CN106251824B - Common electrical voltage regulator circuit and common voltage adjusting method, liquid crystal display panel - Google Patents
Common electrical voltage regulator circuit and common voltage adjusting method, liquid crystal display panel Download PDFInfo
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- CN106251824B CN106251824B CN201610912697.9A CN201610912697A CN106251824B CN 106251824 B CN106251824 B CN 106251824B CN 201610912697 A CN201610912697 A CN 201610912697A CN 106251824 B CN106251824 B CN 106251824B
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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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Abstract
The present invention discloses a kind of common electrical voltage regulator circuit and common voltage adjusting method, liquid crystal display panel, it is related to technical field of liquid crystal display, the common voltage value that circuit output is adjusted to solve existing common voltage differs larger with optimal value, the technical problem for causing the flicker level of liquid crystal display device larger.The common electrical voltage regulator circuit includes: electric discharge voltage regulating module, is used to adjust the common voltage provided to liquid crystal display panel；And variable module, it is connect with the electric discharge voltage regulating module.The liquid crystal display panel includes common electrical voltage regulator circuit described in above-mentioned technical proposal, and the adjusting method of the common voltage is used to adjust the common voltage in the liquid crystal display panel using above-mentioned common electrical voltage regulator circuit.Common electrical voltage regulator circuit and common voltage adjusting method provided by the invention, liquid crystal display panel are used for liquid crystal display device.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a common voltage regulating circuit, a common voltage regulating method and a liquid crystal display panel.
Background
A conventional liquid crystal display device generally includes a liquid crystal display panel including an upper substrate and a lower substrate disposed opposite to each other, and a liquid crystal layer filled between the upper substrate and the lower substrate, the upper substrate having a common electrode thereon, and the lower substrate having a pixel electrode thereon. A voltage difference exists between the pixel electrode and the opposite common electrode, the voltage difference is called as a display voltage, and the display voltage drives liquid crystal molecules in the liquid crystal layer to deflect, so that the liquid crystal display device displays different gray scales, and further, liquid crystal display is realized.
The display voltage is generally divided into two polarities, and is a positive polarity when the voltage of the pixel electrode is higher than the voltage of the common electrode; when the voltage of the pixel electrode is lower than the common voltage, the display voltage is negative polarity. In the prior art, the display voltage is continuously and alternately changed between the positive polarity and the negative polarity by changing the voltage of the pixel electrode, so that the liquid crystal molecules are continuously deflected, and the liquid crystal molecules are prevented from being always in the electric field with the same polarity, so as to prevent the characteristics of the liquid crystal molecules from being damaged.
Therefore, if the common voltage in the lcd panel is not accurate, the lcd screen will flicker (flicker) when the display voltage is continuously alternated. In view of the above, there is a conventional common Voltage adjusting circuit provided in a liquid crystal display panel, which provides a common Voltage to the liquid crystal display panel to adjust the common Voltage, wherein a Discharge Voltage Regulator (DVR) is provided in the common Voltage adjusting circuit, and after the liquid crystal display panel is manufactured, the common Voltage outputted from the common Voltage adjusting circuit is adjusted by adjusting the Discharge Voltage Regulator, thereby ensuring that a stable common Voltage can be obtained at a common electrode in the liquid crystal display panel.
However, the discharge adjustment module in the related art is fixed for the adjustment range and the adjustment division of the common voltage, and in actual production, the adjustment range and the adjustment division required to adjust the common voltage to an optimum value are different for different liquid crystal display panels. This causes a large difference between the value of the common voltage outputted from the conventional common voltage adjusting circuit and the optimum value, resulting in a large degree of flicker of the liquid crystal display device.
Disclosure of Invention
The invention aims to provide a public voltage regulating circuit, a public voltage regulating method thereof and a liquid crystal display panel, and aims to solve the technical problem that the flicker degree of a liquid crystal display device is large due to the fact that the difference between the public voltage value output by a discharge voltage regulating module and the optimal value is large due to the fact that the regulating range and the regulating graduation of the public voltage regulating circuit are fixed.
In order to achieve the above purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a common voltage adjusting circuit for providing a common voltage in a liquid crystal display panel, comprising: a discharge voltage regulating module for regulating a common voltage supplied to the liquid crystal display panel; and the variable module is connected with the discharge voltage regulating module and is used for changing the regulation range and/or the regulation graduation of the public voltage by providing different variable values when the public voltage output by the public voltage regulating circuit is regulated.
The public voltage regulating circuit provided by the invention comprises a discharge voltage regulating module and a variable module, wherein the variable module can provide different variable values so as to change the regulating range and/or the regulating graduation when the discharge voltage regulating module regulates the public voltage. Compared with the prior art that the adjustment range and the adjustment graduation of the common voltage output by the discharge voltage regulating module are fixed, the common voltage adjusting circuit can select a proper adjustment range and/or adjustment graduation according to the actual condition of the liquid crystal display panel, so that the common voltage is adjusted, the value of the common voltage output by the common voltage adjusting circuit can be close to an optimal value, and finally the flicker degree of a liquid crystal display device applying the common voltage adjusting circuit is minimum.
