CN209374040U - Common voltage switching circuit and display device - Google Patents
Common voltage switching circuit and display device Download PDFInfo
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- CN209374040U CN209374040U CN201920229065.1U CN201920229065U CN209374040U CN 209374040 U CN209374040 U CN 209374040U CN 201920229065 U CN201920229065 U CN 201920229065U CN 209374040 U CN209374040 U CN 209374040U
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- common voltage
- switch
- switch element
- display device
- viewing angle
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Abstract
The utility model discloses a kind of common voltage switching circuits, it include: the first common voltage selecting module, first common voltage selecting module includes first switching element, the control terminal of first switching element is used for input viewing angle switching signal, and the input terminal of first switching element is for inputting the first supply voltage；Second common voltage selecting module, second common voltage selecting module includes second switch element and third switch element, the control terminal of second switch element is used for input viewing angle switching signal, the input end grounding of second switch element, the output end of second switch element is connect with the control terminal of third switch element, the input terminal of third switch element is connected for inputting the second supply voltage, and the output end of third switch element and first switching element connects and is used for outputting common voltage.The invention also discloses a kind of display device, including common voltage switching circuit as described above, display device can switch between wide viewing angle and narrow viewing angle according to view angle switch signal.
Description
Technical field
The utility model relates to technical field of liquid crystal display, fill more particularly to a kind of common voltage switching circuit and display
It sets.
Background technique
Since liquid crystal display device has many advantages, such as frivolous, energy saving, radiationless, it is now widely used for TV, a
People's computer, tablet computer, PDA (Personal Digital Assistant, personal digital assistant), mobile phone, digital camera etc.
In electronic equipment.
Visual angle (HVA, the Hybrid Viewing Angle) type of mixing is that a kind of liquid crystal of processing is improved on the basis of IPS type
Display device.Mixing visual angle (HVA) type liquid crystal display device is by increasing electricity in the color membrane substrates side (CF, Color Filter)
Come control liquid crystal layer liquid crystal molecule rotation, to realize that the image of high quality is shown.Mix visual angle (HVA) type liquid crystal display
Device be divided into wide viewing angle (Wide Viewing Angle, WVA) display pattern and narrow viewing angle (Narrow Viewing Angle,
NVA) display pattern.
For large-sized liquid crystal display, public electrode can be generated hair by the interference of data line in face and scan line in face
Voltage (being similar to the voltage of an exchange) is pierced, leading to the virtual voltage in face on public electrode is not DC voltage, therefore big
The switching panel of size all can compensate in advance common voltage (Vcom), and this method is suitable for general liquid crystal display.
But this do the method that compensates in advance to common voltage (Vcom) to current newest mixing visual angle (HVA) type not
It is applicable in, because mixing visual angle (HVA) type will do it the switching at width visual angle.This do in advance to common voltage (Vcom) compensates
Method can be applicable in wide viewing angle (WVA) display, but infeasible in narrow viewing angle (NVA) display.It is special because of narrow viewing angle (NVA)
Design, the waveform of the common voltage (Vcom) needed is different from custom liquid crystals display screen, if also in narrow viewing angle (NVA) display
Common voltage (Vcom) is compensated, will affect the image quality of liquid crystal display, in some instances it may even be possible to can cause to show that picture is abnormal, cause
Customer complaint.
Utility model content
In order to overcome shortcoming and defect existing in the prior art, the purpose of this utility model is to provide a kind of common electricals
Press switching circuit and display device, with solve in existing mixing visual angle technology common voltage cannot with the switching at width visual angle and
Change, the problem for causing to show picture exception.
The purpose of this utility model is achieved through the following technical solutions:
The utility model provides a kind of common voltage switching circuit, comprising:
First common voltage selecting module, which includes first switching element, this first is opened
The control terminal for closing element is connect with view angle switch signal generator module, the input terminal of the first switching element and the first supply voltage
Generation module connection；
Second common voltage selecting module, the second common voltage selecting module include second switch element and third switch
Element, the control terminal of the second switch element are connect with the view angle switch signal generator module, the input of the second switch element
End ground connection, the output end of the second switch element connect with the control terminal of the third switch element, the third switch element it is defeated
Enter end to connect with the second supply voltage generation module, the output end of the third switch element and the output end of the first switching element
Connection.
Further, which further includes first resistor, one end of the first resistor and this
The output end of one switch element connects, the other end ground connection of the first resistor.
Further, which further includes second resistance and 3rd resistor, the second resistance
One end is connect with the control terminal of the third switch element, and the input terminal of the other end of the second resistance and the third switch element connects
It connects, one end of the 3rd resistor is connect with the output end of the third switch element, the other end ground connection of the 3rd resistor.
