KR101686660B1 - Apparatus and method for controlling common voltage of liquid crystal display device - Google Patents

Apparatus and method for controlling common voltage of liquid crystal display device Download PDF

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KR101686660B1
KR101686660B1 KR1020150100949A KR20150100949A KR101686660B1 KR 101686660 B1 KR101686660 B1 KR 101686660B1 KR 1020150100949 A KR1020150100949 A KR 1020150100949A KR 20150100949 A KR20150100949 A KR 20150100949A KR 101686660 B1 KR101686660 B1 KR 101686660B1
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common voltage
period
liquid crystal
flicker
flicker value
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Korean (ko)
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오달석
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주식회사 두원테크
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

An apparatus for controlling the common voltage of a liquid crystal display device includes an optical sensor unit for measuring the flicker of an image displayed on a liquid crystal panel and calculating a flicker value based on a measured flicker waveform, and a common voltage setting part which stops a change of a common voltage if the flicker value gradually decreases and the rising period occurs when the common voltage is sequentially changed (increased or decreased), in adjusting the common voltage of the liquid crystal panel, and finally sets the common voltage to the liquid crystal panel. So, the common voltage can be quickly set.

Description

TECHNICAL FIELD [0001] The present invention relates to a common voltage regulating device and a common voltage regulating device for a liquid crystal display device,

The present invention relates to a common voltage regulating device and a regulating method for a liquid crystal display device, and more particularly, to a common voltage regulating device and a regulating method of a liquid crystal display device capable of quickly setting a common voltage capable of minimizing a flicker of a liquid crystal panel will be.

In general, a liquid crystal panel of a liquid crystal display device is formed by laminating first and second substrates having pixel electrodes and a common electrode, respectively, and then injecting liquid crystal between the two substrates to form a liquid crystal layer. In addition, a liquid crystal display device drives liquid crystal molecules of a liquid crystal layer through an electric field formed between a pixel electrode and a common electrode to display an image. In a liquid crystal display device, thin film transistors, which are switching elements, are arranged in a matrix form.

In a liquid crystal display device, a data signal of a data line, that is, a pixel voltage is applied to the pixel electrode of the first substrate by switching of the thin film transistor, and a common voltage is applied to the common electrode of the second substrate. That is, the liquid crystal panel of the liquid crystal display device displays the image by driving the liquid crystal by the difference between the pixel voltage and the common voltage.

The liquid crystal display device is designed to perform a polarity inversion operation that periodically changes the polarity of a voltage to prevent deterioration of liquid crystal, and frame inversion, line inversion, dot inversion, and the like are used.

That is, the pixel voltage is driven to be repeatedly applied with a positive voltage and a negative voltage on the basis of the common voltage. At this time, the common voltage should be adjusted so that the plus pixel voltage and the minus pixel voltage applied to the pixel electrode can be symmetrical to each other.

When the positive pixel voltage and the negative pixel voltage are not symmetrical with respect to the common voltage, the charged amount of the pixel voltage charged in each pixel is not constant, and a flicker phenomenon occurs in which the screen flickers when the pixel voltage is inverted .

Accordingly, when a liquid crystal panel of a liquid crystal display device is manufactured, a common voltage at which a flicker is minimized is set in the corresponding liquid crystal panel when each liquid crystal panel is tested.

Conventionally, when determining a common voltage at which a flicker phenomenon is minimized, flickers of the liquid crystal panel corresponding to each common voltage are optically measured while sequentially applying common voltages of all the values within the control range of the common voltage, The common voltage when the flicker occurs at the minimum is finally set in the liquid crystal panel.

Such a conventional method has a problem that it requires a long test time because the common voltage of all the values must be sequentially applied.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned technical problems, and provides a common voltage regulating device and a regulating method of a liquid crystal display device capable of quickly setting a common voltage generating a minimum flicker value.