In a second aspect, the present invention provides a liquid crystal display panel comprising the common voltage regulating circuit according to the above technical solution.
Compared with the prior art, the technical effect of the liquid crystal display panel provided by the invention is the same as that of the liquid crystal display panel, and the details are not repeated here.
In a third aspect, the present invention provides a method for adjusting a common voltage, which is applied to the common voltage adjusting circuit in the above technical solution, and the method for adjusting a common voltage includes the following steps:
supplying power to the liquid crystal display panel to enable the liquid crystal display panel to display a preset picture;
a variable output module of the public voltage regulating circuit provides a first variable value, regulates the public voltage output by a discharge voltage regulating module of the public voltage regulating circuit to minimize the flicker degree of the preset picture, and records the flicker degree at the moment as A;
the variable output module provides a second variable value, adjusts the discharge voltage regulation module to enable the flicker degree of the preset picture to be minimum, and records the flicker degree at the moment as B;
comparing the sizes of A and B, if A is smaller than B, enabling a variable output module to provide the first variable value, adjusting a discharge voltage regulation module to enable the flicker degree of the preset picture to be A, and finishing the adjustment; if A is larger than B, the regulation is finished.
According to the method for adjusting the common voltage, the liquid crystal display panel of the technical scheme is used for adjusting the common voltage output by the common voltage adjusting circuit twice, the variable module is enabled to provide a first variable value during the first adjustment, and the variable module is enabled to provide a second variable value during the second adjustment. The adjusting range and/or the adjusting graduation of the discharging voltage regulating module corresponding to the first variable value are different from the second variable value, so that the more proper adjusting range and the more proper adjusting graduation can be selected, and the common voltage value output by the common voltage adjusting circuit is closer to the optimal value. Therefore, compared with the adjustment range and adjustment graduation fixing of the common voltage in the prior art, the adjustment method of the common voltage can better reduce the flicker degree of the liquid crystal display device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a common voltage regulation circuit provided in embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a common voltage regulating circuit provided in embodiment 2 of the present invention.
Fig. 3 is a schematic diagram of a common voltage regulating circuit according to embodiment 3 of the present invention.
Fig. 4 is a schematic diagram of a common voltage regulating circuit provided in embodiment 4 of the present invention.
Description of reference numerals:
10-discharge voltage regulation module, OUT-output pin of discharge voltage regulation module,
a SET pin of the SET-discharge voltage regulating module, an output lead of the 11-discharge voltage regulating module,
40-downstream resistance, 120-voltage output module,
121. 321, 421-upstream resistance, 221-first upstream resistance,
122. 222, 422-first voltage transistor, 123, 223, 423-first voltage terminal,
124. 224, 424-the first voltage signal control terminal, 225-the second upstream resistance,
126. 226, 426-second voltage transistor, 127, 227, 427-second voltage terminal,
128. 228, 428-second voltage signal control terminal, 131-set resistance,
330-set resistance module, 331-first set resistance,
332-a first setting transistor, 333-a first setting resistor control terminal,
334-a second set resistor, 335-a second set transistor,
336-second set resistance control terminal.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of various embodiments of the present invention, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, for a non-polar element such as a resistor, the "input end" and the "output end" are not used to limit the specific flowing direction of signals, but are used to describe the connection relationship between the non-polar element and other elements. For example, for a grounded resistor, the signal direction may be directed from the ground to the element connected to the resistor or from the element connected to the resistor to the ground.
[ example 1 ]
As shown in fig. 1, the present embodiment provides a common voltage regulating circuit for supplying a common voltage in a liquid crystal display panel, which includes a discharge voltage regulating module 10, a variable module, a setting resistor 131, and a downstream resistor 40.
The Discharge Voltage Regulator module 10 (DVR) may employ an ISL45042 circuit, which includes a SET pin SET and an output pin OUT. The input end of the setting resistor 131 is connected with the setting pin SET, and the output end is grounded; the input of the downstream resistor 40 is connected to the output pin OUT, and the output is grounded. An output lead 11 is connected to the output pin OUT, and a common voltage is supplied to elements such as a common electrode in the liquid crystal display panel through the output lead 11.
The variable module is a voltage output module 120, and an output end of the variable module is connected to an output pin OUT of the discharge voltage regulating module 10, and includes an upstream resistor 121, a first voltage transistor 122, and a second voltage transistor 126. Wherein, the output end of the upstream resistor 121 is connected to the output end of the voltage output module 120; the control terminal of the first voltage transistor 122 is connected to the first voltage signal control terminal 124, the input terminal thereof is connected to the first voltage terminal 123, and the output terminal thereof is connected to the input terminal of the upstream resistor 121. The control terminal of the second voltage transistor 126 is connected to the second voltage signal control terminal, the input terminal is connected to the second voltage terminal 127, and the output terminal is connected to the input terminal of the upstream resistor 121. The voltage output from the first voltage terminal 123 is different from the voltage output from the second voltage terminal 127.
