Driving circuit, chip and display device

Abstract

The utility model discloses a driving circuit, a chip and a display device. The driving circuit comprises a control unit for receiving a preset parameter and providing a control signal; the digital-to-analog conversion unit is in communication connection with the control unit, receives the control signal and outputs at least one group of corresponding analog signals, each group of analog signals comprises at least two identical alternative waveforms, and the alternative waveforms of each group of analog signals are different from each other; and the selection unit is in communication connection with the digital-to-analog conversion unit, receives the corresponding selection signal and selects the corresponding alternative waveform from each group of analog signals as the output waveform of the group of analog signals. Therefore, the normal output of the driving signal can be realized under the condition that at least one path of alternative waveform is correct, the stability of the system is improved, and the complex operation of jumping wires and externally connecting a digital-to-analog converter when a certain path of alternative waveform is abnormal is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, and in particular to a driving circuit, a chip and a display device. Background Art

[0002] DAC (Digital-to-Analog Converter) is an electronic device that converts digital signals (discrete values) into analog signals (continuous values). It is usually used as one of the components of the driving circuit and is widely used in many fields such as audio processing, video display and communication systems. Taking the display device as an example, DAC is used in PDLC (Polymer Dispersed Liquid Crystal) circuits and cholesteric liquid crystal circuits to provide driving voltage waveforms of different amplitudes to make the liquid crystal flip differently, thereby realizing the anti-peeping function.

[0003] Figure 1 A schematic structural diagram of a driving circuit in the prior art is shown. Figure 1 The driving circuit includes a control unit 111, a digital-to-analog conversion unit 112, and a computing unit 113. The control unit 111 is used to provide a control signal to control the digital-to-analog conversion unit 112 to provide a corresponding output waveform, and the output waveform is amplified by the computing unit 113 to obtain a driving signal within a preset range.

[0004] However, since the digital-to-analog conversion unit 112 only provides one output waveform, when the waveform output is abnormal (for example, the output port is damaged), the subsequent operation unit 113 cannot be used any more and is forced to be scrapped, which is very detrimental to the stability of the driving circuit operation. Utility Model Content

[0005] In view of the above problems, the purpose of the present application is to provide a driving circuit, a chip and a display device, which provide multiple alternative waveforms for each output waveform, thereby improving the operating stability of the driving circuit.

[0006] According to one aspect of the present application, a driving circuit is provided, characterized in that it includes: a control unit, which receives preset parameters and provides a control signal; a digital-to-analog conversion unit, which is communicatively connected to the control unit, receives the control signal and outputs at least one corresponding group of analog signals, each group of the analog signals includes at least two identical alternative waveforms, and the alternative waveforms of each group of the analog signals are different from each other; and a selection unit, which is communicatively connected to the digital-to-analog conversion unit, receives a corresponding selection signal and selects the corresponding alternative waveform in each group of the analog signals as the output waveform of the group of the analog signals.

[0007] Optionally, the driving circuit further includes: a detection unit, which is communicatively connected with the digital-to-analog conversion unit and the selection unit, receives each group of the analog signals and provides the corresponding selection signal according to the detection result.

[0008] Optionally, the detection unit includes: an analog-to-digital converter, which converts the alternative waveforms of each group of the analog signals into corresponding digital signals; a comparator, which provides a comparison result between the digital signal and the corresponding control signal; and an output module, which receives the comparison result and provides the corresponding selection signal.

[0009] Optionally, the detection unit includes a development board or a micro control unit.

[0010] Optionally, the driving circuit further includes an operation circuit, which is communicatively connected with the selection unit and receives and processes each of the output waveforms to obtain a driving signal within a preset range.

[0011] Optionally, the operational circuit includes an amplifier circuit or a follower circuit.

[0012] Optionally, the selection circuit includes an enabling switch or a multiplexer.

[0013] According to another aspect of the present application, a chip is provided, characterized in that it includes the driving circuit as described in any one of the above items.

[0014] According to the third aspect of the present application, a display device is provided, characterized in that it includes: a display panel, the display panel includes anti-peeping electrodes arranged according to a preset rule, the anti-peeping electrodes are electrically connected to the liquid crystal layer of the display panel to receive an anti-peeping signal and adjust the flip angle of the corresponding liquid crystal molecules; and an anti-peeping electrode driving circuit, including the driving circuit as any of the above items to provide the anti-peeping signal.

[0015] According to the driving circuit, chip and display device provided by the present application, for each output waveform, the digital-to-analog conversion unit provides at least two alternative waveforms, so that the normal output of the driving signal can be achieved when at least one alternative waveform is correct, thereby improving the stability of the system and avoiding the complicated operation of jumper wires and external digital-to-analog converters when a certain alternative waveform is abnormal. At the same time, the output of multiple alternative waveforms also improves the utilization rate of the output port of the digital-to-analog conversion unit and reduces resource waste.