Further, the first switching element, the second switch element and the third switch element are metal oxide layer
Semiconductcor field effect transistor.
Further, the first switching element and the third switch element are p-type metal-oxide half field effect transistor, this second
Switch element is N-type metal-oxide half field effect transistor.
Further, the control terminal of the first switching element, the second switch element and the third switch element be grid,
Input terminal is source electrode, output end is drain electrode.
Further, the first supply voltage and second supply voltage of the first supply voltage generation module output generate
One of second supply voltage of module output is the alternating voltage compensated with common voltage, and another is without common electrical
Press the DC voltage of compensation.
The utility model also provides a kind of display device, which includes common voltage switching electricity as described above
Road.
Further, which is equipped with view angle switch key, for producing the view angle switch signal for user's operation
Raw module generates view angle switch signal.
Further, which further includes display panel and driving circuit, the display panel include first substrate, with
The second substrate that the first substrate is oppositely arranged and the liquid crystal layer between the first substrate and the second substrate, this first
Substrate is equipped with viewing angle control electrode on the side towards the liquid crystal layer, which sets on the side towards the liquid crystal layer
There are public electrode and pixel electrode, which, which is used to apply different voltages to the viewing angle control electrode, makes the display device exist
Switch between wide viewing angle and narrow viewing angle.
The utility model beneficial effect is: selecting mould by the way that the first common voltage is arranged in common voltage switching circuit
Block and the second common voltage selecting module, wherein the first common voltage selecting module includes first switching element, first switch member
The control terminal of part is connect with view angle switch signal generator module, and the input terminal of first switching element and the first supply voltage generate mould
Block connection；Second common voltage selecting module includes second switch element and third switch element, the control of second switch element
End connect with view angle switch signal generator module, the input end grounding of second switch element, the output end of second switch element and
The control terminal of third switch element connects, and the input terminal of third switch element is connect with the second supply voltage generation module, third
The output end of switch element and the output end of first switching element connect and are used for outputting common voltage.Common voltage switching electricity
Road is under the action of view angle switch signal, one of the first common voltage selecting module and the second common voltage selecting module
It is in the conductive state, it is another, it is in an off state, exports the first supply voltage and the second supply voltage alternatively as public
Common voltage changes common voltage by view angle switch signal.
Detailed description of the invention
Fig. 1 is the modular structure schematic diagram of common voltage switching circuit in the utility model；
Fig. 2 is the electrical block diagram of common voltage switching circuit in the utility model；
Fig. 3 is the analog waveform figure of common voltage switching circuit in the utility model；
Fig. 4 is structural schematic diagram of the display panel in wide viewing angle in the utility model；
Fig. 5 is structural schematic diagram of the display panel in narrow viewing angle in the utility model；
Fig. 6 is one of the planar structure schematic diagram of display device in the utility model；
Fig. 7 is two of the planar structure schematic diagram of display device in the utility model.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to according to the utility model proposes common voltage switching circuit and display device tool
Body embodiment, structure, feature and its effect, detailed description are as follows:
Fig. 1 is the modular structure schematic diagram of common voltage switching circuit in the utility model；Fig. 2 is public in the utility model
The electrical block diagram of common voltage switching circuit；Fig. 3 is the waveform knot that common voltage switching circuit is simulated in the utility model
Structure schematic diagram；Fig. 4 is structural schematic diagram of the display panel in wide viewing angle in the utility model；Fig. 5 is shown in the utility model
Show structural schematic diagram of the panel in narrow viewing angle；Fig. 6 is one of the planar structure schematic diagram of display device in the utility model；Figure
7 be two of the planar structure schematic diagram of display device in the utility model.
It please refers to shown in Fig. 1 and Fig. 2, a kind of common voltage switching circuit provided by the utility model can be cut for visual angle
In the display device changed, wherein display device can switch between wide viewing angle and narrow viewing angle according to view angle switch signal HVA, public
Voltage commutation circuit includes:
First common voltage selecting module 1, the first common voltage selecting module 1 include first switching element M1, and first opens
The control terminal for closing element M1 connect with view angle switch signal generator module 3 and for input viewing angle switching signal HVA, first switch
The input terminal of element M1 connect with the first supply voltage generation module 4 and for inputting the first supply voltage V1；
Second common voltage selecting module 2, the second common voltage selecting module 2 include that second switch element M2 and third are opened
Element M3 is closed, the control terminal of second switch element M2 connect with view angle switch signal generator module 3 and switches for input viewing angle
Signal HVA, the input end grounding of second switch element M2, the control of the output end and third switch element M3 of second switch element M2
End connection processed, the input terminal of third switch element M3 connect with the second supply voltage generation module 5 and for inputting the second power supply
The output end of voltage V2, third switch element M3 connect with the output end of first switching element M1 and are used for outputting common voltage
Vcom；
Wherein, view angle switch signal generator module 3 can export corresponding view angle switch signal HVA depending on the user's operation,
First supply voltage generation module 4 routinely exports the first supply voltage V1, and the second supply voltage generation module 5 is routinely
Export the second supply voltage V2.The common voltage switching circuit is under the action of view angle switch signal HVA, the choosing of the first common voltage
It is in the conductive state to select one of module 1 and the second common voltage selecting module 2, it is another, it is in an off state, makes
One supply voltage V1 and the second supply voltage V2 is alternatively exported as common voltage Vcom.