According to the above structure, when the first voltage signal control terminal 124 inputs a predetermined electrical signal to the control terminal of the first voltage transistor 122, the input terminal and the output terminal of the first voltage transistor 122 are conducted, so that the first voltage terminal 123 and the input terminal of the upstream resistor 121 are electrically connected via the first voltage transistor 122. Similarly, when the second voltage signal control terminal inputs a predetermined electrical signal to the control terminal of the second voltage transistor 126, the input terminal and the output terminal of the second voltage transistor 126 are conducted, so that the second voltage terminal 127 and the input terminal of the upstream resistor 121 are electrically connected through the second voltage transistor 126. Therefore, by controlling the first voltage signal control terminal 124 and the second voltage signal control terminal, the first voltage terminal 123 or the second voltage terminal 127 can provide a voltage.
How the first voltage terminal 123 provides the voltage is taken as an example to adjust the common voltage in the present embodiment. The voltage output from the first voltage terminal 123 is divided by the upstream resistor 121 and the downstream resistor 40, and the voltage across the downstream resistor 40, that is, the common voltage output from the common voltage adjusting circuit, can be adjusted by adjusting the resistance value of the discharge voltage adjusting module 10 connected in parallel to the downstream resistor 40.
The adjustment of the discharge voltage regulation module 10 is realized by a digital potentiometer (DCP, not shown) provided in the ISL45042 circuit, and the setting value setting (the value range of the setting value is 1 to 2)nAnd include 1 and 2nWhere n is the number of bits of the digital potentiometer), the voltage division condition of the upstream resistor 121 and the downstream resistor 40 can be changed, and further, the common voltage output by the common voltage regulating circuit can be changed. Under the condition that the voltage provided by the first voltage terminal 123 is not changed, when the setting value is 1, the maximum common voltage value V is output by the common voltage regulating circuitmax1(ii) a When the setting value is 2nThe common voltage regulating circuit outputs the minimum common voltage value Vmin1。
Specifically, let the resistance value of the upstream resistor 121 be RaThe downstream resistor 40 has a resistance value RbSetting the resistance of the resistor 131 to Rset(ii) a Let the voltage value output from the first voltage terminal 123 be V1The voltage value output by the second voltage terminal 127 is V2(ii) a Setting the setting value of the digital potentiometer. The common voltage output value corresponding to the first voltage terminal 123 is:
where k is a constant determined by the specific circuit of the components such as the discharge voltage regulating module 10, there are different values of k for different discharge voltage regulating modules 10. The value of k can be directly obtained according to the manufactured ISL45042 circuit, or can be calculated by collecting actual data after the common voltage regulating circuit provided by the embodiment is manufactured, and the value of k can be 20.
Accordingly, the maximum value V of the common voltage corresponding to the first voltage terminal 123max1And a minimum value Vmin1Satisfies the following conditions:
the maximum value V of the common voltage corresponding to the second voltage terminal 127 is similar to the first voltage terminal 123max2And a minimum value Vmin2Satisfies the following conditions:
as can be seen from the above relational expression, in the first voltage terminal 123 and the second voltage terminal 127, the maximum value of the common voltage corresponding to the larger output voltage is larger than the maximum value of the common voltage corresponding to the smaller output voltage, and the minimum value of the common voltage corresponding to the larger output voltage is larger than the minimum value of the common voltage corresponding to the smaller output voltage, that is, the adjustment ranges of the common voltages corresponding to the first voltage terminal 123 and the second voltage terminal 127 are different.
According to the above description, with the common voltage adjusting circuit provided in the present embodiment, for different liquid crystal display substrates, an appropriate common voltage adjusting range can be selected according to the actual situation of the liquid crystal display substrate. Compared with the prior art that the adjustment range of the common voltage is fixed when the common voltage is adjusted by the common voltage adjusting circuit, the liquid crystal display device and the method can reduce the possibility that the common voltage required by the liquid crystal display substrate exceeds the adjustable range of the common voltage adjusting circuit, reduce the flicker degree of the liquid crystal display device made of the liquid crystal display substrate and improve the yield of the liquid crystal display substrate.
It is understood that the first voltage terminal 123 and the second voltage terminal 127 may be two power sources with different output voltages; or the same power supply with variable output voltage.
In addition, as an optimized solution of the present embodiment, the first voltage signal control terminal 124 and the second voltage signal control terminal may be the same port, and the first voltage transistor 122 is a high-level conducting transistor, and the second voltage transistor 126 is a low-level conducting transistor; alternatively, the first voltage transistor 122 is a low-conduction transistor and the second voltage transistor 126 is a high-conduction transistor.
According to the optimized scheme, the first voltage triode 122 and the second voltage triode 126 can be simultaneously controlled through only one control end, so that only one of the first voltage triode 122 and the second voltage triode 126 is turned on, and the other one is turned off. Therefore, the optimization scheme can simplify the common voltage regulating circuit and optimize the manufacturing process of the liquid crystal display substrate.
