JP2006323300A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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JP2006323300A
JP2006323300A JP2005148507A JP2005148507A JP2006323300A JP 2006323300 A JP2006323300 A JP 2006323300A JP 2005148507 A JP2005148507 A JP 2005148507A JP 2005148507 A JP2005148507 A JP 2005148507A JP 2006323300 A JP2006323300 A JP 2006323300A
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light emitting
liquid crystal
linear light
moving image
display device
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Takayuki Ito
高幸 伊藤
Hiroyasu Kawachi
浩康 河内
Norihito Takeuchi
範仁 竹内
Masayuki Harada
昌幸 原田
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to JP2005148507A priority Critical patent/JP2006323300A/en
Priority to PCT/JP2006/309843 priority patent/WO2006123706A1/en
Priority to TW095117650A priority patent/TW200707370A/en
Publication of JP2006323300A publication Critical patent/JP2006323300A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—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
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
    • 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)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the occurrence of flickers and after-image phenomenon is suppressed, even when still image and moving image are mixed and displayed. <P>SOLUTION: A moving picture speed detection part 15, for detecting, the moving picture speed, by determining the difference between a display image displayed in a previous frame and that displayed in the present frame, is arranged. A light source control part 16 controls the on-duty period (ratio of light emission time of the linear light-emitting region to the frame period) of a linear light-emitting region according to a result of detection with the moving picture speed detection part 15 for the respective linear light-emitting regions. The light source control part 16 makes the on-duty period long, when the moving picture speed is low, and shortens it, when the moving picture speed is high. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、液晶パネルの背面にＥＬ素子を備えるバックライトが設けられた液晶表示装置に関する。   The present invention relates to a liquid crystal display device in which a backlight having an EL element is provided on the back surface of a liquid crystal panel.

液晶表示装置は、コンピュータ、携帯機器などの表示装置として広く用いられている。近年、これらの表示装置では静止画像だけでなく動画像の表示もなされる。しかし、液晶表示装置は、動画像を表示した際に、ＣＲＴ（Cathode Ray Tube）に比較して、画質が悪い（残像が見えて動きがぼける）という問題がある。この原因としては、液晶は光を透過させる状態（透過状態）と、光の透過を阻止する状態（非透過状態）とに配列（配向）が変化するのに時間がかかり、バックライトが常時点灯していると、非透過状態に駆動される部分の配列変化が遅れることで残像が見えることが挙げられる。   Liquid crystal display devices are widely used as display devices for computers, portable devices, and the like. In recent years, these display devices display not only still images but also moving images. However, the liquid crystal display device has a problem that when moving images are displayed, the image quality is poor (afterimages are visible and motion is blurred) compared to CRT (Cathode Ray Tube). The reason for this is that it takes time for the liquid crystal to change its alignment (orientation) between a state that transmits light (transmission state) and a state that blocks light transmission (non-transmission state), and the backlight is always on. In this case, the afterimage can be seen by delaying the change in the arrangement of the portion driven to the non-transmissive state.

このような問題を解決するために、特許文献１に記載の発明が提案されている。特許文献１に記載の液晶表示装置では、動き検出手段を設け、その動き検出手段の結果から表示画像が静止画像であるか又は動画像であるかを検出して制御を行うようになっている。
特開２００２−９１４００号公報 In order to solve such a problem, the invention described in Patent Document 1 has been proposed. In the liquid crystal display device described in Patent Document 1, motion detection means is provided, and control is performed by detecting whether the display image is a still image or a moving image from the result of the motion detection means. .
JP 2002-91400 A

ところで、特許文献１に記載の液晶表示装置は、動き検出手段の検出結果に応じて静止画像表示時の制御又は動画像表示時の制御の何れかを優先して行う構成となっている。例えば、特許文献１に記載の液晶表示装置は、バックライトを全面点灯させることを前提とし、表示画像の動きが所定値未満であるか否かによって点灯方式を連続点灯又は間欠点灯としている。このため、特許文献１に記載の液晶表示装置では、選択された制御方式に合致した画像の表示領域においては想定される効果を得られる可能性が高くなる反面、合致しない画像の表示領域においてはフリッカや動きぼけが発生する虞がある。例えば、静止画像表示時の制御を選択した場合において、静止画像の表示領域ではフリッカの抑制が図られるが、該静止画像と同時に表示された動画像の表示領域では静止画像表示時の制御によって動きぼけが発生する虞がある。したがって、特許文献１に記載の液晶表示装置では、特に、静止画像と動画像とが混在する場合において、その画像種毎に発生し得る課題を解決しているとは言い難い。   By the way, the liquid crystal display device described in Patent Document 1 is configured to give priority to either the control at the time of still image display or the control at the time of moving image display according to the detection result of the motion detection means. For example, the liquid crystal display device described in Patent Document 1 is based on the premise that the backlight is entirely lit, and the lighting method is set to continuous lighting or intermittent lighting depending on whether or not the movement of the display image is less than a predetermined value. For this reason, in the liquid crystal display device described in Patent Document 1, there is a high possibility that an expected effect can be obtained in an image display area that matches the selected control method, but in an image display area that does not match. Flicker and motion blur may occur. For example, when the control at the time of still image display is selected, flicker is suppressed in the display area of the still image, but in the display area of the moving image displayed simultaneously with the still image, the motion is controlled by the control at the time of still image display. There is a risk of blurring. Therefore, in the liquid crystal display device described in Patent Document 1, it is difficult to say that the problem that may occur for each image type is solved particularly when a still image and a moving image are mixed.

