KR20090001272A - Display device and method of driving the same - Google Patents

Display device and method of driving the same Download PDF

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Publication number
KR20090001272A
KR20090001272A KR1020070065518A KR20070065518A KR20090001272A KR 20090001272 A KR20090001272 A KR 20090001272A KR 1020070065518 A KR1020070065518 A KR 1020070065518A KR 20070065518 A KR20070065518 A KR 20070065518A KR 20090001272 A KR20090001272 A KR 20090001272A
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KR
South Korea
Prior art keywords
liquid crystal
spread spectrum
crystal display
spread
control signal
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KR1020070065518A
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Korean (ko)
Inventor
상우규
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엘지디스플레이 주식회사
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Priority to KR1020070065518A priority Critical patent/KR20090001272A/en
Publication of KR20090001272A publication Critical patent/KR20090001272A/en

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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

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

Abstract

A display device and a method of driving the same are provided to apply the same spreading rate to a spread spectrum IC for a TV and a read spectrum IC for a liquid crystal display apparatus, thereby preventing a defect on a screen. A TV set(200) comprises a spread spectrum IC(220) for a TV. The spread spectrum IC for a TV generates a control signal for controlling the diffusion rate of a frequency. A liquid crystal display apparatus(160) comprises a spread spectrum IC(Integrated Circuit)(110) for a liquid crystal display apparatus. The spread spectrum IC(Integrated Circuit) for a liquid crystal display apparatus defines a spread rate of the liquid crystal display apparatus by receiving a control signal of the spread spectrum IC for a TV. The spread spectrum IC for a TV comprises a spreading rate control unit(222). The spreading rate control unit sets the spreading rate according to the control signal.

Description

DISPLAY DEVICE AND METHOD OF DRIVING THE SAME}

1 is a block diagram of a liquid crystal display and a TV SET according to the present invention.

FIG. 2 is a diagram for describing a spread spectrum IC of each of the liquid crystal display and the TV SET shown in FIG. 1.

FIG. 3 is a circuit diagram illustrating a spreading rate control unit of the spread spectrum IC for TV shown in FIG. 2.

<Explanation of symbols for the main parts of the drawings>

100: timing controller 102202: connector

110,220: spread spectrum IC 112: control signal generator

114: second modulator 130: data driver

140: gate driver 150: liquid crystal display panel

160: liquid crystal display 200: TV SET

210: set board 222: diffusion rate control unit

224: first modulator 232, 234: voltage divider

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device and a driving method thereof capable of reducing electromagnetic interference and preventing screen defects.

A liquid crystal display device displays an image by adjusting the light transmittance of a liquid crystal having dielectric anisotropy using an electric field. To this end, the liquid crystal display includes a liquid crystal display panel in which pixel regions are arranged in a matrix, and a driving circuit for driving the liquid crystal display panel.

In the display area of the liquid crystal display panel, a plurality of gate lines and a plurality of data lines are arranged perpendicularly to each other to define a pixel area. The thin film transistor formed at a portion where each gate line and the data line cross each other is turned on according to the scan signal of the gate line to apply the data signal of the data line to the pixel electrode of each pixel region.

The driving circuit includes a gate driver for driving the gate lines of the liquid crystal display panel, a data driver for driving the data lines, a timing controller for controlling the driving timing of the gate driver and the data driver, and a drive for driving the liquid crystal display panel and the driver. And a power supply for supplying necessary power signals.

In this case, the timing controller may use various control signals using a dot clock spread according to a spread spectrum method to reduce electromagnetic interference (EMI) between various control signals and pixel data signals transmitted to the gate driver and the data driver. Will generate them.

The liquid crystal display may be used for various purposes. In particular, an LCD TV may be realized by connecting a liquid crystal display and a TV SET through a connector. In this case, in order to reduce the EMI of the liquid crystal display device, the spread spectrum IC for the liquid crystal display device is incorporated in the liquid crystal display device, and the TV spectrum IC is provided with the TV spectrum IC for reducing the EMI of the TV SET. Here, the diffusion rate due to the EMI of the liquid crystal display device and the diffusion rate due to the EMI of the TV are different from each other. In other words, LCD TVs display screen defects due to excessive diffusion rate by applying the diffusion rate of the spread spectrum IC for the liquid crystal display device and the diffusion rate of the TV spread spectrum IC differently.