According to an embodiment of the present invention, there is provided a liquid crystal display comprising: an optical sensor unit for measuring a flicker of an image displayed on a liquid crystal panel and calculating a flicker value based on the measured flicker waveform; And a control unit that controls the common voltage of the liquid crystal panel by receiving the flicker value calculated by the optical sensor unit, and when the common voltage is sequentially changed (increased or decreased), the flicker value gradually decreases and then increases And a common voltage setting unit that stops changing the common voltage and finally sets a common voltage corresponding to a minimum flicker value to the liquid crystal panel.

According to another embodiment of the present invention, there is provided an image display apparatus including: an optical sensor unit for measuring flicker of an image displayed on a liquid crystal panel and calculating a flicker value based on the measured flicker waveform; Wherein the common voltage of the liquid crystal panel is adjusted by receiving the flicker value calculated by the optical sensor unit, and when the common voltage is sequentially changed (increased or decreased) every first period, the flicker value gradually decreases, The common voltage is sequentially changed (increased or decreased) in every second period of the period longer than the first period after the period, and the first minimum flicker And a second minimum flicker value based on the common voltage that is changed every second period to determine a common voltage corresponding to the smallest flicker value among the first and second minimum flicker values to be finally supplied to the liquid crystal panel And a common voltage setting unit for setting the common voltage of the liquid crystal display device.

The first period is set to 0.01 seconds or more, and the second period is set to 0.04 seconds or more.

According to another aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel for measuring a flicker of an image to be displayed on a liquid crystal panel and calculating a flicker value based on the measured flicker waveform to adjust a common voltage of the liquid crystal panel, When a period in which the flicker value gradually decreases and then increases in a sequential manner (increase or decrease) occurs, the change of the common voltage is stopped and a common voltage corresponding to the minimum flicker value is finally set in the liquid crystal panel A common voltage control method for a liquid crystal display device is provided.

According to another aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel having a plurality of pixels arranged in a matrix, When the common voltage is sequentially changed (increased or decreased), the flicker value gradually decreases and then the common voltage is sequentially changed every second period of the period longer than the first period The first minimum flicker value by the common voltage changed for each of the first periods and the second minimum flicker value by the common voltage changed by the second period, And a common voltage corresponding to the smallest flicker value among the second minimum flicker values is finally set in the liquid crystal panel The common voltage value adjustment method is provided.

The first period is set to 0.01 seconds or more, and the second period is set to 0.04 seconds or more.

The common voltage regulating device and the regulating method of a liquid crystal display according to an exemplary embodiment of the present invention measure flicker while measuring not only all the sections of the common voltage sequentially but only a specific section or changing the common voltage at different periods Scheme, the common voltage generating the minimum flicker value can be set quickly.

1 is a configuration diagram of a common voltage regulating device of a liquid crystal display according to an embodiment of the present invention;
FIG. 2 is a first graph illustrating a process of adjusting a common voltage using the common voltage regulator of the liquid crystal display of FIG. 1;
3 is a first flowchart illustrating a process of adjusting a common voltage using the common voltage regulator of the liquid crystal display of FIG.
FIG. 4 is a second graph showing a process of adjusting the common voltage using the common voltage regulator of the liquid crystal display of FIG. 1;
5 is a second flowchart showing a process of adjusting a common voltage using the common voltage regulator of the liquid crystal display of FIG.
6 is a diagram showing a first calculation method for calculating a flicker value in the optical sensor unit of the common voltage regulating device of the liquid crystal display of FIG.
Fig. 7 is a diagram showing a second calculation method for calculating the flicker value in the optical sensor unit of the common voltage regulating device of the liquid crystal display device of Fig. 1; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention.

1 is a configuration diagram of a common voltage regulating device 1 of a liquid crystal display device according to an embodiment of the present invention.

The common voltage regulating device 1 of the liquid crystal display according to the present embodiment includes only a simple configuration for clearly explaining the technical idea to be proposed.

Referring to FIG. 1, a common voltage regulating device 1 of a liquid crystal display includes a liquid crystal panel 100, an optical sensor unit 200, and a common voltage setting unit 300.

The detailed configuration and main operation of the common voltage regulating device 1 of the liquid crystal display device constructed as above will be described below.

