KR20110064742A - Back light unit and method driving of the same - Google Patents

Back light unit and method driving of the same Download PDF

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Publication number
KR20110064742A
KR20110064742A KR1020090121458A KR20090121458A KR20110064742A KR 20110064742 A KR20110064742 A KR 20110064742A KR 1020090121458 A KR1020090121458 A KR 1020090121458A KR 20090121458 A KR20090121458 A KR 20090121458A KR 20110064742 A KR20110064742 A KR 20110064742A
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KR
South Korea
Prior art keywords
light source
light
image data
green
red
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KR1020090121458A
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Korean (ko)
Inventor
안상현
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엘지디스플레이 주식회사
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Priority to KR1020090121458A priority Critical patent/KR20110064742A/en
Publication of KR20110064742A publication Critical patent/KR20110064742A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention discloses a backlight unit capable of improving image quality.

The disclosed backlight unit includes a red, green, and blue light emitting diode emitting red, green, and blue light, and includes a first light source driven by a scanning method, and a white light emitting diode emitting white light. And a second light source driven by a dimming method, an image data analyzer for analyzing the image data, and a light source driver for selectively driving the first and second light sources according to the image data analyzed from the image data.

Description

BACK LIGHT UNIT AND METHOD DRIVING OF THE SAME}

The present invention relates to a backlight unit, and more particularly, to a backlight unit capable of improving image quality and a driving method thereof.

Cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices, but the size and weight of electronic products are reduced due to the weight and size of CRT itself. Could not actively respond to the response.

As a solution to this problem, the liquid crystal display device has a tendency that its application range is gradually widening due to the features such as light weight, thinning, low power consumption driving. Accordingly, in order to meet the needs of users, liquid crystal display devices are progressing in the direction of large area, thinning, and low power consumption.

BACKGROUND ART A liquid crystal display device is a display device that displays an image by controlling the amount of light passing through a liquid crystal, and is widely used for advantages such as thinning and low power consumption.

Unlike the CRT, the liquid crystal display is not a display device that emits light by itself, and thus, a backlight unit including a separate light source is provided on the back of the liquid crystal display panel to provide light for visually representing an image.

The light source of the backlight unit includes an external eletrode fluorescent lamp (EEFL) covering the outer region of both ends, a cold cathode fluorescent lamp (CCFL) in which electrodes are inserted at both ends of the lamp, and a light emitting diode (LED). : light emitting diode) is used.

In recent years, the backlight unit mainly uses light emitting diodes that are advantageous for low power consumption and slimming.

The backlight unit is divided into an edge method and a direct method according to the position of the light source.

In the edge method, a light source is disposed on the side surface, and the light guide plate is used to convert point light into surface light and provide the light to the liquid crystal display panel. do.

A general backlight unit includes a white light emitting diode that emits white light as an edge light source and a direct light source.

However, a general edge type backlight unit is difficult to implement high brightness by providing light to a liquid crystal display panel through a light guide plate, and a direct light type backlight unit has a problem in that color reproducibility is deteriorated due to characteristics of a white light emitting diode.

It is an object of the present invention to provide a backlight unit and a driving method thereof capable of improving image quality.

The backlight unit according to an embodiment of the present invention,

A first light source comprising red, green and blue light emitting diodes emitting red, green and blue light and driven in a scanning manner; A second light source comprising a white light emitting diode emitting white light and driven by a local dimming method; An image data analyzer analyzing the image data; And a light source driver for selectively driving the first and second light sources according to the image data analyzed from the image data.

In addition, the backlight unit driving method of the present invention,

Driving a first light source emitting red, green and blue light in a scanning manner; Driving a second light source emitting white light in a local dimming manner; Analyzing image data; Generating a control signal for driving the first and second light sources according to the analyzed image data; And selectively driving the first and second light sources by the control signal.

The present invention has a structure comprising a first light source unit disposed on the side to emit red, green and blue light, and a third light source unit disposed below to emit white light, and analyzes the image data. Accordingly, by selecting the edge scanning driving method in which the first and second light source units are driven or the direct local dimming driving in which the third light source unit is driven, color reproduction can be improved and high brightness can be realized.

In addition, the present invention includes a white light emitting diode, red, green and blue light emitting diodes arranged at regular intervals from each other, and analyzes the image data to drive local dimming using a white light emitting diode and using red, green and blue light emitting diodes By selecting the scanning drive, not only can the color reproduction rate be improved, but also high brightness can be realized.

