JP2006323299A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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JP2006323299A
JP2006323299A JP2005148506A JP2005148506A JP2006323299A JP 2006323299 A JP2006323299 A JP 2006323299A JP 2005148506 A JP2005148506 A JP 2005148506A JP 2005148506 A JP2005148506 A JP 2005148506A JP 2006323299 A JP2006323299 A JP 2006323299A
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light emitting
liquid crystal
linear light
emitting region
organic
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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 JP2005148506A priority Critical patent/JP2006323299A/en
Priority to PCT/JP2006/309842 priority patent/WO2006123705A1/en
Priority to TW095117653A priority patent/TW200701153A/en
Publication of JP2006323299A publication Critical patent/JP2006323299A/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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the lifetime of an organic EL element is prolonged, even when the light-emitting region of a lighting device is constituted of the organic EL element. <P>SOLUTION: The luminance of a linear light-emitting region is gradually raised by starting switch and control of the linear light-emitting region constituting the light-emitting region of the lighting device, which is simultaneous with the start (time ts1) of data rewriting of a liquid crystal. In this case, the luminance is controlled by a light source control part so as to reach a predetermined luminance value, later than a time point (time t1) of the completion of liquid crystal response and before the time (time t2) of switching of lighting of the linear light-emitting region. Thus, the lifetime of the organic EL element is prolonged by the control, because no sudden current supply is no longer conducted on the switching of lighting. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、面状の発光領域が有機ＥＬ素子で構成された照明装置をバックライトとして用いた液晶表示装置に関する。   The present invention relates to a liquid crystal display device using a lighting device in which a planar light emitting region is composed of organic EL elements as a backlight.

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知られている。この液晶表示装置は、バックライトを有し、該バックライトを構成する面発光素子をオン／オフ駆動させることにより、画像を形成する液晶パネルに背面から表示光が与えられるようになっている（特許文献１参照）。   Liquid crystal display devices are widely known as display devices for computers, portable devices, and the like. This liquid crystal display device has a backlight, and by turning on / off the surface light emitting elements constituting the backlight, display light is applied to the liquid crystal panel forming the image from the back surface ( Patent Document 1).

ところで、近年、液晶表示装置には、静止画像だけでなく動画像の表示もなされている。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。そこで、近年では、バックライトの発光領域を複数の線状発光領域に分割形成し、該線状発光領域を順に点灯させる擬似インパルス駆動方式でバックライトを駆動させることが考えられている。
特開２００２−２２９０２１号公報 Incidentally, in recent years, not only still images but also moving images are displayed on the liquid crystal display devices. 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. Therefore, in recent years, it has been considered to divide and form the backlight emission region into a plurality of linear light emission regions, and drive the backlight by a pseudo impulse driving method in which the linear light emission regions are sequentially turned on.
JP 2002-229021 A

しかしながら、擬似インパルス駆動方式では、バックライトを構成する複数の線状発光領域が発光（点灯）と非発光（消灯）を頻繁に繰り返すこととなる。このため、バックライトの発光領域を有機ＥＬ素子で構成した場合には、点灯毎に有機ＥＬ素子に対して電流供給がなされ、その電流供給が繰り返される。したがって、有機ＥＬ素子の寿命が短くなる虞があった。   However, in the pseudo impulse driving method, the plurality of linear light emitting regions constituting the backlight frequently repeat light emission (lighting) and non-light emission (lighting off). For this reason, when the light emission region of the backlight is configured by an organic EL element, a current is supplied to the organic EL element every time it is turned on, and the current supply is repeated. Therefore, the life of the organic EL element may be shortened.

この発明は、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、照明装置の発光領域を有機ＥＬ素子で構成した場合であっても、該有機ＥＬ素子の寿命を延ばす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 achieve the organic EL even when the light emitting region of the lighting device is composed of organic EL elements. An object of the present invention is to provide a liquid crystal display device capable of extending the lifetime of the element.

