CN110675796A - Wide-narrow viewing angle switching circuit, display device and viewing angle control method - Google Patents
Wide-narrow viewing angle switching circuit, display device and viewing angle control method Download PDFInfo
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- CN110675796A CN110675796A CN201910913110.XA CN201910913110A CN110675796A CN 110675796 A CN110675796 A CN 110675796A CN 201910913110 A CN201910913110 A CN 201910913110A CN 110675796 A CN110675796 A CN 110675796A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
Abstract
The embodiment of the invention discloses a wide and narrow visual angle switching circuit, a display device and a visual angle control method. The wide and narrow visual angle switching circuit comprises an input end, a first switching circuit and a second switching circuit, wherein the input end is used for receiving a first voltage signal; the output end is used for outputting a common voltage signal, and the control module is used for generating a selection signal according to the mode switching signal; a mode selection module for providing a first path and a second path and gating one of the first path and the second path according to a selection signal; the operation module is connected with the output end, when the first path is gated, the input end is connected with the output end through the first path, and the output end outputs the first voltage signal as a common voltage signal; when the second path is gated, the operation module receives the power supply voltage through the second path, generates a common voltage signal according to the first voltage signal, and provides the common voltage signal to the output end. The embodiment of the invention can save peripheral circuits, improve the integration level and reduce the power consumption while realizing the display and switching of the wide and narrow visual angles.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a wide and narrow viewing angle switching circuit, a display device, and a viewing angle control method.
Background
With the continuous development of display technology, people put more and more demands on display devices. At present, display devices gradually develop towards a wide viewing angle, but people pay more attention to personal privacy, and in some cases, the display devices are expected to have a smaller viewing angle and to be capable of preventing peeping. Therefore, a display device of a multi-view mode is appearing on the market.
In the prior art, a viewing angle control signal is often generated by peripheral circuits such as a single chip, a digital-to-analog converter, an operational amplifier and the like, so that the viewing angle control of the display device is realized. However, in the prior art, the area of the printed circuit board occupied by the peripheral circuit for realizing control is large, which is not beneficial to integration; and under various visual angle modes, peripheral circuits are in working states, and power consumption is large.
Therefore, a new technical solution is desired to reduce the integration area and power consumption while the display device realizes the multi-view mode.
Disclosure of Invention
In view of the foregoing, an object of the present invention is to provide a wide and narrow viewing angle switching circuit, a display device, and a viewing angle control method, which can save peripheral circuits, improve integration, and reduce power consumption while achieving wide and narrow viewing angle display and switching.
According to an aspect of the present invention, there is provided a wide and narrow viewing angle switching circuit including: an input for receiving a first voltage signal; an output terminal for outputting a common voltage signal; the control module is used for generating a selection signal according to the mode switching signal; the mode selection module is used for providing a first path and a second path and gating one of the first path and the second path according to the selection signal; and an operation module connected to the output terminal, wherein the mode selection module includes: the first switch unit is respectively connected with the input end and the output end and is used for controlling the on-off of the first path; the second switch unit is respectively connected with the input end and the output end and is used for controlling the on-off of the second path; the control module includes: the decoder is respectively connected with the first switch unit and the second switch unit, the first switch unit and the second switch unit are controlled to be switched on or switched off according to the selection signal, when the first path is gated, the first switch unit is switched on, the second switch unit is switched off, the operation module receives power supply voltage through the first path, generates the public voltage signal according to the first voltage signal and provides the public voltage signal to the output end; when the second path is gated, the first switch unit is switched off, the second switch unit is switched on, the input end is connected with the output end through the second path, and the output end outputs the first voltage signal as the common voltage signal; the wide and narrow viewing angle switching circuit provides signals required by a wide viewing angle and a narrow viewing angle respectively when the first path or the second path is gated.
Preferably, the wide-narrow viewing angle switching circuit further includes a first power supply terminal connected to the mode selection module, and configured to provide a first power supply voltage to the operation module; and a second power supply terminal connected to the mode selection module, for providing a second power supply voltage to the operation module, wherein when the first path is gated, the first power supply terminal and the second power supply terminal respectively provide the first power supply voltage and the second power supply voltage to the operation module; when the second path is gated, the first power supply end and the second power supply end stop providing the first power supply voltage and the second power supply voltage for the operation module, and the operation module is in a low power consumption mode.
