KR20080103240A - Liquid crystal display device and driving method of the same - Google Patents

Liquid crystal display device and driving method of the same Download PDF

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Publication number
KR20080103240A
KR20080103240A KR1020070050289A KR20070050289A KR20080103240A KR 20080103240 A KR20080103240 A KR 20080103240A KR 1020070050289 A KR1020070050289 A KR 1020070050289A KR 20070050289 A KR20070050289 A KR 20070050289A KR 20080103240 A KR20080103240 A KR 20080103240A
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KR
South Korea
Prior art keywords
signal
display mode
interface
liquid crystal
video signal
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Application number
KR1020070050289A
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Korean (ko)
Inventor
남승석
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020070050289A priority Critical patent/KR20080103240A/en
Publication of KR20080103240A publication Critical patent/KR20080103240A/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G09F9/3023—Segmented electronic displays
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/017509—Interface arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0259—Details of the generation of driving signals with use of an analog or digital ramp generator in the column driver or in the pixel circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/08—Details of image data interface between the display device controller and the data line driver circuit

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A liquid crystal display device and driving method is provide to operates the liquid crystal panel to the dual display mode by determining the input or not of the video signal of the analog signal type from the graphics card. An input unit inputs the first and the second image signal according to the display mode which is set up from outside or inputs one image signal of them. A first interface(112) generates display mode control signal having the different logical value by detecting the input or not of the first video signal among the video signal supplied from the input unit and converts the first video signal into data format for the half screen in case that first video signal is detected. A second interface(114) receives the second image signal and converts the second image data format into the full screen data or half screen data according to the display mode control signal which is generated from the first interface.

Description

Liquid crystal display device and driving method of the same

1 is a view showing a liquid crystal display device according to the present invention.

2 is a flow chart showing an operation procedure of the first interface of FIG.

3 is a flow chart showing an operation procedure of the second interface of FIG.

<Brief description of the main parts of the drawing>

102: liquid crystal panel 104: gate driver

106a, 106b: First and second data drivers

108: timing controller 110: selection

112, 114: First and second interface 116: Graphics card

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a driving method thereof capable of implementing a dual mode.

The monitor of the liquid crystal display device having a digital interface has a merit that can greatly save the installation space, compared to the monitor of the cathode ray tube (CRT), the user is increasing a lot. Since the monitor of the liquid crystal display device can use digital data output from a computer as it is, there is no signal loss and image quality is excellent.

However, most cathode ray tube (CRT) monitors operate in an analog manner. To this end, most graphics cards convert digital data from a computer into analog and supply them to the monitor side. Accordingly, the monitor of the liquid crystal display device is provided with a dual interface capable of supporting both a digital interface and an analog interface, making it compatible with the graphics card. The dual interface may include a DVI (Digital Visual Interface) interface, and the LCD monitor having a DVI connector supporting the DVI interface may receive and process both an analog video signal and a digital video signal. Therefore, the user can preset the display mode of the monitor of the liquid crystal display device according to the type of the graphics card, so that the monitor of the liquid crystal display device can be used in one of the analog mode and the digital mode. The monitor of the display device operates in the default mode.

On the other hand, in the configuration between the graphics card and the monitor, the use of a plurality of monitors through the output of a plurality of video signals from a single graphics card is called a dual monitor system. It displays multiple screens on the monitor and executes various programs to compare and analyze each other, and simultaneously perform input and edit operations.

The dual monitor system includes a plurality of display panels that are physically separated from each other, and when one image is displayed over the plurality of display panels, there is a problem in that continuity of the images is broken. In addition, when the user sees an image displayed on one display panel among the plurality of display panels and performs a graphic work on the remaining display panels, work is troublesome because the work is alternately performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device and a driving method thereof capable of implementing a dual mode with one display panel capable of improving work efficiency.

