A driving circuit and a privacy display device

Abstract

The application provides a driving circuit and a privacy display device. The driving circuit comprises an amplification circuit assembly, an input end of the amplification circuit assembly is used for connecting a single-chip microcomputer, and an output end of the amplification circuit assembly is connected to an equivalent capacitor device of the privacy display device. It can be understood that when the driving circuit operates, the single-chip microcomputer can input square wave signals with the same phase or different phases to the amplification circuit assembly, so as to adjust the visual angle of the privacy display device. In addition, the driving circuit can further comprise a valve pipe assembly, a first input end of the valve pipe assembly is used for connecting a system input power supply, a second input end of the valve pipe assembly is located between the amplification circuit assembly and the equivalent capacitor device, so as to realize conduction of the amplification circuit assembly and the system input power supply, and meanwhile, an output end of the valve pipe assembly is used for grounding.

Description

Technical Field

[0001] The present application relates to the field of display panels, and in particular to a driving circuit and an anti-peeping display device. Background Art

[0002] With technological advancements, the demand for privacy protection in liquid crystal display devices is becoming increasingly stringent. Existing privacy protection screens typically incorporate an additional privacy layer within the LCD. A voltage differential is generated by applying a voltage to the electrodes above and below the privacy layer. This voltage differential causes the liquid crystal within the privacy layer to change its transmittance, thereby altering the viewing angle of the display.

[0003] However, since the anti-peeping layer is usually powered by AVDD (analog circuit power supply), and AVDD (analog circuit power supply) is usually powered on and off later than the system input power supply of the liquid crystal display device, when the system input power supply of the liquid crystal display device is powered on or off, the AVDD (analog circuit power supply) that powers the anti-peeping layer is not powered on or off instantly, but is powered on with a delay when powered on, or when powered off, the anti-peeping layer is powered by the stored power supply when powered on, and the stored power supply will be continuously consumed by the anti-peeping layer. However, this will make the voltage of AVDD (analog circuit power supply) unstable, and thus make the liquid crystal display device insufficiently power the anti-peeping layer, thereby causing the screen to flicker abnormally. Summary of the Invention

[0004] The embodiments of the present application provide a driving circuit and an anti-peeping display device to solve the problem that the AVDD (analog circuit power supply) that powers the anti-peeping layer of the existing liquid crystal display device cannot be quickly powered down at the moment of power-on or power-off, causing abnormal flickering of the screen.

[0005] In a first aspect, embodiments of the present application provide a driving circuit for use in an anti-peeping display device, comprising:

[0006] an amplifier circuit assembly, wherein the input end of the amplifier circuit assembly is used to connect to the single-chip microcomputer, the output end of the amplifier circuit assembly is connected to the equivalent capacitor device of the anti-peeping display device, and the amplifier circuit assembly is used to transmit a square wave signal to the equivalent capacitor device to adjust the viewing angle of the anti-peeping display device;

[0007] A valve tube assembly, wherein the first input end of the valve tube assembly is used to connect to the system input power supply, the second input end of the valve tube assembly is located between the output end of the amplifier circuit assembly and the equivalent capacitor device, and the output end of the valve tube assembly is used to be grounded.

[0008] Optionally, in one embodiment, the driving circuit includes a first resistor, and the first resistor is arranged between the valve tube assembly and the system input power supply.

[0009] Optionally, in one embodiment, the driving circuit further includes a diode, which is arranged in parallel with the first resistor, and the anode of the diode is connected to the first input end of the valve tube assembly, and the cathode of the diode is connected to the output end of the system input power supply.

[0010] Optionally, in one embodiment, the driving circuit further includes a filter circuit, the input end of the filter circuit is connected to the output end of the first resistor, and the output end of the filter circuit is grounded.