Preferably, the control module comprises a processor for generating the selection signal; the memory is connected with the processor and used for storing information required by the processor; and the digital-to-analog converter is respectively connected with the processor and the operation module, and generates and outputs an initial output voltage signal to the operation module for operation under the control of the processor.
Preferably, the operational module comprises a first operational amplifier, a first input end of the first operational amplifier is connected to the input end to receive the first voltage signal, and a second input end of the first operational amplifier is connected to an output end of the first operational amplifier; the first input end of the second operational amplifier is connected to the control module, and the second input end of the second operational amplifier is connected to the output end of the second operational amplifier; a third operational amplifier, a first input terminal of the third operational amplifier is connected to the second power supply terminal to receive the second power supply voltage, and a second input terminal is connected to the output terminal of the third operational amplifier; and a fourth operational amplifier, a first input terminal of the fourth operational amplifier being connected to the first operational amplifier output terminal, the second operational amplifier output terminal and the third operational amplifier output terminal, respectively, a second input terminal of the fourth operational amplifier being connected to the fourth operational amplifier output terminal, the fourth operational amplifier output terminal being connected to the output terminal.
Preferably, the operational module further includes a first resistor, which is respectively connected to the output end of the first operational amplifier and the first input end of the fourth operational amplifier; the second resistor is respectively connected with the output end of the second operational amplifier and the first input end of the fourth operational amplifier; the third resistor is respectively connected with the output end of the third operational amplifier and the first input end of the fourth operational amplifier; one end of the fourth resistor is connected to the first input end of the fourth operational amplifier, and the other end of the fourth resistor is grounded; the fifth resistor is respectively connected with the second input end of the fourth operational amplifier and the output end of the fourth operational amplifier; one end of the sixth resistor is connected to the second input end of the fourth operational amplifier, and the other end of the sixth resistor is grounded; the seventh resistor is respectively connected with the first input end of the third operational amplifier and the second power supply end; and one end of the eighth resistor is connected to the first input end of the third operational amplifier, and the other end of the eighth resistor is grounded.
Preferably, the mode selection module includes a first switch tube, which is respectively connected to the input end, the first input end of the first operational amplifier, and the control module, and the first switch tube is turned on or off under the control of the selection signal; the second switching tube is respectively connected with the input end, the output end and the control module, and the second switching tube is switched on or off under the control of the selection signal; the third switching tube is respectively connected with the first power supply end and the operation module, and the third switching tube is switched on or off under the control of the selection signal; and a fourth switching tube connected to the second power supply terminal and the operation module, respectively, and turned on or turned off under the control of the selection signal, wherein the first power supply terminal and the second power supply terminal are used to provide the power supply voltage as a reference voltage to the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier.
Preferably, when the first path is gated, the first switching tube, the third switching tube and the fourth switching tube are closed, the second switching tube is opened, and the output end outputs the common voltage signal; when the second path is gated, the first switch tube, the third switch tube and the fourth switch tube are disconnected, the second switch tube is closed, and the output end outputs the first voltage signal.
Preferably, the first voltage signal received by the input terminal is a dc common voltage signal; when the first path is gated, the public voltage signal output by the output end is an alternating public voltage signal; the output terminal outputs the first voltage signal when the second path is gated.
According to another aspect of the present invention, there is provided a display device including the wide and narrow viewing angle switching circuit as described above.
According to still another aspect of the present invention, there is provided a viewing angle control method including the steps of: receiving a visual angle control signal; determining a view mode according to the view control signal, wherein the view mode at least comprises a first view mode and a second view mode; under the first visual angle mode, a first path of a wide and narrow visual angle switching circuit is conducted, and control voltage required by the first visual angle mode is output through the first path; and under the second visual angle mode, a second path of the wide and narrow visual angle switching circuit is conducted, and the control voltage required by the second visual angle mode is output through the second path.