The present invention has been made to solve the above problems, and to provide a display device and a driving method thereof that can reduce electromagnetic interference of the display device and prevent screen defects.

In order to achieve the above technical problem, a display device according to the present invention includes a TV SET having a spread spectrum IC for TV generating a control signal for controlling the spreading ratio of frequencies; And a liquid crystal display device having a spread spectrum IC for a liquid crystal display device receiving a control signal of the TV spread spectrum IC for defining a diffusion ratio of the liquid crystal display device.

In order to achieve the above technical problem, the driving method of the display device according to the present invention comprises the steps of generating a control signal for controlling the spreading rate of the frequency in the spread spectrum IC for TV; And supplying the control signal to a spread spectrum IC for a liquid crystal display.

Other technical problems and features of the present invention in addition to the above technical problem will become apparent through the description of the embodiments with reference to the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a liquid crystal display and a TV SET according to the present invention.

The LCD TV shown in FIG. 1 includes a liquid crystal display device 160 and a TV SET 200.

The liquid crystal display device includes a liquid crystal display panel 150 having a pixel matrix, a gate driver 140 driving gate lines GL1 to GLn, a data driver 130 driving data lines DL1 to DLm, The timing controller 100 controls the gate driver 120 and the data driver 130.

The liquid crystal display panel 150 intersects each other with gate lines GL1 through GLn and data lines DL1 through DLm defining pixel regions, and the gate lines GL and data lines DL intersect each other. A thin film transistor TFT formed, a liquid crystal capacitor Clc formed in each pixel region connected to each thin film transistor TFT, and a storage capacitor Cst connected in parallel with the liquid crystal capacitor Clc are provided. The liquid crystal capacitor Clc is composed of a liquid crystal positioned between the pixel electrode connected to the thin film transistor TFT and the common electrode. The thin film transistor TFT is turned on by the gate-on voltages from the gate lines GL1 to GLn to supply the data voltages from the data lines DL1 to DLm to the pixel electrodes to supply the data voltage and the common voltage Vcom. The difference voltage between the two causes the liquid crystal capacitor Clc to be charged. The thin film transistor TFT is turned off by the gate-off voltage Voff from the gate lines GL1 to GLn to maintain the voltage charged in the liquid crystal capacitor Clc. At this time, the storage capacitor Cst keeps the voltage charged in the liquid crystal capacitor Clc stable.

The gate driver 140 shifts the gate start pulse GSP from the timing controller according to the gate shift clock GSC to sequentially turn on the gate line voltages Von to the gate lines GL1 to GLn. Supply a scan pulse with The gate driver 140 supplies the gate-off voltage Voff to the gate lines GL1 through GLn in the remaining periods in which the scan pulse of the gate-on voltage Von is not supplied. In addition, the gate driver 140 controls the pulse width of the scan pulse according to a gate output enable (GOE) signal from the timing controller 100.

The data driver 130 generates a sampling signal by shifting a source start pulse SSP from the timing controller 100 according to a source shift clock SSC. In addition, the data driver 130 latches the pixel data RGB input according to the source shift clock SSC according to the sampling signal, and then, in response to a source output enable (SOE) signal, the data driver 130 performs a horizontal line unit. Supply. Subsequently, the data driver 130 converts the pixel data RGB supplied in units of horizontal lines into an analog pixel signal by using a gamma voltage from a gamma generator (not shown) to convert the data to the data lines DL1 to DLm. Supply. Here, the data driver 130 determines the polarity of the pixel signal in response to the polarity control (POL) signal from the timing controller 100 when converting the pixel data RGB into the pixel signal. The data driver 130 determines a period in which the pixel signal is supplied to the data lines DL1 to DLm in response to the source output enable signal SOE.

The timing controller 100 includes a control signal generator 112 that generates control signals for controlling the gate driver 140 and the data driver 130, and a liquid crystal display that can reduce EMI of control signals and pixel data. A spread spectrum IC 110.