[0011] Optionally, in one embodiment, the valve tube assembly includes a first valve tube and a second valve tube arranged in parallel, and the amplifier circuit assembly includes a first amplifier circuit and a second amplifier circuit arranged in parallel, wherein the first output end of the first amplifier circuit and the first output end of the second amplifier circuit are both connected to the equivalent capacitor device of the anti-peeping display device, the second output end of the first amplifier circuit is connected to the first valve tube, and the second output end of the second amplifier circuit is connected to the second valve tube.

[0012] Optionally, in one embodiment, the amplifying circuit component further includes a second resistor and a third resistor, the second resistor being arranged between the first amplifying circuit and the equivalent capacitor device of the anti-peeping display device, and the third resistor being arranged between the second amplifying circuit and the equivalent capacitor device of the anti-peeping display device.

[0013] Optionally, in one embodiment, the first amplifier circuit and the second amplifier circuit are both inverting proportional operational amplifier circuits.

[0014] Optionally, in one embodiment, both the first valve tube and the second valve tube are PMOS tubes.

[0015] Optionally, in one embodiment, the single chip microcomputer includes at least two voltage input terminals, and the at least two voltage input terminals are respectively connected to the first amplifying circuit and the second amplifying circuit.

[0016] In a second aspect, an embodiment of the present application further provides an anti-peeping display device, comprising an anti-peeping component and a display panel, wherein the anti-peeping component comprises a driving circuit as described above, wherein the driving circuit is used to drive the anti-peeping component to operate, and the anti-peeping component is arranged on the light-emitting side of the display panel.

[0017] The driving circuit provided in an embodiment of the present application is applied to an anti-peeping display device. The driving circuit includes an amplifier circuit component, wherein the input end of the amplifier circuit component is connected to a single-chip microcomputer, and the output end of the amplifier circuit component is connected to an equivalent capacitor device of the anti-peeping display device. It is understood that when the driving circuit is in operation, the single-chip microcomputer can input square wave signals with the same or different phases to the amplifier circuit component to adjust the viewing angle of the anti-peeping display device, thereby realizing the anti-peeping function of the anti-peeping display device.

[0018] In addition, the driving circuit may also include a valve tube assembly, wherein the first input end of the valve tube assembly is used to connect to the system input power supply, and the second input end of the valve tube assembly is located between the amplifier circuit assembly and the equivalent capacitor device to achieve conduction between the amplifier circuit assembly and the system input power supply, while at the same time, the output end of the valve tube assembly is used to be grounded. At the moment when the system input power supply is powered on or off, a voltage difference reaching the conduction threshold of the valve tube assembly can be formed between the first input end of the valve tube assembly (i.e., the voltage of the amplifier circuit assembly) and the second input end (i.e., the voltage of the system input power supply), so that the valve tube assembly is turned on. After the valve tube assembly is turned on, the voltage of the amplifier circuit assembly can be grounded along the output end of the valve tube assembly, thereby achieving rapid power-off of AVDD (analog circuit power supply) that supplies power to the anti-peeping layer, thereby avoiding the problem of abnormal flickering of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the driving circuit provided in an embodiment of the present application.

[0021] Figure 2 for Figure 1 The shown structure is a schematic diagram of the driving circuit after being split into a first amplifying circuit and a second amplifying circuit.

[0022] Figure 3 This is a structural diagram of the anti-peeping display device provided in an embodiment of the present application in the Privacy mode (i.e., anti-peeping mode).

[0023] Figure 4 This is a structural diagram of the anti-peeping display device provided in an embodiment of the present application in Sharing mode (i.e., sharing mode).

[0024] Figure 5 Schematic diagram of square wave signal output of the anti-peeping display device provided in an embodiment of the present application in Privacy mode (i.e., anti-peeping mode).

[0025] Figure 6 This is a schematic diagram of the square wave signal output of the anti-peeping display device provided in an embodiment of the present application in the Sharing mode (i.e., sharing mode).

