CN210200294U - Display panel's drive circuit and display device - Google Patents
Display panel's drive circuit and display device Download PDFInfo
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- CN210200294U CN210200294U CN201920872336.5U CN201920872336U CN210200294U CN 210200294 U CN210200294 U CN 210200294U CN 201920872336 U CN201920872336 U CN 201920872336U CN 210200294 U CN210200294 U CN 210200294U
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Abstract
The application discloses a driving circuit of a display panel and a display device, wherein the driving circuit comprises a connector connected to a normal display voltage and a voltage division module for dividing the voltage transmitted by the connector; a gamma module connected to the connector and generating a common voltage, the common voltage being directly supplied to the display panel through a common voltage line; an external power supply module for providing a simple lighting voltage for the display panel; the switching device is positioned on the common voltage line, one end of the switching device is connected with the gamma module, and the other end of the switching device transmits common voltage to the display panel through the common voltage line; this application inserts the voltage that external power supply module produced through auto-change over device, has realized that display panel's is simply lighted fast.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving circuit of a display panel and a display device.
Background
With the development and progress of science and technology, flat panel displays have become mainstream products of displays due to thin bodies, power saving, low radiation and other hot spots, and are widely used. The flat panel Display includes a thin film Transistor-Liquid Crystal Display (TFT-LCD), in which voltages required for driving the Liquid Crystal include a gate voltage, a data voltage, and a common voltage, the gate voltage functions to control the TFT to be turned on and off, and a voltage difference between the data voltage and the common voltage drives the Liquid Crystal to rotate. The data voltage and the common voltage are input into the display panel through the gamma chip, the data voltage is generally 7 groups of 14 voltage signals, each group of voltage and the common voltage form a positive voltage difference and a negative voltage difference, and then the liquid crystal is driven to deflect. The common voltage is directly input into the display panel by the gamma chip without being processed by other electronic devices.
All the voltages are supplied by an external power source and are transmitted to the display panel through the external wiring access connector. However, in the process of manufacturing a display panel or analyzing a problem, the display panel sometimes needs to be quickly and easily lighted, and the conventional jig or the complex lighting mode cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the application is to provide a driving circuit and a display device for supporting fast and simple lighting of a display panel.
The application provides a drive circuit, including: a connector connected to a normal display voltage; a gamma module connected to the connector and generating a common voltage, the common voltage being directly supplied to the display panel through a common voltage line; an external power supply module for providing a simple lighting voltage for the display panel; and a switching device on the common voltage line, one end of the switching device is connected with the gamma module, and the other end of the switching device transmits common voltage to the display panel through the common voltage line; when the display panel is normally lighted, the common voltage line is conducted, and the gamma module inputs a normal display voltage to the display panel through the switching device; when the display panel is simply lightened, the switching device is disconnected with the gamma module connecting end, and the external power supply module is connected with the switching device and provides simple lightening voltage for the display panel.
Optionally, the switching device is configured as a resistor, one end of the resistor is connected to the gamma module, and the other end of the resistor is connected to the display panel through the common voltage line; when the display panel is simply lightened, the resistor is disconnected with the gamma module connecting end, and the external power supply module is connected with the resistor and provides simple lightening voltage.
Optionally, the resistor is a zero ohm resistor.
Optionally, the switching device is configured as an active switch, wherein a control end and an input end of the active switch are connected to the gamma module, and the input end and the control end of the active switch are short-circuited; when the display panel is normally lightened, the active switch is turned on, and the gamma module directly inputs normal display voltage to the display panel; when the display panel is simply lightened, the input end of the active switch is disconnected with the gamma module, the external power supply module is connected with the input end of the active switch, and the simple lightening voltage is provided to the display panel.
Optionally, the switching device is configured as a diode, an anode of the diode is connected to the gamma module, and a cathode of the diode is connected to the display panel; when the display panel is normally lightened, the gamma module directly inputs a normal display voltage to the display panel; when the display panel is simply lightened, the anode of the diode is disconnected with the gamma module, and the external power supply module is connected with the cathode of the diode and provides simple lightening voltage to the display panel.
