WO2010073793A1 - 液晶表示装置及びテレビ受信装置 - Google Patents
液晶表示装置及びテレビ受信装置 Download PDFInfo
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- WO2010073793A1 WO2010073793A1 PCT/JP2009/067328 JP2009067328W WO2010073793A1 WO 2010073793 A1 WO2010073793 A1 WO 2010073793A1 JP 2009067328 W JP2009067328 W JP 2009067328W WO 2010073793 A1 WO2010073793 A1 WO 2010073793A1
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- liquid crystal
- backlight
- dimming signal
- fluorescent tube
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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
- G09G3/3406—Control of illumination source
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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
- G09G3/3611—Control of matrices with row and column drivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/66—Transforming electric information into light information
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Definitions
- the present invention relates to a liquid crystal display device and a television receiver including the liquid crystal display device, and more particularly to power saving of a backlight having a fluorescent tube driven at both ends in the liquid crystal display device.
- a backlight using a discharge tube such as a CCFL (Cold Cathode Fluorescent Tube) is known as a backlight of a liquid crystal display device such as a liquid crystal television, and recently, a backlight using a number of LEDs (Light Emitting Diode) is also known. It has been.
- the power consumption of the liquid crystal display device is higher by the backlight than the liquid crystal panel. Therefore, it is necessary to reduce the power consumption of the backlight in order to suppress an increase in power consumption accompanying an increase in the size of the liquid crystal display device.
- Patent Document 1 As a technique for reducing the power consumption of the backlight, for example, in Patent Document 1, when there is no video signal to be displayed on the liquid crystal panel in the standby mode or the like, an auxiliary screen is displayed on the liquid crystal panel. A technique for turning off an LED corresponding to a black display portion is disclosed. JP 2007-86390 A
- the present invention has been completed on the basis of the above-described circumstances, and easily enables power saving of a backlight using a fluorescent tube driven at both ends corresponding to the entire liquid crystal panel.
- An object is to provide a liquid crystal display device and a television receiver including the liquid crystal display device.
- a liquid crystal display device includes a liquid crystal panel that displays an image, a backlight that illuminates the liquid crystal panel from the back, one end that receives a first dimming signal, and a second one.
- a backlight having a second end receiving the dimming signal and including a fluorescent tube driven at both ends; and generating the first dimming signal and the second dimming signal;
- a backlight control unit that supplies the fluorescent tube to control the light emission luminance of the backlight; controls the liquid crystal panel and the backlight based on a video signal; and displays the black image based on the video signal
- a video signal processing unit for detecting that the image is an image, and the backlight control unit is configured to detect one of the first dimming signal and the second dimming signal in response to detection of the black display image. Dimming Stopping the supply to the fluorescent tube No..
- the backlight control unit has the fluorescent tube of one of the first dimming signal and the second dimming signal in response to detection of the black display image by the video signal processing unit. Stop supplying to For this reason, it is possible to easily reduce the power consumption of a backlight that uses a fluorescent tube driven at both ends corresponding to the entire liquid crystal panel.
- the backlight control unit is configured to control the backlight of the first dimming signal and the second dimming signal based on the other dimming signal supplied to the fluorescent tube.
- the emission brightness may be reduced. According to such a configuration, the power consumption of the backlight can be further reduced.
- the first and second dimming signals are burst signals for alternately switching between the lighting state and the extinguishing state of the fluorescent tube, and the backlight control unit detects the other black display image in response to detection of the black display image. You may make it reduce the amplitude and / or duty ratio of a light control signal. According to such a configuration, when the backlight is configured by a fluorescent tube, the power consumption of the backlight can be further reduced by a simple and preferable method.
- the backlight includes a plurality of the fluorescent tubes arranged in parallel, and one end of each fluorescent tube to which supply of the dimming signal is stopped in response to detection of the black display image is alternately arranged.
- the first dimming signal and the second dimming signal may be supplied to each fluorescent tube. According to such a configuration, when the driving of one end of each fluorescent tube is stopped, the one end where the driving is stopped is alternated, so that it is possible to suppress the uneven emission luminance in the backlight.
