of the present application and the accompanying drawings are included in the protection scope of the present application.

[0042] In one embodiment of the present application, as shown in Figure 5 , the second drive generation module 300 includes a second inverting component 310 for inverting and biasing, a subtraction component 320 for subtracting, and a second amplifying component 330 for amplifying.

[0043] In one embodiment of the present application, as shown in Figure 5 , the second inverting component 310 receives the third initial waveform to generate a second bias signal, the subtraction component 320 receives the second bias signal and the second initial waveform to generate a third bias signal, and the second amplifying component 330 receives the third bias signal to generate the wide viewing angle drive signal WVA. It can be understood that the present application is not limited to the connection as shown in Figure 5 , for example, the second inverting component 310 can receive the third initial waveform to generate a second bias signal, the second amplifying component 330 can receive the second bias signal and the second initial waveform to generate two amplifying signals, and the subtraction component 320 can receive the two amplifying signals to subtract to generate the wide viewing angle drive signal WVA, etc. Any equivalent changes made by using the content of the present application and the accompanying drawings are included in the protection scope of the present application.

[0044] The wide-narrow viewing angle switching circuit of the embodiment, through the first inverting component 210 for inverting and biasing, and the first amplifying component 220 for amplifying, realizes that the first drive generation module 200 generates the narrow viewing angle drive signal NVA; and through the second inverting component 310 for inverting and biasing, the subtraction component 320 for subtracting, and the second amplifying component 330 for amplifying, realizes that the second drive generation module 300 generates the wide viewing angle drive signal WVA.

[0045] Third embodiment

[0046] Please refer to Figure 6 , Figure 6 is the circuit connection diagram of the first drive generation module 200 of the wide-narrow viewing angle switching circuit of the third embodiment of the application. The wide-narrow viewing angle switching circuit of the embodiment has the same basic structure and principle, and the same technical effects as the second embodiment, and for brief description, the part not mentioned in the embodiment can refer to the corresponding content in the second embodiment.

[0047] In an embodiment of the application, as shown in Figure 6 , the first inverting component 210 comprises 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 connected with the first end of the second resistor R2 and the first end of the third resistor R3 respectively, and the output end of the first operational amplifier OP1 is connected with the second end of the third resistor R3 and the first end of the fourth resistor R4 respectively; the second end of the first resistor R1 receives a first reference voltage V1; the second end of the second resistor R2 receives a first initial waveform; the second end of the fourth resistor R4 outputs a first bias signal; the first amplifying component 220 comprises 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 connected with the first end of the sixth resistor R6 and the first end of the seventh resistor R7 respectively, and the output end of the second operational amplifier OP2 is connected with the second end of the seventh resistor R7 and the first end of the eighth resistor R8 respectively; the second end of the fifth resistor R5 receives the first bias signal; the second end of the sixth resistor R6 is grounded; and the second end of the eighth resistor R8 outputs the narrow viewing angle drive signal NVA.

[0048] In an embodiment of the application, as shown in Figure 6 , the first inverting component 210 further comprises a first capacitor C1, the first end of the first capacitor C1 is connected with the second end of the fourth resistor R4, and the second end of the first capacitor C1 is grounded, and the first capacitor C1 plays a role of filtering and stabilizing voltage.

[0049] In an embodiment of the present application, as shown in Figure 6 The first amplification component 220 further comprises a second capacitor C2, a first end of the second capacitor C2 is connected with a second end of the eighth resistor R8, and a second end of the second capacitor C2 is grounded. The second capacitor C2 functions as a filter and voltage stabilizer.

[0050] In an embodiment of the present application, as shown in Figure 6 The first amplification component 220 further comprises a third capacitor C3, a first end of the third capacitor C3 is connected with a first end of the fifth resistor R5, and a second end of the third capacitor C3 is grounded. The third capacitor C3 functions as a filter and voltage stabilizer.

