CN114283757A - Drive circuit and display device - Google Patents
Drive circuit and display device Download PDFInfo
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- CN114283757A CN114283757A CN202111643590.6A CN202111643590A CN114283757A CN 114283757 A CN114283757 A CN 114283757A CN 202111643590 A CN202111643590 A CN 202111643590A CN 114283757 A CN114283757 A CN 114283757A
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Abstract
The application discloses a driving circuit and a display device, which are applied to the display device, wherein the driving circuit comprises a plurality of data signal wires, a pixel electrode, a charge elimination circuit, a piezoresistor and a control circuit; the data signal wires are electrically connected with the plurality of pixel electrodes, the piezoresistor comprises a first end and a second end, the first end is connected with at least one data signal wire, the second end is connected with the charge elimination circuit, and the piezoresistor is provided with a threshold voltage; the control circuit is used for outputting a voltage signal which is larger than or equal to the threshold voltage to the voltage dependent resistor; when the display device is shut down, the control circuit outputs a voltage signal to the piezoresistor, the resistance value of the piezoresistor is reduced to be smaller than 10 omega, the data signal wiring and the charge eliminating circuit are conducted, the data signal wiring and the charge eliminating circuit are connected to discharge, the piezoresistor is arranged, charges existing on the pixel electrode are eliminated when the display device is shut down, and the phenomenon of shutdown ghost shadow of the display panel is avoided.
Description
Technical Field
The present application relates to the field of display panels, and in particular, to a driving circuit and a display device.
Background
Display panel is in normal work, can accumulate a certain amount of electric charge on the pixel electrode in the display panel, when shutting down, the gate line is opened, the pixel electrode can carry out the backward discharge through the data line, but the speed of pixel electrode backward discharge is slower, can not obtain fast the elimination because of the electric charge of pixel electrode, lead to there being certain pressure differential between pixel electrode and the common electrode, thereby make the liquid crystal molecule can have the deflection phenomenon when shutting down, and then, the phenomenon of shutdown ghost can appear on the display panel, display panel's display effect has been influenced, cause to watch the not good impression of experience to the user.
Disclosure of Invention
The application aims to provide a driving circuit and a display device, and charges existing on a pixel electrode are eliminated when a display panel is shut down by arranging a piezoresistor, so that the phenomenon of shutdown ghost shadow of the display panel is avoided.
The application discloses a driving circuit, which is applied to a display device and comprises a pixel electrode, a plurality of data signal wires, a charge elimination circuit, a piezoresistor and a control circuit, wherein the data signal wires are electrically connected with the plurality of pixel electrodes; the control circuit is used for outputting a voltage signal which is larger than or equal to the threshold voltage to the voltage dependent resistor; when the display device is shut down, the control circuit outputs a voltage signal to the piezoresistor, the resistance value of the piezoresistor is reduced to be less than 10 omega, the data signal wiring is conducted with the charge elimination circuit, and the data signal wiring is connected with the charge elimination circuit for discharging.
Optionally, the display device includes a display panel, a printed circuit board and a chip on film, one end of the chip on film is connected to the display panel, the other end of the chip on film is connected to the printed circuit board, a plurality of source driving wires are arranged on the chip on film, the number of the source driving wires is the same as the number of the data signal wires, one source driving wire is correspondingly connected to one data signal wire in the display panel, two piezoresistors are arranged, and the two piezoresistors are respectively connected to the two source driving wires at the outermost side.
Optionally, the charge cancellation circuit includes a common electrode, and the second end of the voltage dependent resistor is connected to the common electrode through a wire.
Optionally, the charge eliminating circuit includes a ground terminal on the printed circuit board, and the second terminal of the voltage dependent resistor is connected to the ground terminal on the printed circuit board through a wire.
Optionally, the threshold voltage of the voltage dependent resistor is V1, and the voltage of the data signal output by the chip on film to the data line is V2, where V1 is greater than or equal to V2+2, and 15V is greater than V1 and greater than 10V.
Optionally, the data signal routing includes a data line, a first fan-out routing and a second fan-out routing, the first fan-out routing is located on one side of the display panel close to the flip chip, the second fan-out routing is located on one end of the display panel far away from the flip chip, the data line is connected with the first fan-out routing and the second fan-out routing, the first end of the piezoresistor is connected with the second fan-out routing, and the second end of the piezoresistor is connected with the charge elimination circuit.
Optionally, the number of the piezoresistors is the same as that of the second fan-out wires, and the first ends of the piezoresistors are connected with the second fan-out wires in a one-to-one correspondence manner.
