Anti-peeping screen driving circuit and anti-peeping display device

Abstract

The embodiment of the utility model discloses a peep-proof screen driving circuit and a peep-proof display device. The peep-proof screen driving circuit comprises a first waveform generation module, a second waveform generation module and a waveform superposition module, the first waveform generation module is used for generating a first wide-view-angle waveform or a first narrow-view-angle waveform according to a view angle adjustment signal output by the view angle adjustment signal output end; the second waveform generation module is used for generating a second wide-view-angle waveform or a second narrow-view-angle waveform according to a view angle adjustment signal output by the view angle adjustment signal output end; the waveform superposition module is used for generating a wide-view-angle adjustment waveform according to the first wide-view-angle waveform and the second wide-view-angle waveform, or generating a narrow-view-angle adjustment waveform according to the first narrow-view-angle waveform and the second narrow-view-angle waveform. According to the scheme, the cost of the peep-proof screen driving circuit can be reduced, so that the market competitiveness of the peep-proof display device is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to display panel technical field, especially relate to a kind of anti-peep screen drive circuit and anti-peep display device. BACKGROUND

[0002] At present, due to the demand of consumers for privacy protection, anti-peep screen is generated, that is, the anti-peep display screen with switchable wide and narrow viewing angles. However, the anti-peep screen drive circuit of the anti-peep screen in the market at present needs a digital-to-analog converter to generate a wide and narrow viewing angle adjustment waveform, which increases the cost of the anti-peep screen drive circuit and reduces the market competitiveness of the anti-peep display screen. UTILITY MODEL CONTENT

[0003] The embodiment of the utility model provides an anti-peep screen drive circuit and an anti-peep display device to reduce the cost of the anti-peep screen drive circuit and improve the market competitiveness of the anti-peep display device.

[0004] In the first aspect, the utility model embodiment provides an anti-peep screen drive circuit, which comprises:

[0005] A first waveform generating module is connected with the viewing angle adjustment signal output end to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output end to generate a first wide viewing angle waveform or a first narrow viewing angle waveform;

[0006] A second waveform generating module is connected with the viewing angle adjustment signal output end to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output end to generate a second wide viewing angle waveform or a second narrow viewing angle waveform;

[0007] A waveform superposition module is connected with the first waveform generating module and the second waveform generating module to receive the first wide viewing angle waveform and the second wide viewing angle waveform to generate a wide viewing angle adjustment waveform, or to receive the first narrow viewing angle waveform and the second narrow viewing angle waveform to generate a narrow viewing angle adjustment waveform.

[0008] Optionally, the first waveform generating module comprises:

[0009] A first initial waveform generating unit is connected with the viewing angle adjustment signal output end to receive the viewing angle adjustment signal to generate a first wide viewing angle initial waveform or a first narrow viewing angle initial waveform;

[0010] A first amplifying unit is connected with the first initial waveform generating unit to amplify the first wide viewing angle initial waveform or the first narrow viewing angle initial waveform;

[0011] a filter unit connected with the first amplification unit, filtering the amplified first wide-view-angle initial waveform to generate the first wide-view-angle waveform, or filtering the amplified first narrow-view-angle initial waveform to generate the first narrow-view-angle waveform;

[0012] The filter unit is connected with the waveform superposition module.

[0013] Optionally, the first initial waveform generating unit comprises a micro control chip.

[0014] The control end of the micro control chip is connected with the view angle adjustment signal output end, and the signal output end of the micro control chip is connected with the first amplification unit.

[0015] Optionally, the first amplification unit comprises a first resistor, a second resistor, a third resistor and a first amplifier.

[0016] The signal output end of the micro control chip is connected with the first end of the first resistor, the second end of the first resistor is connected with the positive input end of the first amplifier, the first end of the second resistor is grounded, the second end of the second resistor and the negative input end of the first amplifier are both connected with the first end of the third resistor, and the second end of the third resistor and the filter unit are both connected with the output end of the first amplifier.

[0017] Optionally, the filter unit comprises a fourth resistor, a fifth resistor, a first capacitor and a second capacitor.