[ example 2 ]
Hereinafter, a common voltage regulator circuit according to embodiment 2 will be described with reference to fig. 2. In this embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted.
The difference between this embodiment and embodiment 1 is that the voltage output module 220 (i.e., the variable module) includes a first upstream resistor 221, a second upstream resistor 225, a first voltage transistor 222, and a second voltage transistor 226. Wherein, the output end of the first upstream resistor 221 is connected with the output end of the voltage output module 220; the control terminal of the first voltage transistor 222 is connected to the first voltage signal control terminal 224, the input terminal thereof is connected to the first voltage terminal 223, and the output terminal thereof is connected to the input terminal of the first upstream resistor 221. The output end of the second upstream resistor 225 is connected with the output end of the voltage output module 220; the second voltage transistor 226 has a control terminal coupled to the second voltage signal control terminal 228, an input terminal coupled to the second voltage terminal 227, and an output terminal coupled to the input terminal of the second upstream resistor 225. The resistance of the first upstream resistor 221 is not equal to the resistance of the second voltage terminal 227, and/or the voltage output by the first voltage terminal 223 is not equal to the voltage output by the second voltage terminal 227.
Specifically, let the resistance of the first upstream resistor 221 be Ra1The second upstream resistor 225 has a resistance of Ra2The downstream resistor 40 has a resistance value RbSetting the resistance of the resistor 131 to Rset(ii) a Let the voltage value output from the first voltage terminal 223 be V1The voltage value outputted from the second voltage terminal 227 is V2(ii) a Setting the setting value of the digital potentiometer.
The maximum value V of the common voltage corresponding to the first voltage terminal 223 and the first upstream resistor 221max1And a minimum value Vmin1Satisfies the following conditions:
similarly, the maximum value V of the common voltage corresponding to the second voltage terminal 227 and the second upstream resistor 225max2And a minimum value Vmin2Satisfies the following conditions:
where k is a constant determined by the specific circuit of the components such as the discharge voltage regulating module 10, there are different values of k for different discharge voltage regulating modules 10. The value of k can be directly obtained according to the manufactured ISL45042 circuit, or can be calculated by collecting actual data after the common voltage regulating circuit provided by the embodiment is manufactured, and the value of k can be 20.
Therefore, when the voltage V1 output from the first voltage terminal 223 and the voltage V2 output from the second voltage terminal 227 are equal to each other, the maximum value and the minimum value of the corresponding common voltage are larger in the first upstream resistor 221 and the second upstream resistor 225, whichever has a smaller resistance value. That is, the adjustment ranges of the common voltages corresponding to the first upstream resistor 221 and the second upstream resistor 225 are different.
In addition, in the case where the voltage V1 output from the first voltage terminal 223 and the voltage V2 output from the second voltage terminal 227 are not equal, different common voltage adjustment ranges can be obtained by setting the resistances of the first upstream resistor 221 and the second upstream resistor 225.
Therefore, with the common voltage adjusting circuit provided by the embodiment, for different liquid crystal display substrates, an appropriate common voltage adjusting range can be selected according to the actual situation of the liquid crystal display substrate. Compared with the prior art that the adjustment range of the common voltage is fixed when the common voltage is adjusted by the common voltage adjusting circuit, the liquid crystal display device and the method can reduce the possibility that the common voltage required by the liquid crystal display substrate exceeds the adjustable range of the common voltage adjusting circuit, reduce the flicker degree of the liquid crystal display device made of the liquid crystal display substrate and improve the yield of the liquid crystal display substrate.
[ example 3 ]
Hereinafter, a common voltage regulator circuit provided in embodiment 3 will be described with reference to fig. 3. In this embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted.
The common voltage regulating circuit provided by the present embodiment is used for supplying a common voltage in a liquid crystal display panel, and includes a discharge voltage regulating module 10, a variable module, an upstream resistor 321, and a downstream resistor 40.
The Discharge Voltage Regulator module 10 (DVR, not shown) may employ an ISL45042 circuit including a SET pin SET and an output pin OUT. The output terminal pin is connected to the output terminal of the upstream resistor 321 and the input terminal of the downstream resistor 40, the input terminal of the upstream resistor 321 is connected to the voltage terminal 322, and the output terminal of the downstream resistor 40 is grounded.
The variable module is a setting resistor module 330, the output end of which is connected to the setting pin SET of the discharge voltage regulating module 10, and which includes a first setting resistor 331, a second setting resistor 334, a first setting transistor 332, and a second setting transistor 335. Wherein, the output terminal of the first setting resistor 331 is grounded; the control end of the first setting triode 332 is connected with the control end 333 of the first setting resistor, the input end is connected with the output end of the setting resistor module 330, and the output end is connected with the input end of the first setting resistor 331; the output terminal of the second setting resistor 334 is grounded; the control terminal of the second setting transistor 335 is connected to the second setting resistor control terminal 336, the input terminal is connected to the input terminal of the setting resistor module 330, and the output terminal is connected to the output terminal of the second setting resistor 334. According to the above configuration, the discharge voltage adjusting module 10 can be connected to the first setting resistor 331 or the second setting resistor 334 by controlling the first setting resistor control terminal 333 and the second setting resistor control terminal 336.