この本発明は、このような従来の技術に存在する問題点に着目してなされたものであり、その目的は、静止画像と動画像が混在して表示される場合においても、フリッカの発生と動きぼけの発生とを抑制することができる液晶表示装置を提供することにある。   The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to prevent occurrence of flicker even when still images and moving images are displayed together. An object of the present invention is to provide a liquid crystal display device capable of suppressing the occurrence of motion blur.

本発明の液晶表示装置は、液晶パネルと、前記液晶パネルの背面に設けられたＥＬ素子を備えるバックライトと、前記液晶パネル及び前記バックライトを制御する制御部とを備える液晶表示装置であって、前記バックライトは液晶パネルの垂直走査方向と直交する方向に延びる複数の線状発光領域から構成される面状の発光面を有しており、前記制御部は、前記複数の線状発光領域を、前記液晶パネルの垂直走査に同期して順に発光状態と非発光状態とに切替制御し、入力画像信号から表示画像の動画速度を検出する動画速度検出部とを備え、前記制御部は、前記動画速度検出部の検出結果に応じて、前記線状発光領域毎に、前記動画速度が遅い場合には１フレームにおける前記線状発光領域の発光期間を長くし、前記動画速度が早い場合には前記線状発光領域の発光期間を前記動画速度が遅い場合よりも短くするように、前記バックライトを切替制御する。   The liquid crystal display device of the present invention is a liquid crystal display device including a liquid crystal panel, a backlight including an EL element provided on the back surface of the liquid crystal panel, and a controller that controls the liquid crystal panel and the backlight. The backlight has a planar light emitting surface composed of a plurality of linear light emitting regions extending in a direction perpendicular to the vertical scanning direction of the liquid crystal panel, and the control unit includes the plurality of linear light emitting regions. And a moving image speed detecting unit that detects the moving image speed of the display image from the input image signal by sequentially switching the light emitting state and the non-light emitting state in synchronization with the vertical scanning of the liquid crystal panel, and the control unit includes: Depending on the detection result of the moving image speed detection unit, when the moving image speed is slow for each linear light emitting region, the light emitting period of the linear light emitting region in one frame is lengthened, and when the moving image speed is high. The emission period of the linear light emitting region so as to be shorter than when the moving speed is slow, controls to switch the backlight.

これによれば、バックライトの発光面が複数の線状発光領域に分割され、その線状発光領域毎に動画速度検出部の検出結果に応じて線状発光領域の発光期間（オンデューティ）が調整される。動画速度は、前回のフレームで表示された表示画像に対して今回のフレームで表示される表示画像の動き量を示すものであり、該動き量が大きいほど動画速度は速く、該動き量が小さいほど動画速度は遅くなる。なお、オンデューティは、１フレーム期間において線状発光領域が発光する期間の割合を示す。そして、本発明では、動画速度が早い表示領域においてオンデューティを小さくして線状発光領域の発光時間を短くし、動画速度が遅い表示領域においてオンデューティを大きくして線状発光領域の発光時間を長くしており、分割された線状発光領域に対応する液晶の表示領域毎にオンデューティが調整される。このため、静止画像と動画像が混在して表示される場合であっても、分割された領域毎にオンデューティが調整されるので、画像種に起因して発生するフリッカや動きぼけ（残像現象）が同時に抑制され、画質を向上し得る。   According to this, the light emitting surface of the backlight is divided into a plurality of linear light emitting regions, and the light emitting period (on duty) of the linear light emitting region is determined for each linear light emitting region according to the detection result of the moving image speed detecting unit. Adjusted. The moving image speed indicates the amount of movement of the display image displayed in the current frame with respect to the display image displayed in the previous frame. The larger the amount of movement, the faster the moving image speed and the smaller the amount of movement. The slower the video speed. The on-duty indicates a ratio of a period during which the linear light emitting region emits light in one frame period. In the present invention, the on-duty is reduced in the display area where the moving image speed is fast to shorten the light emitting time of the linear light emitting area, and the on duty is increased in the display area where the moving image speed is slow to increase the light emitting time of the linear light emitting area. The on-duty is adjusted for each display area of the liquid crystal corresponding to the divided linear light-emitting areas. For this reason, even when still images and moving images are mixedly displayed, the on-duty is adjusted for each divided area, so flicker and motion blur (afterimage phenomenon) caused by the image type. ) Are simultaneously suppressed, and the image quality can be improved.

また、前記動画速度検出部は、前回のフレームと今回のフレームにおける各表示画像の変化量を差分で求めることにより、前記動画速度を検出しても良い。
また、前記動画速度検出部は、前記液晶パネルの垂直走査方向の動画速度を検出しても良い。 In addition, the moving image speed detection unit may detect the moving image speed by obtaining a difference in a change amount of each display image between the previous frame and the current frame.
The moving image speed detection unit may detect a moving image speed in a vertical scanning direction of the liquid crystal panel.

また、前記制御部は、前記線状発光領域毎に、当該線状発光領域に対応する液晶の書き替えが完了した否かを判定し、この判定結果が肯定の場合であって前記書き替えが前記液晶パネルの垂直走査時間の経過時までに完了するときには前記線状発光領域の発光期間を長くし、前記書き替えが前記垂直走査時間の経過後に完了するときには前記線状発光領域の発光期間を短くするように前記バックライトを切替制御しても良い。   Further, the control unit determines, for each linear light emitting area, whether or not the rewriting of the liquid crystal corresponding to the linear light emitting area is completed, and when the determination result is affirmative, the rewriting is performed. When the vertical scanning time of the liquid crystal panel is completed, the light emission period of the linear light emitting region is lengthened. When the rewriting is completed after the vertical scanning time has elapsed, the light emission period of the linear light emitting region is increased. The backlight may be controlled to be shortened.

