KR20080112500A - Method and apparatus for compensating flicker level - Google Patents

Method and apparatus for compensating flicker level Download PDF

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Publication number
KR20080112500A
KR20080112500A KR1020070060996A KR20070060996A KR20080112500A KR 20080112500 A KR20080112500 A KR 20080112500A KR 1020070060996 A KR1020070060996 A KR 1020070060996A KR 20070060996 A KR20070060996 A KR 20070060996A KR 20080112500 A KR20080112500 A KR 20080112500A
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KR
South Korea
Prior art keywords
value
flicker
comparison table
driver
reference value
Prior art date
Application number
KR1020070060996A
Other languages
Korean (ko)
Inventor
김태환
Original Assignee
엘지이노텍 주식회사
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Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070060996A priority Critical patent/KR20080112500A/en
Publication of KR20080112500A publication Critical patent/KR20080112500A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13454—Drivers integrated on the active matrix substrate
    • 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
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The present invention relates to a flicker level correction method and apparatus. According to the present invention, when a flicker signal having a predetermined level is input to the driver IC, the flicker level value is compared with a reference value of a comparison table stored in the driver IC. As a result of the comparison, if the flicker signal value and the reference value of the comparison table are not the same, the step in the comparison table is increased or decreased. As a result of the comparison, if the flicker signal value and the reference value of the comparison table are the same, the corresponding step value in the comparison table is written to the EEPROM to initialize the module.

Description

Flicker level correction method and apparatus {Method and apparatus for compensating flicker level}

1 is an internal configuration diagram of a flicker level correction device of the present invention.

2 is a flowchart illustrating a flicker level correction process of the present invention.

<Explanation of symbols on main parts of the drawings>

100-Flicker Level Correction Unit 103-Frequency Analyzer

106-Driver IC 109-Display Unit

The present invention relates to a flicker level correction method and apparatus.

Recently, as the personal computer has become lighter and thinner as a TV, the display device is also required to be lighter and thinner, and a flat panel display such as a liquid crystal display (LCD) is being developed instead of a cathode ray tube (CRT). It is being used in various fields.

An LCD is a display device that obtains a desired image signal by applying an electric field to a liquid crystal material having an anisotropic dielectric constant injected between two substrates, and controlling the amount of light transmitted through the substrate by adjusting the intensity of the electric field. Such LCDs are typical among portable panel displays that are easy to carry. Among them, TFT-LCDs using thin film transistors as switching elements are mainly used.

In general, an LCD includes a plurality of gate lines for transmitting a scan signal and data lines formed to intersect the gate lines and for transmitting image data, and are formed in an area surrounded by the gate lines and the data lines, respectively, and are connected to the gate lines and the data lines, respectively. It includes a plurality of pixels in the form of a matrix connected through the device.

In applying image data in such LCDs, there is a problem in that flicker occurs due to variations in electrodes of panels or variations in LDIs. To compensate for this problem, the inspector directly controls the LCD tester equipment by module to reset the output level or by applying a separate element on the LCD module circuit to adjust the flicker level to the minimum level for each LCD module. Although the output of the IC is controlled, there is a part that cannot be quantified due to emotional deviation between inspectors, and there is a problem in that correction is difficult when the control element is located on the rear surface of the panel.

An object of the present invention is to provide a flicker level correction method and apparatus capable of improving image quality by correcting flicker level using an LCD driver IC.

In the present invention, when a flicker signal of a predetermined level is input to the driver IC, the flicker level value is compared with a reference value of a comparison table stored in the driver IC. As a result of the comparison, if the flicker signal value and the reference value of the comparison table are not the same, the step in the comparison table is increased or decreased. As a result of the comparison, if the flicker signal value and the reference value of the comparison table are the same, the corresponding step value in the comparison table is written to the EEPROM to initialize the module.

In addition, the flicker level correction apparatus of the present invention analyzes frequency components from a plurality of frequencies or mixed voices and signals and outputs them in a specific format, and when the flicker signal of a predetermined level is input, the flicker level value is stored and compared. Compared with the reference value of the table, if the flicker signal value and the reference value of the comparison table are not the same, the step in the comparison table is increased or decreased, and if the flicker signal value and the reference value of the comparison table are the same, the corresponding value in the comparison table is A driver IC for initializing the module by writing the step value to the EEPROM, and a display unit for displaying the corrected signal value received from the driver IC. In this case, the driver IC may reconfirm the result after initializing the module through the last flicker pattern.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an internal configuration diagram of a flicker level correction device of the present invention.