A process of adjusting the common voltage using the common voltage adjusting circuit provided in this embodiment will be described, taking a case where the discharge voltage adjusting module 10 is connected to the first setting resistor 331 as an example. The voltage outputted from the voltage terminal 322 is divided by the upstream resistor 321 and the downstream resistor 40, and the voltage across the downstream resistor 40, i.e. the common voltage outputted from the common voltage regulating circuit, is regulated by regulating the discharge voltage regulating module 10 connected in parallel with the downstream resistor 40.
The adjustment is realized by a digital potentiometer (DCP) arranged in the ISL45042 circuit, and the setting value setting of the digital potentiometer (the value range of the setting value is 1-2)nThe integer of (1) and (2) inclusivenWhere n is the number of bits of the digital potentiometer), the resistance provided by the ISL45042 circuit can be changed, so as to change the voltage division condition of the upstream resistor 321 and the downstream resistor 40, and further change the common voltage output by the common voltage regulating circuit. It will be appreciated that the output current I of the common voltage regulating circuitOUTIs adjusted to the division value I0(i.e., each time the setting value changes by 1, IOUTThe larger the change amount) of the common voltage, the larger the adjustment index value of the common voltage outputted by the common voltage adjustment circuit (i.e., the change amount of the common voltage value every time the setting value changes by 1). Therefore, the current I can be adjusted by adjusting the current IOUTIs adjusted by a scale I0And adjusting the adjustment division of the common voltage.
Specifically, let the resistance value of the first setting resistor 331 be RSET1The second setting resistor 334 has a resistance value of RSET2(ii) a Setting the voltage value output by the voltage terminal 322 as V; setting the setting value of the digital potentiometer. Then for the first setting resistor 331, its corresponding output current IOUTIs adjusted by a scale I01Satisfies the following conditions:
the output current I corresponding to the second setting resistor 334outRegulatingGraduation I02Satisfies the following conditions:
where k is a constant determined by the specific circuit of the components such as the discharge voltage regulating module 10, there are different values of k for different discharge voltage regulating modules 10. The value of k can be directly obtained according to the manufactured ISL45042 circuit, or can be calculated by collecting actual data after the common voltage regulating circuit provided by the embodiment is manufactured, and the value of k can be 20.
Since the first setting resistor 331 and the second setting resistor 334 have different resistance values, they respectively correspond to the output current I of the common voltage regulating circuitOUTThe adjustment division values of (1) are different, that is, the adjustment division of the common voltage corresponding to the first setting resistor 331 and the second setting resistor 334 are different. For example, if the adjustment division of the common voltage corresponding to the first setting resistor 331 is greater than the adjustment division of the common voltage corresponding to the second setting resistor 334, the first setting transistor 332 is turned on, the second setting transistor 335 is turned off, the first setting resistor 331 is connected to the discharge voltage regulation module, and the common voltage output by the common voltage regulation circuit is coarsely regulated; at this time, if the flicker level of the liquid crystal display device cannot be reduced satisfactorily, the first setting transistor 332 is turned off, the second setting transistor 335 is turned on, the common voltage outputted from the common ground voltage adjusting circuit is finely adjusted, and the flicker level of the liquid crystal display device can be further reduced, thereby making the common voltage value closer to the optimum value.
Therefore, compared with the prior art that the adjustment graduation of the common voltage is fixed when the common voltage is adjusted by the common voltage adjusting circuit, the embodiment of the invention can avoid the adjustment graduation of the common voltage from being fixed, reduce the flicker degree of the liquid crystal display device made of the liquid crystal display substrate and improve the yield of the liquid crystal display substrate.
As an optimized solution of the present embodiment, the first set resistance control terminal 333 and the second set resistance control terminal 336 are the same port; also, the first setting transistor 332 is a high-level conducting transistor, and the second setting transistor 335 is a low-level conducting transistor; alternatively, the first setting transistor 332 is a low conduction transistor and the second setting transistor 335 is a high conduction transistor.
According to the optimized scheme, the first setting triode 332 and the second setting triode 335 can be simultaneously controlled through only one signal end, so that only one of the first setting triode 332 and the second setting triode 335 is turned on, and the other is turned off. Therefore, the optimization scheme can simplify the common voltage regulating circuit and optimize the manufacturing process of the liquid crystal display substrate.
[ example 4 ]
Hereinafter, a common voltage regulator circuit provided in embodiment 4 will be described with reference to fig. 4. In this embodiment, the same components as those in embodiment 3 are denoted by the same reference numerals, and descriptions thereof are omitted.