[0026] Reference numerals:

[0027] 100. Driving circuit; 110. Amplifying circuit assembly; 111. First amplifying circuit; 112. Second amplifying circuit; 113. Second circuit; 114. Third resistor; 120. Valve tube assembly; 121. First valve tube; 122. Second valve tube; 123. First resistor; 124. Diode; 125. Filter circuit; 130. Equivalent capacitor device; 140. Analog circuit power supply signal; 200. Single-chip microcomputer; 300. System input power supply; 400. Anti-peeping assembly; 500. Display panel. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0029] With technological advancements, the demand for privacy protection in liquid crystal display devices is becoming increasingly stringent. Existing privacy protection screens typically incorporate an additional privacy layer within the LCD. A voltage differential is generated by applying a voltage to the electrodes above and below the privacy layer. This voltage differential causes the liquid crystal within the privacy layer to change its transmittance, thereby altering the viewing angle of the display.

[0030] However, since the anti-peeping layer is usually powered by AVDD (analog circuit power supply), and AVDD (analog circuit power supply) is usually powered on and off later than the system input power supply of the liquid crystal display device, when the system input power supply of the liquid crystal display device is powered on or off, the AVDD (analog circuit power supply) that powers the anti-peeping layer is not powered on or off instantly, but is powered on with a delay when powered on, or when powered off, the anti-peeping layer is powered by the stored power supply when powered on, and the stored power supply will be continuously consumed by the anti-peeping layer. However, this will make the voltage of AVDD (analog circuit power supply) unstable, and thus make the liquid crystal display device insufficiently power the anti-peeping layer, thereby causing the screen to flicker abnormally.

[0031] Based on the above technical problems, the present application embodiment provides a driving circuit, please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the driving circuit provided in an embodiment of the present application.

[0032] like Figure 1 As shown, in this embodiment, the driving circuit 100 includes an amplifier circuit assembly 110, wherein the input end of the amplifier circuit assembly 110 is used to connect to the single-chip microcomputer 200, and the output end of the amplifier circuit assembly 110 is connected to the equivalent capacitor device 130 of the anti-peeping display device. It will be understood that when the driving circuit 100 is operating, the single-chip microcomputer 200 can input square wave signals with the same or different phases to the amplifier circuit assembly 110 to adjust the viewing angle of the anti-peeping display device, thereby realizing the anti-peeping function of the anti-peeping display device.

[0033] Also, please continue reading Figure 1 In this embodiment, the driver circuit 100 may further include a valve pipe assembly 120. A first input terminal of the valve pipe assembly 120 is connected to the system input power supply 300. A second input terminal of the valve pipe assembly 120 is located between the amplifier circuit assembly 110 and the equivalent capacitor device 130 to achieve electrical continuity between the amplifier circuit assembly 110 and the system input power supply 300. Meanwhile, an output terminal of the valve pipe assembly 120 is grounded. When the system input power supply 300 is powered on or off, a voltage difference reaching a conduction threshold of the valve pipe assembly 120 is generated between the first input terminal (i.e., the voltage of the amplifier circuit assembly 110) and the second input terminal (i.e., the voltage of the system input power supply 300), thereby causing the valve pipe assembly 120 to conduct. Once the valve pipe assembly 120 is conducting, the voltage of the amplifier circuit assembly 110 is connected to ground along the output terminal of the valve pipe assembly 120, thereby rapidly powering down the AVDD (analog circuit power supply) that powers the privacy protection layer, thereby preventing abnormal screen flickering.

[0034] It should be noted that in other embodiments of the present application, the following can be used: Figure 1 The analog circuit power signal 140 shown is used to power the amplifier circuit component 110 . It is understood that the power-on and power-off times of the analog circuit power signal 140 are both later than the system input power 300 .

[0035] In this embodiment, the valve tube assembly 120 conduction threshold can be -0.5V. That is, when the voltage difference between the first input terminal (i.e., the voltage of the amplifier circuit assembly 110) and the second input terminal (i.e., the voltage of the system input power supply 300) of the valve tube assembly 120 is less than -0.5V, the valve tube assembly 120 conducts, achieving the purpose of quickly powering down the AVDD (analog circuit power supply) that powers the privacy layer. It will be understood that the conduction threshold of the valve tube assembly 120 in this embodiment can be adjusted according to different types of valve tubes and the voltage or resistance values ​​of various components in the driver circuit 100.