Optionally, the second fan-out trace is divided into N partitions, and there are N piezoresistors, where each piezoresistor is connected to one second fan-out trace located in the middle of each partition.
Optionally, the data signal trace includes a first fan-out trace, the charge cancellation circuit includes a common line, and the piezoresistor is directly laid between the first fan-out trace and the common line.
The application also discloses a display device which comprises the driving circuit.
This application adopts piezo-resistor in order to connect data signal walk the line with charge elimination circuit, thereby make data signal walks the line and connects pixel electrode can pass through when shutting down data signal walk the line with piezo-resistor with charge elimination circuit connects, eliminates remaining electric charge on the pixel electrode when shutting down, has improved pixel electrode and common electrode appear the voltage difference when shutting down and lead to display device can appear the problem of shutdown ghost in the shutdown in-process, improve display device's display effect.
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 circuit diagram of a driving circuit of a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a driving circuit of a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a driving circuit of a third embodiment of the present application;
fig. 4 is a schematic structural diagram of a driving circuit of a fourth embodiment of the present application;
fig. 5 is a schematic structural diagram of a driving circuit of a fourth embodiment of the present application;
fig. 6 is a schematic structural diagram of a display device according to a fifth embodiment of the present application.
100, a driving circuit; 200. a voltage dependent resistor; 300. a charge eliminating circuit; 310. a common line; 400. a control circuit; 500. data signal routing; 510. a first fan-out trace; 520. a second fan-out trace; 600. a chip on film; 610. source electrode driving wiring; 700. a printed circuit board; 800. a display panel; 900. a display device.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may 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, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application will now be described in detail with reference to the drawings and alternative embodiments, it being understood that any combination of the various embodiments or technical features described below may form new embodiments without conflict.
As shown in fig. 1, as a first embodiment of the present application, a driving circuit is disclosed, which is applied to a display device, the driving circuit includes a pixel electrode, a plurality of data signal traces 500, a charge elimination circuit 300, a voltage dependent resistor 200 and a control circuit 400, the data signal traces 500 are connected to the plurality of pixel electrodes, the voltage dependent resistor 200 includes a first end and a second end, the first end is connected to at least one of the data signal traces 500, the second end is connected to the charge elimination circuit 300, the voltage dependent resistor 200 has a threshold voltage, the control circuit 400 is configured to output a voltage signal greater than or equal to the threshold voltage to the voltage dependent resistor 200, when the display device is powered off, the control circuit outputs a voltage signal to the voltage dependent resistor 200, the resistance of the voltage dependent resistor is reduced to less than 10 Ω and the data signal 500 is conducted to the charge elimination circuit 300, the data signal trace 500 and the charge eliminating circuit 300 are connected to discharge, in this embodiment, the varistor 200 may be a zinc oxide varistor, a strontium titanate varistor, or a rare earth oxide varistor, and a user may select which kind of varistor 200 to use according to an actual situation.
When the display device is powered off, the control circuit 400 detects that the display device is in a power-off state, the control circuit 400 outputs a voltage signal to the piezoresistor 200, the piezoresistor 200 receives the voltage signal output by the control circuit 400, when the voltage signal reaches the threshold voltage of the piezoresistor 200, the resistance value of the piezoresistor 200 is reduced to less than 10 Ω, the data signal routing 500 and the charge eliminating circuit 300 are turned on, the charges accumulated on the pixel electrode can be output to the charge eliminating circuit 300 through the data signal routing 500 to eliminate the charges, so that the voltage difference between the pixel electrode and the common electrode is eliminated, and the problem of power-off afterimage of the display device in the power-off process due to the voltage difference between the pixel electrode and the common electrode in the power-off state is solved, the display effect of the display device is improved;
in this embodiment, the control circuit 400 may be integrated into a Power IC (Power integrated circuit), and since the Power IC may control the on/off of the display panel 800, when the Power IC of the display device is powered off, the control circuit 400 outputs a voltage signal to control the resistance of the voltage-sensitive resistor 200 to be reduced to 0 Ω, when the Power IC of the display device is powered on, the control circuit 400 is turned off, and only after the voltage signal output by the control circuit 400 is greater than the threshold voltage of the voltage-sensitive resistor 200, the voltage-sensitive resistor 200 is turned on, the resistance of the voltage-sensitive resistor 200 becomes 0 Ω, and when the voltage signal output by the control circuit 400 is less than the threshold voltage of the voltage-sensitive resistor 200, the resistance of the voltage-sensitive resistor 200 is infinite, wherein the threshold voltage of the voltage-sensitive resistor 200 is V1, the voltage of the data signal output by the chip on film 600 to the data signal trace 500 is V2, v1 is greater than or equal to V2+2,15V is greater than V1 is greater than 10V, that is, the voltage of the maximum data signal output by the data signal trace 500 is at least 2V less than the threshold voltage of the varistor 200, so as to avoid that the data signal voltage output to the data signal trace 500 erroneously turns on the varistor 200 to cause poor display effect of the display device and affect the viewing experience of a user when the display device is normally used;
in this application, adopt piezo-resistor 200 in order to connect data signal walk line 500 with charge elimination circuit 300, thereby make data signal walk line 500 and connect the pixel electrode can pass through when shutting down data signal walk line 500 with piezo-resistor 200 with charge elimination circuit 300 connects, eliminates remaining electric charge on the pixel electrode when shutting down, improves display device and in the shutdown process because of there being the voltage difference between pixel electrode and the common electrode and the problem of shutdown ghost appears, improves display device's display effect.