[0051] Specifically, when the timing controller 100 sends the first initial waveform to the first drive generation module 200, the first initial waveform is first subjected to a 1.15V forward bias basic amplification in the inverting amplification circuit where the first operational amplifier OP1 is located, and a first bias signal waveform is output. Finally, the first bias signal waveform is subjected to a forward amplification in the non-inverting amplification circuit where the second operational amplifier OP2 is located, and output. Thus, the required narrow viewing angle driving signal NVA can be obtained.

[0052] Fourth embodiment

[0053] Please refer to Figure 7 , Figure 7 is a circuit connection diagram of the second drive generation module 300 of the wide-narrow viewing angle switching circuit according to the fourth embodiment of the present application. The wide-narrow viewing angle switching circuit according to the present embodiment has the same basic structure, principle, and technical effects as the second embodiment. For brevity, the present embodiment is not described in detail in some aspects, and the corresponding content can be referred to the second embodiment.

[0054] In an embodiment of the present application, as shown in Figure 7 The second inverting component 310 comprises a third operational amplifier OP3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. A non-inverting input end of the third operational amplifier OP3 is connected with a first end of the ninth resistor R9. Inverting input ends of the third operational amplifier OP3 are connected with a first end of the tenth resistor R10 and a first end of the eleventh resistor R11, respectively. An output end of the third operational amplifier OP3 is connected with a second end of the eleventh resistor R11 and a first end of the twelfth resistor R12, respectively. A second end of the ninth resistor R9 receives a second reference voltage V2. A second end of the tenth resistor R10 receives a third initial waveform. A second end of the twelfth resistor R12 outputs a second bias signal.

[0055] The subtraction component 320 comprises 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 with the first end of the thirteenth resistor R13 and the first end of the fourteenth resistor R14 respectively, the inverting input terminal of the fourth operational amplifier OP4 is connected with the first end of the fifteenth resistor R15 and the first end of the sixteenth resistor R16 respectively, the output terminal of the fourth operational amplifier OP4 is connected with the second end of the sixteenth resistor R16 and outputs a third bias signal; the second end of the thirteenth resistor R13 receives the second bias signal; the second end of the fourteenth resistor R14 is grounded; and the second end of the fifteenth resistor R15 receives the second initial waveform;

[0056] The second amplification component 330 comprises 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 terminal of the fifth operational amplifier OP5 is connected with the first end of the seventeenth resistor R17, the inverting input terminal of the fifth operational amplifier OP5 is connected with the first end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19 respectively, and the output terminal of the fifth operational amplifier OP5 is connected with the second end of the nineteenth resistor R19 and the first end of the twentieth resistor R20 respectively; the second end of the seventeenth resistor R17 receives the third bias signal; the second end of the eighteenth resistor R18 is grounded; and the second end of the twentieth resistor R20 outputs a wide viewing angle driving signal WVA.

[0057] In an embodiment of the present application, as shown in Figure 7 The second inverting component 310 further comprises a fourth capacitor C4, the first end of the fourth capacitor C4 is connected with the second end of the twelfth resistor R12, and the second end of the fourth capacitor C4 is grounded, and the fourth capacitor C4 functions as a filter and voltage stabilizer.

[0058] In an embodiment of the present application, as shown in Figure 7 The second amplification component 330 further comprises a fifth capacitor C5, the first end of the fifth capacitor C5 is connected with the second end of the twentieth resistor R20, and the second end of the fifth capacitor C5 is grounded, and the fifth capacitor C5 functions as a filter and voltage stabilizer.

[0059] Specifically, when the timing controller 100 sends the second initial waveform and the third initial waveform to the second drive generation module 300, the third initial waveform first undergoes reverse bias in the inverting amplification circuit where the third operational amplifier OP3 is located, outputs a second bias signal waveform, then undergoes subtraction operation with the second initial waveform in the subtraction circuit where the fourth operational amplifier OP4 is located, outputs a third bias signal waveform, and finally undergoes amplification in the non-inverting amplification circuit where the fifth operational amplifier OP5 is located, and the desired wide viewing angle driving signal WVA can be obtained.