[0036] Optional, such as Figure 1As shown, in one embodiment, the driving circuit 100 may include a first resistor 123, which is arranged between the valve tube assembly 120 and the system input power supply 300 to achieve a delay effect on the system input power supply 300, so that a pressure difference can be formed at both ends of the valve tube assembly 120 as soon as possible, and the conduction of the valve tube assembly 120 is accelerated, thereby achieving rapid power-off of AVDD (analog circuit power supply) that supplies power to the anti-peep layer, thereby avoiding the problem of abnormal flickering of the screen.

[0037] In the meantime, please continue to read Figure 1 The driving circuit 100 may further include a diode 124, which is arranged in parallel with the first resistor 123, and the anode of the diode 124 is connected to the first input end of the valve tube assembly 120, and the cathode of the diode 124 is connected to the output end of the system input power supply 300.

[0038] It can be understood that because the cathode of diode 124 is connected to the system input power supply 300, when the driver circuit 100 is operating normally (i.e., when the system input power supply 300 is supplying power to the valve tube assembly 120, the light-emitting power supply, and the amplifier circuit assembly 110), the voltage generated by the system input power supply 300 does not enter the diode 124. In other words, when the driver circuit 100 is operating normally, the diode 124 does not achieve a voltage dividing effect, thereby ensuring the normal operation of the driver circuit 100. However, if the system input power supply 300 is suddenly cut off, the voltage remaining at the moment of the system input power supply 300 cut off can enter the diode 124 along the direction from the anode to the cathode of the diode 124, thereby accelerating the discharge efficiency of the system input power supply 300 and thus accelerating the conduction of the valve tube assembly 120.

[0039] At the same time, if Figure 1 As shown, the driving circuit 100 may further include a filtering circuit 125, the input end of the filtering circuit 125 being connected to the output end of the first resistor 123 to achieve a delay effect on the system input power 300, so that a pressure difference can be formed at both ends of the valve tube assembly 120 as quickly as possible, and the conduction of the valve tube assembly 120 is accelerated, thereby achieving rapid power-off of AVDD (analog circuit power supply) that supplies power to the anti-peep layer, thereby avoiding the problem of abnormal flickering of the screen.

[0040] Optional, please combine Figure 2 , Figure 2 for Figure 1 The driving circuit 100 shown is a schematic structural diagram after being split into a first amplifying circuit 111 and a second amplifying circuit 112 .

[0041] like Figure 2As shown, in one embodiment, the valve tube assembly 120 may include a first valve tube 121 and a second valve tube 122 arranged in parallel, and the amplifier circuit assembly 110 may include a first amplifier circuit 111 and a second amplifier circuit 112 arranged in parallel. Among them, the first output end of the first amplifier circuit 111 and the first output end of the second amplifier circuit 112 are both connected to the equivalent capacitor device 130 of the anti-peeping display device, so that the single-chip microcomputer 200 can input square wave signals with the same or different phases to the first amplifier circuit 111 and the second amplifier circuit 112 to adjust the viewing angle of the anti-peeping display device to achieve the anti-peeping function of the anti-peeping display device; at the same time, the second output end of the first amplifier circuit 111 is connected to the first valve tube 121, and the second output end of the second amplifier circuit 112 is connected to the second valve tube 122, so that by setting the first valve tube 121 to correspond to the first amplifier circuit 111 and setting the second valve tube 122 to correspond to the second amplifier circuit 112, the first amplifier circuit 111 and the second amplifier circuit 112 can be independently turned on, further improving the precise elimination effect of the residual voltage in the driving circuit 100.