- the television receiver of the present invention includes the liquid crystal display device. According to this configuration, with the power saving of the liquid crystal display device, the power of the television receiver is also saved.
- a liquid crystal display device that can easily save power in a backlight that uses a fluorescent tube driven at both ends, corresponding to the entire liquid crystal panel, and a television receiver including the liquid crystal display device. be able to.
- FIG. 1 is a block diagram schematically showing an electrical configuration of a television receiver according to an embodiment of the present invention.
- Schematic cross-sectional view showing a configuration example of a liquid crystal display device Schematic plan view showing a configuration example of a backlight of a liquid crystal display device
- Time chart schematically showing the time transition of each signal related to backlight power saving control Schematic time chart showing another example of backlight power-saving control
- Schematic time chart showing another example of backlight power-saving control Schematic plan view showing another configuration example of a backlight of a liquid crystal display device
- Numerals 31, 31A Double-end drive fluorescent tube, 100 ... Liquid crystal display device, 102 ... Video signal processing unit, 104 ... Liquid crystal panel, 107 ... Backlight control unit, 108 ... Dimming control circuit (backlight control unit), 109 ... Inverter (Backlight control unit), 110 ... backlight, 200 ... television receiver, Sdv1 ... first dimming signal, Sdv2 ... second dimming signal
- a television receiver including the liquid crystal display device according to the present invention is illustrated.
- the present invention is not limited to this, and the liquid crystal display device according to the present invention can be applied to any device that requires image display, such as a personal computer, a game machine, and a measuring instrument.
- FIG. 1 is a schematic block diagram showing a configuration of a television reception device 200 including a liquid crystal display device 100 according to the present invention.
- the tuner 112 selects a channel from the television broadcast signal received by the antenna 111.
- the video input terminal 113 inputs a video signal from an AV device built in the television receiver 200 or externally connected.
- the switching unit 114 switches and outputs the television broadcast signal selected by the tuner 112 and the video signal input via the video input terminal 113.
- the video signal Si switched and output from the switching unit 114 is subjected to video processing in the video signal processing unit 102 of the liquid crystal display device 100.
- the audio signal output from the switching unit 114 is processed by the audio processing unit 115 and output from the speaker 116 as audio.
- the remote control light receiving unit 117 receives a remote control operation signal by infrared rays transmitted from the remote control device 120, and sends it to the control unit 118.
- the control unit 118 detects and analyzes the remote control operation signal received by the remote control light receiving unit 117, and performs operations on the tuner 112, the switching unit 114, the video signal processing unit 102, the LCD control unit 103, the audio processing unit 115, and the like.
- a control signal for controlling is output.
- the liquid crystal display device 100 includes a video signal processing unit 102, an LCD (liquid crystal display device) control unit 103, a liquid crystal panel 104, a backlight control unit 107, and a backlight 110.
- a video signal processing unit 102 an LCD (liquid crystal display device) control unit 103
- a liquid crystal panel 104 a liquid crystal panel 104
- a backlight control unit 107 a backlight 110.
- the video signal processing unit 102 processes the video signal Si input to the liquid crystal display device 100 or the video signal Si read from a recording medium of a recording / reproducing device (not shown) built in the liquid crystal display device 100.
- the image signal Si is subjected to various image quality adjustment processes as necessary to generate an image display signal such as RGB suitable for driving the liquid crystal panel 104 and output it to the LCD control unit 103.
- the video signal processing unit 102 generates a backlight control signal such as a vertical synchronization signal Vsyn that is output to the backlight control unit 107, and performs light emission control of the backlight 110.
- the video signal processing unit 102 calculates an average luminance level (APL; Average Picture Level) based on the video signal Si, and generates an APL signal corresponding to the APL.
- APL average luminance level
- the black display determination value Ath is set as a value of 3% or less, for example.
- the APL signal and the black display detection signal Sb are supplied to the backlight control unit 107.