[0018] The first end of the fourth resistor is connected with the output end of the first amplifier, the second end of the fourth resistor and the first end of the first capacitor are both connected with the first end of the fifth resistor, the second end of the fifth resistor and the first end of the second capacitor are both connected with the waveform superposition module, and the second end of the first capacitor and the second end of the second capacitor are grounded.

[0019] Optionally, the amplification multiple of the first amplifier is the ratio of the resistance value of the third resistor to the resistance value of the second resistor.

[0020] Optionally, the second waveform generating module comprises:

[0021] a direct current power supply unit, outputting a first voltage at the output end;

[0022] A voltage selection unit is connected with the output end of the direct current power supply unit, a control end of the voltage selection unit is connected with the viewing angle adjustment signal output end, and the voltage selection unit is connected with the second amplification unit; the control end of the voltage selection unit receives the viewing angle adjustment signal to output the first voltage to the second amplification unit, or receives the viewing angle adjustment signal to divide the first voltage to generate a second voltage and output the second voltage to the second amplification unit;

[0023] The second amplification unit amplifies the received first voltage to output the second wide viewing angle waveform, or amplifies the received second voltage to output the second narrow viewing angle waveform.

[0024] The second amplification unit is connected with the waveform superposition module.

[0025] Optionally, the direct current power supply unit comprises a DCDC power supply.

[0026] The voltage selection unit comprises a sixth resistor, a seventh resistor and a selector.

[0027] The second amplification unit comprises a second amplifier.

[0028] The output end of the DCDC power supply and the first end of the sixth resistor are both connected with the first input end of the selector, the second end of the sixth resistor and the first end of the seventh resistor are both connected with the second input end of the selector, the second end of the seventh resistor is grounded, the control end of the selector is connected with the viewing angle adjustment signal output end, the output end of the selector is connected with the positive input end of the second amplifier, and the negative input end and the output end of the second amplifier are both connected with the waveform superposition module.

[0029] Optionally, the waveform superposition module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third amplifier.

[0030] The first end of the eighth resistor is connected with the second waveform generation module, the second end of the eighth resistor and the negative input end of the third amplifier are both connected with the first end of the ninth resistor, the first end of the tenth resistor is connected with the first waveform generation module, the second end of the tenth resistor and the first end of the eleventh resistor are both connected with the positive output end of the third amplifier, the second end of the eleventh resistor is grounded, and the second end of the ninth resistor and the output end of the third amplifier are connected.

[0031] In a second aspect, the utility model embodiment further provides a peep-proof display device, which comprises the peep-proof screen driving circuit provided by any of the utility model embodiments.

[0032] The utility model embodiment produces first wide viewing angle waveform or first narrow viewing angle waveform according to the viewing angle adjusting signal output terminal output viewing angle adjusting signal through first waveform generating module, the second wide viewing angle waveform or the second narrow viewing angle waveform is produced according to the viewing angle adjusting signal output terminal output viewing angle adjusting signal through second waveform generating module, and the wide viewing angle adjusting waveform is produced according to first wide viewing angle waveform and second wide viewing angle waveform, or the narrow viewing angle adjusting waveform is produced according to first narrow viewing angle waveform and second narrow viewing angle waveform according to waveform superposition module. Thus, the utility model embodiment provides the peep-proof screen drive circuit can solve the problem that the peep-proof screen drive circuit cost is high due to the digital analog converter of the prior peep-proof screen drive circuit produces wide narrow viewing angle adjusting waveform, reduces the cost of the peep-proof screen drive circuit, thereby improves the market competitiveness of the peep-proof display device. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the utility model embodiment, the following will briefly introduce the drawing needed to be used in the embodiment description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0034] Figure 1 The structure schematic diagram of a peep-proof screen drive circuit provided by the utility model embodiment is shown in the figure.

[0035] Figure 2 The structure schematic diagram of another peep-proof screen drive circuit provided by the utility model embodiment is shown in the figure.

[0036] Figure 3 The period schematic diagram of a first wide viewing angle initial waveform provided by the utility model embodiment is shown in the figure.

[0037] Figure 4 The period schematic diagram of a first narrow viewing angle initial waveform provided by the utility model embodiment is shown in the figure.

[0038] Figure 5 The structure schematic diagram of another peep-proof screen drive circuit provided by the utility model embodiment is shown in the figure.