本発明によれば、静止画像と動画像が混在して表示される場合においても、フリッカの発生と動きぼけの発生とを抑制することができる。   According to the present invention, it is possible to suppress occurrence of flicker and motion blur even when still images and moving images are displayed in a mixed manner.

以下、本発明を具体化した一実施形態を図１〜図４にしたがって説明する。
図１は、本実施形態の液晶表示装置１１の主要部構成を示したブロック図である。本実施形態の液晶表示装置１１は、液晶パネル１２と、該液晶パネル１２を制御する液晶駆動部１３と、バックライト１４と、該バックライト１４を制御する光源制御部１６と、動画速度検出部１５とを備えている。本実施形態では、液晶駆動部１３と光源制御部１６とにより制御部が構成される。 Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram showing a main part configuration of a liquid crystal display device 11 of the present embodiment. The liquid crystal display device 11 of the present embodiment includes a liquid crystal panel 12, a liquid crystal drive unit 13 that controls the liquid crystal panel 12, a backlight 14, a light source control unit 16 that controls the backlight 14, and a moving image speed detection unit. 15. In the present embodiment, the liquid crystal driving unit 13 and the light source control unit 16 constitute a control unit.

本実施形態の液晶パネル１２は、アクティブマトリックス型とされている。図２に示すように、液晶パネル１２は、一対の透明な基板１７，１８を備え、両基板１７，１８は所定の間隔を保った状態で、図示しないシール材により貼り合わされている。基板１７，１８は、例えば、ガラス製である。両基板１７，１８には、液晶１９が封止されている。バックライト１４側に配置される基板１７には、液晶１９と対向する面に画素電極２０と、画素電極２０に接続された薄膜トランジスタ（ＴＦＴ）２１とが多数形成されている。画素電極２０は、ＩＴＯ（インジウム錫酸化物）で形成されている。本実施形態の液晶パネル１２では、３個の画素電極２０が１組で１個の画素を構成している。また、基板１７には、液晶１９と反対側の面に偏光板２２が配設されている。   The liquid crystal panel 12 of this embodiment is an active matrix type. As shown in FIG. 2, the liquid crystal panel 12 includes a pair of transparent substrates 17 and 18, and the substrates 17 and 18 are bonded to each other with a sealing material (not shown) at a predetermined interval. The substrates 17 and 18 are made of glass, for example. A liquid crystal 19 is sealed between the substrates 17 and 18. On the substrate 17 disposed on the backlight 14 side, a large number of pixel electrodes 20 and thin film transistors (TFTs) 21 connected to the pixel electrodes 20 are formed on the surface facing the liquid crystal 19. The pixel electrode 20 is made of ITO (indium tin oxide). In the liquid crystal panel 12 of the present embodiment, the three pixel electrodes 20 constitute one pixel as a set. A polarizing plate 22 is disposed on the surface of the substrate 17 opposite to the liquid crystal 19.

基板１８には、液晶１９側の面にカラーフィルタ２３が形成され、カラーフィルタ２３上には全画素共通の透明電極２４が形成されている。透明電極２４もＩＴＯで形成されている。カラーフィルタ２３は、赤色、緑色及び青色の光を透過する領域２３ａ，２３ｂ，２３ｃがサブ画素を構成する各画素電極２０と対応するように配設されている。各領域２３ａ〜２３ｃは、ブラックマトリックス２５で区画されている。基板１８の液晶１９と反対側の面には、偏光板２６が形成されている。   A color filter 23 is formed on the surface of the substrate 18 on the liquid crystal 19 side, and a transparent electrode 24 common to all pixels is formed on the color filter 23. The transparent electrode 24 is also made of ITO. The color filter 23 is disposed so that the regions 23a, 23b, and 23c that transmit red, green, and blue light correspond to the pixel electrodes 20 that form the sub-pixels. Each region 23 a to 23 c is partitioned by a black matrix 25. A polarizing plate 26 is formed on the surface of the substrate 18 opposite to the liquid crystal 19.

液晶駆動部１３は、入力した画像信号と同期信号に基づき、液晶パネル１２のゲート電極（走査電極）に走査信号を供給して該ゲート電極を駆動するとともに、液晶パネル１２のソース電極（データ電極）にデータ信号を供給して該ソース電極を駆動する。   The liquid crystal driving unit 13 supplies a scanning signal to the gate electrode (scanning electrode) of the liquid crystal panel 12 based on the input image signal and the synchronization signal to drive the gate electrode, and the source electrode (data electrode) of the liquid crystal panel 12 ) Is supplied with a data signal to drive the source electrode.

バックライト１４は、液晶パネル１２の背面（表示面と反対側の面）側に配置される。本実施形態のバックライト１４は、面状の発光面を有し、当該面状の発光面がＥＬ（エレクトロルミネッセンス）素子で構成されている。図２に示すように、バックライト１４は、透明な基板２７上に形成された有機ＥＬ素子２８を備えている。有機ＥＬ素子２８は、基板２７側から透明電極（第１電極）２９と、有機層３０と、対向電極（第２電極）３１が順に積層されて形成されている。有機ＥＬ素子２８は、有機層３０が水分（水蒸気）及び酸素の悪影響を受けないように、保護膜３２で被覆されている。   The backlight 14 is disposed on the back surface (surface opposite to the display surface) of the liquid crystal panel 12. The backlight 14 of the present embodiment has a planar light emitting surface, and the planar light emitting surface is configured by an EL (electroluminescence) element. As shown in FIG. 2, the backlight 14 includes an organic EL element 28 formed on a transparent substrate 27. The organic EL element 28 is formed by laminating a transparent electrode (first electrode) 29, an organic layer 30, and a counter electrode (second electrode) 31 in this order from the substrate 27 side. The organic EL element 28 is covered with a protective film 32 so that the organic layer 30 is not adversely affected by moisture (water vapor) and oxygen.