[0016] Furthermore, a detection unit is provided to control a selection unit to select a correct waveform as a corresponding output waveform for each group of analog signals according to the detection results of each candidate waveform, thereby avoiding the influence of abnormalities of the analog-to-digital conversion unit on downstream devices and improving the reliability of the driving signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic structural diagram of a prior art driving circuit is shown;

[0019] Figure 2 A schematic structural diagram of a driving circuit according to an embodiment of the present application is shown;

[0020] Figure 3 Show Figure 2 A schematic structural diagram of the selection unit shown;

[0021] Figure 4 A schematic structural diagram of a display device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0023] At the same time, certain words are used in this patent specification and claims to refer to specific components. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same component. This patent specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction.

[0024] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by programmable circuits. When an element or circuit is said to be "connected to" another element or an element or circuit is said to be "connected between" two nodes, it may be directly coupled or connected to another element or there may be an intermediate element, and the connection between the elements may be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0025] In addition, it should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0026] Figure 2 FIG. 2 shows a schematic structural diagram of a driving circuit according to an embodiment of the present application. Figure 2 As shown, the driving circuit 200 of the embodiment of the present application includes a control unit 210 , a digital-to-analog conversion unit 220 , a selection unit 230 , a detection unit 240 and a calculation unit 250 .

[0027] The control unit 210 receives preset parameters and outputs control signals. During the debugging process, the control unit 210 can be implemented as a development board; during mass production, the control unit 210 can be implemented as an MCU (Micro Controller Unit), such as a single-chip microcomputer, etc., which is not limited in this application.

[0028] The digital-to-analog conversion unit 220 is connected to the control unit 210 for communication, receives the control signal and outputs at least one group of analog signals according to the control signal, each group of analog signals includes at least two identical alternative waveforms, and the alternative waveforms of each group of analog signals are different from each other. Figure 2 In the figure, two groups of analog signals are shown as examples. The first group of analog signals includes two identical candidate waveforms An1 and An2; the second group of analog signals includes two identical candidate waveforms An3 and An4, and each candidate waveform in the first analog signal is different from each candidate waveform in the second group of analog signals.

[0029] The selection unit 230 is in communication with the digital-to-analog conversion unit 220, receives each group of analog signals, and is configured to select a corresponding candidate waveform from each group of analog signals as an output waveform of the group of analog signals according to the selection signal.

[0030] The selection unit 230 includes, for example, an enable switch or a multiplexer corresponding to each group of analog signals. Figure 3 Shows Figure 2 The schematic structural diagram of the selection unit 230 is shown in FIG. Figure 3In the example, two groups of analog signals are still used. The first group of analog signals includes two identical candidate waveforms An1 and An2; the second group of analog signals includes two identical candidate waveforms An3 and An4. And in Figure 3 In the example, the selection unit 230 includes a first enabling switch KW1 corresponding to the first group of analog signals and a second enabling switch KW2 corresponding to the second group of analog signals. Each enabling switch is controlled by a selection signal to select a corresponding alternative waveform in the group of analog signals as the output waveform of the group of analog signals. Figure 3 In the embodiment, the candidate waveform An1 is selected as the first output waveform OW1 corresponding to the first group of analog signals, and the candidate waveform An3 is selected as the second output waveform corresponding to the second group of analog signals.

[0031] In some embodiments, the selection signal is provided artificially, for example, through an external circuit or a host computer; in the embodiment of the present application, the selection signal is provided by the detection unit 240.

[0032] The detection unit 240 is connected in communication with the digital-to-analog conversion unit 220 and the selection unit 230, receives and detects each group of analog signals, and provides a corresponding selection signal according to the detection result. The detection unit 240 is configured to provide, for each group of analog signals, a selection signal corresponding to selecting any correct alternative waveform of the group of analog signals when there is at least one correct alternative waveform in the group of analog signals; and to provide a reset signal of the selection signal to stop selecting the corresponding alternative waveform in the group of analog signals when all the alternative waveforms in the group of analog signals are abnormal.

[0033] Still Figure 2 and Figure 3 Taking the two groups of analog signals shown as examples, for the first group of analog signals, when the detection unit 240 determines that both the candidate waveforms An1 and An2 are abnormal, a selection signal is provided to control the selection unit 230 to stop outputting the first output waveform OW1; when the detection unit 240 determines that one of the candidate waveforms An1 and An2 is correct and the other is abnormal, a corresponding selection signal is provided to control the selection unit 230 to select the correct alternative waveform as the first output waveform OW1; when the detection unit 240 determines that both the candidate waveforms An1 and An2 are correct, a corresponding selection signal is provided to control the selection unit 230 to select any one of An1 and An2 as the first output waveform OW1. For the second group of analog signals, the selection principle is the same and will not be repeated here.