- the LCD control unit 103 generates LCD data that is light transmittance data of each pixel of the liquid crystal panel 104 in accordance with an image display signal from the video signal processing unit 102.
- the LCD control unit 103 generates an LCD drive signal according to the LCD data, supplies the LCD drive signal to the liquid crystal panel 104, and performs image display control on the liquid crystal panel 104.
- the liquid crystal panel 104 has, for example, a rectangular shape in plan view, and is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the two glass substrates.
- One glass substrate is provided with a switching element (for example, TFT (thin film transistor)) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the other glass substrate is provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, a common electrode, and an alignment film.
- color pixels of 1920 ⁇ 1080 dots for high vision are formed in the liquid crystal panel 104.
- an LCD driver is provided in the liquid crystal panel 104.
- the LCD driver controls the switching element of each pixel according to the LCD drive signal from the LCD control unit 103, so that an image corresponding to the video signal Si is displayed on the liquid crystal panel 104.
- the backlight control unit 107 includes a dimming control circuit 108 and an inverter 109.
- the backlight control unit 107 generates a first dimming signal Sdv1 and a second dimming signal Sdv2 for reducing the light emission luminance of the backlight 110 in response to the detection of the black display image of the video signal processing unit 102, and the first dimming signal Sdv2 is generated.
- the dimming signal Sdv1 and the second dimming signal Sdv2 are supplied to the backlight 110 (see FIGS. 3 and 4).
- the dimming control circuit 108 is a pulse width modulation (PWM) signal in which the signal period ratio (duty ratio) between the high potential level and the low potential level of the rectangular wave changes according to the APL signal from the video signal processing unit 102. 1 control signal Scn1 and 2nd control signal Scn2 are produced
- PWM pulse width modulation
- the inverter 109 basically has a well-known configuration, and in response to the first control signal Scn1 and the second control signal Scn2, the first dimming signal Sdv1 and the second dimming signal Sdv2 that are burst AC voltages, respectively. Is generated.
- the first dimming signal Sdv1 and the second dimming signal Sdv2 are applied to the backlight 110 as drive signals for the fluorescent tubes 31 driven at both ends (see FIG. 3).
- the inverter 109 performs a switching operation when the control signals (Scn1, Scn2) are at a high potential level, stops the switching operation when the control signals (Scn1, Scn2) are at a low potential level, and is intermittent according to the duty ratio of the control signals (Scn1, Scn2).
- burst dimming signals Sdv1, Sdv2 are generated (see FIG. 4).
- the brightness of the backlight 110 is adjusted by the duty ratio and amplitude of the burst dimming signals (Sdv1, Sdv2).
- the backlight 110 irradiates the liquid crystal panel 104 with light from the back, and the liquid crystal panel 104 forms an image by controlling the transmission amount of the irradiated light.
- the backlight 110 according to the present embodiment includes a housing 30 attached to the back surface of the liquid crystal panel 104.
- a plurality of thin tube (straight tube type) fluorescent tubes driven at both ends, for example, CCFLs (cold cathode fluorescent tubes) 31 are arranged in parallel in the housing 30 at equal intervals.
- CCFLs cold cathode fluorescent tubes
- FIG. 3 shows a state in which each fluorescent tube 31 is driven on one side in response to detection of a black display image on the liquid crystal panel 104.
- Each fluorescent tube 31 is driven to turn on by a first dimming signal Sdv1 and a second dimming signal Sdv2 applied to both ends thereof. Further, the diffusing plate 32 uniformly diffuses the illumination light emitted from each fluorescent tube 31. Such a fluorescent tube 31 that is driven at both ends is used particularly for a large liquid crystal panel 104.
- the first dimming signal Sdv1 and the second dimming signal Sdv2 are supplied to both ends of the two adjacent fluorescent tubes 31, respectively.
- the signals Sdv2 are supplied to the fluorescent tubes 31 so that they are staggered.