[0039] Figure 6 The period schematic diagram of a first wide viewing angle initial waveform provided by the utility model embodiment is shown in the figure.

[0040] Figure 7 The period schematic diagram of a first wide viewing angle waveform provided by the utility model embodiment is shown in the figure.

[0041] Figure 8 The period schematic diagram of a first narrow viewing angle initial waveform provided by the utility model embodiment is shown in the figure.

[0042] Figure 9 A first narrow viewing angle waveform cycle schematic diagram is provided for the embodiment of the present application.

[0043] Figure 10 A first voltage waveform schematic diagram is provided for the embodiment of the present application.

[0044] Figure 11 A second wide viewing angle waveform schematic diagram is provided for the embodiment of the present application.

[0045] Figure 12 A second voltage waveform schematic diagram is provided for the embodiment of the present application.

[0046] Figure 13 A second narrow viewing angle waveform schematic diagram is provided for the embodiment of the present application.

[0047] Figure 14 A wide viewing angle adjustment waveform schematic diagram is provided for the embodiment of the present application.

[0048] Figure 15 A narrow viewing angle adjustment waveform schematic diagram is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0050] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] Figure 1A schematic diagram of a privacy screen driving circuit provided in an embodiment of this utility model is shown below. Figure 1 As shown, the privacy screen driving circuit includes: a first waveform generation module 110, which is connected to the viewing angle adjustment signal output terminal HVA to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA and generate a first wide viewing angle waveform or a first narrow viewing angle waveform; a second waveform generation module 120, which is connected to the viewing angle adjustment signal output terminal HVA to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA and generate a second wide viewing angle waveform or a second narrow viewing angle waveform; and a waveform superposition module 130, which is connected to the first waveform generation module 110 and the second waveform generation module 120 to receive the first wide viewing angle waveform and the second wide viewing angle waveform to generate a wide viewing angle adjustment waveform, or to receive the first narrow viewing angle waveform and the second narrow viewing angle waveform to generate a narrow viewing angle adjustment waveform.

[0052] The viewing angle adjustment signal output terminal HVA can output a signal—the viewing angle adjustment signal—to instruct the display screen to adjust to a wider or narrower viewing angle. The viewing angle adjustment signal includes a wide viewing angle adjustment signal to instruct the display screen to adjust to a wider viewing angle and a narrow viewing angle adjustment signal to instruct the display screen to adjust to a narrower viewing angle.

[0053] Specifically, the first waveform generation module 110 can generate a preset wide-viewing-angle initial waveform based on the wide-viewing-angle adjustment signal, and amplify and filter the generated wide-viewing-angle initial waveform to generate a first wide-viewing-angle waveform; or it can generate a preset narrow-viewing-angle initial waveform based on the narrow-viewing-angle adjustment signal, and amplify and filter the generated narrow-viewing-angle initial waveform to generate a first narrow-viewing-angle waveform. Simultaneously, the second waveform generation module 120 can generate a preset constant voltage, and amplify the generated constant voltage based on the wide-viewing-angle adjustment signal to generate a second wide-viewing-angle waveform; or it can divide and amplify the generated constant voltage based on the wide-viewing-angle adjustment signal to generate a second narrow-viewing-angle waveform. The waveform superposition module 130 can superimpose the first wide-viewing-angle waveform and the second wide-viewing-angle waveform to generate a wide-viewing-angle adjustment waveform that can adjust the display screen viewing angle to a wide angle; or it can superimpose the first narrow-viewing-angle waveform and the second narrow-viewing-angle waveform to generate a narrow-viewing-angle adjustment waveform that can adjust the display screen viewing angle to a narrow angle.

[0054] According to the connection relationship, the working process of the privacy screen driving circuit is described as follows: if the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a wide viewing angle adjustment signal, the first waveform generating module 110 generates a first wide viewing angle waveform according to the wide viewing angle adjustment signal, the second waveform generating module 120 generates a second wide viewing angle waveform according to the wide viewing angle adjustment signal, and the waveform superposition module 130 generates a wide viewing angle adjustment waveform according to the first wide viewing angle waveform and the second wide viewing angle waveform. If the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a narrow viewing angle adjustment signal, the first waveform generating module 110 generates a first narrow viewing angle waveform according to the narrow viewing angle adjustment signal, the second waveform generating module 120 generates a second narrow viewing angle waveform according to the narrow viewing angle adjustment signal, and the waveform superposition module 130 generates a narrow viewing angle adjustment waveform according to the first narrow viewing angle waveform and the second narrow viewing angle waveform.