The charge eliminating circuit 300 includes a common electrode, and the second terminal of the voltage dependent resistor 200 is connected to the common electrode through a conducting wire, specifically, the printed circuit board 700 is connected to the common electrode through a common voltage output trace, the common voltage is outputted to the common electrode through the chip on film 600, so that, when the piezoresistor 200 is disposed on the chip on film 600 or the printed circuit board 700, can be connected to the common electrode through the common voltage output trace, when the voltage signal output by the control circuit 400 reaches the threshold voltage of the varistor 200 when the device is turned off, the data signal trace 500 is connected to the common voltage output trace, the pixel electrode is communicated with the common electrode, so that the voltage difference between the pixel electrode and the common electrode is eliminated, and the problem of shutdown ghost shadow caused by the voltage difference between the pixel electrode and the common electrode when the display device is shut down is solved;
in this embodiment, the charge eliminating circuit 300 may also be a ground terminal on the printed circuit board 700, the second terminal of the varistor 200 is connected to the ground terminal of the pcb 700 through a wire, and when the device is turned off, the voltage signal output by the control circuit 400 reaches the threshold voltage of the varistor 200, the resistance of the varistor 200 is reduced to less than 10 Ω, the data signal trace 500 is connected to the ground terminal of the pcb 700, so that the charges accumulated in the pixel electrode can be grounded through the ground terminal on the printed circuit board 700, therefore, the electric charge of the pixel electrode is eliminated, the problem of shutdown afterimage of the display device caused by the voltage difference between the pixel electrode and the common electrode is solved, and a user can select whether the second end of the piezoresistor 200 is connected with the common electrode or the grounding end on the printed circuit board 700 according to actual conditions to eliminate the electric charge remained in the pixel electrode.
As shown in fig. 2, as a second embodiment of the present application, which is a further improvement of the first embodiment, the display device includes a display panel 800, a printed circuit board 700 and a chip on film 600, one end of the chip on film 600 is connected to the display panel 800, the other end is connected to the printed circuit board 700, a plurality of source driving traces 610 are disposed on the chip on film 600, the number of the source driving traces 610 is the same as the number of the data signal traces 500, one source driving trace 610 is correspondingly connected to one data signal trace 500 in the display panel 800, two piezoresistors 200 are disposed, the first ends of the two piezoresistors 200 are respectively connected to the two source driving traces 610 at the outermost side, the second ends of the two piezoresistors 200 are connected to a common voltage output trace on the printed circuit board 700 through a wire, or the second ends of the two piezoresistors 200 are connected to the grounding end on the printed circuit board 700 through a wire;
compared with the arrangement of the piezoresistor 200 on the display panel 800, the piezoresistor 200 can be arranged on the chip on film 600 or the printed circuit board 700, so that the light transmittance of the display panel 800 is not affected when the display panel 800 is normally used, and the space of the display panel 800 is not occupied, which is beneficial to the design of a narrow frame of a display device, and the two piezoresistors 200 are respectively arranged on the two wires at the outermost side of the source electrode driving wires 610;
because the common display panel 800 needs to perform ground discharge on the data signal traces 500, when the display panel is turned off, the gates of all Thin Film Transistors (TFTs) are all turned on to facilitate discharge, when the resistance of the piezoresistor 200 is reduced to less than 10 Ω, the outermost source driving trace 610 is conducted with the charge cancellation circuit 300, when the pixel electrode connected to the outermost source driving trace 610 starts to perform charge cancellation, through the potential difference coupling effect, the adjacent source driving trace 610 also performs charge release cancellation through the outermost source driving trace 610, so that the subsequent other source driving traces 610 can also perform charge release cancellation, only two piezoresistors 200 need to be arranged on the flip chip film 600 or the printed circuit board 700, which is also convenient for manufacturing a display device, and meanwhile, the piezoresistors 200 do not need to occupy the space of the display panel 800, the design of the narrow frame of the display device is facilitated;
in this embodiment, one of the source driving traces 610 on the chip on film 600 may also be provided with a voltage dependent resistor 200, a first end of the voltage dependent resistor 200 is connected to one of the source driving traces 610, a second end of the voltage dependent resistor 200 is connected to the charge cancellation circuit 300, when the resistance of the voltage dependent resistor 200 is reduced to 0 Ω, the outermost source driving trace 610 and the middle source driving trace 610 are both connected to the charge cancellation circuit 300, and after the source driving trace 610 starts to perform charge cancellation, through a potential difference coupling effect, the adjacent source driving trace 610 performs charge cancellation through the outermost source driving trace 610 and the middle source driving trace 610, so that the other source driving traces 610 may also perform charge cancellation, thereby increasing the speed of charge cancellation of the pixel electrode.
