CN217086113U - Discharge circuit and display device thereof - Google Patents
Discharge circuit and display device thereof Download PDFInfo
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- CN217086113U CN217086113U CN202220631321.1U CN202220631321U CN217086113U CN 217086113 U CN217086113 U CN 217086113U CN 202220631321 U CN202220631321 U CN 202220631321U CN 217086113 U CN217086113 U CN 217086113U
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Abstract
The application discloses a discharge circuit and a display device thereof, comprising a control unit, wherein an input end receives a shutdown control signal, and an output end provides a control signal based on the level state of the shutdown control signal; and the switching unit is connected with the output end of the control unit to receive the control signal and connects the common voltage input end of the display device with the common voltage supply end to display the picture or with the reference ground end to discharge the common voltage input end according to the level state of the control signal. The utility model provides a discharge circuit and display device thereof provides reliable and stable public voltage to display device based on shutdown control signal's level state to make display device carry out the picture display at normal during operation, and discharge in order to avoid shutting the ghost to the public voltage input rapidly when shutting down, and then promoted display device's reliability through low-cost, simple circuit structure.
Description
Technical Field
The utility model relates to a show technical field, in particular to discharge circuit and display device thereof.
Background
In a Liquid Crystal Display (LCD) device, each pixel in a Display panel is fully charged with a certain amount of charges when the LCD device is in an operating state, and when the LCD device is turned off, a ghost phenomenon occurs due to slow disappearance of the charges in the Display panel.
In order to solve the above problems, when the display panel is powered off, all the gate lines in the display panel are simultaneously turned on by driving the gate driving circuit, and on the basis, the pixels in the display panel have different polarities, so that charges in the pixels of the display panel can be mutually neutralized, and the afterimage when the display panel is powered off is eliminated. However, the above method has a long discharge time and an undesirable effect.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a discharge circuit and a display device thereof, so as to provide different voltages to a common voltage input terminal of the display device according to a level state of a shutdown control signal, so that the display device displays a picture in normal operation, and discharges the common voltage input terminal rapidly in a shutdown state to avoid occurrence of shutdown ghost phenomenon.
According to an aspect of the present invention, there is provided a discharge circuit, including:
the input end of the control unit receives a shutdown control signal, and the output end provides a control signal based on the level state of the shutdown control signal; and
and the switching unit is connected with the output end of the control unit to receive the control signal and connects a common voltage input end of the display device with a common voltage supply end to display a picture or with a reference ground end to discharge the common voltage input end according to the level state of the control signal.
Optionally, the switching unit includes:
and the control end of the first switching tube receives the control signal, the first path end is connected with the reference ground end, and the second path end is respectively connected with the public voltage supply end and the public voltage input end.
Optionally, the control unit comprises:
a first resistor;
the first end of the first capacitor is connected with the first end of the first resistor and receives the reference negative voltage, and the second end of the first capacitor is grounded;
and the control end of the second switch tube is connected with the second end of the first capacitor, the first path end receives the shutdown control signal, and the second path end is connected with the second end of the first resistor.
Optionally, the control unit further comprises:
and the first input end of the operational amplifier receives the shutdown control signal, the output end of the operational amplifier is connected with the first access end of the second switching tube, and the second input end of the operational amplifier is connected with the output end.
Optionally, the control unit further comprises:
and the cathode of the diode receives the reference negative voltage, and the anode of the diode is connected with the first end of the first resistor.
Optionally, the first switching tube is a P-type MOS tube, and/or the second switching tube is a P-type MOS tube.
Optionally, the switching unit further includes:
and the first end of the second resistor is connected with the second path end of the first switching tube, and the second end of the second resistor is connected with the public voltage supply end.
Optionally, the control unit further comprises:
the first end of the second capacitor is connected with the anode of the diode, and the second end of the second capacitor is grounded; and
and the first end of the third resistor is connected with the anode of the diode, and the second end of the third resistor is connected with the first end of the first resistor.
According to another aspect of the present invention, there is provided a display device, comprising a reference ground;
a common voltage supply terminal for supplying a common voltage;
a display panel including a common voltage input terminal; and
the discharge circuit described above.
Optionally, the method further comprises:
and the power supply provides a shutdown control signal for the discharge circuit.
The utility model provides a discharge circuit and display device thereof, discharge circuit provide the end with display device's public voltage input and public voltage based on shutdown control signal's level state and are connected display frame or be connected with reference ground end and discharge in order to the public voltage input. Namely, the discharge circuit can provide stable and reliable public voltage for the display device so as to enable the display device to display pictures during normal operation, and discharge the public voltage input end rapidly during shutdown so as to avoid shutdown ghost shadow, thereby improving the reliability of the display device through a low-cost and simple circuit structure.