The optical sensor unit 200 measures a flicker of an image displayed on the liquid crystal panel 100 and calculates a flicker value F_ADC based on the measured flicker waveform. The flicker value F_ADC output from the optical sensor unit 200 is output in the form of a digital value, and a method for calculating the flicker value F_ADC based on the flicker waveform will be described later.

The common voltage setting unit 300 receives the flicker value F_ADC calculated by the optical sensor unit 200 and adjusts the common voltage V_COM of the liquid crystal panel. That is, the common voltage setting unit 300 sets the common voltage V_COM to the liquid crystal panel 100 after determining the common voltage V_COM corresponding to the minimum flicker value F_ADC.

FIG. 2 is a first graph showing a process of adjusting the common voltage using the common voltage regulating device 1 of the liquid crystal display device of FIG.

Referring to FIG. 2, a process of quickly setting a common voltage V_COM that can minimize a flicker in the common voltage setting unit 300 will be described in detail.

The common voltage setting unit 300 sequentially changes the common voltage V_COM. For reference, the common voltage V_COM may be changed so as to sequentially rise, and then to be sequentially lowered. In the present embodiment, an example in which the common voltage V_COM is changed so as to sequentially increase will be described.

When the common voltage V_COM is sequentially increased, the common voltage setting unit 300 stops changing the common voltage V_COM when the flicker value F_ADC gradually decreases and then increases to the minimum flicker value And the corresponding common voltage is finally set in the liquid crystal panel 100.

In other words, generally, when the common voltage V_COM is changed, the flicker value F_ADC decreases and there is only a single increase section. Therefore, when the flicker value F_ADC gradually decreases and an interval increases, It can be regarded that the flicker value F_ADC is calculated and the common voltage V_COM at that time is finally set in the liquid crystal panel 100. [

3 is a first flowchart illustrating a process of adjusting a common voltage using the common voltage regulator of the liquid crystal display of FIG.

Referring to FIG. 3, in the method of controlling the common voltage of the liquid crystal display, flicker of an image displayed on a liquid crystal panel is measured, and a common voltage of the liquid crystal panel is adjusted by calculating a flicker value based on the measured flicker waveform,

When the period in which the flicker value F_ADC gradually decreases while the common voltage V_COM is sequentially changed (increased or decreased) occurs, the change of the common voltage V_COM is stopped and a common The voltage V_COM is finally set in the liquid crystal panel 100. - S10, S20, S30 -

In this method, since not only all the sections of the common voltage V_COM are sequentially measured but only a specific section is measured, the common voltage generating the minimum flicker value can be set quickly.

FIG. 4 is a second graph illustrating a process of adjusting the common voltage using the common voltage regulating device 1 of the liquid crystal display device of FIG.

Referring to FIG. 4, a process of quickly setting a common voltage V_COM capable of minimizing a flicker in the common voltage setting unit 300 will be described in detail.

Generally, when the common voltage V_COM is changed, the flicker value F_ADC decreases, but there is only a single increase section. However, there may be a plurality of sections where the flicker value decreases and then increases.

4, when the flicker value decreases and there are two increasing sections, the common voltage setting unit 300 can quickly set the common voltage V_COM that can minimize the flicker .

The common voltage setting unit 300 sequentially changes the common voltage V_COM every first period T1. For reference, the common voltage V_COM may be changed so as to sequentially rise, and then to be sequentially lowered. In the present embodiment, an example in which the common voltage V_COM is changed so as to sequentially increase will be described.

When the common voltage setting unit 300 sequentially increases the common voltage V_COM every first period T1 and a period in which the flicker value F_ADC gradually decreases and then increases is generated, The common voltage V_COM is sequentially increased every second period T2 of the period longer than the period T1.

That is, in this embodiment, since the voltage of the common voltage V_COM increases as the period in which the common voltage V_COM is changed also increases in proportion to the period of the common voltage V_COM, When the common voltage V_COM is applied in units of the period T2, the total number of applied common voltages V_COM decreases.

For reference, the first period T1 may be set to 0.01 seconds or more, and the second period T2 may be set to 0.04 seconds or more, wherein the first period T1 is 0.01 second to 0.04 second, (T2) is most preferably set to 0.03 seconds to 0.08 seconds. That is, when the common voltage V_COM is changed every too long period, the time for calculating the flicker value F_ADC may be insufficient in the optical sensor unit 200, so that the first period T1 must be set to at least 0.01 seconds or more do.