- one end of each fluorescent tube 31 to which the supply of the dimming signal is stopped in response to detection of a black display image on the liquid crystal panel 104 is alternated (see FIG. 3). This is for suppressing unevenness of the light emission luminance of the light 110.
- FIG. 4 is a time chart schematically showing the temporal transition of each signal related to the power saving control of the backlight.
- the APL value calculated by the video signal processing unit 102 is, for example, approximately “0”%. It falls and falls below the black display determination value Ath (for example, 3%).
- the video signal processing unit 103 detects black display of the display image and generates a black display detection signal Sb.
- the black display detection signal Sb is supplied to the dimming control circuit 108.
- the black display determination value Ath is appropriately set as an APL value for determining black display.
- the black display determination value Ath may be changed according to the type of image displayed on the liquid crystal panel 104.
- the dimming control circuit 108 of the backlight control unit 107 Upon receiving the black display detection signal Sb, the dimming control circuit 108 of the backlight control unit 107 sets the duty ratio of the second control signal Scn2 to 0% as shown in FIG. The generation of the signal Sdv2 is stopped. That is, at time t1 in FIG. 4, each fluorescent tube 31 is driven on one side by the first dimming signal Sdv1 (see FIG. 3). Therefore, the power consumption of the backlight 110 is reduced. At this time, the emission luminance Lca of the backlight 110 is reduced to a predetermined level after time t1, as shown in FIG.
- the discharge of the fluorescent tube 31 is not completely stopped. Therefore, when the display on the liquid crystal panel 104 changes from black display and the second dimming signal Sdv2 is applied to one end of the fluorescent tube 31 that is not driven to increase the light emission luminance Lca, the fluorescent tube 31 is driven smoothly. Can be done.
- the dimming control circuit 108 of the backlight control unit 107 responds to the detection of the black display image by the video signal processing unit 102 and the first dimming signal Sdv1 and the second dimming signal.
- the supply of the second dimming signal Sdv2 to each fluorescent tube 31 is stopped among the optical signals Sdv2.
- a configuration that is normally provided for driving and controlling the fluorescent tube 31 that is driven at both ends can be used. Therefore, in the case where the fluorescent tube 31 driven at both ends is used, power saving of the backlight 110 corresponding to the entire liquid crystal panel 104 can be easily achieved without adding a costly configuration.
- the first dimming signal Sdv1 and the second dimming signal Sdv2 are supplied to both ends of two adjacent fluorescent tubes 31, respectively.
- the signals Sdv2 are supplied to the fluorescent tubes 31 so that they are staggered. That is, the first dimming signal Sdv1 and the second dimming signal so that one end of each fluorescent tube 31 to which the supply of the dimming signal (Sdv1 or Sdv2) is stopped in response to detection of the black display image is alternated.
- Sdv2 is supplied to each fluorescent tube 31.
- the first dimming signal Sdv1 and the second dimming signal Sdv2 are applied to both ends of each fluorescent tube 31.
- the backlights 110 are supplied together, it is possible to suppress the uneven emission luminance in the backlight 110.
- the first dimming signal Sdv1 is supplied to the left end of each fluorescent tube 31, and the second dimming signal Sdv2 is supplied to the right end of each fluorescent tube 31. The bias of the light emission luminance of the light 110 is suppressed.
- the display of the liquid crystal panel 104 is changed from the black display.
- the light emission luminance Lca can be increased smoothly.
- the dimming control circuit 108 when the dimming control circuit 108 receives the black display detection signal Sb, as shown in FIG. 4, the first control signal Scn1 is not changed, and the first dimming signal Sdv1
- the backlight control unit 107 reduces the amplitude and / or the duty ratio of the first dimming signal Sdv1 (corresponding to “the other dimming signal”) in response to detection of the black display image. You may do it.
- the dimming control circuit 108 reduces the duty ratio of the first control signal Scn1 (first dimming signal Sdv1) after time t1 when the black display detection signal Sb is received. Also good.