The liquid crystal display according to the present invention for achieving the above object is an input unit for inputting both the first and second video signals or only one of the first and second video signals according to the display mode set from the outside And detecting whether the first video signal is input from the video signal supplied from the input unit, generating a display mode control signal having a different logic value according to the detection result, and when there is an input of the first video signal. A first interface for converting a first video signal into a half screen data format; and receiving a second video signal from the input unit, according to a display mode control signal generated from the first interface. The data format can be one of the data formats for half screen and data formats for full screen. And a second interface, and a liquid crystal panel in which an image is displayed corresponding to the conversion data from the first and second interface for converting the format.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display device, the method comprising: inputting at least one video signal among first and second video signals; Detecting the presence of an input and converting one of the first and second image signals into a half screen data format and full screen according to a result of detecting the presence of the first image signal. And converting the converted video signal into a liquid crystal data format, supplying the converted video signal to the liquid crystal panel, and displaying an image corresponding to the video signal supplied to the liquid crystal panel.

Other objects, other features and other advantages of the present invention in addition to the above objects will become apparent from the detailed description of the embodiments associated with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail in conjunction with the accompanying drawings.

1 is a view showing a liquid crystal display device according to the present invention.

As shown in FIG. 1, a liquid crystal display according to the present invention is configured to drive a liquid crystal panel 102 divided into first and second regions A and B and a gate line of the liquid crystal panel 102. A gate driver 104, first and second data drivers 106a and 106b for driving data lines of the liquid crystal panel 102, the gate driver 104 and the first and second data drivers 106a , Timing controller 108 for controlling 106b, graphics card 116 for outputting first and second video signals, and a first interface for processing the first video signal output from the graphics card 116. And a second interface 114 for processing a second video signal output from the graphics card 116 and a logic value of a display mode control signal supplied from the second interface 114. First supplied from the first and second interfaces 112 and 114, respectively And a selector 110 for selecting one of the first and second video signals and supplying the video signal to the second data driver 106b.

The liquid crystal panel 102 includes pixels formed in regions divided by a plurality of gate lines and a plurality of data lines, respectively. Each of the pixels includes a thin film transistor TFT formed at an intersection between a corresponding gate line and a corresponding data line, and a liquid crystal cell Clc connected between the thin film transistor TFT and the common electrode Vcom electrode. do.

The thin film transistor TFT switches the pixel data voltage to be supplied to the corresponding liquid crystal cell Clc from the corresponding data line DL in response to a gate scan signal on the corresponding gate line GL. The liquid crystal cell Clc includes a common electrode facing each other with a liquid crystal layer interposed therebetween, and a pixel electrode connected to the thin film transistor TFT. The liquid crystal cell Clc charges the pixel data voltage supplied via the corresponding thin film transistor TFT. In addition, the voltage charged in the liquid crystal cell Clc is updated every time the corresponding thin film transistor TFT is turned on.

In addition, each of the pixels on the liquid crystal panel 102 includes a storage capacitor Cst connected between the thin film transistor TFT and the previous gate line. The storage capacitor Cst minimizes a natural decrease in the voltage charged in the liquid crystal cell Clc.

The gate driver 104 correspondingly supplies a plurality of gate scan signals to a plurality of gate lines in response to gate control signals GCS from the timing controller 108. These multiple gate scan signals allow the multiple gate lines to be enabled sequentially for one horizontal synchronization signal.

The first data driver 106a responds to the data control signal DCS from the timing controller 108 so that each time one of the gate lines is enabled, the first interface 112 is activated. The pixel data voltage is supplied to the plurality of data lines positioned on the first display area A of the liquid crystal panel 102 by converting the data supplied from the plurality of pixel data voltages.

In response to the data control signal DCS from the timing controller 108, the second data driver 106b may select from the selection unit 110 whenever one of the gate lines of the plurality of gate lines is enabled. The pixel data voltages are respectively supplied to a plurality of data lines on the second display area B of the liquid crystal panel 102 by converting the supplied data into a plurality of pixel data voltages.

The timing controller 108 may include a data clock signal DCLK, a horizontal synchronization signal Hsync, and a vertical synchronization signal from an external system (for example, a graphic module of a computer system or an image demodulation module of a television receiving system). The gate control signals GCS and the data control signals DCS are generated using the signal Vsync and the data enable signal DE. The gate control signals GCS are supplied to the gate driver 104, and the data control signals DCS are supplied to the first and second data drivers 106a and 106b, respectively.

