CN103578434B - Display device and common voltage circuit module thereof - Google Patents
Display device and common voltage circuit module thereof Download PDFInfo
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- CN103578434B CN103578434B CN201210259590.0A CN201210259590A CN103578434B CN 103578434 B CN103578434 B CN 103578434B CN 201210259590 A CN201210259590 A CN 201210259590A CN 103578434 B CN103578434 B CN 103578434B
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Abstract
The invention provides a kind of display device and common voltage circuit module thereof, this common voltage circuit module comprises power end, earth terminal, common voltage end, the first resistive element, the second resistive element and variable resistor element.First resistive element couples common voltage end and earth terminal.Second resistive element couples power end and uses voltage end together, and to be formed by power end through the second resistive element and the first resistive element to the first electric current carrying pathway of earth terminal.First end and second end of variable resistor element couple power end and earth terminal respectively, form the second electric current carrying pathway.A point pressure side for variable resistor element couples common voltage end, optionally to adjust the resistance value between resistance value between power end in the second electric current carrying pathway to point pressure side and point pressure side to earth terminal.
Description
Technical field
The present invention relates to a kind of common voltage circuit module, and particularly relate to a kind of common voltage circuit module for display device.
Background technology
In recent years along with the fast development of photoelectric technology and semiconductor technology, drive the universal use of flat display apparatus.In numerous flat display apparatus, liquid crystal display, owing to having the advantageous characteristic such as space availability ratio highly, low consumpting power, zero radiation and low EMI, thus becomes the main flow in market.
Before liquid crystal display shipment, testing staff needs the variable resistance by coupling the common voltage circuit module of display module in adjustment liquid crystal display, guarantee in the voltage level range that the voltage level (voltagelevel, voltage level) that common voltage circuit module exports can normally can work at a section.
Please refer to Fig. 1, Fig. 1 illustrates the circuit diagram according to known common voltage circuit module.As shown in Figure 1, known common voltage circuit module 9 has power end GMA, earth terminal GND and common voltage end VCOM tri-end points respectively, and comprises resistive element 91,92 and variable resistor element 93.Wherein, resistive element 91 couples the first end 93a of variable resistor element 93, and the second end 93b then coupling resistance element 92 of its variable resistor element 93, the control end 93c of variable resistor element 93 is then coupled to common voltage end VCOM.In addition, between the first end 93a of resistive element 91 and variable resistor element 93, there is a wire and extend and be connected to common voltage end VCOM.
Common voltage end VCOM couples the display module (not shown in Fig. 1) of liquid crystal display, makes display module can produce display frame by receiving voltage level that common voltage end VCOM export.
When normal trace routine, testing staff by the control end 93c of adjustment variable resistor element 93, the voltage level making common voltage end VCOM export a display module according to this can normally to work.
But, in the process of transporting or detect, if collide or human factor causes coming off of variable resistor element 93 or its control end 93c to rupture time, the voltage level that the common voltage end VCOM of known common voltage circuit module 9 is exported equals the voltage level that power end GMA can provide.
Thus, namely the voltage level that display module is received by common voltage end VCOM equals the voltage level that power end GMA can provide, and except may causing display frame intense flashes, also may cause the damage of display module.In addition, the Gamma voltage affecting liquid crystal display that the voltage of power end GMA can be related, cause the instability of liquid crystal display and power dissipation larger.
Summary of the invention
The invention reside in and a kind of common voltage circuit module is provided, by the setting of resistive element, make when variable resistor element come off or its point of pressure side suspension joint time, common voltage circuit module still by with pre-designed resistive element, makes common voltage end export a voltage level that display device can normally be worked according to this.