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

1 is an exploded perspective view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating the liquid crystal display device taken along the line II ′ of FIG. 1.

As shown in FIG. 1 and FIG. 2, the liquid crystal display according to the exemplary embodiment of the present invention is provided with a liquid crystal display panel 110 on which an image is displayed and is disposed under the liquid crystal display panel 110 to provide light. And a panel guide 118 supporting an edge of a lower surface of the liquid crystal display panel 110 and coupled to the backlight unit 120.

Although not shown in detail, the liquid crystal display panel 110 may be a thin film transistor (TFT) substrate 113 and a color filter substrate 111 bonded together to maintain a uniform cell gap facing each other, and the thin film transistor. And a liquid crystal layer (not shown) interposed between the color filter substrates 113 and 111. In the thin film transistor substrate 113, a plurality of gate lines are formed, a plurality of data lines intersecting the plurality of gate lines are formed, and a thin film transistor TFT is formed at an intersection area of the gate line and the data line. . The color filter is formed on the color filter substrate 111 so as to correspond to each pixel.

A gate driving printed circuit board (103) for supplying a scan signal to a gate line is provided at an edge of the liquid crystal display panel 110, and a data driving printed circuit board (101) for supplying a data signal to a data line. ) Is provided.

The gate and data driving PCBs 103 and 101 are electrically connected to the liquid crystal display panel 110 by a chip on film 105. Here, the COF 105 may be changed to a tape carrier package (TCP).

The backlight unit 120 includes a bottom cover 190 having an upper surface open, first and second light source units 150a and 150b provided on an inner side surface of the bottom cover 190, and the first and second light sources. A light guide plate 140 disposed in parallel with the light source units 150a and 150b to convert the point light incident from the first and second light source units 150a and 150b into surface light, and disposed on the light guide plate 140. Optical sheets 130 for diffusing and condensing light irradiated from 140.

The backlight unit 120 includes a diffusion plate 160 disposed below the light guide plate 140 and a plurality of third light source units 180 disposed below the diffusion plate 160.

Although not shown in the drawings, the backlight unit 120 is provided between the first and second light source units 150a and 150b and the bottom cover 180 to be generated from the first and second light source units 150a and 150b. A heat dissipation plate (not shown) may be further included to quickly transfer the heat to the bottom cover 190.

The first and second light source units 150a and 150b are disposed at both side surfaces of the bottom cover 190 facing each other.

The first and second light source units 150a and 150b include a first printed circuit board 151 and a plurality of red, green, and blue light emitting diodes 153 mounted on the first printed circuit board 151. do.

The plurality of red, green and blue light emitting diodes 153 may be in a red-green-blue arrangement or in a red-green-green-blue arrangement.

The light guide plate 140 is divided into a plurality of parts, and a dot pattern is formed to have a large dot pattern from a region far from the first and second light source units 150a and 150b to a large area, and a large size of the guide pattern is formed.

Here, the doped pattern is formed on the lower surface of the light guide plate 140.

The plurality of third light source units 180 are disposed at regular intervals below the diffusion plate 160, and are mounted on the second printed circuit board 181 and the second printed circuit board 181. A white light emitting diode 183 is included.

The white light emitting diode 183 has a structure in which a lens for diffusing light is integrally formed on the light emitting surface on which light is emitted or the lens is not formed.

The driving of the liquid crystal display device having the above structure will be described in detail with reference to FIGS. 3 and 4.

3 is a diagram schematically illustrating a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating a configuration of a driving unit for driving a backlight unit.

3 and 4, the liquid crystal display according to the exemplary embodiment of the present invention crosses the gate lines GL1 to GLn and the data lines DL1 to DLm and forms liquid crystals formed at the intersections thereof. A liquid crystal display panel 210 having a thin film transistor (TFT) for driving the cell Clc and a data signal for supplying data signals to the data lines DL1 to DLm of the liquid crystal display panel 210. Controls the data driver 240, the gate driver 230 for supplying scan signals to the gate lines GL1 to GLn of the liquid crystal display panel 210, the gate driver 230, and the data driver 240. And a timing controller 250.

When the scan pulse is sequentially supplied to the gate lines GL1 to GLn, the thin film transistor TFT is turned on to form a channel between the source electrode and the drain electrode to convert the voltage on the data lines DL1 to DLm into the liquid crystal cell. It is supplied to the pixel electrode of (Clc). In this case, the liquid crystal molecules of the liquid crystal cell Clc modulate incident light by changing an arrangement by an electric field between the pixel electrode and the common electrode.