本実施形態では、基板２７として透明なガラス基板が使用されている。また、透明電極２９が陽極を構成し、対向電極３１が陰極を構成する。透明電極２９は、公知の有機ＥＬ素子で透明電極として用いられるＩＴＯ（インジウム錫酸化物）により形成され、光透過性を有する。対向電極３１は、金属（例えば、アルミニウム）で形成され、光を反射する機能を有する。有機層３０は、例えば、透明電極２９側から順に正孔輸送層３３、発光層３４及び電子輸送層３５が積層されて形成されている。有機ＥＬ素子２８は、有機層３０からの光が基板２７側から取り出される（出射される）ボトムエミッションタイプに構成されている。保護膜３２は、例えば窒化ケイ素で形成されている。   In the present embodiment, a transparent glass substrate is used as the substrate 27. Further, the transparent electrode 29 forms an anode, and the counter electrode 31 forms a cathode. The transparent electrode 29 is made of ITO (indium tin oxide) used as a transparent electrode in a known organic EL element, and has light transmittance. The counter electrode 31 is made of metal (for example, aluminum) and has a function of reflecting light. The organic layer 30 is formed by, for example, laminating a hole transport layer 33, a light emitting layer 34, and an electron transport layer 35 in this order from the transparent electrode 29 side. The organic EL element 28 is configured as a bottom emission type in which light from the organic layer 30 is extracted (emitted) from the substrate 27 side. The protective film 32 is made of, for example, silicon nitride.

有機ＥＬ素子２８は、液晶パネル１２と対向する側に配置される透明電極２９が全ての発光領域に共通のベタ電極で構成され、透明電極２９より抵抗の低い材質で形成されるとともに有機層３０を挟んで透明電極２９と反対側に配置される複数の対向電極３１が線状（帯状）に形成されている。対向電極３１は、液晶パネル１２（液晶１９）の垂直走査方向（図２の左右方向）と直交する方向（図２の紙面と垂直方向）に延びるように形成されている。有機ＥＬ素子２８は、各対向電極３１と対向する領域が発光面となる。そして、有機ＥＬ素子２８の発光面は、図３に示すように、液晶パネル１２（液晶１９）の垂直走査方向と直交する方向に延びる複数の線状発光領域３６で構成されている。本実施形態では、有機ＥＬ素子２８の発光面を７つの線状発光領域３６に分割している。なお、図３は、バックライト１４の発光面を模式的に図示している。そして、各有機層３０及び対向電極３１は絶縁材からなる隔壁３７より線状発光領域３６に区画されている。   In the organic EL element 28, the transparent electrode 29 disposed on the side facing the liquid crystal panel 12 is formed of a solid electrode common to all light emitting regions, and is formed of a material having a lower resistance than the transparent electrode 29 and the organic layer 30. A plurality of counter electrodes 31 disposed on the opposite side of the transparent electrode 29 across the electrode are formed in a linear shape (band shape). The counter electrode 31 is formed so as to extend in a direction (perpendicular to the paper surface in FIG. 2) perpendicular to the vertical scanning direction (left-right direction in FIG. 2) of the liquid crystal panel 12 (liquid crystal 19). In the organic EL element 28, a region facing each counter electrode 31 is a light emitting surface. The light emitting surface of the organic EL element 28 is composed of a plurality of linear light emitting regions 36 extending in a direction orthogonal to the vertical scanning direction of the liquid crystal panel 12 (liquid crystal 19), as shown in FIG. In the present embodiment, the light emitting surface of the organic EL element 28 is divided into seven linear light emitting regions 36. FIG. 3 schematically shows the light emitting surface of the backlight 14. Each organic layer 30 and the counter electrode 31 are partitioned into linear light emitting regions 36 by partition walls 37 made of an insulating material.

図２に示すように、各線状発光領域３６の幅は、１画素分、すなわち、３個の領域２３ａ，２３ｂ，２３ｃの合計幅ではなく、複数画素分の領域２３ａ，２３ｂ，２３ｃの合計幅に形成されている。すなわち、線状発光領域３６は、複数列分の液晶パネル１２の画素領域を照明するのに必要な幅で形成されている。   As shown in FIG. 2, the width of each linear light emitting region 36 is not the total width of one pixel, that is, the three regions 23a, 23b, and 23c, but the total width of the regions 23a, 23b, and 23c for a plurality of pixels. Is formed. That is, the linear light emitting region 36 is formed with a width necessary for illuminating the pixel region of the liquid crystal panel 12 for a plurality of columns.

動画速度検出部１５は、１フレーム分の画像信号を記憶可能なフレームメモリ（デュアルポートＲＡＭ）と、減算器を備えている。１フレーム期間とは、液晶パネル１２の１画面を構成する画素の全てが走査される期間である。フレームメモリにおいては、書き込みポートから今回のフレームの画像信号を書き込み、同時並行的に読み出しポートから前回のフレーム（１フレーム前）の画像信号を読み出す。減算器は、今回のフレームの画像信号と前回のフレームの画像信号を用いて両画像信号の差分をとる。   The moving image speed detection unit 15 includes a frame memory (dual port RAM) capable of storing an image signal for one frame and a subtractor. One frame period is a period during which all pixels constituting one screen of the liquid crystal panel 12 are scanned. In the frame memory, the image signal of the current frame is written from the write port, and the image signal of the previous frame (one frame before) is read from the read port simultaneously. The subtracter calculates a difference between the image signals using the image signal of the current frame and the image signal of the previous frame.