The embodiment of the present invention provides a kind of common voltage circuit module, common voltage circuit module has power end respectively, earth terminal uses voltage end together for this, and this common voltage circuit module also comprises the first resistive element, the second resistive element and variable resistor element.First resistive element is coupled between common voltage end and earth terminal.Second resistive element is coupled to power end and uses together between voltage end.By the first resistive element and the second resistive element, to be formed by power end through the second resistive element and the first resistive element to the first electric current carrying pathway of earth terminal.Variable resistor element has first end, the second end and point pressure side, and first end and the second end couple power end and earth terminal respectively.By variable resistor element, to be formed by power end through variable resistor element to the second electric current carrying pathway of earth terminal.Point pressure side couples common voltage end, optionally to adjust the resistance value between resistance value between power end in the second electric current carrying pathway to point pressure side and point pressure side to earth terminal.Wherein, common voltage circuit module exports a common voltage level from common voltage end.
The invention reside in and a kind of display device is provided, by the setting of resistive element, the variable resistor element of the common voltage circuit module in display device is come off or its point of pressure side suspension joint time, common voltage circuit module still by with pre-designed resistive element, makes common voltage end export a voltage level that display device can normally be worked according to this.
The embodiment of the present invention provides a kind of display device, comprises common voltage circuit module and display module.Common voltage circuit module has power end respectively, earth terminal uses voltage end together, and this common voltage circuit module also comprises the first resistive element, the second resistive element and variable resistor element.First resistive element is coupled between common voltage end and earth terminal.Second resistive element is coupled to power end and uses together between voltage end.By the first resistive element and the second resistive element, to be formed by power end through the second resistive element and the first resistive element to the first electric current carrying pathway of earth terminal.Variable resistor element has first end, the second end and point pressure side, and first end and the second end couple power end and earth terminal respectively.By variable resistor element, to be formed by power end through variable resistor element to the second electric current carrying pathway of earth terminal.Point pressure side couples common voltage end, optionally to adjust the resistance value between resistance value between power end in the second electric current carrying pathway to point pressure side and point pressure side to earth terminal.Wherein, common voltage circuit module exports a common voltage level from common voltage end.Display module couples common voltage end, and by receiving common voltage level, produces display frame according to this.
In sum, the embodiment of the present invention provides a kind of common voltage circuit module for display device, by the setting of the first resistive element, make the variable resistor element in common voltage circuit module because be subject to external force factor, and cause variable resistor element to come off or its point of pressure side suspension joint time, common voltage circuit module still by with the first pre-designed resistive element, makes common voltage end export a voltage level that display device can normally be worked according to this.In addition, the common voltage circuit module of the embodiment of the present invention is by means of only simple circuit design, variable resistor element can be avoided to come off or the situation that the circuit of the intense flashes that point pressure side of variable resistor element produces for display device during suspension joint or its display module damages, except adding the practicality in practical application, also improve display device make efficiency and yield, and reduce power attenuation.
Further understand feature of the present invention and technology contents for enable, refer to following detailed description for the present invention and accompanying drawing, but these illustrate and institute's accompanying drawings is only used for the present invention is described, but not any restriction is done to right of the present invention.
Accompanying drawing explanation
Fig. 1 illustrates the circuit diagram according to known common voltage circuit module.
Fig. 2 illustrates the circuit diagram of the common voltage circuit module according to the embodiment of the present invention.
Fig. 3 illustrates that the variable resistor element of the foundation embodiment of the present invention is the circuit operation schematic diagram of suspension joint.
Fig. 4 illustrates that the variable resistor element according to the embodiment of the present invention is the circuit operation schematic diagram come off.
Fig. 5 illustrates the usefulness figure of the school tune result according to the variable resistor element of the embodiment of the present invention.
[main element symbol description]
1,9: common voltage circuit module
XVAA, GMA: power end
VCOM: common voltage end
GND: earth terminal
R1, R2, R3, R4,91,92: resistive element
VR, 93: variable resistor element
N1 ~ N3,93a ~ 93c: end points
Embodiment
(embodiment of common voltage circuit module)
Please refer to Fig. 2, Fig. 2 illustrates the circuit diagram of the common voltage circuit module according to one embodiment of the invention.As shown in Figure 2, common voltage circuit module 1 has power end XVAA, earth terminal GND and common voltage end VCOM tri-end points respectively, and comprises variable resistor element VR, resistive element R1, R2, R3 and R4.Below elaborate with regard to each portion element of common voltage circuit module 1 respectively.