- FIG. 5 shows an example in which the duty ratio of the first dimming signal Sdv1 is decreased at time t1 and at time t2 after two frame periods (2V) from time t1. In this case, the power consumption of the backlight 110 can be further reduced as compared with the case where the duty ratio of the first dimming signal Sdv1 is not lowered. Note that the aspect of reducing the duty ratio of the first dimming signal Sdv1 is not limited to that shown in FIG. 5 and may be determined as appropriate according to the situation.
- FIG. 6 shows an example in which the amplitude of the first dimming signal Sdv1 is decreased at time t1 and at time t2 after two frame periods (2V) from time t1. Even in this case, the power consumption of the backlight 110 can be further reduced as compared with the case where the amplitude of the first dimming signal Sdv1 is not reduced.
- the aspect which reduces the amplitude of 1st light control signal Sdv1 is not restricted to what was shown by FIG. 6, What is necessary is just to be suitably determined according to a condition.
- the present invention is not limited thereto.
- the present invention can also be applied to a backlight 110 including a U-shaped fluorescent tube 31A driven at both ends.
- the black display of the liquid crystal panel 104 is detected based on the APL (average luminance level) is shown, but the present invention is not limited to this.
- it may be detected based on a black level signal included in the video signal Si, or based on an APL and a black level signal. Further, it may be detected based on the APL and the maximum luminance level.
- the black display of the liquid crystal panel 104 may be detected based on the video signal Si.
- the black display of the liquid crystal panel 104 is detected based on the APL (average luminance level) is shown, but the present invention is not limited to this.
- it may be detected based on a black level signal included in the video signal Si, or based on an APL and a black level signal. Further, it may be detected based on the APL and the maximum luminance level.
- the black display of the liquid crystal panel 104 may be detected based on the video signal Si.
- each fluorescent tube to which a dimming signal is supplied may be alternately switched between the two ends at a predetermined time during the black display period (after each time t1). That is, the dimming signal applied to each end of each fluorescent tube is obtained by changing the waveform of the first dimming signal Sdv1 and the waveform of the second dimming signal Sdv2 shown in FIG. It may be formed by alternately switching every time.
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Abstract
Description