本発明の液晶表示装置は、有機ＥＬ素子で構成された面状の発光領域を備え、前記面状の発光領域は液晶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で構成された照明装置をバックライトとして用いた液晶表示装置において、液晶の駆動データを書き替える液晶駆動部と、前記複数の線状発光領域を、前記液晶の垂直走査に同期して順に発光するように発光状態と非発光状態とに切替制御する制御部とを備え、前記制御部は、前記線状発光領域を発光状態に切替制御する場合、前記駆動データの書き替え対象となった前記液晶に対応する線状発光領域の輝度を時間の経過とともに上昇させ、当該輝度を前記液晶の応答が完了する時点よりも遅く、かつ前記複数の線状発光領域の何れかが発光状態又は非発光状態に切り替わる点灯切替時点までの間に予め定めた設定輝度に到達させる。   The liquid crystal display device of the present invention includes a planar light emitting region composed of organic EL elements, and the planar light emitting region is composed of a plurality of linear light emitting regions extending in a direction perpendicular to the vertical scanning direction of the liquid crystal. In the liquid crystal display device using the illuminating device as a backlight, the liquid crystal driving unit for rewriting the driving data of the liquid crystal and the plurality of linear light emitting regions emit light in order to emit light in order in synchronization with the vertical scanning of the liquid crystal A control unit that controls switching between a light emitting state and a non-light emitting state, and the control unit corresponds to the liquid crystal that is the target of rewriting the drive data when the linear light emitting region is switched to the light emitting state. The brightness of the linear light emitting area is increased with time, the brightness is slower than the time when the response of the liquid crystal is completed, and any of the plurality of linear light emitting areas is switched to a light emitting state or a non-light emitting state. To reach the predetermined set brightness until switching point.

これによれば、駆動データの書き替え対象となった液晶に対応する線状発光領域は、発光状態に切替制御される際にその輝度が徐々に上昇するように制御され、設定輝度に到達することによって発光状態に切り替えられる。このため、面状の発光領域が複数の線状発光領域に分割され、その線状発光領域が順に発光するように切替制御される場合であっても（擬似インパルス駆動）、有機ＥＬ素子の寿命を延ばすことが可能となる。すなわち、有機ＥＬ素子に対する電流供給が点灯切替時に急激に行われないので、擬似インパルス駆動方式で照明装置を駆動させても該照明装置を構成する有機ＥＬ素子の寿命を延ばすことが可能である。   According to this, the linear light emitting area corresponding to the liquid crystal to be rewritten with the drive data is controlled so that the luminance gradually increases when switching to the light emitting state is reached, and reaches the set luminance. Thus, the light emission state is switched. For this reason, even when the planar light-emitting region is divided into a plurality of linear light-emitting regions and the linear light-emitting regions are controlled so as to emit light in order (pseudo impulse driving), the lifetime of the organic EL element Can be extended. That is, since the current supply to the organic EL element is not suddenly performed at the time of lighting switching, it is possible to extend the life of the organic EL element constituting the lighting apparatus even if the lighting apparatus is driven by the pseudo impulse driving method.

また、前記制御部は、前記液晶の駆動データの書き替え開始と同時に前記線状発光領域の切替制御を開始させても良い。
また、前記制御部は、前記線状発光領域の非発光状態において前記有機ＥＬ素子に逆バイアス電圧を印加させても良い。 The control unit may start switching control of the linear light emitting region simultaneously with the start of rewriting of driving data of the liquid crystal.
Further, the control unit may apply a reverse bias voltage to the organic EL element in a non-light emitting state of the linear light emitting region.

また、前記制御部は、前記発光状態に切替制御した線状発光領域を、次フレームにおける前記駆動データの書き替え開始の直前に前記非発光状態へ切替制御しても良い。   In addition, the control unit may perform switching control of the linear light emitting region that is controlled to be switched to the light emitting state to the non-light emitting state immediately before the start of rewriting the driving data in the next frame.

本発明によれば、照明装置の発光領域を有機ＥＬ素子で構成した場合であっても、該有機ＥＬ素子の寿命を延ばすことができる。   ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the light emission area | region of an illuminating device is comprised with an organic EL element, the lifetime of this organic EL element can be extended.