Common voltage end VCOM is in order to couple the display module (not shown in Fig. 2) of display device (such as liquid crystal display or digital lcd TV), make display module by receiving the voltage level (common voltage level) that common voltage end VCOM exports, and display frame can be produced.In addition, the voltage that common voltage end VCOM exports is a reference voltage, therefore can be designed as ground voltage or determine depending on actual user demand, and the present invention is not limited at this.In addition, the operating voltage requirements scope of the voltage level foundation display device of power end XVAA is arranged, and the present invention is not also limited at this.
Variable resistor element VR has first end N1, the second end N2 and point pressure side N3 tri-terminals respectively, wherein first end N1 is coupled to power end XVAA by resistive element R1, second end N2 is coupled to earth terminal GND by resistive element R2, and point pressure side N3 is then coupled to common voltage end VCOM.It should be noted that, first end N1 and the second end N2 of variable resistor element VR are fixed contact, point pressure side N3 is then slidably contact, make variable resistor element VR by the proportionate relationship between adjustment first end N1 to point pressure side N3 and point pressure side N3 to the second end N2 two sections, the resistance value that above-mentioned two sections can provide can be changed.
In practice, variable resistor element VR can be a kind of rotary variable resistor or rectilinearly-moved slide type variohm, and the present invention is not limited at this.If variable resistor element VR is rotary variable resistor, then can be adjusted two resistance values that variable resistor element VR can provide by the anglec of rotation increasing or reduce point pressure side N3.
Resistive element R1(the 3rd resistive element) be coupled to power end XVAA and variable resistor element VR first end N1 between; Resistive element R2(the 4th resistive element) be coupled between the second end N2 of variable resistor element VR and earth terminal GND; Resistive element R3(second resistive element) be coupled to power end XVAA and use between voltage end VCOM together; Resistive element R4(first resistive element) be coupled between common voltage end VCOM and earth terminal GND.In addition, above-described any one resistive element (R1, R2, R3 or R4) can be connect through group by least one resistance and formed, or (be such as bipolarity junction transistor npn npn (bipolarjunctiontransistor by least one transistor, or field effect transistor (field-effecttransistor BJT), the active element such as FET)) connect through group and formed, therefore the present invention is not limited at this.
In the operation of reality, common voltage circuit module 1 of the present invention is by above-mentioned variable resistor element VR, resistive element R1, R2, R3 and R4, form two electric current carrying pathway according to this, it is respectively electric current carrying pathway p1(first electric current carrying pathway) and electric current carrying pathway p2(second electric current carrying pathway).
Electric current carrying pathway p1 formed to earth terminal GND through resistive element R3 and resistive element R4 by power end XVAA, in other words, the electric current that electric current carrying pathway p1 transmits produced by the potential difference (PD) between power end XVAA and earth terminal GND, and the electric current that electric current carrying pathway p1 is transmitted sequentially also finally flow to earth terminal GND by power end XVAA, resistive element R3 and resistive element R4.
Electric current carrying pathway p2 formed to earth terminal GND through resistive element R1, variable resistor element VR and resistive element R4 by power end XVAA.In other words, the electric current that electric current carrying pathway p2 transmits also is because the potential difference (PD) between power end XVAA and earth terminal GND produced, and the electric current that electric current carrying pathway p2 is transmitted sequentially also finally flow to earth terminal GND by power end XVAA, resistive element R1, variable resistor element VR and resistive element R4.
Point pressure side N3 due to variable resistor element VR couples the relation of common voltage end VCOM, make common voltage circuit module 1 can by changing the proportionate relationship of point pressure side N3 between first end N1 and the second end N2 of variable resistor element VR, and the resistance value between the resistance value of power end XVAA extremely between point pressure side N3 optionally adjusted in electric current carrying pathway p2 and point pressure side N3 to earth terminal GND in electric current carrying pathway p2.By this, common voltage end VCOM can pass through electric resistance partial pressure principle, makes common voltage circuit module 1 can export common voltage level from common voltage end VCOM.