The control signal generator 112 controls the data driver 130 using the vertical and horizontal synchronization signals V and H, the data enable DE, and the dot clock DCLK input from the outside. While generating the DCS, the gate control signal GCS for controlling the gate driver 140 is generated. The data control signal DCS includes a source shift clock SSC, a source start pulse SSP and a polarity control signal POL, a source output enable signal SOE, and the like. The gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, and the like.

The spread spectrum IC 110 for the liquid crystal display reduces electromagnetic interference between various control signals and pixel data signals transmitted to the gate driver 140 and the data driver 130. . In other words, the dot clock DCLK supplied to the spread spectrum integrated circuit 110 is spread at a predetermined spread rate and input to the control signal generator 112. Accordingly, the source shift clock (SSC), the source start pulse (SSP), the polarity control signal (POL), and the source output enable signal (SOE) using a dot clock (hereinafter referred to as SDCLK) spread according to a spread spectrum method. ), Control signals such as a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, and the like. Meanwhile, the spread spectrum IC 110 for the liquid crystal display may be embedded in the timing controller 100 and may be installed separately from the timing controller 100.

In the spread spectrum IC 220 for the TV, the spread spectrum IC 220 is mounted on the TV set board 220 to reduce EMI, such as the liquid crystal display 160. Here, the spread spectrum IC 110 for a liquid crystal display of the present invention receives a control signal from the spread spectrum IC 220 for a TV and sets the spread ratio of the spread spectrum IC 220 for a TV. In this case, the spread spectrum IC 220 for the TV and the spread spectrum IC 110 for the liquid crystal display are connected to each other through the connectors 102 and 202, respectively.

FIG. 2 is a plan view illustrating the spread spectrum IC for TVs and the spread spectrum IC for liquid crystal displays.

The spread spectrum IC 220 for a TV reduces electromagnetic interference (EMI) of various control signals transmitted to the driving circuit unit inside the TV 200. The spread spectrum IC 220 for the TV spreads the frequency supplied from the outside by a predetermined spreading rate and supplies the spread spectrum IC to the driving circuit unit inside the TV 200. In other words, the frequency supplied to the spread spectrum IC 220 for the TV is spread out by a predetermined percentage according to the first and second control signals CS1 and CS2 and output.

In detail, the spread spectrum IC 220 for a TV includes a spread rate controller 222 for setting a spread rate according to the first and second control signals CS1 and CS2, and a spread rate controller 222 for a frequency input from the outside. And a first modulator 224 that modulates and outputs the modulated signal according to the set diffusion ratio. In this case, the first control signal CS1 is supplied through the S1 pin among the plurality of pins of the spread spectrum IC 220 for the TV, and the second control signal CS2 is supplied through the plurality of pins of the spread spectrum IC 220 for the TV. Is supplied through the S0 pin.

The diffusion rate controller 222 includes a first voltage divider 232 output according to the first control signal CS1 and a second voltage divider 234 output according to the second control signal CS2. The first voltage divider 232 includes a first resistor R1 connected to the power supply voltage Vcc and a second resistor R2 connected to the base voltage GND. The second voltage divider 234 includes a third resistor R3 connected to the power supply voltage Vcc and a fourth resistor R4 connected to the base voltage GND. Accordingly, the first voltage divider 232 is combined with the voltages distributed by the first and second resistors R1 and R2 and the first control signal CS1 to be supplied to the modulator 224, and the second voltage divider ( 234 is supplied to the first modulator 224 by combining the voltage divided by the third and fourth resistors R3 and R4 and the second control signal CS2. Here, the first and second control signals CS1 and CS2 have a logic state of 1, M, 0. The logic state of 1 means power supply voltage (Vcc), the logic state of 0 means ground voltage (GND), and the logic state of M means that neither power supply voltage (Vcc) nor ground voltage (GND) is supplied. it means. That is, the spreading rate controller 222 determines the spreading range of the frequency according to the first and second control signals CS1 and CS2. Table 1 shows a spread ratio of frequencies corresponding to the first control signal CS1 input to the S0 pin and the second control signal CS2 input to the S1 pin. For example, a method of adjusting the spreading rate according to the first and second control signals CS1 and CS2 when the frequency input to the spread spectrum IC is 70 MHz will be described.