The wide and narrow viewing angle switching circuit, the display device and the viewing angle control method provided by the embodiment of the invention can realize the display in a multi-viewing angle mode, and at least one part of the circuit is correspondingly conducted according to a specific viewing angle mode; in some viewing angle modes, part of electronic elements in the circuit are in a power-off and non-operating state, so that power consumption is reduced.
The wide and narrow visual angle switching circuit, the display device and the visual angle control method provided by the embodiment of the invention can save peripheral circuits and are beneficial to small-size integration.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic block diagram of a wide-narrow viewing angle switching circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a wide-and-narrow viewing angle switching circuit according to an embodiment of the present invention;
fig. 3 illustrates a voltage waveform diagram of an initial output voltage in a narrow viewing angle mode according to an embodiment of the present invention;
fig. 4 illustrates a voltage waveform diagram of an output terminal in a narrow view angle mode according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a viewing angle control method according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
Fig. 1 shows a schematic block diagram of a wide-narrow viewing angle switching circuit according to an embodiment of the present invention. As shown in fig. 1, the wide and narrow viewing angle switching circuit includes a control module 100, a mode selection module 200, and an operation module 300.
The control module 100 is respectively connected to the mode selection module 200 and the operation module 300, and is configured to generate a selection signal SEL and an initial output voltage signal Va in the narrow viewing angle mode according to a mode selection signal (e.g., a viewing angle control signal HVA).
The mode selection module 200 is connected to the INPUT terminal INPUT, the first power supply terminal and the second power supply terminal to receive the dc voltage VDC, the first power supply voltage VGH and the second power supply voltage VGL, respectively. The first power supply voltage VGH is greater than the second power supply voltage VGL. The mode selection module 200 is also connected to the control module 100 to receive the selection signal SEL so as to provide corresponding output signals according to different states of the selection signal SEL.
The operation module 300 receives the first power voltage VS + and the second power voltage VS provided by the mode selection module 200, so as to provide the OUTPUT voltage Vout to the OUTPUT terminal OUTPUT according to the initial OUTPUT voltage Va provided by the control module 100 under the driving action of the first power voltage VS + and the second power voltage VS-.
Specifically, the INPUT terminal INPUT of the wide and narrow viewing angle switching circuit receives an INPUT voltage Vin (first voltage signal), which is, for example, a common voltage signal DCVCOM output by the LCD.
The display modes include at least two of a wide viewing angle mode and a narrow viewing angle mode. The wide visual angle mode has a larger visual angle and good display effect; the narrow visual angle mode has a narrow visual angle and can realize the peep-proof function. The different states of the view angle control signal HVA are used to indicate the wide view angle mode and the narrow view angle mode, respectively. The selection signal SEL is used for realizing switching control of a wide viewing angle mode and a narrow viewing angle mode, namely, different states of the selection signal SEL correspond to different viewing angle modes. In the narrow viewing angle mode, the alternating current component variation of the initial output voltage Va may coincide with the alternating current component variation of the common voltage required for the narrow viewing angle mode, but the direct current component of the initial output voltage Va may be different from the direct current component of the common voltage required for the narrow viewing angle mode; in the wide view mode, the control module 100 may choose not to provide the initial output voltage Va or to provide only the zeroed initial output voltage Va.
When the selection signal SEL indicates the narrow view mode, the mode selection module 200 drives the operation module 300 to provide the OUTPUT voltage Vout to the OUTPUT terminal OUTPUT according to the first power voltage VS + and the second power voltage VS provided by the first power voltage VGH and the second power voltage VGL; when the selection signal SEL indicates the wide view mode, the mode selection module 200 provides an OUTPUT voltage Vout to the OUTPUT terminal OUTPUT according to an input voltage Vin (e.g., a dc voltage VDC).
In the narrow viewing angle mode, the operation module 300 receives the first power voltage VS + and the second power voltage VS provided by the mode selection module 200, so that the operation module operates the initial OUTPUT voltage Va provided by the control module 100 under the driving of the first power voltage VS + and the second power voltage VS-, to provide the OUTPUT voltage Vout to the OUTPUT terminal OUTPUT.
As an alternative embodiment, the OUTPUT terminal OUTPUT provides the OUTPUT voltage Vout to the common electrode of the display panel, thereby providing the common voltage including the ac component required at the common electrode of the display panel in the narrow viewing angle mode and providing the common voltage in the dc form required at the common electrode of the display panel in the wide viewing angle mode.