[0055] According to the connection relationship, the working process of the privacy screen driving circuit is described as follows: if the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a wide viewing angle adjustment signal, the first waveform generating module 110 generates a first wide viewing angle waveform according to the wide viewing angle adjustment signal, the second waveform generating module 120 generates a second wide viewing angle waveform according to the wide viewing angle adjustment signal, and the waveform superposition module 130 generates a wide viewing angle adjustment waveform according to the first wide viewing angle waveform and the second wide viewing angle waveform. If the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a narrow viewing angle adjustment signal, the first waveform generating module 110 generates a first narrow viewing angle waveform according to the narrow viewing angle adjustment signal, the second waveform generating module 120 generates a second narrow viewing angle waveform according to the narrow viewing angle adjustment signal, and the waveform superposition module 130 generates a narrow viewing angle adjustment waveform according to the first narrow viewing angle waveform and the second narrow viewing angle waveform. By virtue of the privacy screen driving circuit provided in the embodiment of the utility model, the problem that the existing privacy screen driving circuit has high cost due to the use of a digital-to-analog converter to generate a wide or narrow viewing angle adjustment waveform is solved, the cost of the privacy screen driving circuit is reduced, and thus the market competitiveness of the privacy display device is improved.

[0056] On the basis of the above-mentioned implementation force, optionally, Figure 2 Another privacy screen driving circuit provided in the embodiment of the utility model is shown in a structural schematic view. As shown in Figure 2 The first waveform generating module 110 includes: a first initial waveform generating unit 111, which is connected with the viewing angle adjustment signal output terminal HVA to receive a viewing angle adjustment signal and generate a first wide viewing angle initial waveform or a first narrow viewing angle initial waveform; a first amplification unit 112, which is connected with the first initial waveform generating unit 111 to amplify the first wide viewing angle initial waveform or the first narrow viewing angle initial waveform; and a filtering unit 113, which is connected with the first amplification unit 112 to filter the amplified first wide viewing angle initial waveform and generate a first wide viewing angle waveform, or filter the amplified first narrow viewing angle initial waveform and generate a first narrow viewing angle waveform; the filtering unit 113 is connected with the waveform superposition module 130.

[0057] Specifically, the first initial waveform generating unit 111 can generate a first wide-viewing-angle initial waveform according to a wide-viewing-angle adjusting signal. The first wide-viewing-angle initial waveform in each period is at a 0 level in a first time period t1 and includes a plurality of wide-level pulses in a second time period t2, and the first time period t1 is equal to the second time period t2. Exemplarily, Figure 3 A cycle schematic diagram of the first wide-viewing-angle initial waveform provided by the embodiment of the utility model is shown in the figure, Figure 3 As shown in the figure, the second time period t2 includes a PWM wave of 0-3V with a duty cycle of 83.4%.

[0058] The first initial waveform generating unit 111 can generate a first narrow-viewing-angle initial waveform according to a narrow-viewing-angle adjusting signal. The first narrow-viewing-angle initial waveform in each period is at a 0 level in a first time period t1 and includes a plurality of narrow-level pulses in a second time period t2, and the first time period t1 is equal to the second time period t2. Exemplarily, Figure 4 A cycle schematic diagram of the first narrow-viewing-angle initial waveform provided by the embodiment of the utility model is shown in the figure, Figure 4 As shown in the figure, the second time period t2 includes a PWM wave of 0-3V with a duty cycle of 33.4%.

[0059] The first amplifying unit 112 can amplify the first wide-viewing-angle initial waveform and the first narrow-viewing-angle initial waveform to increase the amplitude of each pulse wave of the first wide-viewing-angle initial waveform or the first narrow-viewing-angle initial waveform in the second time period t2.