The graphics card 116 reads the monitor information data EDID (Extended Display Identification Data) of the liquid crystal panel 102 from the first and second interfaces 112 and 114 to change the display mode of the liquid crystal panel 102. After the determination, first and second image signals are supplied to the first and second interfaces 112 and 114, respectively.

For example, when the user sets the display mode of the liquid crystal panel 102 to the dual display mode from the outside, the first and second interfaces 112 and 114 are connected to the graphic card 116 to the liquid crystal panel 102. The monitor information data EDID indicates that) is driven in the dual display mode. Accordingly, the graphic card 116 supplies a first video signal to the first interface 112 and a second video signal to the second interface 114. In this case, the first video signal is a digital signal, and the second video signal is an analog signal.

In addition, when the user sets the display mode of the liquid crystal panel 102 to the single display mode from the outside, the first interface 112 is connected to the graphic card 116 and the liquid crystal panel 102 is in the single display mode. The monitor information data EDID informs that it is driven. Accordingly, the graphic card 116 supplies the first image signal, which is a digital signal, to the first interface 112. As a result, the graphic card 116 supplies the first and second image signals to the first and second interfaces 112 and 114 according to the display mode of the liquid crystal panel 102 preset by the user. The first image signal is supplied only to the first interface 112.

The first interface 112 converts the data format of the first video signal supplied from the graphics card 116 according to a logic value of the display mode control signal supplied from the second interface 114. Specifically, when the display mode control signal supplied from the second interface 114 is a specific logic (for example, High), the first interface 112 may include a first image supplied from the graphic card 116. Convert the data format of the signal to a half screen data format. The first interface 112 supplies the converted half screen data format to the first data driver 106a and the selector 110. The half screen data supplied to the first data driver 106a is displayed as a corresponding image on the first display area A of the liquid crystal panel 102.

The first interface 112 is the data of the first image signal supplied from the graphics card 116 when the display mode control signal supplied from the second interface 114 is the base logic (for example, Low). Convert the format to the data format for full screen. The first interface 112 supplies the converted full screen data format to the first data driver 106a and the selector 110.

The full screen data supplied to the first data driver 106a is displayed as a corresponding image on the first and second display areas A and B of the liquid crystal panel 102.

The second interface 114 detects whether or not a second video signal is input from the graphic card 116 according to a display mode set by an external user and controls the display mode having different logic values according to the detection result. Generate a signal. The display mode control signal is supplied to the first interface 112 and the selector 110.

Specifically, when the user sets the dual display mode, the second interface 114 informs the graphics card 116 of the set dual display mode through the monitor information data EDID. In this case, the graphics card 116 supplies a second video signal to the second interface 114. When the second image signal is input from the graphic card 116, the second interface 114 generates a display mode control signal of a specific logic to generate the selection unit 110 and the first interface 112. The display mode control signal of the specific logic High is supplied.

When the display mode control signal of the specific logic High is inputted to the first interface 112, the first interface 112 inputs the first image signal input from the graphics card 116 as described above. Convert to half screen data format. The second interface 114 converts the second video signal into a half screen data format when a second video signal is input from the graphic card 116. The half screen data converted by the second interface 114 is supplied to the selector 110.

On the contrary, when the user sets the display mode of the liquid crystal panel 102 to the single display mode, the second interface 114 sets the set single display mode to the graphics card 116 via the monitor information data EDID. To tell. In this case, the graphic card 116 does not supply the second video signal, which is the analog signal, to the second interface 114.

When the user sets the display mode of the liquid crystal panel 102 to the dual display mode, the selector 110 may select a half screen data format from each of the first and second interfaces 112 and 114. You are provided with the converted data. In addition, the selector 110 may select any one of data supplied from the first and second interfaces 112 and 114 according to a logic value of the display mode control signal supplied from the second interface 114. Select. The data selected by the selector 110 is supplied to the second data driver 106b.