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 structural diagram of a display device according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of a discharge circuit provided according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram of another discharge circuit provided in accordance with an embodiment of the present invention.
Fig. 4 shows a schematic diagram of a waveform of a discharge circuit provided in accordance with 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.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.
Fig. 1 shows a schematic structural diagram of a display device according to an embodiment of the present invention.
As shown in fig. 1, a display device 1000 in the present embodiment will be described in detail by taking a liquid crystal display device as an example. The display device 1000 includes a display panel 100, a gate driving circuit 220, a source driving circuit 210, a timing control circuit 230, a power supply 240, and a discharge circuit 300.
The display panel 100 includes a pixel array including a plurality of pixel units 110, the display panel 100 has a first substrate, a second substrate and a liquid crystal molecule layer therebetween, the first substrate and the second substrate are opposite to each other, an electric field is generated between a common electrode and a pixel electrode on the first substrate and the second substrate, the electric field controls the rotation of the liquid crystal molecules, and thus the light transmittance of each pixel unit 110 is changed to realize image display.
The source driving circuit 210 and the gate driving circuit 220 cooperate to write the gray-scale signal DATA into each pixel unit 110 of the pixel electrode. Further, the timing control circuit 230 outputs the start signal to the gate driving circuit 220 and outputs the initial data to the source driving circuit 210. The gate driving circuit 220 transmits gate driving signals to the display panel 100 through the gate lines, and the source driving circuit 210 transmits gray-scale signals DATA to the pixel units 110 of the display panel 100 through the DATA lines and writes the gray-scale signals DATA into the pixel electrodes. Further, a power supply 240 is coupled to the timing control circuit 230 to provide power thereto and may provide associated control signals thereto.
The display device 1000 further includes a ground reference terminal and a common voltage supply terminal. Further, the reference ground terminal and the common voltage supply terminal are provided, for example, on the power supply 240, to which the relevant voltages are supplied by the power supply 240.
The input terminal of the discharging circuit 300 is connected to the reference ground terminal and the common voltage providing terminal, respectively, the common voltage providing terminal provides the input voltage VCOM-IN, the output terminal of the discharging circuit 300 is connected to the common voltage input terminal of the display panel 100 IN the display device 1000 to provide the common voltage VCOM-OUT, and the control terminal of the discharging circuit 300 receives the power-off control signal XON. The shutdown control signal XON is provided by the power supply 240, for example. When the shutdown control signal XON is in an active level state (indicating that the display device is shutdown), the discharge circuit 300 connects and turns on the reference ground and the common voltage input terminal of the display panel 100 via the discharge circuit 300 to discharge the common voltage input terminal. When the shutdown control signal XON is at the inactive level (indicating that the display device is operating normally), the discharge circuit 300 connects and turns on the common voltage supply terminal to the common voltage input terminal of the display panel 100 via the discharge circuit 300 to display the picture normally. Further, the discharge circuit 300 includes a control unit and a switching unit. The input terminal of the control unit serves as a control terminal of the discharge circuit 300 to receive the shutdown control signal XON, and the output terminal of the control unit provides a control signal based on the level state of the shutdown control signal XON. The switching unit is connected with the output end of the control unit to receive the control signal, and connects the common voltage input end of the display device with the common voltage supply end to display the picture or with the reference ground end to discharge the common voltage input end according to the level state of the control signal.
Fig. 2 shows a schematic diagram of a discharge circuit provided according to an embodiment of the present invention.
As shown IN fig. 2, the switching unit 310 of the discharge circuit 300 includes a first switch transistor Q1, a control terminal of the first switch transistor Q1 receives a control signal, a first pass terminal of the first switch transistor Q1 is connected to a ground reference terminal, and a second pass terminal of the first switch transistor Q1 is respectively connected to a common voltage supply terminal for receiving an input voltage VCOM-IN and a common voltage input terminal for providing a common voltage VCOM-OUT. IN other embodiments, the switching unit 310 further includes a second resistor R2, a first terminal of the second resistor R2 is connected to the second path terminal of the first switch transistor Q1, and a second terminal of the second resistor R2 is connected to the common voltage supply terminal to receive the input voltage VCOM-IN.
The control unit 320 of the discharge circuit 300 includes a first resistor R1, a first capacitor C1, and a second switch tube Q2. A first terminal of the first capacitor C1 is connected to a first terminal of the first resistor R1 and receives the reference negative voltage VGL, and a second terminal of the first capacitor C1 is grounded. A control end of the second switch tube Q2 is connected to the second end of the first capacitor C1, a first path end of the second switch tube Q2 receives the shutdown control signal XON, and a second path end of the second switch tube Q2 is connected to the second end of the first resistor R1.