The timing controller 250 controls the vertical / horizontal sync signal Vsync / Hsync, the data enable signal DE, the clock signal Clk, and the data signals R, G, and B data supplied from a system (not shown). The data driver 240, the gate driver 230, and the backlight unit 220 are controlled using the data driver 240.

The backlight unit 220 uses the first to third light source units 150a, 150b, and 180 of FIG. 1 using the backlight control signal BCS and the data signals R, G, and B data from the timing controller 250. Drive.

The backlight unit 220 includes an image data analyzer 221 analyzing the image data R, G, and B data input from the timing controller 250, and the image analyzed by the image data analyzer 221. Edge-type scanning driving by the LED driver 223 for driving the first to third light source units 150a, 150b, and 180 of FIG. 1 and the LED driver 223 according to data R, G, and B data. 227 or selector 225 to select direct local dimming drive 228.

Here, the selector 225 may select any one of the edge type scanning drive 227 and the direct type local dimming drive 228 by the control signal CS of the LED driver 223, and adjusts the duty value. One can be selected as the main and the other can be selected as the sub.

The first and second light source units 150a, 150b and 180 of FIG. 1 are driven at the edge type scanning drive 227 by the control signal CS of the LED driver 223, and the third light source unit (180 in FIG. 1) is driven at the time of the direct local dimming drive 228 by the control signal CS of the LED driver 223. FIG.

The image data analyzer 221 analyzes whether the input image data R, G, and B data is a gray-based image including white and black or a colorful image in which a plurality of colors are mixed.

The LED driver 223 controls the selector 225 when the image data (R, G, B Data) analyzed by the image data analyzer 221 is a gray-based image including white and black. Select local dimming drive 228. Here, the LED driver 223 may adjust the dimming value to select the direct local dimming drive 228 as the main and the edge type scanning drive 227 as the sub.

According to the present invention, when the image data (RGB data) is a gray-based image including white and black, a direct local dimming drive 228 including a third light source unit (180 of FIG. 1) is selected and driven or By driving to, high brightness and power consumption can be reduced.

When the image data (R, G, B Data) analyzed by the image data analyzer 221 is a brilliant color image in which a plurality of colors are mixed, the LED driver 223 controls the selection unit 225 to perform an edge method. The scanning drive 227 is selected. Here, the LED driver 223 may select the edge scanning drive 227 as the main by adjusting the dimming value, and select the direct local dimming driving 228 as the sub.

According to the present invention, when the image data (R, G, B Data) is a brilliant color image in which a plurality of colors are mixed, the edge type scanning driving in which the first and second light source units 150a and 150b of FIG. 1 are driven ( 227 is selected and driven or driven to the main, thereby preventing the afterimage and improving the color reproducibility.

As described above, the liquid crystal display of the present invention has first and second light source units (150a and 150b in FIG. 1) disposed on the side to emit red, green and blue light, and disposed below to emit white light. And a third light source unit (180 of FIG. 1), and the first and second light source units 150a and 150b of FIG. 1 are driven by analyzing image data R, G, and B data. By selecting the edge-type local dimming drive 228 in which the edge type scanning drive 227 or the third light source unit 180 of FIG. 1 is driven, not only the color reproducibility can be improved but also high luminance can be realized.

5 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention, and FIG. 6 is a plan view illustrating the light source unit of FIG. 5.

5 and 6, the liquid crystal display according to another exemplary embodiment of the present invention is the same as the liquid crystal display according to the exemplary embodiment of the present invention, except that the backlight unit 320 has the same configuration. The configuration except for 320) denotes the same reference numerals and detailed description thereof will be omitted.

The backlight unit 320 according to another embodiment of the present invention includes a bottom cover 380 having an upper surface, a plurality of light source units 350 disposed on the bottom cover 380, and a plurality of light source units ( And a diffusion plate 340 disposed on the 350 and optical sheets 330 disposed on the diffusion plate 340.

The light source unit 350 of the present invention has a structure divided into four, but is not limited to this, the structure and the number divided into a bar type can be changed.

The light source unit 350 may include a plurality of white light emitting diodes 353 mounted on the printed circuit board 351 at regular intervals, and a plurality of red, green, and white parts spaced apart from the white light emitting diodes 353. And a blue light emitting diode 355.