In the present embodiment, first switching element M1, second switch element M2 and third switch element M3 are metal oxygen
Change layer semiconductcor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor,
MOSFET, metal-oxide half field effect transistor).In the present embodiment, first switching element M1 and third switch element M3 are p-type gold oxygen
Half field effect transistor (PMOS), second switch element M2 are N-type metal-oxide half field effect transistor (NMOS).First switching element M1,
The control terminal of second switch element M2 and third switch element M3 are grid, input terminal is source electrode, output end is drain electrode.
In the present embodiment, the first common voltage selecting module 1 further includes first resistor R1, one end of first resistor R1 with
The output end of first switching element M1 connects, the other end ground connection of first resistor R1；Second common voltage selecting module 2 further includes
One end of second resistance R2 and 3rd resistor R3, second resistance R2 are connect with the control terminal of third switch element M3, second resistance
The other end of R2 is connect with the input terminal of third switch element M3, one end of 3rd resistor R3 and the output of third switch element M3
End connection, the other end ground connection of 3rd resistor R3.
In the present embodiment, it under the action of view angle switch signal HVA, is led when the first common voltage selecting module 1 is in
Logical state, when the second common voltage selecting module 2 is in an off state, the first supply voltage V1 output is used as common voltage
Vcom；When the second common voltage selecting module 2 is in the conductive state, when the first common voltage selecting module 1 is in an off state,
Second supply voltage V2 output is used as common voltage Vcom.
Shown in referring to figure 3., wherein the view angle switch signal HVA that view angle switch signal generator module 3 exports is with height
Low level voltage, the first supply voltage V1 and the second supply voltage generation module 5 of the output of the first supply voltage generation module 4
One of second supply voltage V2 of output is the alternating voltage compensated with common voltage, and another is without common voltage
The DC voltage of compensation.In the present embodiment, view angle switch signal HVA is narrow viewing angle signal at high level (for example, 3.3V), low
Level (for example, 0V) is wide viewing angle signal, the second supply voltage V2 be compensate without common voltage DC voltage (such as
For 5V), the first supply voltage V1 is that the alternating voltage that compensate with common voltage is (upper and lower for example, centered on 5V DC voltage
The alternating voltage of fluctuation).When view angle switch signal HVA is low level, first switching element M1 conducting, second switch element M2
It is disconnected with third switch element M3, the first supply voltage V1 of output is as common voltage Vcom, when view angle switch signal HVA is height
When level, first switching element M1 is disconnected, and second switch element M2 is connected with third switch element M3, exports the second supply voltage
V2 is as common voltage Vcom.It is understood that in other embodiments, view angle switch signal HVA can be set in high level
For wide viewing angle signal, low level can be set to narrow viewing angle signal, then at this point, the first supply voltage V1 is to mend without common voltage
The DC voltage (for example, 5V) repaid, the second supply voltage V2 are the alternating voltage that compensates with common voltage (for example, with 5V
The alternating voltage fluctuated up and down centered on DC voltage).
Referring to figure 4. shown in-Fig. 7, the utility model also provides a kind of display device, including common voltage as described above
Switching circuit, display device are equipped with view angle switch key 40, for generating view angle switch signal generator module 3 for user's operation
View angle switch signal HVA.In the present embodiment, display device further includes display panel 30 and driving circuit 50, and display panel 30 wraps
Include first substrate 31, the second substrate 32 being oppositely arranged with first substrate 31 and be located at first substrate 31 and the second substrate 32 it
Between liquid crystal layer 33, first substrate 31 is equipped with viewing angle control electrode 311 on the side towards liquid crystal layer 33, and the second substrate 32 exists
It is equipped with public electrode 321 and pixel electrode 323 towards the side of liquid crystal layer 33, public electrode 321 and pixel electrode 323 are located at
Different layers are simultaneously kept apart by insulating layer 322, and driving circuit 50, which is used to apply different voltages to viewing angle control electrode 311, to be made to show
Device switches between wide viewing angle and narrow viewing angle.
