CN114937442B - Common voltage output circuit and display device - Google Patents
Common voltage output circuit and display device Download PDFInfo
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- CN114937442B CN114937442B CN202210592516.4A CN202210592516A CN114937442B CN 114937442 B CN114937442 B CN 114937442B CN 202210592516 A CN202210592516 A CN 202210592516A CN 114937442 B CN114937442 B CN 114937442B
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- 239000010408 film Substances 0.000 description 25
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- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
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- 230000001808 coupling effect Effects 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Crystallography & Structural Chemistry (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model provides a public voltage output circuit and display device, public voltage output circuit are used for providing a plurality of public voltages to display panel of display device, and public voltage output circuit includes public voltage input main channel, a plurality of public voltage output sub-channel and a plurality of unidirectional current module. The common voltage input main channel is used for receiving an initial voltage. The plurality of common voltage output sub-channels are electrically connected with the common voltage input main channel respectively. Each common voltage output sub-channel outputs a corresponding common voltage to the display panel based on the initial voltage received by the common voltage input main channel. The plurality of unidirectional conduction modules are in one-to-one correspondence with the plurality of public voltage output sub-channels, and the unidirectional conduction modules are used for realizing unidirectional conduction from the public voltage input main channel to the corresponding public voltage output sub-channel, so that each public voltage output sub-channel can be prevented from reversely transmitting power to the public voltage input main channel, and the problem of horizontal crosstalk can be solved.
Description
Technical Field
The application relates to the technical field of display, in particular to a public voltage output circuit and a display device.
Background
Currently, an LCD (Liquid Crystal Display ) is the most widely used display for various industries, and has advantages of thin profile, light weight, and the like. The LCD display panel mainly includes a backlight module, an array substrate (ThinFilmTransistorArray Substrate, TFT Array Substrate), a Color film substrate (Color FilterSubstrate, CFSubstrate), and a liquid crystal layer (Liquid Crystal Layer) disposed between the two substrates, wherein the array substrate is provided therein with a DATA line for transmitting a DATA voltage DATA, a pixel electrode for receiving the DATA voltage DATA, an array common electrode for receiving an array substrate common voltage a_com, and a light shielding electrode for receiving a light shielding common voltage dbs_com, wherein the light shielding electrode covers the DATA line. The color film substrate is provided with a color film common electrode for receiving the color film substrate common voltage CF_COM.
The LCD display panel works according to the following principle: applying a data voltage to a pixel electrode of the TFT substrate, and applying a public voltage to a color film public electrode of the CF substrate to control the rotation of liquid crystal molecules of the liquid crystal layer, and refracting light rays of the backlight module to generate a picture; meanwhile, the DBS_COM which is equal to the CF_COM is provided for the shading electrode, so that the liquid crystal molecules corresponding to the position of the shading electrode are kept in a non-deflected state, and the aim of shading the data line is fulfilled.
The power ICs (Integrated Circuit, integrated circuits) of most of the existing LCD display panels have only one common voltage output channel, and thus, a_com, cf_com, and dbs_com all come from the same common voltage output channel, i.e., the common voltage lines are shorted to each other and have the same potential. Since the coupling capacitance between the light shielding electrode and the DATA line is large, a transition of the DATA voltage DATA in the DATA line causes a variation in dbs_com, which causes a variation in cf_com, and thus causes a variation in brightness of the pixel unit, which is also called horizontal crosstalk (H-cross).
Disclosure of Invention
In view of this, the main purpose of the present application is to propose a common voltage output circuit and a display device, which aim to solve the problem of horizontal crosstalk caused by the mutual short circuit between the common voltage lines of the existing display panel.
To achieve the above object, the present application provides a common voltage output circuit for providing a plurality of common voltages to a display panel, the common voltage output circuit including a common voltage input main channel, a plurality of common voltage output sub-channels, and a plurality of unidirectional conductive modules. The common voltage input main channel is used for receiving an initial voltage. The plurality of common voltage output sub-channels are respectively and electrically connected with the common voltage input main channel, wherein each common voltage output sub-channel outputs corresponding common voltage to the display panel based on the initial voltage received by the common voltage input main channel. The unidirectional conduction modules are in one-to-one correspondence with the public voltage output sub-channels, are connected in series in the corresponding public voltage output sub-channels, and are used for realizing unidirectional conduction from the public voltage input main channel to the corresponding public voltage output sub-channels.
