KR20080088078A - Liquid crystal display and driving method thereof - Google Patents

Liquid crystal display and driving method thereof Download PDF

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Publication number
KR20080088078A
KR20080088078A KR1020070030463A KR20070030463A KR20080088078A KR 20080088078 A KR20080088078 A KR 20080088078A KR 1020070030463 A KR1020070030463 A KR 1020070030463A KR 20070030463 A KR20070030463 A KR 20070030463A KR 20080088078 A KR20080088078 A KR 20080088078A
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KR
South Korea
Prior art keywords
signal
data
block
frame
backlight unit
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Application number
KR1020070030463A
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Korean (ko)
Inventor
조덕구
Original Assignee
삼성에스디아이 주식회사
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Priority to KR1020070030463A priority Critical patent/KR20080088078A/en
Publication of KR20080088078A publication Critical patent/KR20080088078A/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
    • G09G3/22—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 using controlled light sources
    • 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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. 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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source

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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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

An LCD(Liquid Crystal Display) and a driving method thereof are provided to control luminance of a backlight light source by using a carbon nano tub as a backlight unit of the LCD and control luminance in a block unit of the LCD. A pixel unit(100) displays an image according to a data signal and a scan signal, and displays images by receiving a light source in a block unit by being divided into plural blocks. A data driver(200) receives an image signal to generate the data signal, and transmits the generated signal to the pixel unit. A scan driver(300) generates the scan signal and transmits the generated scan signal to the pixel unit. A backlight unit(400) includes plural light sources corresponding to the plural blocks, and transmits light to the pixel unit. The backlight unit generates block data inputted into a light source in the block unit, and controls brightness by controlling a pulse width of the block data in correspondence with an image signal inputted into one frame.

Description

Liquid crystal display and its driving method {LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF}

1 is a structural diagram showing a structure of a general liquid crystal display.

2 is a structural diagram showing a structure of a liquid crystal display according to the present invention.

3 is a block diagram illustrating a method of controlling a backlight unit by using an image signal in the backlight unit in the liquid crystal display according to the present invention.

4 is a structural diagram illustrating a structure of a backlight unit illustrated in FIG. 2.

FIG. 5 is a structural diagram illustrating a structure of a cathode driver employed in the electron emission display device illustrated in FIG. 4.

6A and 6B are timing diagrams illustrating a clock signal transmitted to a cathode driver.

*** Explanation of symbols on main parts of drawings ***

100: pixel portion 200: data driver

300: scan driver 400: backlight

The present invention relates to a liquid crystal display device and a driving method thereof, and in more detail, using a carbon nanotube as a backlight unit of the liquid crystal display device to adjust the brightness of the backline light source and to adjust the brightness in units of blocks of the liquid crystal display device. The present invention relates to a liquid crystal display device having a backlight, and a driving method thereof.

In a flat panel display, a plurality of pixels are arranged on a substrate to form a display area, and a scan line and a data line are connected to each pixel to selectively apply a data signal to the pixel for display.

The flat panel display is classified into a passive matrix type light emitting display device and an active matrix type light emitting display device according to the driving method of a pixel, and is selected and lit for each unit pixel in view of resolution, contrast, and operation speed. Matrix type is the mainstream.

Such a flat panel display is used as a display device such as a personal information terminal such as a personal computer, a mobile phone, a PDA, or a monitor of various information devices. An organic light emitting display device using a liquid crystal panel, an organic light emitting diode, or a plasma is used. PDPs using panels are known.

1 is a structural diagram showing a structure of a general liquid crystal display. Referring to FIG. 1, the liquid crystal display includes a pixel unit 10, a data driver 20, a scan driver 30, and a backlight unit.

The pixel portion 10 has a plurality of data lines D1, D2 ... Dm and a plurality of scan lines S1, S2, ... Sn intersecting each other, and the data lines D1, D2 ... Dm and the scan line ( A plurality of pixels 11 are formed in a region where S1, S2, ... Sn intersect. One pixel 11 corresponds to one liquid crystal cell, and the liquid crystal cell receives the data signal and the scan signal by the data lines D1, D2 ... Dm and the scan line to adjust the liquid crystal array of the liquid crystal cell. The image can be expressed by transmitting or blocking light.

The data driver 20 is connected to the data lines D1, D2 ... Dm to transfer the data signals to the data lines D1, D2 ... Dm so that the pixel unit 10 can receive the data signals. do.