Input Frequency (MHz) S1 = 1 S0 = M (%) S1 = 0 S0 = 1 (%) S1 = 1 S0 = 1 (%) S1 = M S0 = 1 (%) 50-60 29 21 1.5 1.2 60-70 28 20 1.4 1.1 70-80 26 1.8 1.3 1.1 80-100 24 1.7 1.2 1.0

When the frequency input to the TV spread spectrum IC 220 is 70 MHz, in order to have a 1.3% spread frequency, the first and second control signals CS1 and CS2 are supplied with a logic state of 1 as shown in Table 1 above. Do it. Accordingly, the first voltage divider 232 is supplied to the first modulator 224 of the first voltage CV1 in which the power voltage Vcc and the voltages divided from the first and second resistors R1 and R2 are combined. . The second voltage divider 234 is also supplied to the first modulator 224 of the second voltage CV2 in which the power voltage Vcc and the voltages divided from the third and fourth resistors R3 and R4 are combined. As a result, the modulator 224 spreads the 70 MHz supplied to the first modulator 224 by 1.3% by the first and second control signals CS1 and CS2. At the same time, the signals output from the first and second voltage dividers 232 and 234 are supplied to the second modulator 114 of the spread spectrum IC 110 for the liquid crystal display.

When the frequency input to the TV spread spectrum IC 220 is 70 MHz, in order to have a frequency spread by 26%, the first control signal CS1 has a logic state of 1 and a second control signal ( CS2) supplies the logic state of M. Accordingly, the first voltage divider 232 supplies the first modulating unit 224 with the first voltage CV1, which is the sum of the power voltage Vcc and the voltages divided from the first and second resistors R1 and R2. do. Since the second voltage divider 234 is not supplied with any signal, the second voltage divider 234 is supplied to the first modulator 224 of the divided second voltage CV2 from the third and fourth resistors R3 and R4. As a result, the frequency of 70 MHz is spread out by 26% by the first and second control signals CS1 and CS2 supplied to the first modulator 224. At the same time, the signals output from the first and second voltage dividers 232 and 234 are supplied to the second modulator 114 of the spread spectrum IC 110 for the liquid crystal display.

When the frequency input to the TV spread spectrum IC 220 is 70 MHz, the first control signal CS1 has a logic state of 0 and a second control signal (see FIG. 1) in order to have a 1.8% spread frequency. CS2) supplies a logic state of one. Accordingly, the first voltage divider 232 supplies the first modulating unit 224 with the first voltage CV1, which is the sum of the base voltage GND and the voltages divided from the first and second resistors R1 and R2. do. The second voltage divider 234 is supplied to the first modulator 224 with the second voltage CV2 obtained by adding the power supply voltage Vcc and the divided voltages from the third and fourth resistors R3 and R4. . As a result, a frequency of 70 MHz is spread by 1.8% by the first and second control signals CS1 and CS2 supplied to the first modulator 224. At the same time, the signals output from the first and second voltage dividers 232 and 234 are supplied to the second modulator 114 of the spread spectrum IC 110 for the liquid crystal display.