According to the embodiment of the invention, different common voltages required by wide visual angles or narrow visual angles are provided by controlling the common voltage at the common electrode in the display panel, and the driving of the wide visual angles and the switching of the wide visual angles and the narrow visual angles can be respectively realized.
Fig. 2 is a schematic circuit diagram of a wide-and-narrow-viewing-angle switching circuit according to an embodiment of the present invention.
As an alternative embodiment, as shown in fig. 2, the control module 100 includes a processor 110, a decoder 120, and a digital-to-analog converter 130. The processor 110 controls the decoder 120 to output a corresponding one-bit or multi-bit selection signal SEL according to the view angle control signal HVA, and provides a digital waveform signal to the digital-to-analog converter 130, so that the digital-to-analog converter 130 converts the digital waveform signal into a corresponding initial voltage Va.
As an alternative embodiment, the control module 100 may not include the decoder 120, and the processor 110 may output the corresponding one or more bit selection signals SEL directly according to the view angle control signal HVA.
As an alternative embodiment, as shown in fig. 2, the control module 100 may further include a memory 140 for storing preset waveform data and providing the waveform data to the processor 110, so that the processor 110 can provide a digital waveform signal to the digital-to-analog converter 130 according to the waveform data. Preferably, the memory 140 is implemented by a nonvolatile memory (e.g., EPROM), and may receive externally provided waveform data through the IIC bus.
As an alternative embodiment, the mode selection module 200 includes a plurality of selection switches, and the number of the selection switches corresponds to the number of bits of the selection signal SEL, so that each bit of the selection signal SEL is used for controlling the on and off of a corresponding one of the selection switches, respectively. The number of bits of the selection signal SEL and the number of corresponding selection switches may be specifically set according to practical applications and requirements, and is not limited to the following embodiment employing 4 selection switches.
As an alternative embodiment, as shown in fig. 2, the mode selection module 200 includes, for example, 4 selection switches sw1 to sw 4. When the selection signal SEL indicates the wide view mode, the second path is turned on, the selection switch sw2 is turned on to directly OUTPUT the dc voltage VDC (e.g., the INPUT voltage Vin INPUT from the INPUT terminal INPUT) as the OUTPUT voltage Vout to the OUTPUT terminal OUTPUT, and the selection switches sw1, sw3 and sw4 are all turned off, the mode selection module 200 does not drive the operation module 300; when the selection signal SEL indicates the narrow view mode, the first path is gated, the selection switch sw2 is turned off, and the selection switches sw1, sw3 and sw4 are turned on, so that the dc voltage VDC, the first power supply voltage VGH and the second power supply voltage VGL are respectively used as the first bias voltage V1, the first power supply voltage VS + and the second power supply voltage VS-to be OUTPUT to the operation module 300 through the mode selection module 200, so as to drive the operation module 300 to generate the corresponding OUTPUT voltage Vout to the OUTPUT terminal OUTPUT.
As an alternative embodiment, the selection switches sw1 to sw4 are MOS switch tubes. The INPUT end INPUT is respectively connected with the first switch tube sw1 and the second switch tube sw 2. The first switch tube sw1 is further connected to the control module 100 and the operation module 300 respectively. The second switch tube sw2 is further connected to the control module 100 and an OUTPUT terminal OUTPUT respectively, and the OUTPUT terminal OUTPUT is connected to a common electrode of the display panel. The third switch tube sw3 is respectively connected to the first power supply voltage VGH, the control module 100 and the operation module 300, and provides the first power supply voltage VS + to the operation module 300. The fourth switch tube sw4 is connected to the second power supply voltage VGL, the control module 100 and the operation module 300 respectively. The first power supply voltage VGH and the second power supply voltage VGL are respectively connected to the operation module 300 through the third switch tube sw3 and the fourth switch tube sw4, and respectively provide the first power supply voltage VS + and the second power supply voltage VS-as reference voltages of the operation module 300.