Optionally, each unidirectional conducting module includes a transistor, the control end and the first connection end of the transistor are electrically connected with the common voltage input main channel, and the second connection end of the transistor is electrically connected with the corresponding common voltage output sub-channel.
Optionally, each of the unidirectional conduction modules includes a transistor having a different channel width to length ratio.
Optionally, each unidirectional conduction module includes a diode, an anode of the diode is electrically connected with the common voltage input main channel, and a cathode of the diode is electrically connected with the corresponding common voltage output sub-channel.
Optionally, the common voltage output circuit further includes a plurality of voltage dividing modules, the plurality of voltage dividing modules are in one-to-one correspondence with the plurality of unidirectional conduction modules, each voltage dividing module and the corresponding unidirectional conduction module are connected in series in the corresponding common voltage output sub-channel, and the voltage dividing modules are used for dividing the initial voltage to obtain a corresponding common voltage.
Optionally, the voltage dividing module includes a first resistor and a second resistor, where the first resistor is connected in series in the corresponding common voltage output sub-channel and is electrically connected to the reference voltage terminal through the second resistor. The first resistor and the second resistor are used for dividing the initial voltage and outputting corresponding public voltage through a connecting node between the first resistor and the second resistor.
Optionally, the common voltage output circuit further includes a power module for generating and outputting the initial voltage.
According to the public voltage output circuit, the unidirectional conduction modules are respectively arranged in the public voltage output sub-channels, so that the public voltage output sub-channels can be prevented from reversely transmitting power to the public voltage input main channel, the public voltages output by the public voltage output sub-channels are kept isolated from each other, the public voltage of the color film substrate can be prevented from changing due to data voltage jump in the data line, the problem of horizontal crosstalk can be solved, and the public voltage output circuit is simple in structure.
The application also provides a display device, the display device comprises a display panel and the public voltage output circuit, wherein a plurality of public voltage output sub-channels included in the public voltage output circuit are respectively and electrically connected with the display panel.
Optionally, the display panel includes an array substrate and a color film substrate that are disposed opposite to each other, where the color film substrate includes a first common electrode, and the array substrate includes a second common electrode, a data line, and a light shielding electrode covering the data line. The plurality of public voltage output sub-channels comprise a first public voltage output sub-channel, a second public voltage output sub-channel and a third public voltage output sub-channel, and the first public voltage output sub-channel is electrically connected with a first public electrode on the color film substrate. The second common voltage output sub-channel is electrically connected with a second common electrode on the array substrate. The third common voltage output sub-channel is electrically connected with the shading electrode on the array substrate.
Optionally, the array substrate of the display panel further includes a common electrode line. The plurality of common voltage output sub-channels further comprise a fourth common voltage output sub-channel, and the fourth common voltage output sub-channel is electrically connected with the shared electrode line on the array substrate.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present application.
Fig. 2 is a schematic top view of the display device shown in fig. 1.
Fig. 3 is a partial structure diagram of a display panel of the display device shown in fig. 2.
Fig. 4 is another schematic top view of the display device shown in fig. 1.
The reference numerals are explained as follows:
Common voltage output circuit 100
COF 300
Non-display area 202
Pixel unit P
Common voltage input main channel 10
First common voltage output sub-channel 21
Second common voltage output sub-channel 22
Third common voltage output sub-channel 23
Fourth common voltage output sub-channel 24
Transistors T1, T2, T3, T4
Diodes D1, D2, D3, D4
Voltage dividing modules 41, 42, 43, 44
First resistors R11, R21, R31, R41
Second resistors R12, R22, R32, R42
First common electrode 221
Second common electrode 211
Shading electrode 212
Shared electrode line 213
The following detailed description will further illustrate the application in conjunction with the above-described figures.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, as shown in fig. 1, the present application provides a display device 1, where the display device 1 includes a display panel 200 and a backlight module 400. The backlight module 400 is configured to provide backlight light to the display panel 200. The display panel 200 includes an array substrate 210 and a color film substrate 220 disposed opposite to each other, and a liquid crystal layer 230 interposed between the array substrate 210 and the color film substrate 220, wherein a plurality of liquid crystal molecules 231 are disposed in the liquid crystal layer 230.