Referring to fig. 4, the discharging circuit 300 is described, for example, with the active level state of the shutdown control signal XON as the high level state when the shutdown control signal XON is in the inactive level state (indicating that the display device is operating normally, and further the power supply voltage VIN provided by the power supply 240 is in the active level state, for example, the high level state). The second switch Q2 of the control unit 320 is turned on, so that the control signal provided to the switching unit 310 is at a high level. The first switch Q1 IN the switch unit 310 is controlled to be turned off by the control signal, and the common voltage supply terminal is connected to the common voltage input terminal, so as to supply the input voltage VCOM-IN as the common voltage VCOM-OUT to the common voltage input terminal of the display panel for displaying the picture. The discharging circuit 300 is described, for example, with the active level state of the shutdown control signal XON being a low level state when the shutdown control signal XON is in an active level state (indicating that the display device is shutdown and the power supply voltage VIN provided by the power supply 240 jumps and then changes to an inactive level state, for example, a low level state). The second switch Q2 of the control unit 320 is turned off, so that the control signal provided to the switching unit 310 is at a low level. The first switch Q1 in the switch unit 310 is controlled by the control signal to turn on, and then the ground reference is connected to the common voltage input terminal to discharge the common voltage input terminal, and the ground reference GND is provided as the common voltage VCOM-OUT to the common voltage input terminal of the display panel to complete the discharge and avoid the shutdown ghost.
Fig. 3 shows a schematic diagram of another discharge circuit provided in accordance with an embodiment of the present invention.
As shown in fig. 3, the discharge circuit 400 is added with some circuit structures on the basis of the discharge circuit 300 to provide a more stable and reliable common voltage to the display panel 100 in the display device 1000. The discharge circuit 400 includes a switching unit 310 and a control unit 420.
The switching unit 310 of the discharging circuit 400 includes a first switch transistor Q1, a control terminal of the first switch transistor Q1 receives a control signal, a first pass terminal of the first switch transistor Q1 is connected to a ground reference terminal, and a second pass terminal of the first switch transistor Q1 is respectively connected to a common voltage supply terminal for receiving the input voltage VCOM-IN and a common voltage input terminal for providing the common voltage VCOM-OUT. IN other embodiments, the switching unit 310 further includes a second resistor R2, a first terminal of the second resistor R2 is connected to the second path terminal of the first switch transistor Q1, and a second terminal of the second resistor R2 is connected to the common voltage supply terminal to receive the input voltage VCOM-IN.
The control unit 420 of the discharge circuit 400 includes a first resistor R1, a first capacitor C1, a second switch tube Q2, and an operational amplifier U. A first terminal of the first capacitor C1 is connected to a first terminal of the first resistor R1 and receives the reference negative voltage VGL, and a second terminal of the first capacitor C1 is grounded. A control end of the second switch tube Q2 is connected to the second end of the first capacitor C1, a first path end of the second switch tube Q2 receives the shutdown control signal XON, and a second path end of the second switch tube Q2 is connected to the second end of the first resistor R1. The first input end of the operational amplifier U receives the shutdown control signal XON, the output end of the operational amplifier U is connected with the first path end of the second switch tube Q2, the second input end of the operational amplifier U is connected with the output end of the operational amplifier U, the positive phase power supply end of the operational amplifier U is connected with the positive voltage VDD, and the reverse phase power supply end of the operational amplifier U is grounded. It should be noted that the operational amplifier U is connected as a voltage follower to avoid the situation that the second switch Q2 is turned on by mistake due to the disturbance of the shutdown control signal XON, which causes the unstable discharge circuit.
In other implementations, the control unit 420 further includes a diode D, a cathode of which receives the reference negative voltage VGL, and an anode of which is connected to the first terminal of the first resistor R1. Further, the control unit 420 further includes a second capacitor C2 and a third resistor R3. A first terminal of the second capacitor C2 is connected to the anode of the diode D, and a second terminal of the second capacitor C2 is connected to ground. A first terminal of the third resistor R3 is connected to the anode of the diode D, and a second terminal of the third resistor R3 is connected to a first terminal of the first resistor R1.