The common voltage setting unit 300 sets the first minimum flicker value F_ADC1 by the common voltage changed every first period T1 and the second minimum flicker value F_ADC1 by the common voltage changed by the second period T2, Value F_ADC2.

In addition, the common voltage setting unit 300 finally sets the common voltage V_COM corresponding to the smallest flicker value among the first and second minimum flicker values to the liquid crystal panel 100.

FIG. 5 is a second flowchart showing a process of adjusting the common voltage using the common voltage regulating device 1 of the liquid crystal display of FIG.

Referring to FIG. 5, the common voltage control method of a liquid crystal display device measures a flicker of an image displayed on a liquid crystal panel, calculates a flicker value based on the measured flicker waveform,

When a period in which the flicker value gradually decreases while the common voltage V_COM is sequentially changed (increased or decreased) every first period T1 is generated, a period longer than the first period T1 (Increase or decrease) the common voltage V_COM sequentially every second period T2, and S40, S50, S60 -

The first minimum flicker value F_ADC1 by the common voltage changed every first period T1 is compared with the second minimum flicker value F_ADC2 by the common voltage changed by the second period, The common voltage V_COM corresponding to the smallest flicker value among the minimum flicker values is finally set in the liquid crystal panel 100. - S70 -

This method uses a method of measuring the flicker while changing the common voltage at different periods without measuring all the intervals of the common voltage V_COM in one period unit. Thus, the common voltage V_COM, which generates the minimum flicker value, Can be set quickly.

The common voltage setting unit 300 sets the common voltage V_COM of the liquid crystal panel 100 to the common voltage V_COM for every first period T1 by receiving the flicker value calculated by the optical sensor unit 200, If the period in which the flicker value gradually decreases while the voltage is sequentially changed (increased or decreased) is generated, the common voltage is increased every second period (T2) longer than the first period (T1) (Increment or decrement) sequentially,

As a result of comparison between the first minimum flicker value due to the common voltage changed every first period T1 and the second minimum flicker value due to the common voltage changed every second period T2, 1 If the minimum flicker value is closer than 80% to 90%

The flicker value is measured again while the common voltage V_COM is sequentially changed (increased or decreased) every first period T1 by measuring again the period in which the common voltage is changed every second period T2, The common voltage V_COM corresponding to the smallest flicker value among the second minimum flicker value and the flicker value measured again may be finally set in the liquid crystal panel 100. [

That is, in the common voltage adjusting method of a liquid crystal display, flicker of an image displayed on a liquid crystal panel is measured, and a common voltage of the liquid crystal panel is adjusted by calculating a flicker value based on the measured flicker waveform,

If a period in which the flicker value gradually decreases while the common voltage is sequentially changed (increased or decreased) every first period (T1) occurs, after the period, the second period of the period longer than the first period (Increases or decreases) the common voltage for every second period T2,

As a result of comparison between the first minimum flicker value due to the common voltage changed every first period T1 and the second minimum flicker value due to the common voltage changed every second period T2, 1 If the minimum flicker value is closer than 80% to 90%

The flicker value is measured again while the common voltage V_COM is sequentially changed (increased or decreased) every first period T1 by measuring again the period in which the common voltage is changed every second period T2, The second minimum flicker value, and the common voltage V_COM corresponding to the smallest flicker value among the flicker values measured again may be finally set in the liquid crystal panel 100.

On the other hand, when the first minimum flicker value by the common voltage changed every first period (T1) is compared with the second minimum flicker value by the common voltage changed by the second period (T2), the second minimum flicker value The common voltage V_COM corresponding to the smallest flicker value among the first and second minimum flicker values is finally set to the liquid crystal panel 100 do.

In this way, not only the common voltage V_COM corresponding to the minimum flicker value can be accurately detected, but also the optimum common voltage can be set quickly.