上記開示された技術においては、TV映像信号等の映像信号がない場合(スタンバイモード等)において視聴者に好印象を与えつつ省電力化を図ることができる。しかしながら、映像信号がある場合において、表示画像によっては液晶パネル全体に渡ってバックライトの省電力化を好適に図れる場合がある。そのため、液晶パネル全体に対応したバックライトの省電力化を、簡易な方法によって図れる液晶表示装置が所望されている。液晶表示装置の大型化にともなって、バックライトには両端駆動の蛍光管が使用されるため、特に、両端駆動の蛍光管を使用する場合におけるバックライトの省電力化が所望されている。
上記課題を解決するために、本発明による液晶表示装置は、画像を表示する液晶パネルと、前記液晶パネルを背面から照明するバックライトであって、第1調光信号を受け取る一端と、第2調光信号を受け取る他端とを有し両端駆動される蛍光管を含むバックライトと、前記第1調光信号および前記第2調光信号を生成し、該第1および第2調光信号を前記蛍光管に供給して前記バックライトの発光輝度を制御するバックライト制御部と、映像信号に基づいて前記液晶パネルおよび前記バックライトを制御するとともに、前記映像信号に基づいて前記画像が黒表示画像であることを検出する映像信号処理部とを備え、前記バックライト制御部は、前記黒表示画像の検出に応じて、前記第1調光信号および前記第2調光信号のうち、一方の調光信号の前記蛍光管への供給を停止する。
本発明によれば、液晶パネル全体に対応した、両端駆動の蛍光管を使用するバックライトの省電力化を簡易に可能とする液晶表示装置及び当該液晶表示装置を備えたテレビ受信装置を提供することができる。
図1は、本発明に係る液晶表示装置100を備えたテレビ受信装置200の構成を示す概略的なブロック図である。テレビ受信装置200において、チューナ112は、アンテナ111によって受信されたテレビジョン放送信号からチャンネルを選局する。またビデオ入力端子113は、テレビ受信装置200に内蔵もしくは外部接続されたAV機器からのビデオ信号を入力する。そして切換部114において、チューナ112で選局されたテレビジョン放送信号とビデオ入力端子113を介して入力したビデオ信号とを切換出力する。切換部114から切換出力された映像信号Siは、液晶表示装置100の映像信号処理部102において映像処理される。
次に、液晶表示装置100について説明する。図1に示されるように、液晶表示装置100は、映像信号処理部102、LCD(液晶表示装置)制御部103、液晶パネル104、バックライト制御部107およびバックライト110を含む。
次に図3および図4を参照して、本発明によるバックライトの省電力制御について説明する。図4は、バックライトの省電力制御に係る各信号の時間的推移を概略的に示すタイムチャートである。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
Claims (5)
- 画像を表示する液晶パネルと、
前記液晶パネルを背面から照明するバックライトであって、第1調光信号を受け取る一端と、第2調光信号を受け取る他端とを有し両端駆動される蛍光管を含むバックライトと、
前記第1調光信号および前記第2調光信号を生成し、該第1および第2調光信号を前記蛍光管に供給して前記バックライトの発光輝度を制御するバックライト制御部と、
映像信号に基づいて前記液晶パネルおよび前記バックライトを制御するとともに、前記映像信号に基づいて前記画像が黒表示画像であることを検出する映像信号処理部とを備え、
前記バックライト制御部は、前記黒表示画像の検出に応じて、前記第1調光信号および前記第2調光信号のうち、一方の調光信号の前記蛍光管への供給を停止することを特徴とする液晶表示装置。 - 前記バックライト制御部は、前記黒表示画像の検出に応じて、前記第1調光信号および前記第2調光信号のうち、前記蛍光管に供給されている他方の調光信号による前記バックライトの発光輝度を低減させることを特徴とする、請求の範囲第1項に記載の液晶表示装置。
- 前記第1および第2調光調信号は、前記蛍光管の点灯状態と消灯状態とを交互に切り替えるバースト信号であり、
前記バックライト制御部は、前記黒表示画像の検出に応じて、前記他方の調光信号の振幅および/またはデューティ比を低下させることを特徴とする、請求の範囲第2項に記載の液晶表示装置。 - 前記バックライトは、並列配置される複数の前記蛍光管を含み、
前記黒表示画像の検出に応じて前記調光信号の供給が停止される各蛍光管の一端が、交互となるように、前記第1調光信号および前記第2調光信号が各蛍光管に供給される、請求の範囲第1項から請求の範囲第3項のいずれか一項に記載の液晶表示装置。 - 請求の範囲第1項から請求の範囲第4項のいずれか一項に記載の液晶表示装置を備えることを特徴とするテレビ受信装置。
Priority Applications (6)
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EP09834599A EP2378510A4 (en) | 2008-12-26 | 2009-10-05 | LIQUID CRYSTAL DISPLAY DEVICE AND TELEVISION RECEIVER DEVICE |
US12/998,986 US20110254872A1 (en) | 2008-12-26 | 2009-10-05 | Liquid crystal display device and television receiver |
JP2010543955A JPWO2010073793A1 (ja) | 2008-12-26 | 2009-10-05 | 液晶表示装置及びテレビ受信装置 |
RU2011125639/07A RU2011125639A (ru) | 2008-12-26 | 2009-10-05 | Жидкокристаллическое устройство отображения и телевизионный приемник |
BRPI0924181A BRPI0924181A2 (pt) | 2008-12-26 | 2009-10-05 | dispositivo de vídeo de cristal líquido e receptor de televisão |
CN2009801524270A CN102265328A (zh) | 2008-12-26 | 2009-10-05 | 液晶显示装置和电视接收装置 |
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JP2008-333286 | 2008-12-26 | ||