Therefore, before display device shipment, testing staff can by point pressure side N3 of fine setting variable resistor element VR, and the common voltage level that common voltage end VCOM is exported is the best common voltage level that display device can reach best efficiency.But, adjust in school or in the process of transporting, point pressure side N3 of variable resistor element VR may occur together by the suspension joint situation that the relation that couples between voltage end VCOM is off.Or, the dropping situations that the first end N1 of variable resistor element VR or the second end N2 is off with the corresponding resistive element R1 that couples or resistive element R2.(variable resistor element is the embodiment of suspension joint)
Please refer to Fig. 3, Fig. 3 illustrates that the variable resistor element of the foundation embodiment of the present invention is the circuit operation schematic diagram of suspension joint.As shown in Figure 3, when the suspension joint situation that point pressure side N3 of variable resistor element VR is off by the relation that couples between voltage end VCOM together, now common voltage circuit module 1 has at least two closed circuit.
Accept above-mentioned, the electric current carrying pathway of these two loops is respectively by power end XVAA through resistive element R3 and resistive element R4 and the final electric current carrying pathway p1 to earth terminal GND, and by power end XVAA through resistive element R1, variable resistor element VR and resistive element R4 and the final electric current carrying pathway p2 to earth terminal GND.
It should be noted that, although now common voltage circuit module 1 cannot adjust by variable resistor element VR the common voltage level that common voltage end VCOM exports, but by the resistive element R4 designed in advance, make common voltage end VCOM by the electric resistance partial pressure principle of the resistive element R3 in electric current carrying pathway p2 and resistive element R4, a common voltage level that can normally work can be exported according to this.
For example, if the voltage level that power end XVAA can provide is 9.8 volts, resistive element R1, resistive element R2 and variable resistor element VR are respectively 45.3K ohm, 20.5K ohm and 10K ohm, and point pressure side N3 of variable resistor element VR is rough equal with the proportionate relationship of first end N1 and the second end N2.Therefore, when only considering electric current carrying pathway p2, according to electric resistance partial pressure principle, the common voltage level about slightly 3.3 volts that common voltage end VCOM exports can be learnt.Then, if consider, variable resistor element VR is suspension joint common voltage end VCOM and resistive element R3 is 196K ohm when, if the common voltage level making common voltage end VCOM export still about slightly 3.3 volts, then also according to electric resistance partial pressure principle, and accordingly resistive element R4 is designed to 100K ohm.By this, even if when variable resistor element VR is suspension joint common voltage end VCOM, the common voltage level that common voltage end VCOM exports still can be fixed on a voltage level that can normally work.
In practice, due to different type of machines display device required for common voltage level be not quite similar, therefore the resistance value size of the resistive element of its inside of display device according to different type of machines is just needed, design the resistance value of resistive element R4, the common voltage level that common voltage end VCOM is exported can be fixed on a representative value that can normally work (typicalvalue, standard value).In general, the mean value that representative value obtains via the measurement data of multi-disc panel (panel) sets.In addition, display device can normal interval with this representative value for expectation value be positive and negative 15% normal distribution (also claiming Gaussian distribution), but the present invention is not limited with this scope.Therefore with above-mentioned example, the common voltage level that common voltage end VCOM exports is 3.3 volts (being representative value), and the voltage level that 2.8 ~ 3.8 volts are display device and can normally work.
(variable resistor element is the embodiment come off)
Please refer to Fig. 4, Fig. 4 illustrates that the variable resistor element according to the embodiment of the present invention is the circuit operation schematic diagram come off.As shown in Figure 4, when the dropping situations that the first end N1 of variable resistor element VR or the second end N2 is off with the corresponding resistive element R1 that couples or resistive element R2, now because resistive element R1, variable resistor element VR and resistive element R2 are open circuit, the electric current carrying pathway making common voltage circuit module 1 only can for by power end XVAA through resistive element R3 and resistive element R4 and the final electric current carrying pathway p1 to earth terminal GND.The common voltage level exported due to common voltage end VCOM and the design alternative of resistive element R4 also as above-mentioned, therefore repeat no more.