In addition, the common voltage setting unit 300 may sequentially change (increase or decrease) the common voltage for each sampling period in receiving the flicker value calculated by the optical sensor unit 200 and adjusting the common voltage of the liquid crystal panel 100, And the change of the flicker value is grasped,

When the common voltage is sequentially changed (increased or decreased) every first period (T1) shorter than the sampling period, the flicker value gradually decreases and then the rising period occurs , The change of the common voltage is stopped and the common voltage V_COM corresponding to the minimum flicker value is finally set in the liquid crystal panel 100,

If a plurality of sections having a decreasing flicker value are present,

When a period in which the flicker value gradually decreases while the common voltage V_COM is sequentially changed (increased or decreased) every first period T1 is generated, a period longer than the first period T1 (Increases or decreases) the common voltage V_COM sequentially every second period (T2) shorter than the sampling period,

As a result of comparison between the first minimum flicker value due to the common voltage changed every first period T1 and the second minimum flicker value due to the common voltage changed every second period T2, 1 If the minimum flicker value is closer than 80% to 90%

The period in which the common voltage V_COM is changed every second period T2 is measured again and the flicker value is measured again while sequentially changing (increasing or decreasing) the common voltage V_COM every first period T1, The common voltage V_COM corresponding to the smallest flicker value among the first and second minimum flicker values and the flicker value for the next measurement may be finally set in the liquid crystal panel 100.

That is, in the common voltage adjusting method of a liquid crystal display, flicker of an image displayed on a liquid crystal panel is measured, and a common voltage of the liquid crystal panel is adjusted by calculating a flicker value based on the measured flicker waveform,

The common voltage is sequentially changed (increased or decreased) every sampling period to grasp a change in the flicker value,

When the common voltage is sequentially changed (increased or decreased) every first period (T1) shorter than the sampling period, the flicker value gradually decreases and then the rising period occurs , The change of the common voltage is stopped and the common voltage V_COM corresponding to the minimum flicker value is finally set in the liquid crystal panel 100,

If a plurality of sections having a decreasing flicker value are present,

When a period in which the flicker value gradually decreases while the common voltage V_COM is sequentially changed (increased or decreased) every first period T1 is generated, a period longer than the first period T1 (Increases or decreases) the common voltage V_COM sequentially every second period (T2) shorter than the sampling period,

As a result of comparison between the first minimum flicker value due to the common voltage changed every first period T1 and the second minimum flicker value due to the common voltage changed every second period T2, 1 If the minimum flicker value is closer than 80% to 90%

The period in which the common voltage V_COM is changed every second period T2 is measured again and the flicker value is measured again while sequentially changing (increasing or decreasing) the common voltage V_COM every first period T1, And the common voltage V_COM corresponding to the smallest flicker value among the first and second minimum flicker values and the flicker value for the next measurement may be finally set in the liquid crystal panel 100. [

On the other hand, when the first minimum flicker value by the common voltage changed every first period (T1) is compared with the second minimum flicker value by the common voltage changed by the second period (T2), the second minimum flicker value The common voltage V_COM corresponding to the smallest flicker value among the first and second minimum flicker values is finally set to the liquid crystal panel 100 do.

In this way, not only the common voltage V_COM corresponding to the minimum flicker value can be accurately detected, but also the optimum common voltage can be set quickly.

FIG. 6 is a diagram showing a first calculation method for calculating the flicker value in the optical sensor unit 200 of the common voltage regulating device of the liquid crystal display of FIG. 1, and FIG. And a second calculation method for calculating the flicker value in the optical sensor unit 200 of the adjustment device.

6, when calculating the flicker value F_ADC based on the measured flicker waveform,

≪ Formula 1 >

Figure 112015068888682-pat00001

Figure 112015068888682-pat00002

The flicker value F_ADC is calculated according to Equation (1).

In the first calculation method, the time for calculating the flicker value F_ADC is fast, the amount of calculation is small, and a low pass filter is required.

7, when calculating the flicker value F_ADC based on the measured flicker waveform,

&Quot; (2) "

Figure 112015068888682-pat00003

Figure 112015068888682-pat00004

xdc: average value of the signal

The flicker value F_ADC is calculated by the equation (2).