本実施形態の動画速度検出部１５では、今回と前回の各画像信号の差分を減算器でとることにより、今回のフレームと前回のフレームで液晶パネル１２に表示される表示画像の変化量を検出する。変化量は、前回のフレームで表示された表示画像に対して今回のフレームで表示される表示画像の動き量が多いほど大きくなり、前記表示画像の動き量が少ないほど小さくなる。すなわち、変化量が大きくなる場合は、１フレーム期間が一定時間に定められているので、変化量が小さい場合に比して表示画像の動く速度（動画速度）が速くなっていることとなる。換言すれば、変化量が小さくなる場合は、変化量が大きい場合に比して表示画像の動く速度が遅くなっていることとなる。変化量が小さい場合の表示画像は、静止画像に近い画像となる。そして、動画速度検出部１５は、減算器の差分結果を光源制御部１６に出力する。なお、本実施形態において動画速度検出部１５は、液晶パネル１２の垂直走査方向の画像変化量を検出する。   The moving image speed detection unit 15 of the present embodiment detects the amount of change in the display image displayed on the liquid crystal panel 12 between the current frame and the previous frame by taking the difference between the current and previous image signals with a subtractor. To do. The amount of change increases as the amount of motion of the display image displayed in the current frame increases with respect to the display image displayed in the previous frame, and decreases as the amount of motion of the display image decreases. That is, when the amount of change is large, since one frame period is set to a certain time, the moving speed (moving image speed) of the display image is faster than when the amount of change is small. In other words, when the amount of change is small, the moving speed of the display image is slower than when the amount of change is large. The display image when the amount of change is small is an image close to a still image. Then, the moving image speed detection unit 15 outputs the difference result of the subtracter to the light source control unit 16. In the present embodiment, the moving image speed detection unit 15 detects the image change amount of the liquid crystal panel 12 in the vertical scanning direction.

光源制御部１６は、バックライト１４を構成する複数の線状発光領域３６を、液晶パネル１２の垂直走査（走査信号の出力）に同期して順に発光状態と非発光状態とに切替制御する（擬似インパルス駆動）。本実施形態のバックライト１４は、液晶表示装置１１の駆動時、つまり、液晶パネル１２に画像を表示している時においては、同時に複数の線状発光領域３６が発光している状態となっている。また、本実施形態において光源制御部１６は、図４に示すように、各線状発光領域３６の発光状態又は非発光状態への切替制御を１フレーム周期で行う。図４において、「Ｔｆ」は液晶表示装置１１の１フレーム期間を、「Ｔｒ」は液晶１９の応答時間を示す。また、「Ｔｆ／Ｎ」は、バックライトの分割数を「Ｎ」としたときの、１つの線状発光領域３６と対応する液晶１９の行（走査ライン）の垂直走査時間を示す。このため、１つの線状発光領域３６と対応する液晶１９について表示データの書き替えを開始した場合、書き替え開始から最終の行が書き替えられて液晶１９が応答し終えるまでに要する時間は、（Ｔｆ／Ｎ）＋Ｔｒとなる。   The light source control unit 16 controls switching of the plurality of linear light emitting areas 36 constituting the backlight 14 between a light emitting state and a non-light emitting state in order in synchronization with vertical scanning (output of scanning signals) of the liquid crystal panel 12 ( Pseudo impulse drive). When the liquid crystal display device 11 is driven, that is, when an image is displayed on the liquid crystal panel 12, the backlight 14 of the present embodiment is in a state where a plurality of linear light emitting regions 36 emit light simultaneously. Yes. In the present embodiment, the light source control unit 16 performs switching control of each linear light emitting region 36 to a light emitting state or a non-light emitting state at a cycle of one frame as shown in FIG. In FIG. 4, “Tf” indicates one frame period of the liquid crystal display device 11, and “Tr” indicates the response time of the liquid crystal 19. “Tf / N” indicates a vertical scanning time of a row (scanning line) of the liquid crystal 19 corresponding to one linear light emitting region 36 when the number of backlight divisions is “N”. For this reason, when rewriting display data for the liquid crystal 19 corresponding to one linear light emitting region 36 is started, the time required from the start of rewriting until the last line is rewritten and the liquid crystal 19 finishes responding is: (Tf / N) + Tr.

光源制御部１６は、垂直走査時間「Ｔｆ／Ｎ」と応答時間「Ｔｒ」とを考慮し、各線状発光領域３６を非発光状態から発光状態に切替制御する。図４において斜線を付した部分は発光状態を示す。   The light source controller 16 controls each linear light emitting region 36 from the non-light emitting state to the light emitting state in consideration of the vertical scanning time “Tf / N” and the response time “Tr”. In FIG. 4, the hatched portion indicates the light emission state.

そして、本実施形態の光源制御部１６は、動画速度検出部１５（減算器）からの差分結果を入力し、その差分結果に基づき、線状発光領域３６毎の発光時間を可変制御する。すなわち、各線状発光領域３６が、１フレーム期間において発光する期間の割合を示すオンデューティを可変（調整）する。   Then, the light source control unit 16 of the present embodiment inputs the difference result from the moving image speed detection unit 15 (subtracter), and variably controls the light emission time for each linear light emitting region 36 based on the difference result. That is, each linear light emitting region 36 varies (adjusts) the on-duty indicating the ratio of the period during which light is emitted in one frame period.