The scan driver 30 is connected to the scan lines S1, S2, ... Sn to transfer the scan signal to the scan lines S1, S2, ... Sn, and the data signal is applied to the pixel 11 selected by the scan signal. To be delivered.

The backlight unit 40 generates light and transmits the light to the pixel unit 10 to transmit or block light generated by the backlight unit 40 in each liquid crystal cell of the pixel unit 10 so as to display an image.

The liquid crystal display configured as described above emits light with the same brightness regardless of whether the gray level of the image displayed by the backlight unit is high or low. Therefore, even when a dark screen is displayed, there is a problem in that it consumes the same power as a bright screen. In addition, when displaying a bright screen, there is a fear that the glare is large, there is a problem that the visibility is poor.

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to adjust the brightness of the backlight unit in response to the data signal by using the back light emitting device to reduce power consumption and improve visibility It is to provide a liquid crystal display device and a driving method thereof.

In order to achieve the above object, the first aspect of the present invention provides an image signal corresponding to a data signal and a scan signal, and is divided into a plurality of blocks. A data driver to generate the data signal and transmit the data signal to the pixel unit, a scan driver to generate the scan signal and transmit the light signal to the pixel unit, and a plurality of light sources corresponding to the plurality of blocks. And a backlight unit configured to transmit the backlight unit, wherein the backlight unit generates block data input to the light source in units of blocks, and adjusts brightness by adjusting a pulse width of the block data in response to an image signal input in one frame. To provide.

In order to achieve the above object, a second aspect of the present invention provides a method of providing a display device comprising: dividing a pixel unit into a plurality of blocks and adding a sum of grays of data signals input in units of blocks and grays of data signals input in one frame; Luminance is a method of driving a liquid crystal display device comprising the step of determining corresponding to the gray level of the data signal input in units of blocks and the data combination of the data signal input in one frame.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a structural diagram showing a structure of a liquid crystal display according to the present invention. Referring to FIG. 2, the liquid crystal display includes a pixel unit 100, a data driver 200, a scan driver 300, and a backline unit 400.

The pixel portion 100 has a plurality of data lines D1, D2 ... Dm and a plurality of scan lines S1, S2, ... Sn intersecting and a plurality of data lines D1, D2 ... Dm. A plurality of pixels 101 are formed in an area where the plurality of scan lines S1, S2, ... Sn intersect. One pixel corresponds to one liquid crystal cell, and the liquid crystal cell receives the data signal and the scan signal by the data lines D1, D2 ... Dm and the scan lines S1, S2, ... Sn. Adjust the arrangement of the liquid crystal to transmit or block the light so that the image can be expressed. In addition, the pixel unit 100 is divided into a plurality of blocks so that a separate light source can be received in units of blocks to represent an image, and thus a block representing a bright image receives light from a bright light source and a block representing a dark image. It receives light from a dark light source so that the dark and bright parts of a screen can be adjusted to separate brightness.

The data driver 200 is connected to the plurality of data lines D1, D2 ... Dm to transfer data signals to the plurality of data lines D1, D2 ... Dm, thereby transferring the data signals to the pixels 101. To be possible.

The scan driver 200 is connected to the plurality of scan lines S1, S2,... Sn to transfer scan signals to the plurality of scan lines S1, S2, ... Sn, and is selected by the scan signal. Data signal can be transmitted.

The backlight unit 400 generates light and transmits the light to the pixel unit to transmit or block the light generated by the backlight unit 400 in each liquid crystal cell of the pixel unit 100 to express an image. In this case, the backlight unit 400 includes an electron emission display device including a plurality of electron emission units, and the plurality of electron emission units may be a plurality of light sources so that each light source corresponds to one block to receive light in block units. Make sure The electron emission unit includes carbon nanotubes (CNT).

In addition, the backlight unit 400 may adjust the overall luminance in response to the luminance emitted by the pixel unit 100 during one frame period. That is, when there are many pixels expressing high luminance in each pixel of the pixel unit during one frame period, the backlight unit 400 emits light with a lower brightness than a predetermined luminance, and expresses low luminance in each pixel of the pixel unit 100. When there are many pixels, the backlight unit 400 emits light with a luminance higher than a predetermined luminance. Therefore, when the pixel unit 100 emits light with high luminance, the luminance of the backlight unit 400 is lowered to a certain level to prevent glare, and when the pixel unit 100 emits low luminance, the luminance is reduced. Increase the contrast ratio to some degree to increase the visibility. In the case of emitting light with high brightness, power consumption can be reduced by lowering the luminance to some extent.