It should be noted that, if remove the resistive element R4 in common voltage circuit module 1, then when the situation that variable resistor element VR comes off, the common voltage circuit module 1 now lacking resistive element R4 can because when not having earth terminal GND as Zero potential reference, the common voltage level that common voltage end VCOM can be made to export is pulled to the voltage level of power end XVAA, and may cause the display frame of the display module of display device produces intense flashes, the circuit of display module damages situation or not expected situation.
(the possible effect of embodiment)
Please refer to Fig. 5, Fig. 5 illustrates the usefulness figure of the school tune result according to the variable resistor element of the embodiment of the present invention.As shown in Figure 5, the common voltage level (unit is volt) that Y-axis instruction common voltage end VCOM can export, and point proportionate relationship of pressure side N3 between first end N1 and the second end N2 of X-axis instruction variable resistor element VR.For example, if the VR of X-axis the closer to 0% time, then point pressure side N3 of variable resistor element VR is then the closer to first end N1; If the VR of X-axis the closer to 100% time, then point pressure side N3 of variable resistor element VR is then the closer to the second end N2.Common voltage circuit module 1 is the solid line of once linear, and known common voltage circuit module 9 is then the solid line of curve.
Therefore, can clearly be learnt by Fig. 5, the adjustment of point pressure side N3 of the common voltage level that its common voltage end of common voltage circuit module 1 VCOM exports and variable resistor element VR is a kind of linear relationship, testing staff is made can more easily to grasp adjustment situation, the common voltage level that common voltage end VCOM is exported comparatively can be changed places and be adjusted to the best common voltage level that display device can reach best efficiency, even if variable resistor element VR comes off or its point of pressure side N3 suspension joint time, the display frame that display device produces also can drop within shipment standard, decrease the cost that variable resistor element VR needs to reset.
In sum, the embodiment of the present invention provides a kind of common voltage circuit module for display device, by resistive element R4(first resistive element) setting, make the variable resistor element in common voltage circuit module because be subject to external force factor, and cause variable resistor element to come off or its point of pressure side suspension joint time, common voltage circuit module still by with pre-designed resistive element R4, makes common voltage end export a voltage level that display device can normally be worked according to this.In addition, the common voltage circuit module of the embodiment of the present invention is by means of only simple circuit design, variable resistor element can be avoided to come off or the situation that the circuit of the intense flashes that point pressure side of variable resistor element produces for display device during suspension joint or its display module damages, except adding the practicality in practical application, also improve display device make efficiency and yield, and reduce power attenuation.
The foregoing is only embodiments of the invention, it is also not used to limit to the scope of the claims of the present invention.
Claims (6)
1. a common voltage circuit module, have a power end, an earth terminal respectively and use voltage end altogether, it is characterized in that, described common voltage circuit module comprises:
One first resistive element, is coupled to described common voltage end and described earth terminal;
One second resistive element, is coupled to described power end and described common voltage end, to be formed by described power end through described second resistive element and described first resistive element to one first electric current carrying pathway of described earth terminal;
One variable resistor element, there is a first end, one second end and one point of pressure side, described first end and described second end couple described power end and described earth terminal respectively, to be formed by described power end through described variable resistor element to one second electric current carrying pathway of described earth terminal, described point of pressure side couples described common voltage end, optionally to adjust the resistance value between resistance value between described power end in described second electric current carrying pathway to described point of pressure side and described point of pressure side to described earth terminal;
One the 3rd resistive element, is respectively coupled between described power end and the described first end of described variable resistor element; And
One the 4th resistive element, is respectively coupled between the described first end of described variable resistor element and described earth terminal;
Wherein, described common voltage circuit module exports altogether with voltage level from described common voltage end, described common voltage circuit module is also according to described 3rd resistive element and described 4th resistive element, formed by described second electric current carrying pathway of described power end through described 3rd resistive element, described variable resistor element and described 4th resistive element extremely described earth terminal, and described first electric current carrying pathway is without described 3rd resistive element and described 4th resistive element.