光源制御部１６は、動画速度検出部１５からの差分結果をもとに、各線状発光領域３６に対応する液晶１９について今回のフレームで書き替えられる行（以下、「書替行」と示す）を抽出する。表示データの書き替えは液晶駆動部１３により行われ、液晶駆動部１３は、液晶１９の走査領域を上から下に向かって順に垂直走査する。そして、光源制御部１６は、線状発光領域３６毎に、最後の書替行の書き替えが垂直走査時間「Ｔｆ／Ｎ」の経過よりも前に完了するか否かを判定する。   The light source control unit 16 rewrites the liquid crystal 19 corresponding to each linear light emitting region 36 in the current frame based on the difference result from the moving image speed detection unit 15 (hereinafter, referred to as “rewrite line”). To extract. The rewriting of display data is performed by the liquid crystal driving unit 13, and the liquid crystal driving unit 13 performs vertical scanning in order from the top to the bottom of the scanning area of the liquid crystal 19. Then, the light source control unit 16 determines, for each linear light emitting region 36, whether or not the rewriting of the last rewriting row is completed before the vertical scanning time “Tf / N” elapses.

この判定結果が肯定の場合、１つの線状発光領域３６に対応する液晶１９は、垂直走査時間「Ｔｆ／Ｎ」の経過前に全ての行の表示データの書き替えが完了していることになる。したがって、光源制御部１６は、対応する１つの線状発光領域３６を、対応する液晶１９の最初の行から書き替えられる最後の行までの垂直走査期間と、当該最後の書替行に対応する液晶１９の応答時間Ｔｒの経過時に、非発光状態から発光状態に切替制御する。   If the determination result is affirmative, the liquid crystal 19 corresponding to one linear light emitting region 36 has been completely rewritten with display data of all rows before the vertical scanning time “Tf / N” has elapsed. Become. Therefore, the light source control unit 16 corresponds to the corresponding linear light emitting region 36 in the vertical scanning period from the first row of the corresponding liquid crystal 19 to the last row to be rewritten and the last rewritten row. When the response time Tr of the liquid crystal 19 elapses, the non-light emitting state is switched to the light emitting state.

一方、前記判定結果が否定の場合、１つの線状発光領域３６に対応する液晶１９は、垂直走査時間「Ｔｆ／Ｎ」の経過後に全ての行の表示データの書き替えが完了することになるので、光源制御部１６は、対応する１つの線状発光領域３６を、時間「（Ｔｆ／Ｎ）＋Ｔｒ」の経過時に非発光状態から発光状態に切替制御する。   On the other hand, when the determination result is negative, the liquid crystal 19 corresponding to one linear light emitting region 36 completes rewriting of display data of all rows after the vertical scanning time “Tf / N” has elapsed. Therefore, the light source control unit 16 switches and controls the corresponding one linear light emitting region 36 from the non-light emitting state to the light emitting state when the time “(Tf / N) + Tr” has elapsed.

前記判定結果が肯定となる場合には、垂直走査時間「Ｔｆ／Ｎ」で走査される液晶１９の走査領域において前半の走査領域、すなわち、走査開始となる最初の行に近い領域の書き替えが行われると考えられる。このため、液晶パネル１２には、前回のフレームと今回のフレームとで変化量が小さく、動きの少ない画像が表示されることとなる。したがって、光源制御部１６は、線状発光領域３６の発光タイミングを早めてオンデューティを大きくし、線状発光領域３６の発光時間を長くする。   When the determination result is affirmative, the first half of the scanning area of the liquid crystal 19 scanned with the vertical scanning time “Tf / N”, that is, the area close to the first row where scanning starts is rewritten. It is thought to be done. For this reason, the liquid crystal panel 12 displays an image with a small amount of change and little movement between the previous frame and the current frame. Accordingly, the light source control unit 16 increases the on-duty by increasing the light emission timing of the linear light emitting region 36 and lengthens the light emission time of the linear light emitting region 36.

一方、前記判定結果が否定となる場合は、垂直走査時間「Ｔｆ／Ｎ」で走査される液晶１９の走査領域において後半の走査領域、すなわち、走査終了となる最後の行に近い領域の書き替えが行われると考えられる。このため、液晶パネル１２には、前回のフレームと今回のフレームとで変化量が大きく、動きの多い画像が表示されることとなる。したがって、光源制御部１６は、線状発光領域３６の発光タイミングを変化量が小さい場合よりも遅らせてオンデューティを少なくし、線状発光領域３６の発光時間を前記変化量が小さい場合よりも短くする。   On the other hand, if the determination result is negative, rewriting of the second half of the scanning area of the liquid crystal 19 that is scanned with the vertical scanning time “Tf / N”, that is, the area close to the last row where scanning ends. Is considered to be performed. For this reason, the liquid crystal panel 12 displays an image with a large amount of change between the previous frame and the current frame and a large amount of movement. Therefore, the light source control unit 16 delays the light emission timing of the linear light emitting region 36 from the case where the change amount is small to reduce the on-duty, and the light emission time of the linear light emitting region 36 is shorter than the case where the change amount is small. To do.