[0034] It should be noted that, in some embodiments, the detection unit 240 is implemented by a corresponding circuit structure, for example, including an analog-to-digital converter (ADC), a comparator and an output module. The detection unit 240 receives each group of analog signals and converts them into corresponding digital signals through the analog-to-digital converter and sends them to the comparator for comparison with the control signal provided by the control unit, thereby obtaining a comparison result representing whether each candidate waveform is correct; the output module outputs a corresponding selection signal according to the comparison result. In some other embodiments, the detection unit 240 can be implemented as a development board in the test phase; in mass production, the detection unit 240 can be implemented as an MCU (Micro Controller Unit), such as a single-chip microcomputer, so as to obtain the detection results of each waveform in each group of analog signals through any code that can realize analog-to-digital conversion and comparison functions in the prior art. And in some embodiments, in order to save costs, the control unit 210 and the detection unit 240 share the same development board or MCU.

[0035] Further, in some embodiments, since the analog signal provided by the digital-to-analog conversion unit 220 cannot meet the requirements of the amplitude, peak value, etc. of the driving signal, the driving circuit 200 further includes an operation unit 250. The operation unit 250 is connected to the selection unit 230 for communication, and receives and processes each output waveform to obtain a driving signal within a preset range. The operation unit 250 includes, for example, an amplifier circuit, a follower circuit, and other circuit structures, which are not limited in the present application.

[0036] The following is a brief description of the working process of the driving circuit 200 provided by the present application: the control unit 210 provides a control signal to the digital-to-analog conversion unit 220 according to the preset configuration parameters. The digital-to-analog conversion unit 220 outputs at least one group of analog signals according to the received control signal, each group of analog signals includes at least two identical alternative waveforms, and the alternative waveforms of each group of analog signals are different. The detection unit 240 converts the corresponding alternative waveforms of each group of analog signals output by the digital-to-analog conversion unit 220 into digital signals through analog-to-digital conversion and compares them with the control signal, so as to determine whether each alternative waveform is correct and provide a corresponding selection signal to the selection unit 230 according to the judgment result. Among them, the detection unit 240 is configured to, for each group of analog signals, when there is at least one correct alternative waveform in the group of analog signals, provide a selection signal corresponding to selecting any correct alternative waveform of the group of analog signals; and when each waveform of the group of analog signals is abnormal, provide a selection signal corresponding to stopping the selection of the output waveform in the alternative waveform of the group of analog signals. Then, the selection unit 230 selects the corresponding candidate waveform from each group of analog signals as the output waveform corresponding to the group of analog signals or stops outputting the output waveform corresponding to the group of analog signals according to the received selection signal. Finally, the operation circuit 250 operates each output waveform to obtain a corresponding driving signal within a preset range.

[0037] According to the driving circuit provided by the present application, for each output waveform, the digital-to-analog conversion unit provides at least two alternative waveforms, so that the normal output of the driving signal can be achieved when at least one alternative waveform is correct, thereby improving the stability of the system and avoiding the complicated operation of jumper wires and external digital-to-analog converters when a certain alternative waveform is abnormal. At the same time, the output of multiple alternative waveforms also improves the utilization rate of the output port of the digital-to-analog conversion unit and reduces resource waste.

[0038] Furthermore, a detection unit is provided to control a selection unit to select a correct waveform as a corresponding output waveform for each group of analog signals according to the detection results of each candidate waveform, thereby avoiding the influence of abnormalities of the analog-to-digital conversion unit on downstream devices and improving the reliability of the driving signal.

[0039] Furthermore, as an application example of the driving circuit of the present application in the field of display technology, the present application also provides a display device that can perform anti-peeping display. Figure 4 Schematic diagram of the structure of the display device 300 is shown. Figure 4As shown, the display device 300 includes a display panel 310, an anti-peeping driving circuit 320, a gate driving circuit 330, and a data driving circuit 340. Among them, the anti-peeping driving circuit 320, for example, includes the driving circuit 200 provided in the embodiment of the present application to provide a driving signal as an anti-peeping signal. It should be noted that in the following, the liquid crystal display panel is used as an example for description, but it should be understood that the present application should not be limited to this.

[0040] The display panel 310 includes pixel units arranged in an array, a plurality of data lines DL, and a plurality of scan lines GL. Furthermore, each pixel includes a plurality of pixels 311. Figure 4 In the figure, for example, only one pixel 311, one data line DL and one scan line GL are shown.