2. common voltage circuit module according to claim 1, is characterized in that, described first resistive element, described second resistive element, described 3rd resistive element and described 4th resistive element at least one of them is connect by least one transistor group and is formed.
3. common voltage circuit module according to claim 1, is characterized in that, described first resistive element is connect by least one resistor group and formed.
4. a display device, is characterized in that, comprising:
Use altogether potential circuit module, there is a power end, an earth terminal respectively and use voltage end altogether, comprising:
One first resistive element, is coupled to described common voltage end and described earth terminal;
One second resistive element, is coupled to described power end and described common voltage end, to be formed by described power end through described second resistive element and described first resistive element to one first electric current carrying pathway of described earth terminal;
One variable resistor element, there is a first end, one second end and one point of pressure side, described first end and described second end couple described power end and described earth terminal respectively, to be formed by described power end through described variable resistor element to one second electric current carrying pathway of described earth terminal, described point of pressure side couples described common voltage end, optionally to adjust the resistance value between resistance value between described power end in described second electric current carrying pathway to described point of pressure side and described point of pressure side to described earth terminal;
One the 3rd resistive element, is respectively coupled between described power end and the described first end of described variable resistor element; And
One the 4th resistive element, is respectively coupled between the described first end of described variable resistor element and described earth terminal;
Wherein, described common voltage circuit module exports altogether with voltage level from described common voltage end, described common voltage circuit module is also according to described 3rd resistive element and described 4th resistive element, formed by described second electric current carrying pathway of described power end through described 3rd resistive element, described variable resistor element and described 4th resistive element extremely described earth terminal, and described first electric current carrying pathway is without described 3rd resistive element and described 4th resistive element; And
One display module, couples described common voltage end, receives described common voltage level, produces a display frame according to this.
5. display device according to claim 4, is characterized in that, described first resistive element, described second resistive element, described 3rd resistive element and described 4th resistive element at least one of them is connect by least one transistor group and is formed.
6. display device according to claim 4, is characterized in that, described first resistive element is connect by least one resistor group and formed.
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| CN103325356B (en) * | 2013-06-21 | 2015-04-08 | 合肥京东方光电科技有限公司 | Voltage regulation circuit of common electrode and display device |
| CN108428437B (en) * | 2018-04-03 | 2021-02-19 | 昆山龙腾光电股份有限公司 | Public voltage driving circuit, control method thereof and display device |
| CN114863893A (en) * | 2022-05-20 | 2022-08-05 | 信利光电股份有限公司 | VCOM voltage regulation method and circuit of display module |
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| TW200406729A (en) * | 2002-08-02 | 2004-05-01 | Nec Lcd Technologies Ltd | Liquid crystal display device |
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| KR101209039B1 (en) * | 2005-10-13 | 2012-12-06 | 삼성디스플레이 주식회사 | Driving apparatus for liquid crystal display and liquid crystal display including the same |
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| TW200406729A (en) * | 2002-08-02 | 2004-05-01 | Nec Lcd Technologies Ltd | Liquid crystal display device |
| JP2011217115A (en) * | 2010-03-31 | 2011-10-27 | Sony Corp | Inverter circuit and display device |
| CN102237050A (en) * | 2010-04-27 | 2011-11-09 | 北京京东方光电科技有限公司 | Grid driving circuit, grid voltage regulating method and liquid crystal display |
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Address after: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Patentee after: Qunkang Technology (Shenzhen) Co., Ltd. Patentee after: Innolux Display Group Address before: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Patentee before: Qunkang Technology (Shenzhen) Co., Ltd. Patentee before: Chimei Optoelectronics Co., Ltd. |