As shown in fig. 3, as a third embodiment of the present application, different from the second embodiment, the data signal trace 500 includes a data line, a first fan-out trace 510 and a second fan-out trace 520, the first fan-out trace 510 is located on a side of the display panel 800 close to the flip-chip film 600, the second fan-out trace 520 is located on an end of the display panel 800 away from the flip-chip film 600, the data line is connected to the first fan-out trace 510 and the second fan-out trace 520, a first end of the varistor 200 is connected to the second fan-out trace 520, a second end of the varistor 200 is connected to the charge cancellation circuit, in this embodiment, the second end of the varistor 200 is connected to the common electrode, and the second end of the varistor 200 may be connected to the common electrode in two ways, the second end of the piezoresistor 200 can be connected to a common electrode on the color film substrate through a gold ball or a conductive BPS; the second way is that the second end of the varistor 200 is connected to the common line 310 on the array substrate by punching on the array substrate, and then connected to the common electrode communicated with the common line 310, and the specific connection mode between the varistor 200 and the common electrode is designed and connected by a designer according to practical situations, wherein, in this embodiment, the varistor 200 is disposed in the non-display area of the display panel 800, so as to avoid the influence of the varistor 200 on the light transmittance of the display panel 800 during the normal use of the display device.
In addition, in the third embodiment of the present application, the number of the piezoresistors 200 is the same as that of the second fan-out traces 520, and the first ends of the piezoresistors 200 are connected to the second fan-out traces 520 in a one-to-one correspondence manner, so that each pixel electrode can be short-circuited with the common electrode through the piezoresistors 200 when the display device is turned off, thereby eliminating the voltage difference between the pixel electrode and the common electrode, and the number of the piezoresistors 200 is the same as that of the data signal traces 500, and the piezoresistors are arranged in a one-to-one correspondence manner, so that when the display device is turned off, the speed of eliminating the charges remaining in the pixel electrode is high, the phenomenon of shutdown ghost cannot occur, and the display effect is good;
in this embodiment, the plurality of second fan-out traces 520 may also be divided into N partitions, the piezoresistors 200 are provided with N corresponding numbers, each piezoresistor 200 is respectively connected to one second fan-out trace 520 located in the middle of each partition, when a pixel electrode connected to one second fan-out trace 520 in the middle starts to perform charge elimination, through a potential difference coupling effect, other second fan-out traces 520 adjacent to the one second fan-out trace 520 in the middle also perform charge elimination through the second fan-out trace 520 in the middle, and so on, the subsequent second fan-out traces 520 may also perform charge release elimination, thereby performing charge elimination on the whole partition, so that the number of the piezoresistors 200 to be installed does not need to be set too many, and the designer selects the number of the piezoresistors 200 according to actual conditions, and the second fan-out routing 520 is divided into different regions for charge elimination, so that the speed of eliminating charges by the pixel electrode is high when the display panel is turned off, the phenomenon of shutdown ghost is avoided, and meanwhile, too many piezoresistors 200 are not required to be arranged to occupy the space of the display panel 800, wherein N is more than or equal to 2, and N is less than the number of the second fan-out routing 520.