[0060] The filtering unit 113 can decompose the waveform of the first wide-viewing-angle initial waveform and the first narrow-viewing-angle initial waveform in the second time period t2 into a direct current component and an alternating current component, and the direct current level amplitude of the direct current component is the product of the pulse level amplitude and the pulse level duty cycle. The filtering unit 113 can filter out the alternating current component decomposed from the first wide-viewing-angle initial waveform and the first narrow-viewing-angle initial waveform, and output the direct current component decomposed from the first wide-viewing-angle initial waveform and the first narrow-viewing-angle initial waveform.

[0061] On the basis of the above-mentioned implementation force, optionally, Figure 5 A structure schematic diagram of another anti-peep screen driving circuit provided by the embodiment of the utility model is shown in the figure, Figure 5 As shown in the figure, the first initial waveform generating unit 111 includes a micro control chip U1; the control end of the micro control chip U1 is connected with a viewing angle adjusting signal output end HVA, and the signal output end of the micro control chip U1 is connected with the first amplifying unit 112.

[0062] The first amplifying unit 112 includes a first resistor R1, a second resistor R2, a third resistor R3 and a first amplifier D1.

[0063] The signal output end of the micro control chip U1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the positive input end of the first amplifier D1, the first end of the second resistor R2 is grounded, the second end of the second resistor R2 and the negative input end of the first amplifier D1 are both connected with the first end of the third resistor R3, the second end of the third resistor R3 and the filter unit 113 are both connected with the output end of the first amplifier D1.

[0064] The amplification multiple of the first amplifier D1 is the ratio of the resistance value of the third resistor R3 to the resistance value of the second resistor R2.

[0065] The filter unit 113 comprises a fourth resistor R4, a fifth resistor R5, a first capacitor C1 and a second capacitor C2.

[0066] The first end of the fourth resistor R4 is connected with the output end of the first amplifier D1, the second end of the fourth resistor R4 and the first end of the first capacitor C1 are both connected with the first end of the fifth resistor R5, the second end of the fifth resistor R5 and the first end of the second capacitor C2 are both connected with the waveform superposition module 130, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are grounded.

[0067] If the viewing angle adjustment signal outputted by the viewing angle adjustment signal output end HVA is a wide viewing angle adjustment signal, the micro control chip U1 generates a first wide viewing angle initial waveform according to the wide viewing angle adjustment signal, and the first wide viewing angle initial waveform is a periodic waveform. Figure 3 The micro control chip U1 outputs the first wide viewing angle initial waveform to the first amplifier D1, and the amplification multiple of the first amplifier D1 is the ratio of the resistance value of the third resistor R3 to the resistance value of the second resistor R2. Figure 6 A periodic schematic view of the first wide viewing angle initial waveform amplified by the embodiment of the utility model, Figure 6 The ratio of the resistance value of the third resistor R3 to the resistance value of the second resistor R2 is 3. Figure 3 The waveform of the first wide viewing angle initial waveform of each period in the first wide viewing angle initial waveform is amplified to a PWM wave of 0-12V in the second time period t2. The first amplifier D1 outputs the amplified first wide viewing angle initial waveform to the filter unit 113, the filter unit 113 is a second-order filter circuit, the filter unit 113 decomposes the waveform of the amplified first wide viewing angle initial waveform in the second time period t2 into a direct current component and an alternating current component, and filters out the decomposed alternating current component. The direct current level amplitude of the direct current component obtained by the filter unit 113 decomposing the waveform of the amplified first wide viewing angle initial waveform in the second time period t2 is the product of the pulse level amplitude and the pulse level duty cycle. Figure 7 A periodic schematic view of the first wide viewing angle waveform provided by the embodiment of the utility model, Figure 7 is Figure 6The first wide-view-angle waveform generated by filtering the amplified first wide-view-angle initial waveform, the DC level amplitude of the DC component of the waveform decomposition of the amplified first wide-view-angle initial waveform at the second time period t2 is 83.4%*12=10V, so that the first wide-view-angle waveform is a square wave maintaining 0V level at the first time period t1 and maintaining 10V at the second time period t2.