したがって、本実施形態によれば、以下に示す効果を得ることができる。
（１）バックライト１４の発光領域を複数の線状発光領域３６に分割し、その線状発光領域３６毎に動画速度検出部１５の検出結果に応じて線状発光領域３６のオンデューティを調整するようにした。そして、光源制御部１６は、動画速度が遅い場合にはオンデューティを大きくして線状発光領域３６の発光期間を長くし、動画速度が早い場合にはオンデューティを小さくして、線状発光領域３６の発光期間を動画速度が遅い場合よりも短くする。このため、静止画像と動画像が混在して表示される場合であっても、分割された領域毎に発光デューティが調整されることにより、フリッカや動きぼけ（残像現象）を同時に抑制し、画質を向上させることができる。 Therefore, according to the present embodiment, the following effects can be obtained.
(1) The light emitting area of the backlight 14 is divided into a plurality of linear light emitting areas 36, and the on-duty of the linear light emitting areas 36 is adjusted for each of the linear light emitting areas 36 according to the detection result of the moving image speed detection unit 15. I tried to do it. The light source control unit 16 increases the on-duty when the moving image speed is slow to increase the light emission period of the linear light emitting region 36, and decreases the on-duty when the moving image speed is high to reduce the linear light emission. The light emission period of the region 36 is made shorter than when the moving image speed is slow. For this reason, even when still images and moving images are mixedly displayed, flicker and motion blur (afterimage phenomenon) are simultaneously suppressed by adjusting the light emission duty for each divided area, and image quality is improved. Can be improved.

（２）動画速度検出部１５は、前回のフレームと今回のフレームにおける各表示画像の変化量を差分で求め、動画速度を検出するようにした。このため、液晶表示装置１１の構成を簡素化できる。   (2) The moving image speed detection unit 15 obtains the change amount of each display image between the previous frame and the current frame as a difference, and detects the moving image speed. For this reason, the structure of the liquid crystal display device 11 can be simplified.

（３）動画速度検出部１５は、液晶パネル１２の垂直走査方向の動画速度を検出し、その動画速度に応じて光源制御部１６が線状発光領域３６の切替制御を行う。このため、液晶パネル１２の垂直走査方向に対する画像の動きに合わせて切替制御を行うことができる。   (3) The moving image speed detection unit 15 detects the moving image speed of the liquid crystal panel 12 in the vertical scanning direction, and the light source control unit 16 performs switching control of the linear light emitting region 36 according to the moving image speed. Therefore, switching control can be performed in accordance with the movement of the image in the vertical scanning direction of the liquid crystal panel 12.

（４）光源制御部１６は、線状発光領域３６毎に、該線状発光領域３６に対応する液晶１９の表示データの書き替えが完了した否かを判定する。そして、表示データの書き替えが液晶パネル１２の垂直走査時間の経過時までに完了するときには、最後に書き替えられる行までの垂直走査時間と当該最後に書き替えられる行と対応する液晶１９の応答時間の経過とともに線状発光領域３６を発光状態に切り替えて、オンデューティを大きくする。一方、表示データの書き替えが液晶１９の垂直走査時間の経過後に完了するときには、素直走査期間と液晶１９の応答時間（図４に示す時間（Ｔｆ／Ｎ）＋Ｔｒ）を待って線状発光領域３６を発光状態に切り替える。このため、書き替え完了の時期が垂直走査時間よりも前か後かによって線状発光領域３６を発光させるので、書き替え完了と同時に線状発光領域３６を発光させる場合に比して制御を簡素化することができる。   (4) The light source control unit 16 determines, for each linear light emitting area 36, whether or not rewriting of display data of the liquid crystal 19 corresponding to the linear light emitting area 36 is completed. When the rewriting of display data is completed before the vertical scanning time of the liquid crystal panel 12 elapses, the vertical scanning time until the last rewritten line and the response of the liquid crystal 19 corresponding to the last rewritten line are displayed. As the time elapses, the linear light emitting region 36 is switched to the light emitting state to increase the on-duty. On the other hand, when the rewriting of the display data is completed after the vertical scanning time of the liquid crystal 19 has elapsed, the linear light emitting region waits for the straight scanning period and the response time of the liquid crystal 19 (time (Tf / N) + Tr shown in FIG. 4). 36 is switched to the light emitting state. For this reason, since the linear light emitting region 36 emits light depending on whether the rewriting completion time is before or after the vertical scanning time, the control is simpler than when the linear light emitting region 36 emits light simultaneously with the completion of rewriting. Can be

（５）複数の線状発光領域３６を設け、それらの線状発光領域３６を１フレーム期間において順次発光状態と非発光状態とに切替制御しているので、全面発光する場合に比して消費電力を低減させることができる。   (5) Since a plurality of linear light emitting areas 36 are provided, and these linear light emitting areas 36 are sequentially controlled to be switched between a light emitting state and a non-light emitting state in one frame period, it is consumed as compared with the case where the entire surface emits light. Electric power can be reduced.

なお、上記実施形態は以下のように変更してもよい。
○ 光源制御部１６において、動画速度が遅い場合には図４に示す応答時間Ｔｒの経過後に線状発光領域３６を発光させ、その発光期間を長くしても良い。その逆に、動画速度が早い場合には図４に示す応答時間Ｔｒの経過後に線状発光領域３６を発光させ、その発光期間を短くしても良い。この場合、光源制御部１６は、動画速度検出部１５の差分結果をもとに、例えば、変化量が５０％を超えたときに動画速度が早いと判断し、超えないときに動画速度が遅いと判断しても良い。 In addition, you may change the said embodiment as follows.
In the light source controller 16, when the moving image speed is slow, the linear light emitting region 36 may emit light after the response time Tr shown in FIG. Conversely, when the moving image speed is high, the linear light emitting region 36 may emit light after the response time Tr shown in FIG. 4 has elapsed, and the light emitting period may be shortened. In this case, the light source control unit 16 determines that the moving image speed is fast, for example, when the change amount exceeds 50% based on the difference result of the moving image speed detection unit 15, and the moving image speed is slow when the change amount does not exceed it. You may judge.