The second calculation method requires a fast time to calculate the flicker value (F_ADC), a small amount of calculation, and a low pass filter.

The common voltage regulating device and the regulating method of a liquid crystal display according to an exemplary embodiment of the present invention measure flicker while measuring not only all the sections of the common voltage sequentially but only a specific section or changing the common voltage at different periods Scheme, the common voltage generating the minimum flicker value can be set quickly.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: liquid crystal panel
200: Optical sensor unit
300: Common voltage setting unit

Claims (6)

delete An optical sensor unit for measuring a flicker of an image displayed on the liquid crystal panel and calculating a flicker value based on the measured flicker waveform; And
Wherein the common voltage of the liquid crystal panel is adjusted by receiving the flicker value calculated by the optical sensor unit, and when the common voltage is sequentially changed (increased or decreased) every first period, the flicker value gradually decreases, , The common voltage is sequentially changed (increased or decreased) every second period of the period longer than the first period after the period,
Wherein the second minimum flicker value is a value obtained by comparing the first minimum flicker value by the common voltage changed every first period and the second minimum flicker value by the common voltage changed by the second period, 1 If the minimum flicker value is closer than 80% to 90%
The common voltage is changed again (incremented or decremented) for each of the first periods, and the flicker value is measured again, and the first and second minimum flicker A common voltage setting unit for finally setting a common voltage corresponding to the smallest flicker value among the flicker values at the time of measurement again to the liquid crystal panel;
And the common voltage regulator of the liquid crystal display device.
3. The method of claim 2,
Wherein the first period is set to 0.01 seconds or more, and the second period is set to 0.04 seconds or more.
delete A method of measuring a flicker of an image displayed on a liquid crystal panel and calculating a flicker value based on the measured flicker waveform to adjust a common voltage of the liquid crystal panel,
When the common voltage is sequentially changed (increased or decreased) every first period, if the flicker value gradually decreases and then the rising period occurs, after the period, the common voltage (Increase or decrease) sequentially,
Wherein the second minimum flicker value is a value obtained by comparing the first minimum flicker value by the common voltage changed every first period and the second minimum flicker value by the common voltage changed by the second period, 1 If the minimum flicker value is closer than 80% to 90%
The common voltage is changed again (incremented or decremented) for each of the first periods, and the flicker value is measured again, and the first and second minimum flicker And a common voltage corresponding to the smallest flicker value among the flicker values for the next measurement is finally set in the liquid crystal panel.
6. The method of claim 5,
Wherein the first period is set to 0.01 seconds or more, and the second period is set to 0.04 seconds or more.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114203125A (en) * 2021-12-07 2022-03-18 昆山龙腾光电股份有限公司 Method and device for acquiring common voltage and computer storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070099825A (en) * 2006-04-05 2007-10-10 삼성전자주식회사 Method of extracting optimized dvr value and extracting device using the same
KR20080097554A (en) * 2007-05-02 2008-11-06 삼성전자주식회사 Method for tuning flicker, tuning circuit for performing the same and display device having the tuning circuit
KR20080105595A (en) * 2007-05-31 2008-12-04 삼성전자주식회사 Apparatus for setting a common voltage and method of setting the common voltage
JP2010145811A (en) * 2008-12-19 2010-07-01 Epson Imaging Devices Corp Liquid crystal device, electro-optical device, and driving method of liquid crystal device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070099825A (en) * 2006-04-05 2007-10-10 삼성전자주식회사 Method of extracting optimized dvr value and extracting device using the same
KR20080097554A (en) * 2007-05-02 2008-11-06 삼성전자주식회사 Method for tuning flicker, tuning circuit for performing the same and display device having the tuning circuit
KR20080105595A (en) * 2007-05-31 2008-12-04 삼성전자주식회사 Apparatus for setting a common voltage and method of setting the common voltage
JP2010145811A (en) * 2008-12-19 2010-07-01 Epson Imaging Devices Corp Liquid crystal device, electro-optical device, and driving method of liquid crystal device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114203125A (en) * 2021-12-07 2022-03-18 昆山龙腾光电股份有限公司 Method and device for acquiring common voltage and computer storage medium

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