3 is a block diagram illustrating a method of controlling a backlight unit by using an image signal in the backlight unit in the liquid crystal display according to the present invention. Referring to FIG. 3, the backlight unit 400 receives an image signal and generates block data and frame data to adjust brightness of the backlight unit.

The backlight unit 400 receives an image signal, extracts block data in units of blocks (500), and extracts frame data using an image signal input in one frame (510). Block data refers to data input to one block and is formed by using an image signal input to one block. If one block corresponds to one pixel, the image signal becomes block data, and if a plurality of pixels corresponds to one block, the image signal is formed using the sum of the image signals input to the pixels corresponding to one block. Therefore, the brightness of the light source is adjusted for each block, so that the bright part receives light from the light source emitting high brightness and the dark part receives light from the light source emitting low brightness, thereby improving luminous efficiency.

In addition, frame data represents the sum of video signals input in one frame section. If the size of the frame data is large, the luminance of one frame is high, and if the size of the frame data is small, the luminance of one frame is low, so that one frame according to the size of the frame data is obtained. If the brightness of one frame is high, the brightness of the frame is high to prevent glare by reducing the brightness of the frame, and the power consumption is reduced. If the brightness of one frame is low, the brightness of the frame is maintained to prevent the brightness from being lowered. Let this be better.

Then, the clock generator is controlled by the frame data to generate a clock signal by the clock generator. When the size of the frame data is smaller than that of the frame data, the clock signal is shortened in frequency (520).

After counting the clock signal, the block data is compared to generate a cathode signal. The cathode signal allows the time point delivered by the clock signal and the block data to be adjusted.

4 is a structural diagram illustrating a structure of a backlight unit illustrated in FIG. 2. Referring to FIG. 4, the backlight unit 400 includes an electron emission display device, and the electron emission display device includes a light source unit 410, a cathode driver 420, a clock generator 430, and a gate driver 440. Include.

In the light source unit 410, a plurality of light sources 401 are formed at portions where the cathode electrodes C1, C2... Cn and the gate electrodes G1, G2 .. Gn intersect, and the cathode electrodes C1,. The electrons emitted by .Cn) collide with the anode and the phosphor emits light, thereby emitting light. The amount of light emitted is determined in accordance with the amount of electrons emitted from the cathode electrodes C1, C2 ... Cn and corresponds to the gray value of the image signal. In order to control the amount of electrons emitted through the image signal, a pulse width modulation method or a pulse amplitude modulation method may be generally used.

The cathode driver 420 receives the image signal and the clock to generate block frame data, and generates a cathode signal based on the block data and the frame data. The cathode signal is connected to the cathode electrodes C1, C2... Cn and transmits a cathode signal to each light source of the light source unit 410. Block data is data corresponding to video signals transmitted to each block of the pixel portion, and frame data is data representing the sum of video signals input in one frame section.

The clock generator 430 outputs a clock and transmits the clock to the cathode, and receives a video signal to adjust a pulse width of the clock. The clock has a large pulse width when there are many pixels with high luminance, and the pulse width is small when there are many pixels with low luminance. The gate driver 440 is connected to the gate electrodes G1, G2 ... Gn, generates a gate signal, and transmits the gate signal to the light source unit 410 so that the light source unit 410 is sequentially lined by a horizontal line unit by a line scan method. By emitting light, it can be driven while reducing the circuit cost and power consumption by displaying the entire screen.

FIG. 5 is a structural diagram illustrating a structure of a cathode driver employed in the electron emission display device illustrated in FIG. 4. 6A and 6B illustrate clock signals transmitted to the cathode driver. Referring to FIGS. 5, 6A, and 6B, the cathode driver 420 includes a shift register 421, a latch 422, a counter 423, a comparator 424, a level shifter 425, and a buffer 426. ).

The shift register 421 receives the block data in series and transfers the data to the latch 422. The latch 422 outputs the block data input in series to the comparator 424 in parallel. The counter 423 counts the clock signal when the input gradation of the block data represents 8 bits, and counts the number from 255 to 0 using the clock. The clock signal CLK adjusts the width of the pulse by using the frame data. When the size of the frame data is small, the clock signal having the small pulse width is input to the counter as shown in FIG. 6A and the size of the frame data is large. The clock signal CLK having a large pulse width is input to the counter 423 as shown in 6b.