[0060] Fifth embodiment

[0061] Referring to Figure 8 , Figure 8 is a partial structure connection diagram of the timing controller 100 of the wide-narrow viewing angle switching circuit of the fifth embodiment of the present application. The present embodiment provides a wide-narrow viewing angle switching circuit, which has the same basic structure and principle and produces the same technical effects as the first embodiment. For brief description, the part of the present embodiment not mentioned can be referred to the corresponding content in the first embodiment.

[0062] In an embodiment of the present application, as shown in Figure 8 , the timing controller 100 comprises 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 adjusted waveform based on the set frequency of the external frequency setting module 121, and generates a demand waveform of a demand frequency through the frequency divider 122, which is used for generating the first initial waveform, the second initial waveform and the third initial waveform. Wherein, the built-in crystal oscillator module 111 plays a key role in the timing controller 100, which provides a stable clock source, i.e. the reference waveform can be a clock signal, which is used 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 transmission, generation of control signals, etc. The second GPIO module 120 can adjust the set frequency of the external frequency setting module 121 to generate an adjusted waveform, and generate a demand waveform of a demand frequency through the frequency divider 122, which is used for generating the first initial waveform, the second initial waveform and the third initial waveform.

[0063] In an embodiment of the present application, as shown in Figure 8 , the external frequency setting module 121 is connected with an external resistor RT, by adjusting the resistance value of the external resistor RT, the size of the external control signal voltage is changed, and the frequency of the adjusted waveform generated by the second GPIO module 120 is adjusted accordingly. That is, by adjusting the resistance value of the external resistor RT, the size of the external control signal voltage can be changed, the frequency of the adjusted waveform output by the second GPIO module 120 is changed accordingly, and the demand waveform of the demand frequency can be generated through the frequency divider 122, which can be used for generating the first initial waveform, the second initial waveform and the third initial waveform.

[0064] Sixth embodiment

[0065] Based on the same inventive concept, the present application also provides a switching method of a wide-narrow viewing angle switching circuit. Figure 9 is a flowchart of the switching method of the wide-narrow viewing angle switching circuit of the sixth embodiment of the present application.

[0066] The wide-narrow viewing angle switching circuit of the embodiment of the present application comprises a timing 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; the control input end 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 both connected with the second drive generation module 300. The switching method of the wide-narrow viewing angle switching circuit of the embodiment of the present application comprises:

[0067] S100, in the narrow viewing angle mode, the timing controller 100 controls the first output end 102 to output a first initial waveform according to the viewing angle switching signal HVA being a first effective signal, and the first drive generation module 200 receives the first initial waveform, inverts, biases and amplifies the first initial waveform to generate a narrow viewing angle driving signal NVA;

[0068] S200, in the wide viewing angle mode, the timing controller 100 controls the second output end 103 to output a second initial waveform and the third output end 104 to output a third initial waveform according to the viewing angle switching signal HVA being a second effective signal, and the second drive 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 a wide viewing angle driving signal WVA.

[0069] The implementation of the switching method of the wide-narrow viewing angle switching circuit of the embodiment can be referred to the above-mentioned embodiment of the wide-narrow viewing angle switching circuit, and the repeated parts will not be described herein.

[0070] Seventh embodiment

[0071] Based on the same inventive concept, the embodiment of the present application further provides a display device comprising the wide-narrow viewing angle switching circuit provided by the above-mentioned embodiments. The display device further comprises a first light modulation box, a second light modulation box and a display box which are arranged in layers. In the wide viewing angle mode, the first light modulation box and the second light modulation box respectively receive the wide viewing angle driving signal and the 0 potential waveform. The implementation of the display device can be referred to the above-mentioned embodiment one (for reference Figure 2 ), and the repeated parts will not be described herein.