Wherein, first substrate 31 be color membrane substrates, first substrate 31 on the side towards liquid crystal layer 33 be equipped with red (R),
The color blocking material layer and black matrix (BM) of green (G), blue (B) three color, the second substrate 32 are array substrate, and the second substrate 32 is in court
The multi-strip scanning line and multiple data lines of mutually insulated intersection are additionally provided on the side of liquid crystal layer 33, by multi-strip scanning line and more
Data line, which intersects to limit, forms multiple pixel units, and pixel electrode 323 and thin film transistor (TFT) are equipped in each pixel unit, as
Plain electrode 323 is connect by thin film transistor (TFT) with the scan line of adjacent films transistor and data line, the liquid crystal in liquid crystal layer 33
Molecule is positive liquid crystal molecules.As for the other structures of display panel, refer to the prior art, and which is not described herein again.
Fig. 6 and Fig. 7 is the planar structure schematic diagram of display device in the utility model, please join Fig. 6 and Fig. 7, display dress
View angle switch key 40 is installed, for issuing view angle switch request to the liquid crystal display device for user.View angle switch key
40 can be physical button (as shown in Figure 6), or software control or application program (APP) Lai Shixian handoff functionality
(as shown in fig. 7, width visual angle is set by slider bar).It, can when user needs to switch between wide viewing angle and narrow viewing angle
To be requested by operation view angle switch key 40 to liquid crystal display device sending view angle switch and generate view angle switch signal
Module 3 generates view angle switch signal HVA, is finally applied to viewing angle control electrode 311 and public electrode by the control of driving circuit 50
Voltage on 321, to control the voltage difference between viewing angle control electrode 311 and public electrode 321, which can be real
Switching between existing wide viewing angle and narrow viewing angle, when being switched to wide viewing angle, driving method uses the corresponding driving side of wide angle mode
Method, when being switched to narrow viewing angle, driving method uses the corresponding driving method of narrow viewing angle mode, therefore the utility model embodiment
Display device have stronger operating flexibility and convenience, reach integrate entertainment video maintain secrecy with privacy it is multi-functional
Liquid crystal display device.
Referring to figure 2. and shown in Fig. 3, specifically, when being switched to wide viewing angle, view angle switch signal HVA output is low electricity
Flat, first switching element M1 conducting, second switch element M2 and third switch element M3 are disconnected, and the first supply voltage V1 of output makees
For common voltage Vcom, at this point, the first supply voltage V1 is the alternating voltage compensated with common voltage, thus aobvious to wide viewing angle
Common voltage when showing compensates, and does not apply driving voltage on viewing angle control electrode 311 or applies and common voltage Vcom phase
As voltage, keep the pressure difference formed between viewing angle control electrode 311 and public electrode 321 smaller (for example, 0.5V), at this time liquid
Brilliant molecule is in lying status (Fig. 4)；(such as being switched at the t1 moment), view angle switch signal when being switched to narrow viewing angle
HVA output is high level, and first switching element M1 is disconnected, and second switch element M2 is connected with third switch element M3, exports the
Two supply voltage V2 are as common voltage Vcom, at this point, the second supply voltage V2 is the direct current compensated without common voltage
Pressure applies larger voltage on viewing angle control electrode 311, makes visual angle to realize the uncompensation of common voltage when narrow viewing angle is shown
The pressure difference formed between coordination electrode 311 and public electrode 321 is larger (for example, 3V), and liquid crystal molecule is in heeling condition at this time
(Fig. 5) generates light leakage in big view.At the t2 moment, user is switched to wide viewing angle by view angle switch key 40, this
When, common voltage Vcom is the alternating voltage compensated with common voltage.
Herein, the nouns of locality such as related up, down, left, right, before and after be located in figure with the structure in attached drawing with
And structure mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the side
The use of position word should not limit the claimed range of the application.
The above descriptions are merely preferred embodiments of the present invention, not does in any form to the utility model
Restriction be not intended to limit the utility model although the utility model has been disclosed with preferred embodiment as above, it is any ripe
Professional and technical personnel is known, is not being departed within the scope of technical solutions of the utility model, when in the technology using the disclosure above
Appearance makes a little change or modification, is the equivalent embodiment of equivalent variations, but all without departing from technical solutions of the utility model
Hold, any simple modification, equivalent change and modification made by the above technical examples according to the technical essence of the present invention, still
Belong within the protection scope of technical solutions of the utility model.