Optionally, the switching device is set as a contact, and the external power supply module is accessed through the contact.
Optionally, the switching device is provided with a first switch, and the first switch controls the connection or disconnection of the connection end of the switching device and the gamma module.
Optionally, the switching device includes a power interface, and when the display panel is simply lighted, the external power module provides a simple lighting voltage to the display panel through the power interface.
The application also discloses a driving circuit, including: a connector connected to a normal display voltage; a gamma module connected to the connector and generating a common voltage, the common voltage being directly supplied to the display panel through a common voltage line; an external power supply module for providing a simple lighting voltage for the display panel; the zero-ohm resistor is positioned on the common voltage wire, one end of the zero-ohm resistor is connected with the gamma module, and the other end of the zero-ohm resistor is connected with the display panel; when the display panel is normally lightened, the zero-ohm resistor is disconnected with the connecting end of the external power supply module or the external power supply module is connected with 0V voltage; when the display panel is simply lightened, the zero-ohm resistor is disconnected with the gamma module connecting end, the zero-ohm resistor is connected with the external power supply module connecting end, and voltage is supplied to the display panel through the external power supply module.
The application also discloses a display device which comprises a display panel and any one of the driving circuits.
The switching device is arranged on the common voltage line, and the switching device is controlled when the display panel works normally, so that the gamma module inputs normal display voltage to the display panel, and normal complex lighting of the display panel is not influenced; when the display panel is produced or the problem is resolved, the display panel needs to be quickly and simply lightened so as to be tested, the switching device is connected to external simple lightening voltage, and the display panel is quickly and simply lightened.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a driving circuit for normally lighting a display panel via a resistor according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a driving circuit for simply lighting up a display panel through resistors according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating a driving circuit for normally lighting a display panel by an active switch according to an embodiment of the present application;
FIG. 5 is a diagram of a driving circuit for simply lighting up a display panel by an active switch according to an embodiment of the present application;
FIG. 6 is a diagram of a driving circuit for normally lighting a display panel via a diode according to an embodiment of the present disclosure;
FIG. 7 is a diagram of a driving circuit for simply lighting up a display panel via a diode according to an embodiment of the present application;
FIG. 8 is an enlarged view of a gamma module region according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a disconnection point according to an embodiment of the present application.
100, a display panel; 200. a drive circuit; 210. a connector; 220. a voltage division module; 230. a gamma module; 240. an external power supply module; 250. a switching device; 251. a resistance; 252. an active switch; 253. a diode; 254. a first switch; 260. a common voltage line; 300. a display device.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present application. This application may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the term "multistage" means two or more stages unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two-stage element can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of the two-stage element. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The application is further described with reference to the drawings and alternative embodiments.
Referring to fig. 1 to 3, the present application discloses a display device 300 including a display panel 100 and a driving circuit 200. Wherein the driving circuit 200 includes: a connector 210 connected to a normal display voltage; a voltage dividing module 220 connected to the connector 210 and dividing the voltage transmitted by the connector 210; a gamma module 230 connected to the voltage dividing module 220 and directly supplying a common voltage to the display panel 100 through a common voltage line 260; an external power module 240 for providing a simple lighting voltage to the display panel 100; and a switching device 250 on the common voltage line 260, one end of which is connected to the gamma module 230 and the other end of which transmits a common voltage to the display panel 100 through the common voltage line 260. When the display panel 200 is normally lit, the common voltage line 260 is turned on, and the gamma module 230 inputs a normal display voltage to the display panel 100 through the switching device 250; when the display panel 100 is simply turned on, the connection terminal of the switching device 250 and the gamma module 230 is disconnected, and the external power module 240 is connected to the switching device 250 and provides a simple lighting voltage for the display panel 100.