The flicker level correction device 100 of the present invention includes a frequency analyzer 103, a driver IC 106, and a display unit 109.

The frequency analyzer 103 analyzes frequency components from a voice or a signal in which a plurality of frequencies are mixed and outputs them in a specific format. In particular, the frequency analyzer 103 is required to evaluate the image quality of the panel by measuring the degree of vibration when driving a specific pattern of the display unit 109.

When a certain level of flicker signal is input from the frequency analyzer 103, the driver IC 106 compares the reference value of the stored comparison table. As a result of comparison with the value of the comparison table, if the flicker level signal value and the reference value are not the same, the step in the comparison table is increased or decreased. As a result of comparing with the value of the comparison table, if the flicker level signal value and the reference value are the same, the module is initialized by writing the value of the corresponding step of the comparison table to the EEPROM.

In addition, the driver IC 106 reconfirms the result after initializing the module through the last flicker pattern. That is, when the flicker signal of a certain level is input to the driver IC, the input flicker level value is compared with the reference value of the comparison table stored in the driver IC. If the comparison result, the flicker signal value and the reference value of the comparison table are not the same In this case, the process of initializing the module is repeated by increasing or decreasing the steps in the comparison table and writing the value of the corresponding step in the comparison table to the EEPROM.

The display unit 109 displays the corrected signal value received from the driver IC 106.

Next, a process of correcting the flicker level in the flicker level correcting apparatus of the present invention will be described.

2 is a flowchart illustrating a flicker level correction process of the present invention.

When the flicker signal having a predetermined level is input to the driver IC (S201), the input flicker level value is compared with the reference value of the comparison table stored in the driver IC (S203). It is determined whether the input flicker level value is the same as the comparison value of the comparison table, and if the comparison result is that the flicker signal value and the reference value of the comparison table are not the same (No in S203), the step in the comparison table is increased or Reduce (S207). After step S207 is repeated again step S203.

As a result of the comparison, if the flicker signal value and the reference value of the comparison table are the same (YES in S203), the corresponding step value in the comparison table is written to the EEPROM to initialize the module (S205).

As mentioned above, although this invention was demonstrated to the several example, this invention is not limited to a specific Example. Those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit of the invention.

The present invention has the effect of improving the image quality by correcting the input flicker level by adding the existing I / O terminal or a separate terminal to the LCD driver IC.

Claims (3)

A first step of inputting a flicker signal of a predetermined level to the driver IC; A second step of comparing the input flicker level value with a reference value of a comparison table stored in the driver IC; A third step of increasing or decreasing the steps in the comparison table and repeating the second step if the flicker signal value and the reference value of the comparison table are not equal to each other; As a result of the comparison, if the flicker signal value and the reference value of the comparison table are the same, a fourth step of initializing the module by writing the corresponding step value in the comparison table to the EEPROM Flicker level correction method comprising a. A frequency analyzer for analyzing frequency components from a plurality of frequencies or mixed voices and outputting the signals in a specific format; When a flicker signal of a predetermined level is input, the flicker level value is compared with the reference value of the stored comparison table, and if the flicker signal value and the reference value of the comparison table are not the same, the step in the comparison table is increased or decreased, and the flicker signal is increased. A driver IC for initializing the module by writing the corresponding step value in the comparison table to the EEPROM if the value and the reference value of the comparison table are the same; A display unit for displaying the corrected signal value received from the driver IC, Flicker level correction device comprising a. The method of claim 2, And the driver IC reconfirms the result after initializing the module through the last flicker pattern.
KR1020070060996A 2007-06-21 2007-06-21 Method and apparatus for compensating flicker level KR20080112500A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070060996A KR20080112500A (en) 2007-06-21 2007-06-21 Method and apparatus for compensating flicker level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070060996A KR20080112500A (en) 2007-06-21 2007-06-21 Method and apparatus for compensating flicker level

Publications (1)

Publication Number Publication Date
KR20080112500A true KR20080112500A (en) 2008-12-26

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KR1020070060996A KR20080112500A (en) 2007-06-21 2007-06-21 Method and apparatus for compensating flicker level

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9251756B2 (en) 2013-04-11 2016-02-02 Samsung Display Co., Ltd. Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9251756B2 (en) 2013-04-11 2016-02-02 Samsung Display Co., Ltd. Display device

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