[0072] The wide-narrow viewing angle switching circuit, the switching method and the display device of the present application trigger the timing controller 100 to output the first initial waveform, the second initial waveform and the third initial waveform at the port, and then generate the required wide viewing angle driving signal WVA and narrow viewing angle driving signal NVA through the first drive generation module 200 and the second drive generation module 300. Thus, through the hardware circuit design of the timing controller 100, the processor and the digital-to-analog conversion module and other elements can be omitted, the power consumption and the cost can be reduced, and the wide-narrow viewing angle driving requirements of the double light modulation boxes can be met.

[0073] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with reference to the preferred embodiments above, the present application is not intended to be limited to the preferred embodiments. Any person skilled in the art, without departing from the technical scope of the present application, can make some changes or modifications to the above disclosed technical contents to obtain equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical scope of the present application, shall still fall within the scope of the technical solution of the present application.

Claims

1. A wide-narrow viewing angle switching circuit, characterized by comprising: The application relates to a time sequence controller (100), a first drive generation module (200) and a second drive generation module (300). The time sequence controller (100) comprises a control input end (101), a first output end (102), a second output end (103) and a third output end (104); the control input end (101) receives a view 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 both connected with the second drive generation module (300). In a narrow view angle mode, the time sequence controller (100) controls the first output end (102) to output a first initial waveform according to the view angle switching signal (HVA) being a first effective signal; the first drive generation module (200) receives the first initial waveform, inverses, biases and amplifies the first initial waveform to generate a narrow view angle drive signal (NVA) and simultaneously outputs the narrow view angle drive signal (NVA) to a first light modulation box and a second light modulation box; and the time sequence controller (100) also controls the second output end (103) and the third output end (104) to output 0 potential waveforms so that the second drive generation module (300) outputs the 0 potential waveforms to the first light modulation box. In a wide view angle mode, the time sequence controller (100) controls the second output end (103) to output a second initial waveform and controls the third output end (104) to output a third initial waveform according to the view angle switching signal (HVA) being a second effective signal; the second drive generation module (300) receives the second initial waveform and the third initial waveform, inverses, biases, subtracts and amplifies the second initial waveform and the third initial waveform to generate a wide view angle drive signal (WVA) and outputs the wide view angle drive signal (WVA) to the first light modulation box; and the time sequence controller (100) also controls the first output end (102) to output 0 potential waveforms so that the first drive generation module (200) outputs the 0 potential waveforms to the second light modulation box.

2. The wide-narrow viewing angle switching circuit according to claim 1, wherein The first drive generation module (200) comprises a first inversion component (210) for inverting and biasing and a first amplification component (220) for amplifying.

3. The wide-narrow viewing angle switching circuit according to claim 2, wherein The first inversion component (210) receives the first initial waveform to generate a first bias signal; and the first amplification component (220) receives the first bias signal to generate the narrow view angle drive signal (NVA).

4. The wide-narrow viewing angle switching circuit according to claim 1, wherein The second drive generation module (300) comprises a second inversion component (310) for inverting and biasing, a subtraction component (320) for subtracting and a second amplification component (330) for amplifying.

5. The wide-narrow viewing angle switching circuit according to claim 4, wherein The second inversion component (310) receives the third initial waveform to generate a second bias signal; the subtraction component (320) receives the second bias signal and the second initial waveform to generate a third bias signal; and the second amplification component (330) receives the third bias signal to generate the wide view angle drive signal (WVA).