（第１の実施形態）
以下、本発明を具体化した第１の実施形態を図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、照明装置１４と、該照明装置１４を制御する制御部Ｓを構成する光源制御部１５と電流コントローラ１６とを備えている。 (First embodiment)
Hereinafter, a first embodiment of 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 driving unit 13 that controls the liquid crystal panel 12, an illumination device 14, and a light source control unit 15 that constitutes a control unit S that controls the illumination device 14. And a current controller 16.

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。照明装置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 illumination device 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.

照明装置１４は、液晶パネル１２の背面（表示面と反対側の面）側にバックライトとして配置される。本実施形態の照明装置１４は、面状の発光領域が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、照明装置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 illumination device 14 is disposed as a backlight on the back surface (surface opposite to the display surface) of the liquid crystal panel 12. As for the illuminating device 14 of this embodiment, the planar light emission area | region is comprised with the EL (electroluminescence) element. As shown in FIG. 2, the lighting device 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、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 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領域となる。そして、有機ＥＬ素子２８の発光領域は、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の発光領域が６つの線状発光領域３６に分割されている。なお、図３は、照明装置１４の発光領域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 region. The light emitting area of the organic EL element 28 is composed of a plurality of linear light emitting areas 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 region of the organic EL element 28 is divided into six linear light emitting regions 36. FIG. 3 schematically shows a light emitting region of the illumination device 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、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、複数列分の画素領域を照明するのに必要な幅で形成されている。本実施形態において各線状発光領域３６は、液晶パネル１２の液晶１９の行（走査ライン）と対応付けられており、各線状発光領域３６に対応する液晶１９の行数（走査ライン数）が同一数となるように等分割されている。すなわち、６つの線状発光領域３６は、その発光面積が等しくなるように等分割されている。   As shown in FIG. 2, the width of the linear light emitting region 36 is not the total width of one pixel, that is, the three regions 23a, 23b, 23c, but the total width of the regions 23a, 23b, 23c for a plurality of pixels. Is formed. That is, the linear light emitting region 36 is formed with a width necessary to illuminate a plurality of columns of pixel regions. In the present embodiment, each linear light emitting region 36 is associated with a row (scanning line) of the liquid crystal 19 of the liquid crystal panel 12, and the number of rows (scanning line) of the liquid crystal 19 corresponding to each linear light emitting region 36 is the same. It is divided equally so that it becomes a number. That is, the six linear light emitting regions 36 are equally divided so that their light emitting areas are equal.

有機ＥＬ素子２８は、電気的にはダイオード成分と、そのダイオード成分と並列に接続された寄生容量成分とによる構成として置き換えることができると考えられている。そして、有機ＥＬ素子２８は、駆動電圧が印加されると、先ず、当該有機ＥＬ素子２８の電気容量に相当する電荷が累積される。続いて、有機ＥＬ素子２８は、素子固有の一定の電圧（発光閾値）に達すると、ダイオード成分の陽極側から発光層を構成する有機層３０に電流が流れ始め、この電流に比例した強度（輝度）で発光すると考えられている。   It is considered that the organic EL element 28 can be electrically replaced with a configuration of a diode component and a parasitic capacitance component connected in parallel with the diode component. When a driving voltage is applied to the organic EL element 28, first, charges corresponding to the electric capacity of the organic EL element 28 are accumulated. Subsequently, when the organic EL element 28 reaches a constant voltage (light emission threshold) unique to the element, a current starts to flow from the anode side of the diode component to the organic layer 30 constituting the light emitting layer, and the intensity ( Brightness).