Specifically, when the display mode control signal having a specific logic (High) is supplied from the second interface 114, the selector 110 receives half screen data supplied from the second interface 114. Selectively, the second data driver 106b supplies data for the selected half screen. The data supplied to the second data driver 106b is displayed as an image on the second display area B of the liquid crystal panel 102. In contrast, when the display mode control signal of the base logic Low is supplied from the second interface 114, the selector 110 receives data for half screen supplied from the first interface 114. Selects and supplies the selected data to the second data driver 106b. The data supplied to the second data driver 106b is displayed as an image on the second display area B of the liquid crystal panel 102.

When the user sets the display mode of the liquid crystal panel 102 to the dual display mode, the selector 110 displays the half screen data supplied from the second interface 114 in the second data driver. An image corresponding to the data is displayed on the second display area B of the liquid crystal panel 102 by supplying it to 106b. When the user sets the display mode of the liquid crystal panel 102 to the single display mode, the selector 110 may convert the half screen data supplied from the first interface 112 into the second data driver. An image corresponding to the data is displayed on the second display area B of the liquid crystal panel 102 by supplying it to 106b.

As a result, when the user sets the display mode of the liquid crystal panel 102 to the dual display mode, the half screen supplied from the first interface 112 is provided on the first display area A of the liquid crystal panel 102. An image corresponding to screen data is displayed, and an image corresponding to half screen data supplied from the second interface 114 is displayed on the second display area B of the liquid crystal panel 102. Is displayed. When the user sets the display mode of the liquid crystal panel 102 to a single display mode, the pull supplied from the first interface 112 is provided on the first and second display areas A and B of the liquid crystal panel 102. An image corresponding to data for a full screen is displayed.

The liquid crystal display according to the present invention can drive the liquid crystal panel in the dual display mode or in the single display mode by determining whether an image signal in the form of an analog signal is input from the graphic card. The liquid crystal display according to the present invention may use a single liquid crystal panel in a dual display mode or a single display mode in some cases, thereby allowing a user to efficiently perform a task. In addition, the liquid crystal display market value according to the present invention can perform a seamless dual monitor function of the image.

Meanwhile, the second interface 114 determines whether the second video signal is input from the graphics card 116 and generates a display mode control signal having a different logic value according to the determination result. An input detector may be provided to perform the above function. That is, it detects whether a separate video signal input detector inputs the second video signal from the graphic card 116 to the second interface 114 and generates a display mode control signal having a different logic value according to the result. can do.

FIG. 2 is a flowchart illustrating an operation procedure of the first interface of FIG. 1.

As shown in FIGS. 1 and 2, the first interface 112 determines whether there is an input of a display mode control signal from the second interface 114 shown in FIG. 1. In particular, it is determined whether the display mode control signal of the base logic Low is input from the second interface 114. When the display mode control signal of the low logic is input from the second interface 114, the first interface 112 is a first image signal supplied from the graphics card 116 shown in FIG. Convert to data format for full screen. The full screen data converted by the first interface 112 is output to the first data driver 106a and the selector 110 illustrated in FIG. 1. At this time, since the display mode control signal of the base logic (Low) is input to the selector 110, the selector 110 receives the full screen data supplied from the first interface 112. Choose. As a result, the full screen data converted by the first interface 112 is displayed as an image on the first and second display areas A and B of the liquid crystal panel 102.

On the contrary, when the display mode control signal of a specific logic High is input from the second interface 114 rather than the display mode control signal of the low logic, the first interface 112 is illustrated in FIG. 1. The first video signal supplied from the graphics card 116 is converted into a half screen data format. The first interface 112 outputs the half screen data to the first data driver 106a and the selector 110. In this case, since the display mode control signal of the specific logic (High) is input to the selector 110, the selector 110 is a half screen supplied from the second interface illustrated in FIG. 1 (114 of FIG. 1). The data for half screen is selected and the selected data is output to the corresponding second data driver 106b.

3 is a flowchart illustrating an operation procedure of the second interface of FIG. 1.