As an alternative embodiment, as shown in fig. 2, the operation module 300 may further include a voltage dividing circuit (for example, implemented by a plurality of resistors connected in series) for obtaining the second bias voltage V2 through voltage division, and the second bias voltage V2 may be a positive voltage or a negative voltage. For example, the voltage dividing circuit divides the second power supply voltage VS-to obtain the second bias voltage V2, and the voltage at the node Q is the second bias voltage.
As an alternative embodiment, as shown in fig. 2, the operation module 300 may further include a plurality of voltage followers, each of which is implemented by, for example, an operational amplifier connected in negative feedback, and positive and negative power terminals of each operational amplifier respectively receive the first power voltage VS + and the second power voltage VS-. The first bias voltage V1, the second bias voltage V2 and the initial output voltage Va are respectively input to the addition operation circuit through corresponding voltage followers, such as first to third operational amplifiers (OP1 to OP3), to improve signal isolation and avoid signal interference.
As an alternative embodiment, the control module 100 is connected to the mode selection module 200 and the operation module 300 respectively, and includes a decoder 120 directly connected to the mode selection module 200, a digital-to-analog converter 130 directly connected to the operation module 300, a processor 110, and a memory 140. The DECODER 120 is, for example, a DECODER, and the processor 110 is, for example, a micro control unit MCU.
The decoder 120 is connected to the processor 110 and the first to fourth switching tubes (sw1 to sw4), respectively. The decoder 120 logically controls the on and off of each switch tube (sw1 to sw4) under the control of the processor 110.
The processor 110 is connected to the decoder 120, the dac 130, and the memory 140, and receives the external operating voltage V3, the view angle control signal HVA, and the waveform generation trigger synchronization signal STV.
The digital-to-analog converter 130 is connected to the processor 110 and the operation module 300, respectively, for converting the digital signal into an analog signal.
The memory 140 is coupled to the processor 110 for storage of information. The memory 140 is also connected to and controlled by the control line SCL and the data line SDL, respectively.
The operational module 300 includes a plurality of operational amplifiers and a plurality of resistors, for example, first to fourth operational amplifiers (OP1 to OP4), first to eighth resistors (R1 to R8).
The first input terminal (for example, the non-inverting input terminal) of the first operational amplifier OP1 is connected to the first switch sw1, and the second input terminal (for example, the inverting input terminal) is connected to the output terminal, thereby forming a negative feedback. The output terminal of the first operational amplifier OP1 is connected to the node P via a first resistor R1.
The first input terminal of the second operational amplifier OP2 is connected to the digital-to-analog converter 130, and the second input terminal is connected to the output terminal to form negative feedback. The output terminal of the second operational amplifier OP2 is connected to the node P via a second resistor R2.
The first input terminal of the third operational amplifier OP3 is connected to the node Q, and the second input terminal is connected to the output terminal, forming negative feedback. The output terminal of the third operational amplifier OP3 is connected to the node P via a third resistor. The node Q is further connected to the seventh resistor R7 and the eighth resistor R8, respectively, and the node Q is connected to the second power voltage VS-via the seventh resistor R7 and to the ground via the eighth resistor R8. Through the voltage division effect of the resistors, a second bias voltage V2 is obtained at the node Q.
The first input terminal of the fourth operational amplifier OP4 is connected to a node P, which is also connected to ground via a fourth resistor R4. A second input terminal of the fourth operational amplifier OP4 is connected to the fifth resistor R5 and the sixth resistor R6, respectively, and the second input terminal is connected to the output terminal of the fourth operational amplifier OP4 via the fifth resistor R5 and is grounded via the sixth resistor R6. The OUTPUT terminal of the fourth operational amplifier OP4 is directly connected to the OUTPUT terminal OUTPUT.
The first to fourth operational amplifiers (OP1 to OP4) receive the first power supply voltage VS + and the second power supply voltage VS-as reference voltages of the operational amplifiers, respectively, so that the waveform amplitudes reach desired values.