The difference between this embodiment and embodiment 3 is that the common voltage regulating circuit includes an upstream resistor 421, a first voltage transistor 422, and a second voltage transistor 426. Wherein, the output end of the upstream resistor 421 is connected with the output end of the discharge voltage regulating module 10; the control end of the first voltage triode 422 is connected with the first voltage signal control end 424, the input end is connected with the first voltage end 423, and the output end is connected with the output end of the discharging voltage regulating module 10; the second voltage transistor 426 has a control terminal connected to the second voltage signal control terminal 428, an input terminal connected to the second voltage terminal 427, and an output terminal connected to the output terminal of the discharging voltage-regulating module 10.
According to the above structure, when the first voltage signal control terminal 424 outputs an electrical signal to the first voltage transistor 422, and the first setting resistor control terminal 333 outputs an electrical signal to the first setting transistor 332, the first voltage transistor 422 and the first setting transistor 332 are respectively turned on, so that the first voltage terminal 423 outputs a voltage to the upstream resistor 421, and the setting pin SET is connected to the first setting resistor 331; similarly, when the second voltage signal control terminal 428 outputs an electrical signal to the second voltage transistor 426 and the second SET resistor control terminal 336 outputs an electrical signal to the second SET transistor 335, the second voltage transistor 426 and the second SET transistor 335 are turned on, respectively, such that the second voltage terminal 427 outputs a voltage to the upstream resistor 421, and the SET pin SET is connected to the second SET resistor 334.
In addition, in the present embodiment, regarding the common voltage outputted by the common voltage adjusting circuit, the adjustment division of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is not equal to the adjustment division of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334; the minimum value of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is equal to the minimum value of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334.
Specifically, let the resistance of the upstream resistor 421 be RaThe downstream resistor 40 has a resistance value RbThe first setting resistor 331 has a resistance value of Rset1The second setting resistor 334 has a resistance value of Rset2(ii) a Let the voltage value output by the first voltage terminal 423 be V1The voltage value output from the second voltage terminal 427 is V2And then:
output current I corresponding to the first voltage terminal 423 and the first setting resistor 331outIs adjusted by a scale I01Not equal to the output circuit I corresponding to the second voltage terminal 427 and the second setting resistor 334outIs adjusted by a scale I02I.e. by
Also, the minimum value of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is equal to the minimum value of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334, that is, the minimum value
Where k is a constant determined by the specific circuit of the components such as the discharge voltage regulating module 10, there are different values of k for different discharge voltage regulating modules 10. The value of k can be directly obtained according to the manufactured ISL45042 circuit, or can be calculated by collecting actual data after the common voltage regulating circuit provided by the embodiment is manufactured, and the value of k can be 20.
As described above, in the present embodiment, the adjustment division of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is not equal to the adjustment division of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334, so that the common voltage can be adjusted with a large adjustment division by using the common voltage adjusting circuit provided in the present embodiment, and when the flicker degree of the screen displayed on the liquid crystal display panel cannot be reduced satisfactorily, the other setting resistor is connected to the discharge voltage adjusting module 10, and the adjustment division of the common voltage corresponding to the setting resistor is small, so that the common voltage value can be brought closer to the optimum value. Compared with the prior art that the adjustment graduation of the common voltage is fixed when the common voltage is adjusted by the common voltage adjusting circuit, according to the embodiment of the invention, the adjustment graduation of the common voltage can be prevented from being fixed, the flicker degree of a liquid crystal display device made of the liquid crystal display substrate is reduced, and the yield of the liquid crystal display substrate is improved.
In addition, in this embodiment, the minimum value of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is equal to the minimum value of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334, so that the adjustment range of the common voltage corresponding to the first voltage terminal 423 and the first setting resistor 331 is close to the adjustment range of the common voltage corresponding to the second voltage terminal 427 and the second setting resistor 334, thereby avoiding a large change of the adjustment range of the common voltage due to a change of the adjustment precision of the common voltage, preventing the optimal value of the common voltage from falling in the adjustment range of the common voltage after the adjustment precision is changed, and finally ensuring that the voltage value output by the common voltage adjusting circuit is adjusted to be closest to the optimal value.
As an optimized solution of the present embodiment, the first voltage signal control terminal 424, the second voltage signal control terminal 428, the first set resistance control terminal 333 and the second set resistance control terminal 336 are the same port. The first voltage transistor 422 and the first setting transistor 332 are high-level transistors, and the second voltage transistor 426 and the second setting transistor 335 are low-level transistors; alternatively, the first voltage transistor 422 and the first setting transistor 332 are low-level conducting transistors, and the second voltage transistor 426 and the second setting transistor 335 are high-level conducting transistors.
According to the optimized scheme, the four triodes can be simultaneously controlled through only one signal control terminal, so that only the first voltage triode 422 and the first setting triode 332 are simultaneously started, or only the second voltage triode 426 and the second setting triode 335 are simultaneously started. Therefore, the optimization scheme can simplify the common voltage regulating circuit and optimize the manufacturing process of the liquid crystal display substrate.
[ example 5 ]
The embodiment provides a liquid crystal display panel, which comprises an upper substrate and a lower substrate which are oppositely arranged, and a liquid crystal layer filled between the upper substrate and the lower substrate, wherein a common electrode is arranged on the upper substrate, and a pixel electrode is arranged on the lower substrate.