The white light emitting diode 353 has a structure in which a lens is formed thereon or a structure in which the lens is removed.

The white light emitting diode 353 is locally dimmed in units of a first block LB in which one block is divided into four, six, eight, and the like squares.

The red, green and blue light emitting diodes 355 may be in a red-green-blue arrangement or in a red-green-green-blue arrangement.

The red, green, and blue light emitting diodes 355 are sequentially driven in units of second blocks SB divided in one direction.

Driving of the liquid crystal display according to another exemplary embodiment of the present invention is the same as driving according to the exemplary embodiment of FIG. 5.

That is, the backlight unit 320 of the present invention analyzes the image data and when the image data is a gray series image including white and black, the local dimming driving using the white light emitting diode 353 is selected and driven.

In addition, when the image data is analyzed and the image data is a gray-based image including white and black, the local dimming driving using the white light emitting diode 353 is driven mainly, and the red, green, and blue light emitting diodes 355 are driven. Scanning driving by using is driven to the sub.

The backlight unit 320 of the present invention analyzes the image data, and when the image data is a colorful image in which a plurality of colors are mixed, scanning driving using the red, green, and blue light emitting diodes 355 is selected and driven.

In addition, when the image data is analyzed and the image data is a colorful image in which a plurality of colors are mixed, the scanning driving using the red, green, and blue light emitting diodes 355 is mainly driven, and the local light using the white light emitting diodes 353 is used. Dimming drive is driven to the sub.

As described above, the liquid crystal display according to another exemplary embodiment of the present invention includes white light emitting diodes 353, red, green, and blue light emitting diodes 355 disposed at regular intervals from each other, and analyzes the image data to white. By selecting the local dimming driving using the light emitting diodes 353 and the scanning driving using the red, green, and blue light emitting diodes 344, not only the color reproducibility can be improved but also high luminance can be realized.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line II ′ of FIG. 1.

3 is a schematic view of a liquid crystal display according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a configuration of a driving unit that drives a backlight unit.

5 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention.

6 is a plan view illustrating the light source unit of FIG. 5.

Claims (14)

A first light source comprising red, green and blue light emitting diodes emitting red, green and blue light and driven in a scanning manner; A second light source comprising a white light emitting diode emitting white light and driven by a local dimming method; An image data analyzer analyzing the image data; And And a light source driver for selectively driving the first and second light sources according to the image data analyzed from the image data. The method according to claim 1, And a selector configured to select the first and second light sources according to a control signal of the light source driver. The method according to claim 1, And the light source driver drives one of the first and second light sources as a main according to the image data, and drives the other as a sub. The method according to claim 1, And the light source driver selects the second light source or drives the main light source when the image data is a gray series including white and black. The method according to claim 1, And the light source driver selects the first light source or drives the main light source when the image data is a colorful image in which a plurality of colors are mixed. The method according to claim 1, Further comprising a bottom cover for receiving the first and second light sources, And the first light source is disposed at both inner side surfaces of the bottom cover facing each other. The method according to claim 6, And a light guide plate divided into a plurality of parallel to the first light source. 8. The method of claim 7, And a dot pattern having a larger dot pattern and a larger dot pattern at a lower portion of the plurality of light guide plates to a region far from an area adjacent to the first light source. 8. The method of claim 7, A backlight unit, characterized in that the diffusion plate is provided below the light guide plate. The method of claim 9, And the second light source is provided under the diffusion plate. The method according to claim 1, The first light source may be a red-green-blue array or a red-green-green-blue array. The method according to claim 1, Further comprising a bottom cover for receiving the first and second light sources, The first and second light sources are disposed on the bottom cover, and the backlight unit is provided with a diffusion plate on the first and second light sources. 13. The method of claim 12, And the first and second light sources are disposed at regular intervals from each other. Driving a first light source emitting red, green and blue light in a scanning manner; Driving a second light source emitting white light in a local dimming manner; Analyzing image data; Generating a control signal for driving the first and second light sources according to the analyzed image data; And And selectively driving the first and second light sources according to the control signal.
KR1020090121458A 2009-12-08 2009-12-08 Back light unit and method driving of the same KR20110064742A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10698262B2 (en) 2017-12-27 2020-06-30 Samsung Electronics Co., Ltd. Display apparatus and method for control thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10698262B2 (en) 2017-12-27 2020-06-30 Samsung Electronics Co., Ltd. Display apparatus and method for control thereof

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