In the production process of the display panel 100 or in the problem analysis, the display panel 100 needs to be quickly lighted for testing, but the lighting voltage input to the display panel 100 is too much when the display panel 100 normally displays, and the lighting process is complex, so that the normal testing requirements are difficult to meet. The external voltage required by the display panel 100 for normal display is input through the connector 210, the connector 210 divides the voltage through the voltage dividing module 220 to transmit the display voltage to the gamma module 230, the gamma module 230 processes a part of the display voltage and transmits the processed display voltage to the data chip, the data chip generates the 0-255 full gray scale voltage required by the display panel 100 for normal display, and the gamma module 230 simultaneously generates the common voltage (i.e., COM voltage) and directly inputs the common voltage (i.e., COM voltage) to the display panel 100 through the common voltage line 260. The present application provides the switching device 2250 on the common voltage line 230 connecting the gamma module 230 and the display panel 100, wherein one end of the switching device 250 is connected to the gamma module 230, and the other end is connected to the display panel 100. When the display panel 100 is normally lit, the switching device 250 is in a conducting state on the common voltage line 260, the gamma module 230 inputs a normal display voltage to the display panel 100, and at this time, the gamma module 230 is completely conducted with the common voltage line 260 in the display panel 100, so as to ensure normal display or lighting of the picture of the display panel 100; when simple lighting is needed, the connection end of the switching device 250 and the gamma module 230 is disconnected, and the other end of the switching device 250 is connected to the external power module 240, and the voltage for simple lighting is provided for the display panel 100 through the external power module 240. By arranging the switching device 250, the normal lighting of the display panel 100 can be ensured not to be influenced, and the display panel 100 can be simply and rapidly lighted.
Specifically, the switching device 250 is a resistor 251, one end of the resistor 251 is connected to the gamma module 230, and the other end of the resistor 251 is connected to the display panel through the common voltage line 260; when the display panel is simply lighted, the connection terminal between the resistor 251 and the gamma module 230 is disconnected, and the external power module 240 is connected to the resistor 251 and provides a simple lighting voltage. The gamma module 230 and the display panel are connected by connecting the resistor 251, welding points are arranged at two ends of the resistor 251, the common voltage line is disconnected before the resistor 251 is welded, and the simple lighting voltage can be directly connected to the welding point of the resistor 251 close to the display panel, so that the test can be performed in advance. After the test is passed, the resistor 251 is soldered in, and the normal use of the display panel 100 is not affected. The welding points at the two ends can quickly realize the on and off of the circuit. When the follow-up fault is found and needs to be detected again, the connection between the resistor 251 and the gamma module 230 needs to be disconnected, the welding point only needs to be broken through a soldering tool, and after the overhaul is completed, the resistor 251 can be welded again through the welding points at the two ends of the resistor 251, so that the overhaul is convenient for multiple times. Compared with other materials, the resistor 251 is more convenient to use when being externally connected with a power supply, is easy to operate and has lower cost. More specifically, the resistor 251 is a zero-ohm resistor, the zero-ohm resistor 251 is used without any influence on the driving circuit, and the zero-ohm resistor 251 does not influence the voltage during normal display.
Of course, the switching means 250 may also be an active switch 252. Referring to fig. 4 and 5, the switching device 250 is an active switch 252, wherein a control terminal and an input terminal of the active switch 252 are connected to the gamma module 230, and the input terminal and the control terminal of the active switch 252 are shorted; when the display panel is normally lighted, the active switch 252 is turned on, and the gamma module 230 directly inputs a normal display voltage to the display panel; when the display panel is simply turned on, the input terminal of the active switch 252 is disconnected from the gamma module 230, and the external power module 240 is connected to the input terminal of the active switch 252 to provide a simple turn-on voltage to the display panel. The input terminal and the control terminal of the active switch 252 are short-circuited, so that the input terminal and the output terminal of the active switch 252 are always kept in a conducting state no matter whether the display is simply turned on or is normally turned on. When the display panel is simply turned on, the connection between the input terminal of the active switch 252 and the gamma module 230 is disconnected, and the welding point at the disconnected position can be directly connected to the lead of the external power module 240 (the welding point is still disconnected from the gamma module 230), so as to input a simple turn-on voltage to the display panel. The active switch 252 can reduce the workload correspondingly, and only one welding point needs to be disconnected, so that circuit connection dislocation caused by excessive welding points can be prevented. The input terminal and the control terminal of the active switch 252 are both connected to the gamma module 230, and a pin connected to a voltage can be added to the gamma module 230 to the control terminal of the active switch 252, so that the active switch 252 is controlled to be closed through the control terminal and the output terminal.