In addition, the liquid crystal display panel provided in this embodiment further includes the common Voltage adjusting circuit described in any one of embodiments 1 to 4, which is configured to provide the common Voltage to the liquid crystal display panel and adjust the common Voltage, and the common Voltage adjusting circuit is provided with a Discharge Voltage Regulator module (DVR), and after the liquid crystal display panel is manufactured, the common Voltage output by the common Voltage adjusting circuit is adjusted by adjusting the Discharge Voltage Regulator module, so that the common electrode in the liquid crystal display panel can obtain a stable common Voltage.
Compared with the prior art, the technical effect of the liquid crystal display panel provided by the embodiment is the same as that of any one of embodiments 1 to 4, and is not repeated herein.
[ example 6 ]
The present embodiment provides a common voltage adjusting method applied to the common voltage adjusting circuit provided in any one of embodiments 1 to 4, the common voltage adjusting method including:
step 1, liquid supplies power to the liquid crystal display panel to enable the liquid crystal display panel to display a preset picture. In step 1, power may be directly supplied to the liquid crystal display panel after the liquid crystal display panel is manufactured, so that the liquid crystal display panel displays a preset picture. The power may also be supplied to the liquid crystal display device after the liquid crystal display device is manufactured, so that the liquid crystal display device presets a display screen, which is not limited herein. In addition, the preset screen should be a screen for easily confirming whether to flicker, such as a still solid image.
And 2, providing a first variable value by a variable output module of the public voltage regulating circuit, regulating the public voltage output by a discharge voltage regulating module of the public voltage regulating circuit to minimize the flicker degree of a preset picture, and recording the flicker degree at the moment as A.
Step 3, the variable output module provides a second variable value, the discharge voltage regulation module is regulated to enable the flicker degree of the preset picture to be minimum, and the flicker degree at the moment is recorded as B;
in step 2 and step 3, the first variable value and the second variable value may be the voltage signals in embodiments 1 to 2, or may be the set resistance values in embodiments 3 to 4. The evaluation of the degree of flicker may be a rough estimation by visual observation, or may be a statistical analysis of the number of flickers per unit time, or an analysis by a computer after imaging, and this embodiment is not particularly limited thereto.
Step 4, comparing the sizes of A and B, if A is smaller than B, enabling the variable output module to output the first variable signal to the discharge voltage regulation module again, regulating a counter in the discharge voltage regulation module to enable the flicker degree of a preset picture to be A, and finishing regulation; if A is larger than B, the regulation is finished.
According to the common voltage adjusting method of the present invention, the common voltage adjusting circuit provided in any one of embodiments 1 to 4 is used to adjust the common voltage outputted from the common voltage adjusting circuit twice, and the variable module is made to provide a first variable value in the first adjustment and a second variable value in the second adjustment. The adjusting range and/or the adjusting graduation of the discharging voltage regulating module corresponding to the first variable value are different from the second variable value, so that the more proper adjusting range and the more proper adjusting graduation can be selected, and the common voltage value output by the common voltage adjusting circuit is closer to the optimal value. Therefore, compared with the adjustment range and adjustment division fixing of the common voltage in the prior art, the adjustment method of the common voltage of the embodiment can better reduce the flicker degree of the liquid crystal display device.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments are described in a relatively simple manner since they are substantially similar to the apparatus embodiments, and reference may be made to some of the descriptions of the product embodiments for related points.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A common voltage regulating circuit for supplying a common voltage in a liquid crystal display panel, comprising:
a discharge voltage regulating module for regulating a common voltage supplied to the liquid crystal display panel; and
the variable module is connected with the discharge voltage regulating module and is used for changing the regulation range and/or the regulation graduation of the common voltage by providing different variable values when the common voltage output by the common voltage regulating circuit is regulated;
the output of variable module with the output of voltage regulation module that discharges is connected, is used for providing different voltages in the public voltage control circuit as the variable value, variable module includes: the output end of the first upstream resistor is connected with the output end of the variable module;
a control end of the first voltage triode is connected with a first voltage signal control end, an input end of the first voltage triode is connected with a first voltage end, and an output end of the first voltage triode is connected with an input end of the first upstream resistor;
the output end of the second upstream resistor is connected with the output end of the variable module; and
a second voltage triode, the control end of which is connected with the control end of a second voltage signal, the input end of which is connected with the second voltage end, and the output end of which is connected with the input end of the second upstream resistor,
wherein the voltage output by the first voltage end is not equal to the voltage output by the second voltage end;
or,
the output of variable module with discharge voltage regulation module's settlement pin is connected, is used for providing different settlement resistance in the public voltage control circuit as the variable value, the variable module includes: a first setting resistor, the input end of which is grounded;
the control end of the first setting triode is connected with the control end of a first setting resistor, the input end of the first setting triode is connected with the output end of the first setting resistor, and the output end of the first setting triode is connected with the output end of the variable module;
a second set resistance; the input end of the power supply is grounded; and
a second setting triode, the control end of which is connected with the control end of a second setting resistor, the input end of which is connected with the output end of the second setting resistor, the output end of which is connected with the output end of the variable module,
the resistance value of the first set resistor is smaller than that of the second set resistor.