When the frequency input to the TV spread spectrum IC 220 is 70 MHz, the first control signal CS1 has a logic state of M and the second control signal CS2 as shown in Table 1 to have a frequency that is 1.1% spread. Supplies a logic state of one. Accordingly, since the logic voltage is not supplied to the first voltage divider 232, the first voltage CV1 distributed from the first and second resistors R1 and R2 is supplied to the first modulator 224. The second voltage divider 234 is supplied to the first modulator 224 with the second voltage CV2 obtained by adding the power supply voltage Vcc and the divided voltages from the third and fourth resistors R3 and R4. . As a result, the frequency of 70 MHz is spread out by 1.1% by the first and second control signals CS1 and CS2 supplied to the first modulator 224. At the same time, the signals output from the first and second voltage dividers 232 and 234 are supplied to the second modulator 114 of the spread spectrum IC 110 for the liquid crystal display. That is, the diffusion rate of the spread spectrum IC 220 for TV and the spread spectrum IC 110 for the liquid crystal display device are the same. Accordingly, the diffusion spectrum of the TV spread spectrum IC 220 and the liquid crystal display device of the diffusion spectrum IC 220 and the liquid crystal display device of the spread spectrum IC 110 do not apply to each other, but the diffusion spectrum IC 220 and the liquid crystal display device diffusion By applying the same diffusion rate to the spectrum IC 110, no screen defects occur. In addition, the signals output from the first and second voltage dividers 232 and 234 are directly supplied to the second modulator 114 of the spread spectrum IC 110 for the liquid crystal display, thereby providing the spread spectrum IC 110 for the liquid crystal display. No diffusion control is needed.

Accordingly, the frequency supplied from the outside is not kept constant, but has a form of shaking at a constant diffusion rate, and as a result, an electromagnetic interference (EMI) is canceled out between the shaking control signals, thereby obtaining a reduction effect.

On the other hand, the upper limit of the diffusion rate is defined in the spread spectrum IC 110 for the liquid crystal display before setting the diffusion rate in the diffusion rate controller 222 of the TV spread spectrum IC 220. In other words, when the diffusion spread ICs 110 and 220 of each of the liquid crystal display 160 and the TV SET 200 are doubled, the upper limit of the diffusion rate may be set so as to prevent screen abnormality caused by the diffusion spread ICs 110 and 220. Consider it and do not go any further. For example, in the case of the liquid crystal display 160 and the TV 200 having a frequency of 70 MHz, the diffusion spread IC 220 for the TV does not occur when the screen ratio does not occur when the diffusion rate does not exceed 1.8% in the liquid crystal display 160. Do not set the diffusion rate over 1.8% at

As described above, the display device and the driving method thereof according to the present invention form only one spread spectrum IC for the TV among the liquid crystal display and the spread spectrum IC of the TV. That is, the spread spectrum IC for the liquid crystal display device is controlled by receiving the same control signal generated by the spread rate controller of the spread spectrum IC for the TV. Accordingly, it is possible to prevent a screen defect caused by differently applying the diffusion rate of the TV and the diffusion rate of the liquid crystal display.

In addition, by adjusting the spread spectrum IC for the liquid crystal display in the spread spectrum IC for the TV, the spread spectrum controller is not required for the spread spectrum IC for the liquid crystal display, thereby reducing the cost.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It is apparent that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Claims (5)

A TV SET having a spread spectrum IC for a TV for generating a control signal for controlling the spread rate of the frequency; And And a liquid crystal display device having a spread spectrum IC for a liquid crystal display device receiving a control signal of the TV spread spectrum IC for defining a diffusion ratio of the liquid crystal display device. The method of claim 1, The spread spectrum IC for a TV includes: a spread rate controller configured to set a spread rate according to the control signal; And And a first modulator for modulating and outputting a frequency input from the outside according to the diffusion rate set by the diffusion rate controller. The method of claim 2, The spread spectrum IC for the liquid crystal display device includes a second modulator for outputting a modulated frequency from outside according to the spread rate set by the spread rate controller. The method of claim 3, The diffusion rate control unit A first voltage divider comprising a first resistor connected to the power supply voltage and a second resistor connected to the base voltage; And a second voltage divider comprising a third resistor connected to a power supply voltage and a fourth resistor connected to a base voltage. Generating a control signal for controlling the spreading ratio of frequencies in a spread spectrum IC for the TV; And And supplying the control signal to a spread spectrum IC for a liquid crystal display.
KR1020070065518A 2007-06-29 2007-06-29 Display device and method of driving the same KR20090001272A (en)

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KR1020070065518A KR20090001272A (en) 2007-06-29 2007-06-29 Display device and method of driving the same

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KR1020070065518A KR20090001272A (en) 2007-06-29 2007-06-29 Display device and method of driving the same

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KR20090001272A true KR20090001272A (en) 2009-01-08

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