Referring to fig. 2, fig. 2 is a schematic top view of the display device 1 shown in fig. 1, and the display panel 200 includes a display area 201 and a non-display area 202 surrounding the display area 201. A plurality of data lines 215 extending along a column direction, a plurality of scan lines 216 extending along a row direction, and a plurality of pixel units P arranged in an array defined by the plurality of data lines 215 and the plurality of scan lines 216 are disposed in the display area 201.
Further, referring to fig. 3, fig. 3 is a schematic structural diagram of a single pixel unit P of the display panel 200 shown in fig. 2. The color film substrate 220 of the display panel 200 includes a transparent first common electrode 221. The array substrate 210 of the display panel 200 includes the plurality of data lines 215, the plurality of scan lines 216, the second common electrode 211, the light shielding electrode 212, the thin film transistor TFT, and the pixel electrode 214. Two adjacent data lines 215 and two adjacent scan lines 216 define a pixel unit P, each pixel unit P includes one pixel electrode 214 and one thin film transistor TFT, and the light shielding electrode 212 completely covers the data line 215. The gate electrode G of the thin film transistor TFT is electrically connected to the corresponding scan line 216 to receive a scan signal, the source electrode S of the thin film transistor TFT is electrically connected to the corresponding data line 215 to receive a data signal, and the drain electrode D of the thin film transistor TFT is electrically connected to the pixel electrode 214 to charge the pixel electrode 214 by accessing the data signal.
In operation, the first common electrode 221 is configured to receive the color film substrate common voltage cf_com, the second common electrode 211 is configured to receive the array substrate common voltage a_com, and the light shielding electrode 212 is configured to receive the light shielding common voltage dbs_com. In this embodiment, the common voltage cf_com of the color film substrate and the common voltage dbs_com of the light shielding film are equal in potential, so no electric field is formed in the liquid crystal layer 230 corresponding to the area where the light shielding electrode 212 is located, the liquid crystal molecules 231 therein remain in a non-deflected state, and the non-deflected liquid crystal molecules 231 herein mean that the area is in a dark state. Therefore, in the DBS (data BM less) technology, the light shielding electrode 212 can replace the black matrix to perform the light shielding function. Each of the data lines 215 is configured to receive a corresponding data signal, and each of the scan lines 216 is configured to receive a corresponding scan signal. For the pixel unit P, the thin film transistor TFT in the pixel unit P is turned on in response to the corresponding scanning signal, the pixel electrode 212 in the pixel unit P is charged to the DATA voltage DATA by receiving the corresponding DATA signal through the turned-on thin film transistor TFT, and the color film substrate common voltage cf_com and the DATA voltage DATA generate an electric field in the liquid crystal layer 230 corresponding to the pixel unit P, so as to control the liquid crystal molecules 231 in the liquid crystal layer 230 to rotate, and further refract the backlight light provided by the backlight module 400 to display a picture. The display brightness of the pixel unit P is in positive correlation with the electric field intensity in the corresponding liquid crystal layer 230, and thus, the display brightness of the pixel unit P can be controlled by controlling the difference between the color film substrate common voltage cf_com and the DATA voltage DATA (i.e., controlling the electric field intensity in the liquid crystal layer 230).
In this embodiment, in order to solve the color shift problem of the display panel under a large viewing angle, the display device 1 adopts the display panel 200 with an eight-domain pixel electrode structure, that is, the array substrate 210 of the display panel 200 is further provided with the common electrode line 213 for receiving the common voltage sb_com. Of course, in other embodiments, the display device 1 may also employ a display panel with other pixel electrode structures, and the array substrate 210 may not be provided with the common electrode line 213, which is not limited herein.