6. The wide-narrow viewing angle switching circuit according to claim 3, wherein The first inverting component (210) comprises 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 connected with the first end of the second resistor (R2) and the first end of the third resistor (R3) respectively, and the output end of the first operational amplifier (OP1) is connected with the second end of the third resistor (R3) and the first end of the fourth resistor (R4) respectively; 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; and the second end of the fourth resistor (R4) outputs the first bias signal; The first amplifying component (220) comprises 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 connected with the first end of the sixth resistor (R6) and the first end of the seventh resistor (R7) respectively, and the output end of the second operational amplifier (OP2) is connected with the second end of the seventh resistor (R7) and the first end of the eighth resistor (R8) respectively; the second end of the fifth resistor (R5) receives the first bias signal; the second end of the sixth resistor (R6) is grounded; and the second end of the eighth resistor (R8) outputs the narrow viewing angle driving signal (NVA).

7. The wide-narrow viewing angle switching circuit according to claim 5, wherein The second inverting component (310) comprises 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 connected with the first end of the tenth resistor (R10) and the first end of the eleventh resistor (R11) respectively, and the output end of the third operational amplifier (OP3) is connected with the second end of the eleventh resistor (R11) and the first end of the twelfth resistor (R12) respectively; 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; and the second end of the twelfth resistor (R12) outputs the second bias signal; The subtraction component (320) comprises 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 with the first end of the thirteenth resistor (R13) and the first end of the fourteenth resistor (R14) respectively, the inverting input terminal of the fourth operational amplifier (OP4) is connected with the first end of the fifteenth resistor (R15) and the first end of the sixteenth resistor (R16) respectively, the output terminal of the fourth operational amplifier (OP4) is connected with the second end of the sixteenth resistor (R16) and outputs the third bias signal; the second end of the thirteenth resistor (R13) receives the second bias signal; the second end of the fourteenth resistor (R14) is grounded; the second end of the fifteenth resistor (R15) receives the second initial waveform; The second amplification component (330) comprises 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 terminal of the fifth operational amplifier (OP5) is connected with the first end of the seventeenth resistor (R17), the inverting input terminal of the fifth operational amplifier (OP5) is connected with the first end of the eighteenth resistor (R18) and the first end of the nineteenth resistor (R19) respectively, the output terminal of the fifth operational amplifier (OP5) is connected with the second end of the nineteenth resistor (R19) and the first end of the twentieth resistor (R20) respectively; 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 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) comprises a built-in crystal oscillator module (111) and an external frequency setting module (121); a first (GPIO) module (110) generates a reference waveform based on the built-in frequency of the built-in crystal oscillator module (111), a 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 through a frequency divider (122) to be used 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, characterized by, The wide and narrow viewing angle switching circuit 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 terminal (101), a first output terminal (102), a second output terminal (103), and a third output terminal (104); the control input terminal (101) receives a viewing angle switching signal (HVA); the first output terminal (102) is connected to the first drive generation module (200), and the second output terminal (103) and the third output terminal (104) are both connected to the second drive generation module (300); the switching method of the wide and narrow viewing angle switching circuit includes: In narrow viewing angle mode, the timing controller (100) controls the first output terminal (102) to output a first initial waveform based on the viewing angle switching signal (HVA) as the first valid signal. The first drive generation module (200) receives the first initial waveform, inverts, biases, and amplifies the first initial waveform to generate a narrow viewing angle drive signal (NVA), and simultaneously outputs it to the first dimming box and the second dimming box. The timing controller (100) also controls the second output terminal (103) and the third output terminal (104) to output a 0 potential waveform, so that the second drive generation module (300) outputs a 0 potential waveform to the first dimming box. In wide-view mode, the timing controller (100) controls the second output terminal (103) to output a second initial waveform based on the viewing angle switching signal (HVA) being the second valid signal, and also controls the third output terminal (104) to output a third initial waveform. The second drive 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 a wide-view drive signal (WVA), and outputs it to the first dimming box. The timing controller (100) also controls the first output terminal (102) to output a 0 potential waveform, so that the first drive generation module (200) outputs a 0 potential waveform to the second dimming box.

10. A display device, characterized by comprising: The device includes the wide and narrow viewing angle switching circuit as described in any one of claims 1-8, and further includes a first dimming box, a second dimming box, and a display box that are stacked together.

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