1 and 3, the second interface 114 determines whether a second video signal is input from the graphic card 116 shown in FIG. 1. When there is no input of the second video signal from the graphics card 116, the second interface 114 generates a display mode control signal of low logic.

On the contrary, when the second video signal is input from the graphic card 116, the second interface 114 generates a display mode control signal having a specific logic (High). In addition, the second interface 114 converts the second video signal input from the graphics card 116 into a half screen data format. The second interface 114 outputs half screen data to the selection unit 110 of FIG. 1. In this case, since a display logic control signal having a specific logic (High) is input to the selector 110, the selector 110 selects half screen data output from the second interface 114. To output the data to the corresponding second data driver 106b. The second data driver 106b supplies data input from the selection unit 110 to data lines arranged on the second display area B of the liquid crystal panel 102 of FIG. 1. . As a result, an image corresponding to the data is displayed in the second display area B of the liquid crystal panel 102.

The liquid crystal display according to the present invention can drive the liquid crystal panel in the dual display mode or in the single display mode by determining whether an image signal in the form of an analog signal is input from the graphic card. The liquid crystal display according to the present invention may use a single liquid crystal panel in a dual display mode or a single display mode in some cases, thereby allowing a user to efficiently perform a task. In addition, the liquid crystal display according to the present invention may perform a dual monitor function without interruption of an image.

As described above, the liquid crystal display device according to the present invention is the liquid crystal display device according to the present invention determines whether the video signal in the form of an analog signal from the graphics card to drive the liquid crystal panel in dual display mode or single display mode can do.

Accordingly, the liquid crystal display device according to the present invention may use a single liquid crystal panel in a dual display mode or a single display mode in some cases, thereby allowing a user to efficiently perform the operation.

In addition, the liquid crystal display according to the present invention may perform a dual monitor function without interruption of an image.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but those skilled in the art to which the present invention pertains various modifications without departing from the spirit and scope of the present invention. It will be apparent that other variations and equivalent embodiments are possible.

Claims (10)

An input unit for inputting both the first and second video signals or only one of the first and second video signals according to a display mode set from the outside; Detects whether the first image signal is input from the image signal supplied from the input unit, generates a display mode control signal having a different logic value according to the detection result, and when there is an input of the first image signal, the first image A first interface for converting the signal into a half screen data format; The second video signal is received from the input unit and the data format of the second video signal is converted into a half screen data format and a full screen data according to a display mode control signal generated from the first interface. A second interface for converting to one of the data formats; And And a liquid crystal panel displaying an image corresponding to data converted from the first and second interfaces. The method of claim 1, And selecting one of data converted from the first and second interfaces and supplying the selected data to the liquid crystal panel according to a logic value of the display mode control signal generated in the first interface. LCD display device. The method of claim 1, And the first image signal is an analog signal, and the second image signal is a digital signal. The method of claim 1, And the input unit provides the first and second image signals to the first and second interfaces, respectively, when the user sets the display mode of the liquid crystal panel to the dual display mode. The method of claim 4, wherein And the first interface generates a display mode control signal having a specific logic when a first video signal is input. The method of claim 1, And the input unit provides a second image signal to the second interface when the user sets the display mode of the liquid crystal panel to the single display mode. The method of claim 6, And the first interface generates a display mode control signal of low logic when the first video signal is not input from the input unit. Inputting at least one video signal of the first and second video signals; Detecting the presence or absence of a first video signal among the at least one video signal; Converting one video signal of the first and second video signals into a half screen data format and a full screen data format according to a result of detecting whether the first video signal is input; Supplying the converted video signal to a liquid crystal panel; And And displaying an image corresponding to the image signal supplied to the liquid crystal panel. The method of claim 8, Wherein the first image signal is an analog signal, and the second image signal is a digital signal. The method of claim 8, Detecting whether the first image signal is input, And generating a display mode control signal of a specific logic when the first video signal is input, and generating a display mode control signal of the basic logic when the first video signal is not input. Driving method.
KR1020070050289A 2007-05-23 2007-05-23 Liquid crystal display device and driving method of the same KR20080103240A (en)

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