It should be noted that, since the power ICs of most conventional LCD display panels have only one common voltage output channel, the a_com, the cf_com, the sb_com and the dbs_com are all from the same common voltage output channel, i.e. the first common electrode 221, the second common electrode 211, the light shielding electrode 212 and the common electrode line 213 are shorted with each other and have the same potential. However, since the light shielding electrode 212 entirely covers the data line 215, a large vertical coupling capacitance exists between the light shielding electrode 212 and the data line 215. In addition, a lateral coupling capacitance is also present between the data line 215 and the adjacent second common electrode 211 and the common electrode line 213. Therefore, when the DATA voltage DATA in the DATA line 215 jumps, the coupling capacitance may cause the dbs_com, a_com, and sb_com to fluctuate, thereby causing the cf_com to fluctuate, and further causing the electric field intensity in the liquid crystal layer 230 corresponding to the pixel unit P to change, resulting in a deviation of the brightness of the pixel unit P, which is also called horizontal crosstalk.
Referring to fig. 2 again, in order to solve the problem of horizontal crosstalk in the conventional LCD display panel, the display device 1 provided in the present application is further provided with a common voltage output circuit 100, where the common voltage output circuit 100 is configured to provide a plurality of common voltages to the display panel 200, and the plurality of common voltages are isolated from each other.
In the embodiment of the present application, the common voltage output circuit 100 includes a power module 50, a common voltage input main channel 10, a plurality of common voltage output sub-channels, and a plurality of unidirectional conductive modules.
In the embodiment of the present application, the power module 50 is configured to generate and output an initial voltage Vcom, the common voltage input main channel 10 is electrically connected to the power module 50, and the common voltage input main channel 10 is configured to receive the initial voltage Vcom. A plurality of common voltage output sub-channels are electrically connected to the common voltage input main channel 10, respectively, wherein each of the common voltage output sub-channels outputs a corresponding common voltage to the display panel 200 based on the initial voltage Vcom received by the common voltage input main channel 10. Specifically, the plurality of common voltage output sub-channels includes a first common voltage output sub-channel 21, a second common voltage output sub-channel 22, a third common voltage output sub-channel 23, and a fourth common voltage output sub-channel 24. The first common voltage output sub-channel 21 is electrically connected to the first common electrode 221 on the color film substrate 220, and the first common voltage output sub-channel 21 is used for outputting the color film substrate common voltage cf_com. The second common voltage output sub-channel 22 is electrically connected to the second common electrode 211 on the array substrate 210, and the second common voltage output sub-channel 22 is used for outputting the array substrate common voltage a_com. The third common voltage output sub-channel 23 is electrically connected to the light shielding electrode 212 on the array substrate 210, and the third common voltage output sub-channel 23 is used for outputting the light shielding common voltage dbs_com. The fourth common voltage output sub-channel 24 is electrically connected to the common electrode line 213 of the array substrate 210, and the fourth common voltage output sub-channel 24 is used for outputting the common voltage sb_com. Illustratively, the display panel 200 further includes a control circuit board (not shown in fig. 2), and the power module 50 includes a power IC disposed on the control circuit board.
Further, the unidirectional conduction modules are in one-to-one correspondence with the plurality of common voltage output sub-channels, each unidirectional conduction module is connected in series in the corresponding common voltage output sub-channel, and each unidirectional conduction module is used for realizing unidirectional conduction from the common voltage input main channel 10 to the corresponding common voltage output sub-channel. Specifically, the unidirectional conduction modules include unidirectional conduction modules 31 to 34, taking the unidirectional conduction module 33 as an example, the unidirectional conduction module 33 is disposed in the third common voltage output sub-channel 23, and the unidirectional conduction module 33 is configured to implement unidirectional conduction from the common voltage input main channel 10 to the third common voltage output sub-channel 23. Thus, when the DATA voltage DATA in the DATA line 215 jumps, the shielding common voltage dbs_com on the shielding electrode 212 will vary due to the coupling effect of the vertical coupling capacitor, but the unidirectional conduction module 33 can prevent the third common voltage output sub-channel 23 from sending voltage back to the common voltage input main channel 10, that is, prevent the color film substrate common voltage cf_com from varying due to the coupling effect of the vertical coupling capacitor, so that the color film substrate common voltage cf_com and the shielding common voltage dbs_com are kept isolated, and further the problem of horizontal crosstalk can be solved. The circuit structure of other unidirectional conduction modules is similar to the working principle, and the description is omitted.