[0042] It can be understood that in this embodiment, the first valve tube 121 and the second valve tube 122 can be PMOS tubes (Positive Channel Metal Oxide Semiconductor), so as to achieve more accurate conduction judgment of the driving circuit 100; among them, the types of the first valve tube 121 and the second valve tube 122 (i.e., the conduction threshold) can be adjusted according to actual conditions.

[0043] Optional, such as Figure 2 As shown, in this embodiment, the amplifying circuit component 110 may include a second circuit and a third resistor 114, the second resistor 113 is arranged between the first amplifying circuit 111 and the equivalent capacitor device 130 of the anti-peeping display device, and the third resistor 114 is arranged between the second amplifying circuit 112 and the equivalent capacitor device 130 of the anti-peeping display device, thereby providing sufficient phase margin to prevent circuit oscillation.

[0044] Meanwhile, in this embodiment, the first amplifier circuit 111 and the second amplifier circuit 112 can be as follows: Figure 2 As shown, the inverting proportional operational amplifier circuit is composed of an operational amplifier and multiple resistors, which can not only return part of the output signal to the input end to ensure the accuracy of signal transmission, but also achieve a more precise control effect on the control circuit.

[0045] It should be noted that in this embodiment, the single chip microcomputer 200 inputs square wave signals with the same or different phases to the amplifier circuit component 110 to adjust the viewing angle of the anti-peeping display device to achieve the anti-peeping function of the anti-peeping display device. Figure 2 Also see Figure 3-Figure 6 , Figure 3 This is a structural diagram of the anti-peeping display device provided in an embodiment of the present application in the privacy mode (i.e., anti-peeping mode), Figure 4 This is a structural diagram of the anti-peeping display device provided in an embodiment of the present application in Sharing mode (i.e., sharing mode). Figure 5 This is a schematic diagram of the square wave signal output of the anti-peeping display device provided in the embodiment of the present application in the privacy mode (i.e., anti-peeping mode), Figure 6 This is a schematic diagram of the square wave signal output of the anti-peeping display device provided in an embodiment of the present application in the Sharing mode (i.e., sharing mode).

[0046] like Figure 2 、 Figure 3 and Figure 5 As shown, the backlight source can pass through the display panel 500 and the anti-peeping component 400 is arranged on the light-emitting side of the display panel 500. When the anti-peeping display device is in the anti-peeping mode, the single-chip microcomputer 200 outputs square wave signals with the same amplitude and a phase difference of 180° to the first amplifier circuit 111 and the second amplifier circuit 112 respectively. After the first amplifier circuit 111 and the second amplifier circuit 112 amplify the signals, the first amplifier circuit 111 and the second amplifier circuit 112 can form the following Figure 5 The symmetrical square wave signal passing through 0V shown in the figure has an amplitude of twice the voltage in the first amplifier circuit 111 or twice the voltage in the second amplifier circuit 112. At this time, by adjusting the ratio of the resistors in the first amplifier circuit 111 or the second amplifier circuit 112, the target driving voltage can be obtained, thereby driving the liquid crystal to flip to the target angle to achieve the anti-peeping effect of the anti-peeping display device (that is, Figure 3 Narrow viewing angle shown).

[0047] When the anti-peeping display device is in the Figure 4 and Figure 6 In the shared mode shown, the square wave signals output by the microcontroller 200 to the first amplifier circuit 111 and the second amplifier circuit 112 have the same amplitude and phase, that is, the voltage within the first amplifier circuit 111 and the voltage within the second amplifier circuit 112 have the same value. Since the first amplifier circuit 111 and the second amplifier circuit are arranged in parallel, the voltage value at the equivalent capacitor device 130 is close to 0 at this time. Therefore, there is no driving voltage in the driving circuit 100 to drive the liquid crystal to flip, thereby achieving a wide viewing angle effect of the anti-peeping display device.

[0048] It should be noted that the control circuit in this embodiment can realize the anti-peeping or sharing function of the anti-peeping display device by using only two operational amplifiers, which can save manufacturing costs compared to the prior art which usually requires multiple operational amplifiers.