JP2008333286 | 2008-12-26 |
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US (1) | US20110254872A1 (ja) |
EP (1) | EP2378510A4 (ja) |
JP (1) | JPWO2010073793A1 (ja) |
CN (1) | CN102265328A (ja) |
BR (1) | BRPI0924181A2 (ja) |
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WO (1) | WO2010073793A1 (ja) |
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JPH08122776A (ja) * | 1994-10-24 | 1996-05-17 | Seiko Epson Corp | 液晶テレビ用バックライト |
JP2001272956A (ja) * | 2000-03-27 | 2001-10-05 | Canon Inc | 液晶表示装置及びその駆動方法 |
JP2004349040A (ja) * | 2003-05-21 | 2004-12-09 | Nec Lcd Technologies Ltd | バックライト装置及び液晶表示装置 |
JP2005190991A (ja) * | 2003-12-03 | 2005-07-14 | Sharp Corp | 照明装置およびそれを備えた表示装置 |
JP2006010794A (ja) * | 2004-06-23 | 2006-01-12 | Toshiba Corp | 液晶表示装置 |
JP2007086390A (ja) | 2005-09-22 | 2007-04-05 | Sharp Corp | Ledバックライト装置及び液晶表示装置 |
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JP3971892B2 (ja) * | 2000-09-08 | 2007-09-05 | 株式会社日立製作所 | 液晶表示装置 |
KR100911820B1 (ko) * | 2002-12-26 | 2009-08-12 | 엘지디스플레이 주식회사 | 액정표시장치의 인버터 및 이를 이용한 백라이트 램프검사장치 |
KR101159354B1 (ko) * | 2005-12-08 | 2012-06-25 | 엘지디스플레이 주식회사 | 인터버의 구동 장치 및 방법, 그리고 그를 이용한영상표시기기 |
JP5299741B2 (ja) * | 2007-10-24 | 2013-09-25 | Nltテクノロジー株式会社 | 表示パネルの制御装置、液晶表示装置、電子機器、表示装置の駆動方法、及び制御プログラム |
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2009
- 2009-10-05 WO PCT/JP2009/067328 patent/WO2010073793A1/ja active Application Filing
- 2009-10-05 EP EP09834599A patent/EP2378510A4/en not_active Withdrawn
- 2009-10-05 JP JP2010543955A patent/JPWO2010073793A1/ja not_active Ceased
- 2009-10-05 BR BRPI0924181A patent/BRPI0924181A2/pt not_active IP Right Cessation
- 2009-10-05 US US12/998,986 patent/US20110254872A1/en not_active Abandoned
- 2009-10-05 CN CN2009801524270A patent/CN102265328A/zh active Pending
- 2009-10-05 RU RU2011125639/07A patent/RU2011125639A/ru not_active Application Discontinuation
Patent Citations (6)
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JPH08122776A (ja) * | 1994-10-24 | 1996-05-17 | Seiko Epson Corp | 液晶テレビ用バックライト |
JP2001272956A (ja) * | 2000-03-27 | 2001-10-05 | Canon Inc | 液晶表示装置及びその駆動方法 |
JP2004349040A (ja) * | 2003-05-21 | 2004-12-09 | Nec Lcd Technologies Ltd | バックライト装置及び液晶表示装置 |
JP2005190991A (ja) * | 2003-12-03 | 2005-07-14 | Sharp Corp | 照明装置およびそれを備えた表示装置 |
JP2006010794A (ja) * | 2004-06-23 | 2006-01-12 | Toshiba Corp | 液晶表示装置 |
JP2007086390A (ja) | 2005-09-22 | 2007-04-05 | Sharp Corp | Ledバックライト装置及び液晶表示装置 |
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RU2011125639A (ru) | 2013-02-10 |
BRPI0924181A2 (pt) | 2016-02-10 |
CN102265328A (zh) | 2011-11-30 |
EP2378510A4 (en) | 2012-06-20 |
JPWO2010073793A1 (ja) | 2012-06-14 |
EP2378510A1 (en) | 2011-10-19 |
US20110254872A1 (en) | 2011-10-20 |
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