JP2016197507A - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- JP2016197507A JP2016197507A JP2015076247A JP2015076247A JP2016197507A JP 2016197507 A JP2016197507 A JP 2016197507A JP 2015076247 A JP2015076247 A JP 2015076247A JP 2015076247 A JP2015076247 A JP 2015076247A JP 2016197507 A JP2016197507 A JP 2016197507A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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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
- G09G3/3413—Details of control of colour illumination sources
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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
-
- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/12—Controlling the intensity of the light using optical feedback
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
-
- 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
-
- 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
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
【解決手段】液晶表示装置200は、液晶パネル220と、バックライト211a〜211cを有するバックライトパネル210と、デューティ比及び振幅を変更可能に、バックライト211a〜211cの駆動電流を出力するバックライト駆動回路600とを備え、バックライト駆動回路600は、バックライト211a〜211cの輝度が高いほど大きいデューティ比となるデューティ比特性と、所定輝度を基準として、前記所定輝度以下の第1領域と、前記所定輝度よりも高い第2領域とに分けられ、前記第1領域において輝度に対する前記駆動電流の振幅の変化率は所定変化率以下であり、前記第2領域において輝度に対する前記駆動電流の振幅の変化率は前記所定変化率よりも大きくなる振幅特性とに基づき、前記駆動電流を出力する。
【選択図】図1
Description
最初に、液晶表示装置において生じる動画ぼけの原理について説明する。
そこで、このような液晶表示装置における二重写りを抑制するために(すなわち、スキャン効果を得るために)点灯デューティ比を低下させ、信号電圧の書き換え時には、対応するバックライトを消灯させる構成が考えられる。
実施の形態1に係るバックライト駆動回路は、液晶パネルを照明するための複数のバックライトを、所定の範囲のなかから指定される1つの目標輝度で発光させるバックライト駆動回路であり、例えばテレビジョン受信機などで用いられる液晶表示装置に搭載される。
以下、実施の形態1に係るバックライト駆動回路の構成について説明する。
図1は、実施の形態1に係るバックライト駆動回路600が搭載される液晶表示装置200の構成を示すブロック図である。
次に、バックライト駆動回路600の詳細な構成について説明する。
次に、本実施の形態における液晶表示装置200の動作について、図面を用いて説明する。
バックライト駆動回路600が、各バックライト211に供給する駆動電流の振幅及びデューティ比の具体例について説明する。
次に、実施の形態1の変形例に係るバックライト駆動回路について説明する。
次に、実施の形態2に係るバックライト駆動回路について説明する。
上述の実施の形態1及び実施の形態2に係るバックライト駆動回路では、駆動電流の振幅が、第1領域において第1振幅に固定されたが、目標輝度に対する駆動電流の振幅特性は、このような例には限られない。
130、130a、130b、130c、131、131a、131b、131c バックライトドライバ
140、140a、140b、140c、141、141a、141b、141c 電流検出部
200 液晶表示装置(表示装置)
210 バックライトパネル
211、211a、211b、211c バックライト(光源)
220 液晶パネル(表示部)
221 液晶画素
410、510 タイミング指示部
411、511 SOC
620 電圧生成部
600、700、800 バックライト駆動回路(光源駆動部)
C21〜C23 コンデンサ
D21 ツェナーダイオード
Q21 トランジスタ
R21〜R25、R30〜R34 抵抗
Claims (10)
- 表示部と、
光源と、
前記光源の輝度に応じたデューティ比特性及び振幅特性に従って前記光源の駆動信号を出力する光源駆動部と、を備え、
前記振幅特性は、前記光源の所定輝度を基準として、前記所定輝度以下の第1領域と、前記所定輝度よりも高い第2領域とに分けられ、前記第1領域において前記光源の輝度に対する前記駆動信号の振幅の変化率は所定変化率以下であり、前記第2領域において前記第1領域の振幅特性と異なる振幅特性を有する、
表示装置。 - 前記振幅特性の前記第1領域は、直線又は曲線で示される、
請求項1に記載の表示装置。 - 前記振幅特性の前記第2領域において前記光源の輝度に対する前記駆動信号の振幅の変化率は前記所定変化率よりも大きくなる、
請求項1または2に記載の表示装置。 - 前記振幅特性の前記第2領域は、直線又は曲線で示される、
請求項1から3の何れか1項に記載の表示装置。 - 前記第1領域の輝度の範囲は、前記第2領域の輝度の範囲と等しいか又はより大きい、
請求項1から4の何れか1項に記載の表示装置。 - 前記デューティ比特性は、前記光源の輝度が高いほど大きいデューティ比を表す、
請求項1から5の何れか1項に記載の表示装置。 - 前記デューティ比特性は、前記所定輝度を基準として、前記所定輝度以下の第3領域と、前記所定輝度よりも高い第4領域とに分けられ、前記第3領域における前記光源の輝度に対する前記駆動信号のデューティ比の変化率は、前記第4領域における前記光源の輝度に対する前記駆動信号のデューティ比の変化率よりも小さい、
請求項1から6の何れか1項に記載の表示装置。 - 前記所定輝度における前記駆動信号のデューティ比は、前記表示部の応答速度に基づいて設定されている、
請求項1から7の何れか1項に記載の表示装置。 - 前記所定輝度における前記駆動信号の前記デューティ比は、前記表示部に書き込まれる所定透過率を示す信号電圧の期間のうち、前記表示部が実際に前記所定透過率になっている期間の割合と等しい、
請求項8に記載の表示装置。 - 前記駆動信号は駆動電流である、
請求項1から9の何れか1項に記載の表示装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015076247A JP6575113B2 (ja) | 2015-04-02 | 2015-04-02 | 表示装置 |
EP16163086.8A EP3076384A1 (en) | 2015-04-02 | 2016-03-31 | Display device |
CN201610197132.7A CN106057132A (zh) | 2015-04-02 | 2016-03-31 | 显示装置 |
US15/088,119 US10373568B2 (en) | 2015-04-02 | 2016-04-01 | Display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015076247A JP6575113B2 (ja) | 2015-04-02 | 2015-04-02 | 表示装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2016197507A true JP2016197507A (ja) | 2016-11-24 |
JP6575113B2 JP6575113B2 (ja) | 2019-09-18 |
Family
ID=55642336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2015076247A Active JP6575113B2 (ja) | 2015-04-02 | 2015-04-02 | 表示装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US10373568B2 (ja) |
EP (1) | EP3076384A1 (ja) |
JP (1) | JP6575113B2 (ja) |
CN (1) | CN106057132A (ja) |
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KR102126534B1 (ko) * | 2013-10-31 | 2020-06-25 | 엘지디스플레이 주식회사 | 광원 구동장치 및 이를 이용한 액정표시장치 |
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- 2016-03-31 CN CN201610197132.7A patent/CN106057132A/zh active Pending
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JP2011034071A (ja) * | 2009-07-07 | 2011-02-17 | Sharp Corp | 液晶表示装置 |
JP2014191111A (ja) * | 2013-03-26 | 2014-10-06 | Funai Electric Co Ltd | バックライト駆動回路 |
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US10373568B2 (en) | 2019-08-06 |
CN106057132A (zh) | 2016-10-26 |
JP6575113B2 (ja) | 2019-09-18 |
EP3076384A1 (en) | 2016-10-05 |
US20160293115A1 (en) | 2016-10-06 |
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