According to the public voltage output circuit 100, the unidirectional conduction modules are respectively arranged in the public voltage output sub-channels, so that the public voltage output sub-channels can be prevented from reversely transmitting power to the public voltage input main channel, the public voltages output by the public voltage output sub-channels are kept isolated from each other, the color film substrate public voltage CF_COM can be prevented from changing due to the jump of the DATA voltage DATA in the DATA line 215, the problem of horizontal crosstalk can be solved, and the public voltage output circuit is simple in structure.
In this embodiment, each of the unidirectional conduction modules includes a transistor, where a control terminal (i.e., the gate g) and a first connection terminal (i.e., the drain d) of the transistor are electrically connected to the common voltage input main channel 10, and a second connection terminal (i.e., the source s) of the transistor is electrically connected to the corresponding common voltage output sub-channel. Specifically, the unidirectional conduction module 31 includes a transistor T1, the unidirectional conduction module 32 includes a transistor T2, the unidirectional conduction module 33 includes a transistor T3, and the unidirectional conduction module 34 includes a transistor T4. Taking the transistor T1 as an example, the transistor T1 is a high-level on transistor, such as an NMOS transistor. Since the gate and the drain of the transistor T1 are electrically connected, the transistor T1 has a characteristic corresponding to forward conduction of the diode at this time according to the operation characteristic of the transistor, and since the drain and the gate are connected, vds > Vgs-Vth is necessarily present, that is, it always operates in the saturation region. The transistors T1 to T4 may be amorphous silicon thin film transistors (a-Si TFTs), low temperature polysilicon thin film transistors (LTPS TFTs), or Oxide semiconductor thin film transistors (Oxide TFTs), for example. Among them, an active layer of the Oxide semiconductor thin film transistor employs an Oxide semiconductor (Oxide), such as indium gallium zinc Oxide (Indium Gallium Zinc Oxide, IGZO). In the present embodiment, the transistors T1 to T4 are disposed in the non-display area 202 of the display panel 200. Illustratively, the transistors T1 to T4 may be formed in the same process as the thin film transistors TFT in the display panel 200, so that the manufacturing process may be simplified and the cost may be reduced. The common voltage input main channel 10 includes traces extending from the power module 50 to respective transistors, and respective common voltage output sub-channels are provided in the display panel 200. Of course, in other embodiments, the transistors T1 to T4 may be disposed On a Chip On Film (COF) in the display panel 200 or On the control circuit board, which is not limited herein.
It should be noted that, the on-resistance of the transistor is inversely related to the channel width-to-length ratio thereof, that is, the larger the channel width-to-length ratio of the transistor is, the smaller the on-resistance thereof is, and the lower the on-voltage drop is. In the embodiment of the present application, the transistors T1 to T4 may be transistors having the same channel width to length ratio, or may be transistors having different channel width to length ratios. When transistors having different channel width-to-length ratios are used, the transistors T1 to T4 have different on-voltage drops, so that the voltage values of the common voltages output by the respective common voltage output sub-channels are not equal, i.e., a_com, cf_com, sb_com, and dbs_com are not equal. Therefore, different voltage requirements can be met, and the applicability is wider.
Referring to fig. 4, fig. 4 is another schematic top view of the display device 1 shown in fig. 1. The pixel driving circuit 100 shown in fig. 4 is similar to the circuit structure of the display device 1 shown in fig. 2, except that: the unidirectional conduction module shown in fig. 4 uses a diode instead of a transistor, and the common voltage output circuit 100 further includes a plurality of voltage division modules, where the voltage division modules are in one-to-one correspondence with the unidirectional conduction modules, each voltage division module is serially connected with a corresponding unidirectional conduction module in a corresponding common voltage output sub-channel, and the voltage division modules are used for dividing the initial voltage Vcom to obtain a corresponding common voltage.