As an alternative embodiment, the non-inverting INPUT of the first operational amplifier OP1 receives the voltage signal at the INPUT, and the output outputs the voltage signal to the non-inverting INPUT of the fourth operational amplifier OP 4. The non-inverting input terminal of the second operational amplifier OP2 receives the voltage signal output by the digital-to-analog converter 130, and the output terminal outputs the voltage signal to the non-inverting input terminal of the fourth operational amplifier OP 4. The non-inverting input terminal of the third operational amplifier OP3 receives the second bias voltage V2, and the output terminal outputs a voltage signal to the non-inverting input terminal of the fourth operational amplifier OP 4. The fourth operational amplifier OP4 adds the voltage signals at the non-inverting input terminal, and the OUTPUT terminal OUTPUTs the OUTPUT voltage Vout to the OUTPUT terminal OUTPUT.
As an alternative embodiment, the INPUT terminal INPUT receives an INPUT voltage Vin (e.g. a dc common voltage signal DCVCOM). The processor 110 receives the external operating voltage V3, the view angle control signal HVA, and the waveform generation trigger synchronization signal STV, and determines the display mode according to the view angle control signal HVA.
When in the narrow viewing angle mode, the operation module 300 generates an output voltage Vout according to an initial output voltage Va and a plurality of bias voltages. For example, in the solution shown in fig. 2, the operation module 300 includes an addition circuit that adds the first offset voltage V1 derived from the mode selection module 200, the initial output voltage Va derived from the control module 100, and the second offset voltage V2 to generate the output voltage Vout. The waveform of the output voltage Vout is, for example, symmetrically distributed with respect to the level at which the sum of the first bias voltage V1 and the bias voltage VSET is present, so that the display panel can be driven into the narrow viewing angle display mode.
Fig. 3 illustrates a voltage waveform diagram of an initial output voltage in a narrow viewing angle mode according to an embodiment of the present invention. Fig. 4 illustrates a voltage waveform diagram of an output terminal in a narrow viewing angle mode according to an embodiment of the present invention.
As an alternative embodiment, when in the narrow viewing angle mode, the processor 110 gates the first path, reads the information stored in the memory 140, and configures the dac 130 to generate an initial waveform (initial OUTPUT voltage) with a certain amplitude, such as a waveform with a valley of 0V and a period, shape, and PK-PK amplitude consistent with an Ac Common Voltage (ACVCOM) to be OUTPUT at the OUTPUT terminal OUTPUT (as shown in fig. 3). The initial waveform is output to the node P after passing through the voltage of the second operational amplifier circuit OP 2.
The common voltage signal DCVCOM is inputted from the INPUT terminal INPUT, and is inputted to the first operational amplifier OP1 through the first switch sw1, and is further outputted to the node P. The second bias voltage V2 is output to the node P through the third operational amplifier OP 3. The fourth operational amplifier OP4 adds the first bias voltage V1 from the mode selection module 200, the initial output voltage Va from the control module 100, and the second bias voltage V2 (e.g., the bias voltage VSET) from the output of the third operational amplifier OP3 to generate the output voltage Vout. The output voltage Vout is an ac voltage ACVCOM that ultimately meets the requirement of the narrow view mode, i.e. has a waveform with (DCVCOM + VSET) as the symmetry axis and the same shape as the initial waveform (as shown in fig. 4).
When in the wide view mode, the second path is gated, and the processor 110 controls the decoder 120 to open the first switch sw1, the third switch sw3 and the fourth switch sw4 and close the second switch sw2, thereby stopping the supply of the reference voltage to the first to fourth operational amplifiers (OP1 to OP 4). The control module 100 is simultaneously in a low power mode, for example, stopping reading the memory 140, and the dac 130 and the operational amplifiers are in a power-off inactive mode. The common voltage signal DCVCOM is directly OUTPUT from the OUTPUT terminal OUTPUT via the second switch tube sw 2.
It should be noted that fig. 3 and 4 illustrate sine waves as an example, but the voltage waveform of the embodiment of the present invention is not limited to sine waves, and may be square waves, triangular waves, or the like.
Fig. 5 is a flowchart illustrating a viewing angle control method according to an embodiment of the present invention. As shown in fig. 5, the viewing angle control method includes the steps of:
in step S501, an input voltage signal and a viewing angle control signal are received;
the input terminal of the wide-narrow viewing angle switching circuit receives an input voltage signal (first voltage signal), such as a common voltage signal DCVCOM input by the LCD. The control module 100 receives a view angle control signal HVA.