Besides, the switching device 250 may also be a diode 253. Referring to fig. 6 and 7, the switching device 250 is a diode 253, an anode of the diode 253 is connected to the gamma module 230, and a cathode of the diode 253 is connected to the display panel; when the display panel is normally lit, the gamma module 230 directly inputs a normal display voltage to the display panel; when the display panel is simply turned on, the anode of the diode 253 is disconnected from the gamma module 230, and the external power module 240 is connected to the cathode of the diode 253 to provide a simple lighting voltage to the display panel. The diode 253 is used for disconnecting the anode of the diode 253 from the gamma module 230 and connecting the cathode of the diode 253 to the external power supply module 240. The input power of the display panel can be directly turned off, and only the cathode of the diode 253 is connected with a simple lighting voltage, and the diode 253 can prevent the current input by the cathode from flowing back to the anode due to the self-characteristic. When the simple lighting is completed, the diode 253 does not need to be removed, and one process is omitted.
The display panel can be directly connected with the external power supply module through the exposed contact, when the display panel is simply lightened, a circuit between the gamma module and the contact is disconnected, and meanwhile, the external power supply module is connected to the contact, so that simple lightening voltage is provided for the display panel. The design cost is lower, and other devices do not need to be additionally arranged.
Referring to fig. 8, the switching device 250 is provided with a first switch that controls the connection of the switching device 250 and the gamma module 230 to be turned on or off. When the display panel is normally displayed and lighted, the first switch is turned on, the common voltage line 260 keeps a conducting state, and at this time, the common voltage line 260 inputs the normal display voltage to the display panel; when simple lighting is required, the first switch is controlled to be closed, and at this time, the connection between the gamma module 230 and the switching device 250 is disconnected, and only the external power module 240 can deliver a simple lighting voltage to the display panel. The switching device shown in fig. 8 is a resistor, and when the switching device is an active switch, a diode, or the like, the first switch position structure is the same, and will not be described herein. There are other ways to control the connection terminals of the gamma module 230 and the switching device 250 to be opened or closed, which is not limited herein.
Specifically, the simple lighting voltage output by the external power module 240 is an adjustable voltage, and the adjustable voltage is between 0V and 6V. The adjustable voltage is suitable for various display panels and is adjusted according to the self requirement. The external power module 240 may be directly connected to the switching device 250 or may wait for connection as needed. The simple lighting voltage is set to 0V when the switching device 250 is directly involved, and the voltage is adjusted to a desired voltage when the simple lighting is required. The external power module 240 is not directly connected to the switching device 250, and can be connected only when needed to be simply turned on, so that the occupied circuit arrangement space inside the display panel is correspondingly reduced, and the narrow frame is facilitated to be realized.
When the display panel 100 is simply turned on, the connection between the common voltage line 260 and the display panel 100 needs to be disconnected, and the gamma module 230 does not input the normal display voltage to the display panel 100. Referring to fig. 9, the connection between the switching device 250 and the gamma module 230 may be directly disconnected, or the connector 210 and the circuit of the input power VDD may be disconnected as long as the connection between the gamma module 230 and the display panel 100 is disconnected. In all the embodiment drawings, "X" indicates where the connection is broken.