光源制御部１５は、照明装置１４を構成する複数の線状発光領域３６を、液晶パネル１２（液晶１９）の垂直走査（走査信号の出力）に同期して順に発光するように発光状態と非発光状態に切替制御する（擬似インパルス駆動）。本実施形態において光源制御部１５は、６つの線状発光領域３６の切替制御を１フレーム周期で行う。１フレームとは、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。光源制御部１５により切替制御される各線状発光領域３６は、１フレームの１／６の長さ間隔で順に発光状態（点灯状態）となる。なお、各線状発光領域３６は、発光状態になると、予め定めた発光時間（一定時間）の間、発光状態を継続し、その発光時間の経過後に非発光状態となり、予め定めた非発光時間（一定時間）の間、非発光状態を継続する。本実施形態において発光時間は、線状発光領域３６が予め定めた設定輝度Ｋ（照明装置１４をバックライトとして機能させるために必要な輝度）で発光を開始してからの時間である。   The light source control unit 15 sets the light emitting state and non-light emission so that the plurality of linear light emitting regions 36 constituting the illumination device 14 emit light sequentially in synchronization with vertical scanning (output of scanning signals) of the liquid crystal panel 12 (liquid crystal 19). Switch control to the light emission state (pseudo impulse drive). In the present embodiment, the light source control unit 15 performs switching control of the six linear light emitting areas 36 in one frame cycle. One frame is a period during which all the pixels constituting one screen of the liquid crystal panel 12 are scanned. Each linear light emitting region 36 that is controlled to be switched by the light source control unit 15 is sequentially in a light emitting state (lighted state) at a length interval of 1/6 of one frame. In addition, when each linear light emission area | region 36 will be in a light emission state, it will continue a light emission state for predetermined light emission time (a fixed time), will be in a non-light emission state after progress of the light emission time, and will be predetermined light emission time ( For a certain period of time). In the present embodiment, the light emission time is a time after the linear light emitting region 36 starts light emission at a predetermined set luminance K (a luminance necessary for the lighting device 14 to function as a backlight).

そして、光源制御部１５は、同期信号を入力し、液晶１９のデータ書き替え開始（最初の行の書き替え開始）と同時に、該液晶１９に対応する線状発光領域３６の切替制御を開始する。切替制御を開始した光源制御部１５は、有機ＥＬ素子２８に駆動電圧を印加する。また、光源制御部１５は、線状発光領域３６を発光状態に切り替えると、発光状態の開始から発光時間の経過時に、該線状発光領域３６を非発光状態に切替制御する。   Then, the light source control unit 15 receives the synchronization signal, and starts switching control of the linear light emitting region 36 corresponding to the liquid crystal 19 simultaneously with the start of data rewriting of the liquid crystal 19 (start of rewriting of the first row). . The light source control unit 15 that has started the switching control applies a driving voltage to the organic EL element 28. In addition, when the light source control unit 15 switches the linear light emitting region 36 to the light emitting state, the light source control unit 15 switches the linear light emitting region 36 to the non-light emitting state when the light emission time has elapsed from the start of the light emitting state.

電流コントローラ１６は、光源制御部１５の印加した駆動電圧を線状発光領域３６の輝度が予め定めた輝度上昇パターン（図４参照）にしたがって上昇するように変換し、有機ＥＬ素子２８（有機層３０）に流れる電流量を制御する。本実施形態において電流コントローラ１６は、線状発光領域３６の輝度が時間の経過とともに徐々に上昇するように電流量を制御する。   The current controller 16 converts the drive voltage applied by the light source control unit 15 so that the luminance of the linear light emitting region 36 increases according to a predetermined luminance increase pattern (see FIG. 4), and the organic EL element 28 (organic layer) 30) is controlled. In the present embodiment, the current controller 16 controls the amount of current so that the luminance of the linear light emitting region 36 gradually increases with time.

図４は、本実施形態における液晶１９の応答時間と有機ＥＬ素子２８の輝度との関係を示すタイムチャートである。
液晶１９は、液晶駆動部１３により駆動データの書き替え（データ書き替え）が行われる。図４に示す時間ｔｓ１は、液晶１９へのデータ書き替えの開始時点であり、時間ｔ１は、データ書き替えの開始から最後の行へのデータ書き替えが終了し、液晶１９の応答が完了した時点である。液晶１９の応答が完了するとは、液晶１９が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）が変化することである。なお、液晶１９の応答が完了した時点とは、一般的に液晶１９の応答が９０％以上完了した時点を意味する。 FIG. 4 is a time chart showing the relationship between the response time of the liquid crystal 19 and the luminance of the organic EL element 28 in the present embodiment.
In the liquid crystal 19, the driving data is rewritten (data rewriting) by the liquid crystal driving unit 13. The time ts1 shown in FIG. 4 is the start time of data rewriting to the liquid crystal 19, and the time t1 is the time when the data rewriting from the start of data rewriting to the last line is completed and the response of the liquid crystal 19 is completed. It is time. When the response of the liquid crystal 19 is completed, the alignment (orientation) changes between a state in which the liquid crystal 19 transmits light (transmission state) and a state in which light transmission is blocked (non-transmission state). The time when the response of the liquid crystal 19 is completed generally means a time when the response of the liquid crystal 19 is completed by 90% or more.