[0068] If the view angle adjusting signal output from the view angle adjusting signal output terminal HVA is a narrow-view-angle adjusting signal, the micro control chip U1 generates a first narrow-view-angle initial waveform according to the narrow-view-angle adjusting signal, and the first narrow-view-angle initial waveform is a periodic waveform. Figure 4 As shown in the drawing. The micro control chip U1 outputs the first narrow-view-angle initial waveform to the first amplifier D1, and the amplification multiple of the first amplifier D1 is the ratio of the resistance value of the third resistor R3 to the resistance value of the second resistor R2. Figure 8 A periodic diagram of the first narrow-view-angle initial waveform amplified by the micro control chip U1 is shown in the drawing. Figure 8 In the drawing, the ratio of the resistance value of the third resistor R3 to the resistance value of the second resistor R2 is 3, Figure 4 The waveform of the first narrow-view-angle initial waveform at the second time period t2 is amplified to a PWM wave of 0-12V. The first amplifier D1 outputs the amplified first narrow-view-angle initial waveform to the filtering unit 113, and the filtering unit 113 is a second-order filtering circuit. The filtering unit 113 decomposes the waveform of the amplified first narrow-view-angle initial waveform at the second time period t2 into a DC component and an AC component, and filters out the decomposed AC component. The DC level amplitude of the DC component obtained by the filtering unit 113 decomposing the waveform of the amplified first narrow-view-angle initial waveform at the second time period t2 is the product of the pulse level amplitude and the pulse level duty cycle. Figure 9 A periodic diagram of the first narrow-view-angle waveform is shown in the drawing. Figure 9 As shown in the drawing. Figure 8 The first narrow-view-angle waveform generated by filtering the amplified first narrow-view-angle initial waveform, the DC level amplitude of the DC component of the waveform decomposition of the amplified first narrow-view-angle initial waveform at the second time period t2 is 33.4%*12=4V, so that the first narrow-view-angle waveform is a square wave maintaining 0V level at the first time period t1 and maintaining 4V at the second time period t2.

[0069] On the basis of the above-mentioned embodiment, optionally, with reference to Figure 2The second waveform generating module 120 comprises: a direct current power supply unit 121, an output end of which outputs a first voltage; a voltage selection unit 122 and a second amplification unit 123, the voltage selection unit 122 being connected with the output end of the direct current power supply unit 121, a control end of the voltage selection unit 122 being connected with a viewing angle adjustment signal output end HVA, the voltage selection unit 122 being connected with the second amplification unit 123; the control end of the voltage selection unit 122 receiving the viewing angle adjustment signal to output the first voltage to the second amplification unit, or receiving the viewing angle adjustment signal to divide the first voltage to generate a second voltage and output the second voltage to the second amplification unit; the second amplification unit 123 amplifying the received first voltage to output a second wide viewing angle waveform, or amplifying the received second voltage to output a second narrow viewing angle waveform; the second amplification unit 123 being connected with a waveform superposition module 130.

[0070] The direct current power supply unit 121 can generate a pre-set constant voltage, i.e. the first voltage. The voltage selection unit 122 outputs the first voltage to the second amplification unit 123 according to the wide viewing angle adjustment signal, and divides the first voltage to generate the second voltage according to the narrow viewing angle adjustment signal and outputs the second voltage to the second amplification unit 123. The second amplification unit 123 can amplify the input voltage by one time to output a stable voltage, i.e. can amplify the first voltage by one time to output a stable second wide viewing angle waveform, and can amplify the second voltage by one time to output a stable second narrow viewing angle waveform.

[0071] Specifically, continuing to refer to Figure 5 The direct current power supply unit 121 comprises a DCDC power supply U2; the voltage selection unit 122 comprises a sixth resistor R6, a seventh resistor R7 and a selector K; and the second amplification unit 123 comprises a second amplifier D2.

[0072] The output end of the DCDC power supply U2 and the first end of the sixth resistor R6 are both connected with the first input end of the selector K, the second end of the sixth resistor R6 and the first end of the seventh resistor R7 are both connected with the second input end of the selector K, the second end of the seventh resistor R7 is grounded, the control end of the selector K is connected with the viewing angle adjustment signal output end HVA, the output end of the selector K is connected with the positive input end of the second amplifier D2, and the negative input end and the output end of the second amplifier D2 are both connected with the waveform superposition module 130.