The technical scheme of the application can be widely applied to flat panel displays such as Thin film transistor-Liquid Crystal displays (TFT-LCDs) and Organic Light-Emitting diodes (OLED) displays.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the present application is not intended to be limited to the specific embodiments shown. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A driving circuit of a display panel, comprising:
the connector is connected to a normal display voltage;
a gamma module connected with the connector to generate a common voltage; the common voltage is directly transmitted to the display panel through a common voltage line;
the external power supply module is used for providing a simple lighting voltage for the display panel; and
the switching device is positioned on the common voltage line, one end of the switching device is connected with the gamma module, and the other end of the switching device transmits common voltage to the display panel through the common voltage line;
when the display panel is normally lighted, the common voltage line is conducted, and the gamma module inputs a normal display voltage to the display panel; when the display panel is simply lightened, the switching device is disconnected with the gamma module connecting end, and the external power supply module is connected with the switching device and provides simple lightening voltage for the display panel.
2. The driving circuit of a display panel according to claim 1, wherein the switching device is provided as a resistor, one end of the resistor is connected to the gamma module, and the other end of the resistor is connected to the display panel through the common voltage line;
when the display panel is simply lightened, the resistor is disconnected with the gamma module connecting end, and the external power supply module is connected with the resistor and provides simple lightening voltage.
3. The driving circuit for a display panel according to claim 2, wherein the resistance is a zero ohm resistance.
4. The driving circuit of claim 1, wherein the switching device is configured as an active switch, wherein a control terminal and an input terminal of the active switch are connected to the gamma module, and the input terminal and the control terminal of the active switch are shorted;
when the display panel is normally lightened, the active switch is turned on, and the gamma module directly inputs normal display voltage to the display panel; when the display panel is simply lightened, the input end of the active switch is disconnected with the gamma module, the external power supply module is connected with the input end of the active switch, and the simple lightening voltage is provided to the display panel.
5. The driving circuit of a display panel according to claim 1, wherein the switching device is provided as a diode, an anode of the diode is connected to the gamma module, and a cathode of the diode is connected to the display panel;
when the display panel is normally lightened, the gamma module directly inputs a normal display voltage to the display panel; when the display panel is simply lightened, the anode of the diode is disconnected with the gamma module, and the external power supply module is connected with the cathode of the diode and provides simple lightening voltage to the display panel.
6. The driving circuit of claim 1, wherein the switching device is configured as a contact through which the external power module is connected.
7. The driving circuit of a display panel according to claim 1, wherein the switching device is provided with a first switch, and the first switch controls on/off of a connection terminal of the switching device and the gamma module.
8. The driving circuit of claim 1, wherein the switching device comprises a power interface, and when the display panel is simply turned on, the external power module provides a simple lighting voltage to the display panel through the power interface.
9. A driving circuit of a display panel, comprising:
the connector is connected to a normal display voltage;
a gamma module connected with the connector to generate a common voltage; the common voltage is directly transmitted to the display panel through a common voltage line;
the external power supply module is used for providing a simple lighting voltage for the display panel; and
the zero-ohm resistor is positioned on the common voltage line, one end of the zero-ohm resistor is connected with the gamma module, and the other end of the zero-ohm resistor is connected with the display panel through the common voltage line;
when the display panel is normally lightened, the zero-ohm resistor is disconnected with the connecting end of the external power supply module or the external power supply module is connected with 0V voltage; when the display panel is simply lightened, the zero-ohm resistor is disconnected with the gamma module connecting end, the zero-ohm resistor is connected with the external power supply module connecting end, and voltage is supplied to the display panel through the external power supply module.
10. A display device comprising a display panel and a driver circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920872336.5U CN210200294U (en) | 2019-06-11 | 2019-06-11 | Display panel's drive circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920872336.5U CN210200294U (en) | 2019-06-11 | 2019-06-11 | Display panel's drive circuit and display device |
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| Publication Number | Publication Date |
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| CN210200294U true CN210200294U (en) | 2020-03-27 |
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| CN201920872336.5U Active CN210200294U (en) | 2019-06-11 | 2019-06-11 | Display panel's drive circuit and display device |
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