Referring to fig. 4, the discharging circuit 400 is described, for example, when the shutdown control signal XON is in an inactive level state (indicating that the display device is operating normally, and further the power supply voltage VIN provided by the power supply 240 is in an active level state, for example, in a high level state), taking the active level state of the shutdown control signal XON as an example. The second switch Q2 of the control unit 420 is turned on, so that the control signal provided to the switching unit 310 is at a high level. The first switch Q1 IN the switch unit 310 is controlled to be turned off by the control signal, and the common voltage supply terminal is connected to the common voltage input terminal, so as to supply the input voltage VCOM-IN as the common voltage VCOM-OUT to the common voltage input terminal of the display panel for displaying the picture. The discharging circuit 400 is used to illustrate that the active level state of the shutdown control signal XON is the low level state when the shutdown control signal XON is in the active level state (indicating that the display device is shutdown and the power supply voltage VIN provided by the power supply 240 jumps and then changes to the inactive level state, for example, the low level state). The second switch Q2 in the control unit 420 is turned off, so that the control signal provided to the switching unit 310 is low. The first switch Q1 in the switch unit 310 is controlled by the control signal to turn on, and then the ground reference is connected to the common voltage input terminal to discharge the common voltage input terminal, and the ground reference GND is provided as the common voltage VCOM-OUT to the common voltage input terminal of the display panel to complete the discharge and avoid the shutdown ghost.
In the discharge circuit 300 or the discharge circuit 400, the first switching transistor Q1 and the second switching transistor Q2 are both P-type MOS transistors, for example. In other embodiments, at least one of the first switch transistor Q1 and the second switch transistor Q2 may be, for example, an N-type MOS transistor, and accordingly, the connection mode of the path terminal of the corresponding switch transistor is also changed.
The control terminal of the first switch Q1 is the gate of the P-type MOS transistor, the first pass terminal of the first switch Q1 is the source of the P-type MOS transistor, and the second pass terminal of the first switch Q1 is the drain of the P-type MOS transistor. The control end of the second switch tube Q2 is the gate of a P-type MOS transistor, the first pass end of the second switch tube Q2 is the source of the P-type MOS transistor, and the second pass end of the second switch tube Q2 is the drain of the P-type MOS transistor. The first input terminal of the operational amplifier U is, for example, a non-inverting input terminal, and the second input terminal of the operational amplifier U is, for example, an inverting input terminal.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not 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 its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A discharge circuit, comprising:
the input end of the control unit receives a shutdown control signal, and the output end provides a control signal based on the level state of the shutdown control signal; and
and the switching unit is connected with the output end of the control unit to receive the control signal and connects a common voltage input end of the display device with a common voltage supply end to display a picture or with a reference ground end to discharge the common voltage input end according to the level state of the control signal.
2. The discharge circuit of claim 1, wherein the switching unit comprises:
and the control end of the first switching tube receives the control signal, the first path end is connected with the reference ground end, and the second path end is respectively connected with the public voltage supply end and the public voltage input end.
3. The discharge circuit of claim 2, wherein the control unit comprises:
a first resistor;
the first end of the first capacitor is connected with the first end of the first resistor and receives the reference negative voltage, and the second end of the first capacitor is grounded;
and the control end of the second switch tube is connected with the second end of the first capacitor, the first path end receives the shutdown control signal, and the second path end is connected with the second end of the first resistor.
4. The discharge circuit of claim 3, wherein the control unit further comprises:
and the first input end of the operational amplifier receives the shutdown control signal, the output end of the operational amplifier is connected with the first access end of the second switching tube, and the second input end of the operational amplifier is connected with the output end.
5. The discharge circuit of claim 3, wherein the control unit further comprises:
and the cathode of the diode receives the reference negative voltage, and the anode of the diode is connected with the first end of the first resistor.
6. The discharge circuit according to claim 3, wherein the first switch tube is a P-type MOS tube, and/or the second switch tube is a P-type MOS tube.
7. The discharge circuit of claim 2, wherein the switching unit further comprises:
and the first end of the second resistor is connected with the second path end of the first switching tube, and the second end of the second resistor is connected with the public voltage supply end.
8. The discharge circuit of claim 5, wherein the control unit further comprises:
the first end of the second capacitor is connected with the anode of the diode, and the second end of the second capacitor is grounded; and
and the first end of the third resistor is connected with the anode of the diode, and the second end of the third resistor is connected with the first end of the first resistor.
9. A display device, comprising:
a reference ground terminal;
a common voltage supply terminal for supplying a common voltage;
a display panel including a common voltage input terminal; and
the discharge circuit of any of claims 1-8.
10. The display device according to claim 9, further comprising:
and the power supply provides a shutdown control signal for the discharge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220631321.1U CN217086113U (en) | 2022-03-22 | 2022-03-22 | Discharge circuit and display device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220631321.1U CN217086113U (en) | 2022-03-22 | 2022-03-22 | Discharge circuit and display device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217086113U true CN217086113U (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220631321.1U Active CN217086113U (en) | 2022-03-22 | 2022-03-22 | Discharge circuit and display device thereof |
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| CN (1) | CN217086113U (en) |
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- 2022-03-22 CN CN202220631321.1U patent/CN217086113U/en active Active
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