[0073] Exemplarily, Figure 10 A waveform diagram of the first voltage provided by the embodiment of the utility model is shown as Figure 10As shown, the DCDC power supply U2 outputs a constant first voltage of 5V. If the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a wide viewing angle adjustment signal, the selector K selects the first input terminal and the output terminal to be conductive, so that the first voltage output by the DCDC power supply U2 is output to the second amplifier D2 through the first input terminal of the selector K, and the second amplifier D2 amplifies the input first voltage by one time to output a second wide viewing angle waveform. Figure 11 A waveform schematic diagram of a second wide viewing angle waveform provided by the embodiment of the utility model, Figure 11 For Figure 10 The second wide viewing angle waveform generated after the first voltage is amplified.

[0074] If the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal HVA is a narrow viewing angle adjustment signal, the second input terminal and the output terminal are selected to be conductive, so that the second voltage generated by the sixth resistor R6 and the seventh resistor R7 dividing the first voltage is output to the second amplifier D2 through the second input terminal of the selector K, and the second amplifier D2 amplifies the input second voltage by one time to output a second narrow viewing angle waveform.

[0075] In addition, the sixth resistor R6 and the seventh resistor R7 divide the first voltage to generate the second voltage, the second voltage = the voltage division coefficient * the first voltage, the voltage division coefficient = the seventh resistor R7 resistance value / (the sixth resistor R6 resistance value + the seventh resistor R7 resistance value).

[0076] Exemplarily, Figure 12 A waveform schematic diagram of a second voltage provided by the embodiment of the utility model, Figure 12 For Figure 10 The second voltage generated after the first voltage is divided. Figure 13 A waveform schematic diagram of a second narrow viewing angle waveform provided by the embodiment of the utility model, Figure 13 For Figure 12 The second narrow viewing angle waveform generated after the second voltage is amplified.

[0077] On the basis of the above-mentioned implementation force, optionally, with reference to Figure 5 The waveform superposition module 130 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a third amplifier D3.

[0078] The first end of the eighth resistor R8 is connected with the second waveform generating module 120, the second end of the eighth resistor R8 and the negative input end of the third amplifier D3 are both connected with the first end of the ninth resistor R9, the first end of the tenth resistor R10 is connected with the first waveform generating module 110, the second end of the tenth resistor R10 and the first end of the eleventh resistor R11 are both connected with the positive output end of the third amplifier D3, the second end of the eleventh resistor R11 is grounded, and the second end of the ninth resistor R9 and the output end of the third amplifier D3 are connected.

[0079] Exemplarily, Figure 14 A wide viewing angle adjusting waveform provided by the utility model embodiment is shown in the figure, Figure 14 The wide viewing angle adjusting waveform generated after superposition by the waveform superposition module 130, Figure 7 And Figure 11 The wide viewing angle adjusting waveform generated after superposition by the waveform superposition module 130. Figure 15 A narrow viewing angle adjusting waveform provided by the utility model embodiment is shown in the figure, Figure 15 The narrow viewing angle adjusting waveform generated after superposition by the waveform superposition module 130, Figure 9 And Figure 13 The narrow viewing angle adjusting waveform generated after superposition by the waveform superposition module 130.

[0080] The utility model embodiment further provides a kind of peep-proof display device, the peep-proof display device includes the peep-proof screen drive circuit provided by any embodiment of the utility model, thus has the beneficial effects of the peep-proof screen drive circuit provided by any embodiment of the utility model, and the present scheme does not repeat here.

[0081] It should be understood that the steps can be reordered, added, or deleted using the various forms of the processes shown above. For example, the steps described in the utility model can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the utility model can be achieved, which are not limited herein.

[0082] The above detailed implementation does not constitute a limitation on the protection scope of the utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A privacy screen drive circuit, characterized by, include: A first waveform generation module is connected to a viewing angle adjustment signal output terminal to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal and generate a first wide viewing angle waveform or a first narrow viewing angle waveform. The second waveform generation module is connected to the viewing angle adjustment signal output terminal to receive the viewing angle adjustment signal output by the viewing angle adjustment signal output terminal and generate a second wide viewing angle waveform or a second narrow viewing angle waveform. A waveform overlay module is connected to the first waveform generation module and the second waveform generation module to receive the first wide-angle waveform and the second wide-angle waveform to generate a wide-angle adjustment waveform, or to receive the first narrow-angle waveform and the second narrow-angle waveform to generate a narrow-angle adjustment waveform.