Wherein, the positive pole of the diode is electrically connected with the public voltage input main channel 10, and the negative pole of the diode is electrically connected with the corresponding public voltage output sub-channel. Specifically, the unidirectional conduction module 31 includes a diode D1, the unidirectional conduction module 32 includes a diode D2, the unidirectional conduction module 33 includes a diode D3, and the unidirectional conduction module 34 includes a diode D4. Taking the diode D1 as an example, the anode of the diode D1 is electrically connected to the common voltage input main channel 10, and the cathode of the diode D1 is electrically connected to the first common voltage output sub-channel 21. The diode D1 may prevent the first common voltage output sub-channel 21 from feeding back power to the common voltage input main channel 10. It will be appreciated that the diodes D1-D4 may be such that a_com, cf_com, sb_com, dbs_com remain isolated from each other and do not affect each other.
Further, the voltage dividing module includes a first resistor and a second resistor, wherein the first resistor is connected in series in the corresponding common voltage output sub-channel and is electrically connected to a reference voltage terminal (e.g., a ground terminal GND) through the second resistor. The first resistor and the second resistor are used for dividing the initial voltage Vcom, and a corresponding common voltage is output through a connection node between the first resistor and the second resistor. Specifically, the voltage dividing modules include voltage dividing modules 41 to 44, taking the voltage dividing module 41 as an example, the voltage dividing module 41 includes a first resistor R11 and a second resistor R12, where the first resistor R11 is connected in series between the common voltage input main channel 10 and the positive electrode of the diode D1, and the first resistor R11 is electrically connected with the ground terminal GND through the second resistor R12.
In operation, the following relationship exists between the array substrate common voltage a_com and the initial voltage Vcom:
A_COM＝Vcom×R12/(R11+R12)
it can be understood that different array substrate common voltages a_com can be obtained by adjusting the resistance values of the first resistor R11 and/or the second resistor R12, where the first resistor R11 and/or the second resistor R12 are variable resistors. The circuit structure and the working principle of other voltage dividing modules are similar, and the description is omitted. Therefore, the voltage value of the public voltage output by each public voltage output sub-channel can be flexibly adjusted, and the applicability is wider. Of course, in other embodiments, the positions of the unidirectional conduction module and the corresponding voltage division module may be interchanged, that is, the unidirectional conduction module is disposed between the common voltage input main channel 10 and the corresponding voltage division module, and the voltage division module may further include a sliding rheostat, a DC-DC transformer, etc., which is not limited herein.
In this embodiment, the plurality of voltage dividing modules and the plurality of unidirectional conducting modules are all disposed on the flip-chip film 300 of the display device 1, the common voltage input main channel 10 includes wires extending from the power module 50 to the respective voltage dividing modules, and the respective common voltage output sub-channels include wires extending from the respective unidirectional conducting modules to the display panel 200. In other embodiments, the voltage dividing modules and the unidirectional conducting modules may be disposed on the control circuit board, which is not limited herein.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A common voltage output circuit for supplying a plurality of common voltages to a display panel, the common voltage output circuit comprising:
the public voltage input main channel is used for receiving an initial voltage;
the public voltage output sub-channels are respectively and electrically connected with the public voltage input main channel, wherein each public voltage output sub-channel outputs corresponding public voltage to the display panel based on the initial voltage received by the public voltage input main channel; the color film substrate comprises a plurality of common voltage output sub-channels, a color film substrate and a color film substrate, wherein the plurality of common voltage output sub-channels at least comprise a first common voltage output sub-channel for outputting common voltage of the color film substrate, a second common voltage output sub-channel for outputting common voltage of the array substrate and a third common voltage output sub-channel for outputting shading common voltage; and
and the unidirectional conduction modules are in one-to-one correspondence with the plurality of public voltage output sub-channels, are connected in series in the corresponding public voltage output sub-channels, and are used for realizing unidirectional conduction from the public voltage input main channel to the corresponding public voltage output sub-channels.