[0041] like Figure 4 As shown, a plurality of data lines DL are arranged in parallel along a first direction (x direction in the figure) and extend along a second direction (y direction in the figure); a plurality of scan lines GL are arranged in parallel along the second direction and extend along the first direction. The first direction may be optionally perpendicular to the second direction. In this case, the first direction is the row direction and the second direction is the column direction. The display panel 310 is connected to the data driving circuit 340 through a plurality of data lines DL and is connected to the gate driving circuit 330 through a plurality of scan lines GL. Specifically, the data driving circuit 340 includes a plurality of data channels and the gate driving circuit 330 includes a plurality of scan channels. Each data line DL is connected to a data channel of the data driving circuit 340 and a column of pixels, and each scan line GL is connected to a scan channel of the gate driving circuit 330 and a row of pixels, so that each pixel is connected to the data driver 340 through the corresponding data line DL and is connected to the gate driver 330 through the corresponding scan line GL.

[0042] For a liquid crystal display panel, the display panel 310 also includes a liquid crystal layer. When displaying, each pixel is turned on in sequence according to the scanning voltage VG provided by the gate driver 330, and the liquid crystal molecules corresponding to the pixel are controlled to deflect according to the corresponding data voltage VD, thereby displaying an image.

[0043] Furthermore, in the embodiment of the present application, the display panel 310 further includes an anti-peeping electrode 312 (in Figure 4 In the figure, as an example, only one anti-peeping electrode 312 is shown. The display panel in the area corresponding to each anti-peeping electrode 312 includes, for example, a plurality of pixels. During display, the anti-peeping electrode 312 receives the anti-peeping signal provided by the anti-peeping driving circuit via the corresponding signal line, and applies the anti-peeping signal to the liquid crystal layer, thereby changing the deflection angle of the liquid crystal molecules in the area corresponding to the anti-peeping electrode, so as to reduce the visual viewing angle of the display panel and realize the anti-peeping display of the display panel.

[0044] Since the anti-peeping driving circuit 320 includes the driving circuit of the embodiment of the present application to provide the anti-peeping signal, it also includes any of the above beneficial effects, which will not be repeated here.

[0045] It should be noted that although the above only illustrates the application of the driving circuit provided by the present application in the anti-peep driving circuit by way of example, it should be understood that the present application should not be limited thereto. For example, the driving circuit provided by the present application can also be used to provide a common electrode voltage in a display device. Also, the driving circuit provided by the present application can also be applied to other technical fields such as communications and audio processing.

[0046] Furthermore, the present application also provides a chip, including the driving circuit as described above, and thus also including the beneficial effects of any of the above items, which will not be repeated here.

[0047] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the present invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can make good use of the present invention and the modified use based on the present invention. The scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A driving circuit, characterized in that: include: A control unit receives preset parameters and provides control signals; a digital-to-analog conversion unit, connected in communication with the control unit, receiving the control signal and outputting at least one corresponding group of analog signals, each group of the analog signals comprising at least two identical candidate waveforms, and the candidate waveforms of the analog signals of each group are different from each other; as well as The selection unit is connected to the digital-to-analog conversion unit for receiving a corresponding selection signal and selecting a corresponding candidate waveform in each group of analog signals as an output waveform of the group of analog signals.

2. The driving circuit according to claim 1, characterized in that: The driving circuit further includes: The detection unit is connected to the digital-to-analog conversion unit and the selection unit for receiving each group of the analog signals and providing the corresponding selection signal according to the detection result.

3. The driving circuit according to claim 2, characterized in that: The detection unit comprises: an analog-to-digital converter, converting the candidate waveforms of each group of the analog signals into corresponding digital signals; a comparator, providing a comparison result between the digital signal and the corresponding control signal; and The output module receives the comparison result and provides the corresponding selection signal.

4. The driving circuit according to claim 2, characterized in that: The detection unit includes a development board or a micro control unit.

5. The driving circuit according to claim 1, characterized in that: The driving circuit also includes an operation circuit, which is in communication with the selection unit and receives and processes each of the output waveforms to obtain a driving signal within a preset range.

6. The driving circuit according to claim 5, characterized in that: The operational circuit includes an amplifier circuit or a follower circuit.

7. The driving circuit according to claim 1, characterized in that: The selection unit includes an enabling switch or a multiplexer.

8. A chip, characterized in that: The driving circuit comprises the driving circuit as claimed in any one of claims 1 to 7.

9. A display device, characterized in that: include: A display panel, the display panel comprising anti-peeping electrodes arranged according to a preset rule, the anti-peeping electrodes being electrically connected to a liquid crystal layer of the display panel to receive an anti-peeping signal and adjust a flip angle of corresponding liquid crystal molecules; as well as An anti-peeping electrode driving circuit comprises the driving circuit as claimed in any one of claims 1 to 7 to provide the anti-peeping signal.

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