The comparator 424 compares the number input from the latch 422 with the number counted by the counter 423, and outputs a signal when the value of the video signal coincides with the value of the counter 423. In this case, when the frame data is large, a clock signal having a large pulse width is input and the counting time is long even if the same number is input. Will be shortened. The signal output from the comparator 424 is transferred to the buffer 426 through the level shifter 425 to output analog block data. When the block data is large, the analog block data is outputted from the comparator 424 late, so that the pulse width is shortened. If the frame data is small, the analog block data is outputted from the comparator 424 fast, so that the pulse width is long. Therefore, the timing applied to the cathode electrode is adjusted so that the pulse width is determined in response to the block data and the clock signal so that the brightness can be adjusted for each block and the overall brightness can be adjusted to correspond to the brightness of one frame. .

According to the liquid crystal display device and the driving method thereof according to the present invention, the brightness of the backlight unit of the liquid crystal display device can be adjusted in accordance with the data signal, and a separate light source is transmitted in block units of the liquid crystal display device to block the liquid crystal display device. You can adjust the brightness. In addition, by identifying the luminance on a frame-by-frame basis, when one frame emits light with high luminance, the luminance is decreased, and when the frame emits low luminance, the luminance is increased to increase visibility. In addition, power consumption may be reduced and life of the backlight unit may be improved.

While preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. You must lose.

Claims (11)

A pixel unit which represents an image corresponding to a data signal and a scan signal, and is divided into a plurality of blocks and receives a light source in units of blocks to represent an image; A data driver which receives an image signal and generates the data signal and transmits the data signal to the pixel unit; A scan driver which generates the scan signal and transmits the scan signal to the pixel unit; And A backlight unit including a plurality of light sources corresponding to the plurality of blocks and transmitting light to the pixel unit; And the backlight unit generates block data input to the light source in units of blocks, and adjusts brightness by adjusting a pulse width of the block data in response to an image signal input in one frame. The method of claim 1, The backlight unit, A light source unit including a plurality of light sources, the light source including an anode electrode formed at a high voltage so that electrons are emitted in response to voltages applied to the first electrode and the second electrode, and the emitted electrons collide with each other; A cathode driver configured to receive the block data and the clock signal, generate a cathode signal, and transmit the cathode signal to the first electrode; A gate driver configured to generate a gate signal and transmit the gate signal to the second electrode; And And a clock generator which receives the image signal and generates the clock signal and transmits the clock signal to the cathode driver. The method of claim 1 And the backlight unit generates a clock signal and determines a pulse width of the clock signal in response to an image signal input to the one frame. The method of claim 1, If the clock signal has a large magnitude of the video signal input to the one frame, the pulse width of the clock signal is small, and if the magnitude of the video signal input to the one frame is small, the pulse width of the clock signal is increased. LCD display device. The method of claim 2, The cathode driving unit Shift register; A latch which receives the block data in series and outputs the video signals in parallel by the shift register; A counter that receives the clock signal and sequentially counts the clock signal; A comparator for comparing a value counted by the counter with block data output from the latch and outputting a signal at a predetermined time point; And And a level shifter configured to apply the cathode signal having a predetermined voltage when a signal is output from the comparator. The method of claim 1, And a pulse width of the block data is determined corresponding to the sum of the video signals input to the one frame. Dividing the pixel portion into a plurality of blocks and adding up the sum of the gray levels of the data signals input in block units and the gray levels of the data signals input in one frame; And And the brightness of the backlight unit is determined in correspondence with the gray level of the data signal input in block units and the gray level combination of the data signal input in one frame. The method of claim 7, wherein And a backlight unit of which the brightness is controlled for each block. The method of claim 7, wherein If the sum of the gray level of the data signal input to the one frame is large, the brightness of the backlight unit is lowered; if the gray level combination of the data signal input to the one frame is small, the brightness of the backlight unit is a driving method . The method of claim 7, wherein In determining the brightness of the backlight unit, And counting the clock signal and determining a time point at which a light source emits light in comparison with a block signal transmitted for each block. The method of claim 10, And a frequency is adjusted in response to the sum of the image signals input to the one frame to adjust the count time of the clock signal in response to the change of the frequency.
KR1020070030463A 2007-03-28 2007-03-28 Liquid crystal display and driving method thereof KR20080088078A (en)

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