○ バックライト１４の発光領域を構成する線状発光領域３６の数は変更しても良い。
○ バックライト１４は、ボトムエミッションタイプに限らず、基板と反対側から光を出射するトップエミッションタイプとしても良い。 The number of the linear light emitting areas 36 constituting the light emitting area of the backlight 14 may be changed.
The backlight 14 is not limited to the bottom emission type, and may be a top emission type that emits light from the side opposite to the substrate.

○ バックライト１４は、ＥＬ素子として、有機層３０に代えて無機ＥＬ層を使用した無機ＥＬ素子を備えた構成としても良い。   O The backlight 14 is good also as a structure provided with the inorganic EL element which replaced with the organic layer 30 and used the inorganic EL layer as an EL element.

本実施形態の液晶表示装置の主要構成を示すブロック図。1 is a block diagram showing a main configuration of a liquid crystal display device of an embodiment. 液晶パネルとバックライトを示す模式部分断面図。FIG. 3 is a schematic partial cross-sectional view showing a liquid crystal panel and a backlight. 線状発光領域を示す模式図。The schematic diagram which shows a linear light emission area | region. 線状発光領域の発光態様を説明する説明図。Explanatory drawing explaining the light emission aspect of a linear light emission area | region.

符号の説明Explanation of symbols

１１…液晶表示装置、１４…バックライト、１５…動画速度検出部、１６…光源制御部、１９…液晶、２８…ＥＬ素子としての有機ＥＬ素子、３６…線状発光領域。   DESCRIPTION OF SYMBOLS 11 ... Liquid crystal display device, 14 ... Back light, 15 ... Moving image speed detection part, 16 ... Light source control part, 19 ... Liquid crystal, 28 ... Organic EL element as EL element, 36 ... Linear light emission area | region.

Claims (4)

液晶パネルと、
前記液晶パネルの背面に設けられたＥＬ素子を備えるバックライトと、
前記液晶パネル及び前記バックライトを制御する制御部とを備える液晶表示装置において、
前記バックライトは、前記液晶パネルの垂直走査方向と直交する方向に延びる複数の線状発光領域から構成される面状の発光面を有しており、
前記制御部は、前記複数の線状発光領域を、前記液晶パネルの垂直走査に同期して順に発光状態と非発光状態とに切替制御し、
入力画像信号から表示画像の動画速度を検出する動画速度検出部とを備え、
前記制御部は、前記動画速度検出部の検出結果に応じて、前記線状発光領域毎に、前記動画速度が遅い場合には１フレームにおける前記線状発光領域の発光期間を長くし、前記動画速度が早い場合には前記線状発光領域の発光期間を前記動画速度が遅い場合よりも短くするように、前記バックライトを切替制御することを特徴とする液晶表示装置。 LCD panel,
A backlight including an EL element provided on the back surface of the liquid crystal panel;
In a liquid crystal display device comprising the liquid crystal panel and a control unit for controlling the backlight,
The backlight has a planar light emitting surface composed of a plurality of linear light emitting regions extending in a direction orthogonal to the vertical scanning direction of the liquid crystal panel,
The control unit controls the switching of the plurality of linear light emitting regions between a light emitting state and a non-light emitting state in order in synchronization with vertical scanning of the liquid crystal panel,
A moving image speed detecting unit that detects a moving image speed of the display image from the input image signal,
In accordance with the detection result of the moving image speed detecting unit, the control unit increases the light emitting period of the linear light emitting region in one frame when the moving image speed is slow for each linear light emitting region, The liquid crystal display device, wherein the backlight is switched and controlled so that the light emission period of the linear light emitting region is shorter when the speed is higher than when the moving image speed is slow. 前記動画速度検出部は、前回のフレームと今回のフレームにおける各表示画像の変化量を差分で求めることにより、前記動画速度を検出することを特徴とする請求項１に記載の液晶表示装置。 2. The liquid crystal display device according to claim 1, wherein the moving image speed detection unit detects the moving image speed by obtaining a difference in a change amount of each display image between a previous frame and a current frame. 前記動画速度検出部は、前記液晶パネルの垂直走査方向の動画速度を検出することを特徴とする請求項１又は請求項２に記載の液晶表示装置。 The liquid crystal display device according to claim 1, wherein the moving image speed detection unit detects a moving image speed in a vertical scanning direction of the liquid crystal panel. 前記制御部は、前記線状発光領域毎に、当該線状発光領域に対応する液晶の書き替えが完了した否かを判定し、この判定結果が肯定の場合であって前記書き替えが前記液晶パネルの垂直走査時間の経過時までに完了するときには前記線状発光領域の発光期間を長くし、前記書き替えが前記垂直走査時間の経過後に完了するときには前記線状発光領域の発光期間を短くするように前記バックライトを切替制御することを特徴とする請求項１〜請求項３のうちいずれか一項に記載の液晶表示装置。 The control unit determines, for each linear light emitting area, whether or not rewriting of the liquid crystal corresponding to the linear light emitting area is completed, and when the determination result is affirmative, the rewriting is performed on the liquid crystal When completed by the elapse of the vertical scanning time of the panel, the light emitting period of the linear light emitting region is lengthened, and when the rewriting is completed after the elapse of the vertical scanning time, the light emitting period of the linear light emitting region is shortened. The liquid crystal display device according to any one of claims 1 to 3, wherein the backlight is controlled to be switched as described above.
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