2. The privacy screen drive circuit of claim 1, wherein, The first waveform generation module includes: A first initial waveform generation unit is connected to the angle adjustment signal output terminal to receive the angle adjustment signal and generate a first wide angle initial waveform or a first narrow angle initial waveform. A first amplification unit is connected to the first initial waveform generation unit to amplify the first wide-view initial waveform or the first narrow-view initial waveform. A filtering unit, which is connected to the first amplification unit, filters the amplified first wide-angle initial waveform to generate the first wide-angle waveform, or filters the amplified first narrow-angle initial waveform to generate the first narrow-angle waveform. The filtering unit is connected to the waveform overlay module.

3. The privacy screen drive circuit of claim 2, wherein, The first initial waveform generation unit includes a microcontroller chip; The control terminal of the microcontroller chip is connected to the viewing angle adjustment signal output terminal, and the signal output terminal of the microcontroller chip is connected to the first amplification unit.

4. The privacy screen drive circuit of claim 3, wherein, The first amplification unit includes a first resistor, a second resistor, a third resistor, and a first amplifier; The signal output terminal of the microcontroller chip is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the positive input terminal of the first amplifier, the first terminal of the second resistor is grounded, the second terminal of the second resistor and the negative input terminal of the first amplifier are both connected to the first terminal of the third resistor, and the second terminal of the third resistor and the filter unit are both connected to the output terminal of the first amplifier.

5. The privacy screen drive circuit of claim 4, wherein, The filtering unit includes a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor; The first end of the fourth resistor is connected to the output end of the first amplifier. The second end of the fourth resistor and the first end of the first capacitor are both connected to the first end of the fifth resistor. The second end of the fifth resistor and the first end of the second capacitor are both connected to the waveform superposition module. The second end of the first capacitor and the second end of the second capacitor share a common ground.

6. The privacy screen drive circuit of claim 4, wherein, The amplification factor of the first amplifier is the ratio of the resistance value of the third resistor to the resistance value of the second resistor.

7. The privacy screen drive circuit of claim 1, wherein, The second waveform generation module includes: The DC power supply unit outputs the first voltage at its output terminal. A voltage selection unit is connected with an output end of the direct current power supply unit, a control end of the voltage selection unit is connected with the viewing angle adjustment signal output end, and the voltage selection unit is connected with the second amplification unit; the control end of the voltage selection unit receives the viewing angle adjustment signal to output the first voltage to the second amplification unit, or receives the viewing angle adjustment signal to divide the first voltage to generate a second voltage and output the second voltage to the second amplification unit; The second amplification unit amplifies the received first voltage to output the second wide viewing angle waveform, or amplifies the received second voltage to output the second narrow viewing angle waveform; The second amplification unit is connected with the waveform superposition module.

8. The privacy screen drive circuit of claim 7, wherein, The direct current power supply unit comprises a DCDC power supply; The voltage selection unit comprises a sixth resistor, a seventh resistor and a selector; The second amplification unit comprises a second amplifier; An output end of the DCDC power supply and a first end of the sixth resistor are both connected with a first input end of the selector, a second end of the sixth resistor and a first end of the seventh resistor are both connected with a second input end of the selector, a second end of the seventh resistor is grounded, a control end of the selector is connected with the viewing angle adjustment signal output end, an output end of the selector is connected with a positive input end of the second amplifier, and a negative input end and an output end of the second amplifier are both connected with the waveform superposition module.

9. The privacy screen drive circuit of claim 1, wherein, The waveform superposition module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third amplifier; A first end of the eighth resistor is connected with the second waveform generation module, a second end of the eighth resistor and a negative input end of the third amplifier are both connected with a first end of the ninth resistor, a first end of the tenth resistor is connected with the first waveform generation module, a second end of the tenth resistor and a first end of the eleventh resistor are both connected with a positive output end of the third amplifier, a second end of the eleventh resistor is grounded, a second end of the ninth resistor and an output end of the third amplifier are connected.

10. An anti-peep display device, characterized by comprising: The privacy screen driving circuit comprises any one of claims 1-9.

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