[0049] It is understood that in other embodiments of the present application, the single chip microcomputer 200 may also include the following Figure 2 At least two voltage input terminals are shown, and at least two voltage input terminals are respectively connected to the first amplifier circuit 111 and the second amplifier circuit 112, so that when the microcontroller 200 inputs a square wave signal to the first amplifier circuit 111 and the second amplifier circuit 112, it can be ensured that the square wave signals input into the two amplifier circuits will not interfere with each other.

[0050] like Figure 3 or Figure 4 As shown, an embodiment of the present application further provides an anti-peeping display device, comprising an anti-peeping component 400 and a display panel 500. The anti-peeping component 400 comprises any of the above-mentioned driving circuits 100, the driving circuit 100 being used to drive the anti-peeping component 400 to operate, the backlight source being able to pass through the display panel 500, and the anti-peeping component 400 being disposed on the light-emitting side of the display panel 500. The device comprises the driving circuit 100 mentioned in any of the above-mentioned embodiments.

[0051] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0053] The driving circuit and anti-peeping display device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A driving circuit, applied to an anti-peeping display device, characterized in that: include: an amplifier circuit assembly, wherein the input end of the amplifier circuit assembly is used to connect to the single-chip microcomputer, the output end of the amplifier circuit assembly is connected to the equivalent capacitor device of the anti-peeping display device, and the amplifier circuit assembly is used to transmit a square wave signal to the equivalent capacitor device to adjust the viewing angle of the anti-peeping display device; A valve tube assembly, wherein the first input end of the valve tube assembly is used to connect to the system input power supply, the second input end of the valve tube assembly is located between the output end of the amplifier circuit assembly and the equivalent capacitor device, and the output end of the valve tube assembly is used to be grounded.

2. The driving circuit according to claim 1, wherein: The driving circuit includes a first resistor, which is arranged between the valve tube assembly and the system input power supply.

3. The driving circuit according to claim 2, wherein: The driving circuit further includes a diode, which is arranged in parallel with the first resistor, and the anode of the diode is connected to the first input end of the valve tube assembly, and the cathode of the diode is connected to the output end of the system input power supply.

4. The driving circuit according to claim 2, wherein: The driving circuit further includes a filter circuit, wherein an input end of the filter circuit is connected to an output end of the first resistor, and an output end of the filter circuit is grounded.

5. The driving circuit according to claim 1, wherein: The valve tube assembly includes a first valve tube and a second valve tube arranged in parallel, and the amplifier circuit assembly includes a first amplifier circuit and a second amplifier circuit arranged in parallel, wherein the first output end of the first amplifier circuit and the first output end of the second amplifier circuit are both connected to the equivalent capacitor device of the anti-peeping display device, the second output end of the first amplifier circuit is connected to the first valve tube, and the second output end of the second amplifier circuit is connected to the second valve tube.

6. The driving circuit according to claim 5, wherein: The amplifying circuit component further includes a second resistor and a third resistor, wherein the second resistor is arranged between the first amplifying circuit and the equivalent capacitor component of the anti-peeping display device, and the third resistor is arranged between the second amplifying circuit and the equivalent capacitor component of the anti-peeping display device.

7. The driving circuit according to claim 5, wherein: The first amplifier circuit and the second amplifier circuit are both inverting proportional operational amplifier circuits.

8. The driving circuit according to claim 5, wherein: The first valve tube and the second valve tube are both PMOS tubes.

9. The driving circuit according to claim 5, wherein: The single chip microcomputer includes at least two voltage input terminals, and the at least two voltage input terminals are respectively connected to the first amplifying circuit and the second amplifying circuit.

10. An anti-peeping display device, characterized in that: The device comprises an anti-peeping component and a display panel, wherein the anti-peeping component comprises a driving circuit as described in any one of claims 1 to 9, wherein the driving circuit is used to drive the anti-peeping component to operate, and the anti-peeping component is arranged on the light-emitting side of the display panel.

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