Claims (10)
1. a kind of common voltage switching circuit characterized by comprising
First common voltage selecting module (1), the first common voltage selecting module (1) include first switching element (M1), should
The control terminal of first switching element (M1) is connect with view angle switch signal generator module (3), the first switching element (M1) it is defeated
Enter end to connect with the first supply voltage generation module (4)；
Second common voltage selecting module (2), the second common voltage selecting module (2) include second switch element (M2) and
Three switch elements (M3), the control terminal of the second switch element (M2) are connect with the view angle switch signal generator module (3), this
The input end grounding of two switch elements (M2), the control of the output end of the second switch element (M2) and the third switch element (M3)
End connection processed, the input terminal of the third switch element (M3) are connect with the second supply voltage generation module (5), third switch member
The output end of part (M3) is connect with the output end of the first switching element (M1).
2. common voltage switching circuit according to claim 1, which is characterized in that the first common voltage selecting module
It (1) further include first resistor (R1), one end of the first resistor (R1) is connect with the output end of the first switching element (M1), should
The other end of first resistor (R1) is grounded.
3. common voltage switching circuit according to claim 2, which is characterized in that the second common voltage selecting module
It (2) further include second resistance (R2) and 3rd resistor (R3), one end of the second resistance (R2) and the third switch element (M3)
Control terminal connection, the other end of the second resistance (R2) connect with the input terminal of the third switch element (M3), and the third is electric
One end of resistance (R3) is connect with the output end of the third switch element (M3), the other end ground connection of the 3rd resistor (R3).
4. common voltage switching circuit according to claim 1, which is characterized in that the first switching element (M1), this
Two switch elements (M2) and the third switch element (M3) are metal oxide layer semiconductor field-effect transistor.
5. common voltage switching circuit according to claim 4, which is characterized in that the first switching element (M1) and this
Three switch elements (M3) are p-type metal-oxide half field effect transistor, which is N-type OH crystal
Pipe.
6. common voltage switching circuit according to claim 1, which is characterized in that the first switching element (M1), this
The control terminal of two switch elements (M2) and the third switch element (M3) is grid, input terminal is source electrode, output end is drain electrode.
7. common voltage switching circuit according to claim 1, which is characterized in that the first supply voltage generation module
(4) export the first supply voltage (V1) and the second supply voltage generation module (5) output the second supply voltage (V2) its
One of for the alternating voltage that is compensated with common voltage, another DC voltage to be compensated without common voltage.
8. a kind of display device, which is characterized in that the display device includes such as the described in any item common voltages of claim 1-7
Switching circuit.
9. display device according to claim 8, which is characterized in that the display device is equipped with view angle switch key (40),
For making the view angle switch signal generator module (3) generate view angle switch signal (HVA) for user's operation.
10. display device according to claim 9, which is characterized in that the display device further include display panel (30) and
Driving circuit (50), the display panel (30) include the second base that first substrate (31) and the first substrate (31) are oppositely arranged
Plate (32) and the liquid crystal layer (33) between the first substrate (31) and the second substrate (32), the first substrate (31) exist
Viewing angle control electrode (311) are equipped with towards the side of the liquid crystal layer (33), the second substrate (32) is towards the liquid crystal layer
(33) side is equipped with public electrode (321) and pixel electrode (323), which is used for viewing angle control electricity
Pole (311), which applies different voltages, switches the display device between wide viewing angle and narrow viewing angle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229065.1U CN209374040U (en) | 2019-02-22 | 2019-02-22 | Common voltage switching circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229065.1U CN209374040U (en) | 2019-02-22 | 2019-02-22 | Common voltage switching circuit and display device |
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| CN209374040U true CN209374040U (en) | 2019-09-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110675796A (en) * | 2019-09-25 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit, display device and viewing angle control method |
| CN111640404A (en) * | 2020-06-10 | 2020-09-08 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
| CN112382248A (en) * | 2020-11-06 | 2021-02-19 | 昆山龙腾光电股份有限公司 | Drive circuit and display device |
| CN113380207A (en) * | 2021-05-31 | 2021-09-10 | 北海惠科光电技术有限公司 | Display panel driving method and display device |
-
2019
- 2019-02-22 CN CN201920229065.1U patent/CN209374040U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110675796A (en) * | 2019-09-25 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit, display device and viewing angle control method |
| CN111640404A (en) * | 2020-06-10 | 2020-09-08 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
| CN112382248A (en) * | 2020-11-06 | 2021-02-19 | 昆山龙腾光电股份有限公司 | Drive circuit and display device |
| CN113380207A (en) * | 2021-05-31 | 2021-09-10 | 北海惠科光电技术有限公司 | Display panel driving method and display device |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |
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