In step S502, it is determined whether or not in the narrow viewing angle mode, and when it is determined yes, step S503 is performed; when the judgment is no, step S505 is executed.
Judging whether the device is in a narrow viewing angle mode according to the viewing angle control signal HVA, and if so (namely in the narrow viewing angle mode), executing step S503; when the determination is no (i.e., in the wide view angle mode), step S505 is performed.
In step S503, the first path is turned on, and the second path is turned off;
in the narrow view angle mode, the first path is turned on and the second path is turned off, and taking the circuit shown in fig. 2 as an example, the first switching tube sw1, the third switching tube sw3, and the fourth switching tube sw4 are closed (the first path is turned on) and the second switching tube sw2 is turned off (the second path is turned off). The voltage signal received by the input terminal and the waveform generated by the digital-to-analog converter 130 are processed by a plurality of operational amplifiers.
In step S504, a narrow viewing angle control voltage is output.
After step S503 is executed, step S504 is executed. After the processing of step S503, a narrow viewing angle control voltage is obtained, and the control voltage ACVCOM meeting the requirement of the narrow viewing angle mode is output to the common electrode of the display panel.
In step S505, the second path is turned on, and the first path is turned off;
in the wide view angle mode, the second path is turned on and the first path is turned off, and taking the circuit shown in fig. 2 as an example, the second switching tube sw2 is closed (the second path is turned on), and the first switching tube sw1, the third switching tube sw3 and the fourth switching tube sw4 are turned off (the first path is turned off).
In step S506, a wide viewing angle control voltage is output.
After step S505 is executed, step S506 is executed. And the voltage signal received by the input end passes through a second path and outputs a voltage signal meeting the requirement of the wide view angle mode to a common electrode of the display panel. Taking the circuit shown in fig. 2 as an example, the common voltage DCVCOM received at the input terminal is directly outputted as the wide viewing angle control voltage.
It should be noted that different electronic devices are connected to the first path and the second path to satisfy the narrow viewing angle mode and the wide viewing angle mode, respectively. The electronic devices connected to the first and second paths are different, so that different power consumptions are respectively provided in the wide and narrow viewing angle modes. Optionally, at least a portion of the electronic device is shared by the first path and the second path.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A wide-narrow viewing angle switching circuit, comprising:
an input for receiving a first voltage signal;
an output terminal for outputting a common voltage signal;
the control module is used for generating a selection signal according to the mode switching signal;
the mode selection module is used for providing a first path and a second path and gating one of the first path and the second path according to the selection signal; and
an operation module connected with the output end,
wherein the mode selection module comprises:
the first switch unit is respectively connected with the input end and the output end and is used for controlling the on-off of the first path;
the second switch unit is respectively connected with the input end and the output end and is used for controlling the on-off of the second path;
the control module includes:
a decoder connected to the first switch unit and the second switch unit respectively, for controlling the first switch unit and the second switch unit to be turned on or off according to the selection signal,
when the first path is gated, the first switch unit is closed, the second switch unit is opened, the operation module receives power supply voltage through the first path, generates the common voltage signal according to the first voltage signal, and provides the common voltage signal to the output end; when the second path is gated, the first switch unit is switched off, the second switch unit is switched on, the input end is connected with the output end through the second path, and the output end outputs the first voltage signal as the common voltage signal; the wide and narrow viewing angle switching circuit provides signals required by a wide viewing angle and a narrow viewing angle respectively when the first path or the second path is gated.
2. The wide-narrow viewing angle switching circuit according to claim 1, further comprising:
the first power supply end is connected with the mode selection module and used for providing a first power supply voltage for the operation module; and
the second power supply end is connected with the mode selection module and used for providing a second power supply voltage for the operation module, wherein when the first path is gated, the first power supply end and the second power supply end respectively provide the first power supply voltage and the second power supply voltage for the operation module;
when the second path is gated, the first power supply end and the second power supply end stop providing the first power supply voltage and the second power supply voltage for the operation module, and the operation module is in a low power consumption mode.