Of course, the above method of dividing the second fan-out trace 520 into N partitions to set the number of the piezoresistors 200 to discharge the pixel electrode may also be applied to the source driving trace 610.
As shown in fig. 4 and 5, as a fourth embodiment of the present application, a driving circuit is disclosed, where the data signal trace 500 includes a first fan-out trace 510, the first fan-out trace 510 is located on a side of the display panel 800 close to the flip-chip film 600, the charge cancellation circuit 300 includes a common line 310, and the piezoresistor 200 is directly laid between the first fan-out trace 510 and the common line 310, as shown in fig. 5;
when the display device is used, the control circuit 400 outputs a voltage signal to the voltage dependent resistor 200, when the voltage signal reaches the threshold voltage, the resistance value of the voltage dependent resistor 200 is reduced to be less than 10 Ω, the first fan-out routing 510 is communicated with the common line 310, so that the pixel electrode connected with the first fan-out routing 510 can discharge through the common line 310, charges on the pixel electrode are eliminated, the problem of shutdown ghost caused by voltage difference between the pixel electrode and the common electrode in the shutdown process of the display device is solved, and the display effect of the display device is improved.
As shown in fig. 6, as a fifth embodiment of the present application, a display device is disclosed, and the display device 900 includes the driving circuit 100 as described in the above embodiments.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. 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 applied to a display device, the driving circuit comprising:
a pixel electrode;
the data signal routing lines are electrically connected with the pixel electrodes;
a charge eliminating circuit;
the voltage dependent resistor comprises a first end and a second end, the first end is connected with at least one data signal wire, the second end is connected with the charge elimination circuit, and the voltage dependent resistor is provided with a threshold voltage; and
the control circuit is used for outputting a voltage signal which is greater than or equal to the threshold voltage to the voltage dependent resistor;
when the display device is shut down, the control circuit outputs the voltage signal to the piezoresistor, the resistance value of the piezoresistor is reduced to be less than 10 omega, the data signal wiring is conducted with the charge elimination circuit, and the data signal wiring is connected with the charge elimination circuit to discharge.
2. The driving circuit according to claim 1, wherein the display device includes a display panel, a printed circuit board, and a chip on film, one end of the chip on film is connected to the display panel, and the other end of the chip on film is connected to the printed circuit board, a plurality of source driving traces are disposed on the chip on film, the number of the source driving traces is the same as the number of the data signal traces, and one source driving trace is correspondingly connected to one data signal trace in the display panel;
the number of the piezoresistors is two, and the two piezoresistors are respectively connected to the two source electrode driving wires at the outermost side.
3. The driving circuit of claim 1, wherein the charge cancellation circuit comprises a common electrode, and the second terminal of the voltage dependent resistor is connected to the common electrode through a conductive line.
4. The driving circuit of claim 1, wherein the charge cancellation circuit comprises a ground terminal on the printed circuit board, and the second terminal of the voltage dependent resistor is connected to the ground terminal on the printed circuit board through a wire.
5. The driving circuit of claim 1, wherein the threshold voltage of the voltage dependent resistor is V1, and the voltage of the data signal outputted from the COF to the data line is V2, wherein V1 is not less than V2+2, and 15V is more than V1 and more than 10V.
6. The driving circuit according to claim 2, wherein the data signal traces include data lines, a first fan-out trace and a second fan-out trace, the first fan-out trace is located on a side of the display panel close to the flip chip, the second fan-out trace is located on an end of the display panel away from the flip chip, the data lines are connected to the first fan-out trace and the second fan-out trace, a first end of the piezoresistor is connected to the second fan-out trace, and a second end of the piezoresistor is connected to the charge cancellation circuit.
7. The driving circuit according to claim 6, wherein the number of the piezoresistors is the same as the number of the second fan-out traces, and the first ends of the piezoresistors are connected with the second fan-out traces in a one-to-one correspondence.
8. The driving circuit according to claim 6, wherein the second fan-out trace divides into N partitions, and the piezoresistors are provided in N;
wherein each piezoresistor is respectively connected to one second fan-out line positioned in the middle in each subarea.
9. The driving circuit of claim 1, wherein the data signal trace comprises a first fan-out trace, wherein the charge cancellation circuit comprises a common line, and wherein the piezoresistor is laid directly between the first fan-out trace and the common line.
10. A display device, characterized in that the display device comprises:
a driver circuit as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114879396A (en) * | 2022-05-23 | 2022-08-09 | 惠科股份有限公司 | Pixel driving structure, preparation method and display panel |
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