2. The common voltage output circuit of claim 1 wherein each of said unidirectional-on modules comprises a transistor, a control terminal and a first connection terminal of said transistor being electrically connected to said common voltage input main channel, and a second connection terminal of said transistor being electrically connected to a corresponding common voltage output sub-channel.
3. The common voltage output circuit of claim 2 wherein each of said unidirectional-on modules includes transistors having different channel width to length ratios.
4. The common voltage output circuit of claim 1 wherein each of said unidirectional conduction modules comprises a diode having an anode electrically connected to said common voltage input main channel and a cathode electrically connected to a corresponding common voltage output sub-channel.
5. The common voltage output circuit of claim 4 further comprising a plurality of voltage dividing modules in one-to-one correspondence with the plurality of unidirectional conducting modules, each voltage dividing module being connected in series with a respective unidirectional conducting module in a respective common voltage output sub-channel, the voltage dividing modules being configured to divide the initial voltage to obtain a corresponding common voltage.
6. The common voltage output circuit of claim 5 wherein the voltage divider module comprises a first resistor and a second resistor, wherein the first resistor is connected in series in the respective common voltage output sub-channel and is electrically connected to a reference voltage terminal through the second resistor;
the first resistor and the second resistor are used for dividing the initial voltage and outputting corresponding public voltage through a connecting node between the first resistor and the second resistor.
7. The common voltage output circuit according to any one of claims 1 to 6, further comprising a power supply module for generating and outputting the initial voltage.
8. A display device, comprising:
a display panel; and
the common voltage output circuit of any one of claims 1 to 7, wherein the common voltage output circuit comprises a plurality of common voltage output sub-channels electrically connected to the display panel, respectively.
9. The display device of claim 8, wherein the display panel comprises an array substrate and a color film substrate disposed opposite to each other, the color film substrate comprising a first common electrode, the array substrate comprising a second common electrode, a data line, and a light shielding electrode covering the data line;
the plurality of common voltage output sub-channels includes:
the first public voltage output sub-channel is electrically connected with a first public electrode on the color film substrate;
the second public voltage output sub-channel is electrically connected with a second public electrode on the array substrate; and
and the third public voltage output sub-channel is electrically connected with the shading electrode on the array substrate.
10. The display device according to claim 9, wherein the array substrate of the display panel further includes a common electrode line; the plurality of common voltage output sub-channels further comprise a fourth common voltage output sub-channel, and the fourth common voltage output sub-channel is electrically connected with the shared electrode line on the array substrate.
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| JP3593457B2 (en) * | 1998-05-27 | 2004-11-24 | 日本特殊陶業株式会社 | Sensor for ignition secondary circuit of internal combustion engine, ignition / combustion detection device, and preignition detection device |
| CN102487076A (en) * | 2010-12-03 | 2012-06-06 | 比亚迪股份有限公司 | Cell structure of MOS (Metal Oxide Semiconductor) power device |
| JP6361096B2 (en) * | 2013-07-31 | 2018-07-25 | 日亜化学工業株式会社 | Display device |
| CN104576361B (en) * | 2013-10-23 | 2017-09-22 | 无锡华润上华半导体有限公司 | The preparation method of power diode |
| CN107329339B (en) * | 2017-08-14 | 2020-04-07 | 深圳市华星光电技术有限公司 | Array substrate and curved surface liquid crystal display |
| CN107479291B (en) * | 2017-09-28 | 2020-04-07 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and manufacturing method thereof |
| CN107942587B (en) * | 2017-11-20 | 2020-10-30 | 深圳市华星光电半导体显示技术有限公司 | Alignment method of liquid crystal display panel |
| CN108983517A (en) * | 2018-07-17 | 2018-12-11 | 深圳市华星光电技术有限公司 | Pixel circuit and liquid crystal display panel |
| CN215006303U (en) * | 2021-04-02 | 2021-12-03 | 西安军陶科技有限公司 | Power output enables control circuit |
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