3. The wide-narrow viewing angle switching circuit of claim 1, wherein the control module comprises:
a processor for generating the selection signal;
the memory is connected with the processor and used for storing information required by the processor; and
and the digital-to-analog converter is respectively connected with the processor and the operation module, and generates and outputs an initial output voltage signal to the operation module for operation under the control of the processor.
4. The wide-narrow viewing angle switching circuit according to claim 1, wherein the operation module comprises:
a first operational amplifier having a first input terminal connected to the input terminal for receiving the first voltage signal and a second input terminal connected to a first operational amplifier output terminal;
the first input end of the second operational amplifier is connected to the control module, and the second input end of the second operational amplifier is connected to the output end of the second operational amplifier;
a third operational amplifier, a first input terminal of the third operational amplifier is connected to the second power supply terminal to receive the second power supply voltage, and a second input terminal is connected to the output terminal of the third operational amplifier; and
and the first input end of the fourth operational amplifier is respectively connected to the output end of the first operational amplifier, the output end of the second operational amplifier and the output end of the third operational amplifier, the second input end of the fourth operational amplifier is connected to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is connected to the output end of the fourth operational amplifier.
5. The wide-narrow viewing angle switching circuit according to claim 4, wherein the operation module further comprises:
the first resistor is respectively connected with the output end of the first operational amplifier and the first input end of the fourth operational amplifier;
the second resistor is respectively connected with the output end of the second operational amplifier and the first input end of the fourth operational amplifier;
the third resistor is respectively connected with the output end of the third operational amplifier and the first input end of the fourth operational amplifier;
one end of the fourth resistor is connected to the first input end of the fourth operational amplifier, and the other end of the fourth resistor is grounded;
the fifth resistor is respectively connected with the second input end of the fourth operational amplifier and the output end of the fourth operational amplifier;
one end of the sixth resistor is connected to the second input end of the fourth operational amplifier, and the other end of the sixth resistor is grounded;
the seventh resistor is respectively connected with the first input end of the third operational amplifier and the second power supply end;
and one end of the eighth resistor is connected to the first input end of the third operational amplifier, and the other end of the eighth resistor is grounded.
6. The wide-narrow viewing angle switching circuit of claim 4, wherein the mode selection module comprises:
the first switching tube is respectively connected with the input end, the first input end of the first operational amplifier and the control module, and the first switching tube is switched on or off under the control of the selection signal;
the second switching tube is respectively connected with the input end, the output end and the control module, and the second switching tube is switched on or off under the control of the selection signal;
the third switching tube is respectively connected with the first power supply end and the operation module, and the third switching tube is switched on or off under the control of the selection signal; and
a fourth switching tube respectively connected with the second power supply end and the operation module, the fourth switching tube is switched on or off under the control of the selection signal,
the first power supply end and the second power supply end are used for providing the power supply voltage to the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier to serve as reference voltages.
7. The wide-narrow viewing angle switching circuit according to claim 6, wherein when the first path is gated on, the first switch tube, the third switch tube and the fourth switch tube are closed, the second switch tube is opened, and the output terminal outputs the common voltage signal;
when the second path is gated, the first switch tube, the third switch tube and the fourth switch tube are disconnected, the second switch tube is closed, and the output end outputs the first voltage signal.
8. The wide-narrow viewing angle switching circuit of claim 1, wherein the first voltage signal received by the input terminal is a dc common voltage signal;
when the first path is gated, the public voltage signal output by the output end is an alternating public voltage signal;
the output terminal outputs the first voltage signal when the second path is gated.
9. A display device comprising the wide-narrow viewing angle switching circuit according to any one of claims 1 to 8.
10. A viewing angle control method, characterized by comprising the steps of:
receiving a visual angle control signal;
determining a view mode according to the view control signal, wherein the view mode at least comprises a first view mode and a second view mode;
under the first visual angle mode, a first path of a wide and narrow visual angle switching circuit is conducted, and control voltage required by the first visual angle mode is output through the first path;
and under the second visual angle mode, a second path of the wide and narrow visual angle switching circuit is conducted, and the control voltage required by the second visual angle mode is output through the second path.
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| CN201910913110.XA CN110675796B (en) | 2019-09-25 | 2019-09-25 | Wide-narrow viewing angle switching circuit, display device and viewing angle control method |
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