2. The common voltage regulating circuit according to claim 1, wherein the first voltage signal control terminal and the second voltage signal control terminal are the same port;
the first voltage triode is a triode which is conducted at a high level, and the second voltage triode is a triode which is conducted at a low level; or, the first voltage triode is a triode conducted at a low level, and the second voltage triode is a triode conducted at a high level.
3. The common voltage regulating circuit according to claim 1 or 2, further comprising:
the input end of the setting resistor is grounded, and the output end of the setting resistor is connected with the setting pin of the discharge voltage regulating module; and
and the input end of the downstream resistor is grounded, and the output end of the downstream resistor is connected with the output end of the discharging voltage regulating module.
4. The common voltage regulating circuit according to claim 1, further comprising:
the output end of the upstream resistor is connected with the output end of the discharge voltage regulating module;
the control end of the first voltage triode is connected with the first voltage signal control end, the input end of the first voltage triode is connected with the first voltage end, and the output end of the first voltage triode is connected with the output end of the discharge voltage regulating module;
the control end of the second voltage triode is connected with the control end of the second voltage signal, the input end of the second voltage triode is connected with the second voltage end, and the output end of the second voltage triode is connected with the output end of the discharge voltage regulating module; and
and the input end of the downstream resistor is grounded, and the output end of the downstream resistor is connected with the output end of the discharging voltage regulating module.
5. The common voltage regulating circuit according to claim 4, wherein the first voltage signal control terminal, the second voltage signal control terminal, the first set resistance control terminal and the second set resistance control terminal are the same port;
the first voltage triode and the first setting triode are high-level conducted triodes, and the second voltage triode and the second setting triode are low-level conducted triodes; or, the first voltage triode and the first setting triode are triodes conducted at a low level, and the second voltage triode and the second setting triode are triodes conducted at a high level.
6. The common voltage regulating circuit according to claim 4 or 5, wherein the number of digits of the digit devices in the discharge voltage regulating module is set to n; setting the resistance value of the upstream resistor as RaThe resistance value of the first set resistor is RSET1The resistance value of the second set resistor is RSET2The downstream resistor has a resistance value of Rb(ii) a Setting the voltage value output by the first voltage end to be V1The voltage value output by the second voltage end is V2(ii) a Then n, Ra、RSET1、RSET2、Rb、V1And V2Satisfies the following relation:
and
wherein k is a constant.
7. A liquid crystal display panel comprising the common voltage adjusting circuit according to any one of claims 1 to 6.
8. A common voltage adjusting method applied to the common voltage adjusting circuit according to any one of claims 1 to 6, the common voltage adjusting method comprising:
supplying power to the liquid crystal display panel to enable the liquid crystal display panel to display a preset picture;
a variable output module of the public voltage regulating circuit provides a first variable value, regulates the public voltage output by a discharge voltage regulating module of the public voltage regulating circuit to minimize the flicker degree of the preset picture, and records the flicker degree at the moment as A;
the variable output module provides a second variable value, adjusts the discharge voltage regulation module to enable the flicker degree of the preset picture to be minimum, and records the flicker degree at the moment as B;
comparing the sizes of A and B, if A is smaller than B, enabling a variable output module to provide the first variable value, adjusting a discharge voltage regulation module to enable the flicker degree of the preset picture to be A, and finishing the adjustment; if A is larger than B, the regulation is finished.
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| CN201610912697.9A CN106251824B (en) | 2016-10-19 | 2016-10-19 | Common electrical voltage regulator circuit and common voltage adjusting method, liquid crystal display panel |
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| CN201610912697.9A CN106251824B (en) | 2016-10-19 | 2016-10-19 | Common electrical voltage regulator circuit and common voltage adjusting method, liquid crystal display panel |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295541A (en) * | 2012-10-30 | 2013-09-11 | 上海天马微电子有限公司 | Liquid crystal display and common voltage driving circuit thereof |
| CN103325356A (en) * | 2013-06-21 | 2013-09-25 | 合肥京东方光电科技有限公司 | Voltage regulation circuit of common electrode and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4366914B2 (en) * | 2002-09-25 | 2009-11-18 | 日本電気株式会社 | Display device drive circuit and display device using the same |
| KR101953325B1 (en) * | 2012-03-29 | 2019-03-04 | 엘지디스플레이 주식회사 | Method for controlling a flicker of liquid crystall display device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295541A (en) * | 2012-10-30 | 2013-09-11 | 上海天马微电子有限公司 | Liquid crystal display and common voltage driving circuit thereof |
| CN103325356A (en) * | 2013-06-21 | 2013-09-25 | 合肥京东方光电科技有限公司 | Voltage regulation circuit of common electrode and display device |
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