一方、光源制御部１５は、液晶１９へのデータ書き替えが開始する時間ｔｓ１で線状発光領域３６の切替制御を開始する。また、電流コントローラ１６は、線状発光領域３６の輝度が図４の下段に示す特性となるように輝度上昇パターンにしたがって電流量を制御する。本実施形態の輝度上昇パターンは、線状発光領域３６の輝度が緩やかなカーブを描くように（曲線的）に徐々に上昇し、時間ｔ２の経過時に線状発光領域３６の輝度が設定輝度Ｋへ到達するように定められている。時間ｔ２は、液晶１９の応答が完了する時間ｔ１から所定時間遅れた時間に設定されている。また、時間ｔ２は、擬似インパルス駆動における線状発光領域３６の点灯切替時（液晶１９の応答が完了する時間ｔ１から直近（最も時間的に近い）の点灯切替時）と一致するように設定されている。点灯切替時は、他の線状発光領域３６が発光状態から非発光状態に切り替わるタイミング、又は線状発光領域３６が非発光状態から発光状態に切り替わるタイミングである。   On the other hand, the light source control unit 15 starts switching control of the linear light emitting region 36 at time ts1 when data rewriting to the liquid crystal 19 starts. Further, the current controller 16 controls the amount of current according to the luminance increase pattern so that the luminance of the linear light emitting region 36 has the characteristics shown in the lower part of FIG. The luminance increasing pattern of the present embodiment gradually increases so that the luminance of the linear light emitting region 36 draws a gentle curve (curved), and the luminance of the linear light emitting region 36 becomes the set luminance K when time t2 has elapsed. It is stipulated to reach The time t2 is set to a time delayed by a predetermined time from the time t1 when the response of the liquid crystal 19 is completed. The time t2 is set to coincide with the lighting switching of the linear light emitting region 36 in the pseudo impulse driving (the lighting switching closest to the time (closest in time) from the time t1 when the response of the liquid crystal 19 is completed). ing. When the lighting is switched, it is a timing at which another linear light emitting area 36 switches from the light emitting state to the non-light emitting state, or a timing at which the linear light emitting area 36 switches from the non light emitting state to the light emitting state.

なお、有機ＥＬ素子２８は、前述したように素子固有の一定の電圧（発光閾値）に達すると、ダイオード成分の陽極側から発光層を構成する有機層３０に電流が流れ始める。そして、線状発光領域３６は、有機ＥＬ素子２８に駆動電圧を印加した直後の輝度が「０（零）」となり、一定の電圧に達すると電流が流れ始めて輝度が上昇していく。このため、本実施形態では、液晶１９へのデータ書き替えの開始タイミングと線状発光領域３６の切替制御の開始タイミングは一致するが、線状発光領域３６が発光するタイミングは若干遅延する。   As described above, when the organic EL element 28 reaches a certain voltage (light emission threshold) unique to the element, a current starts to flow from the anode side of the diode component to the organic layer 30 constituting the light emitting layer. In the linear light emitting region 36, the luminance immediately after the drive voltage is applied to the organic EL element 28 becomes “0 (zero)”, and when the voltage reaches a certain voltage, the current starts to flow and the luminance increases. For this reason, in this embodiment, the start timing of data rewriting to the liquid crystal 19 coincides with the start timing of the switching control of the linear light emitting area 36, but the timing at which the linear light emitting area 36 emits light is slightly delayed.

光源制御部１５により切替制御された線状発光領域３６は、時間ｔ２の経過時にその輝度が設定輝度Ｋに到達し、発光状態となる。そして、光源制御部１５は、時間ｔ３の経過時まで線状発光領域３６を発光状態に維持し（時間ｔ２〜時間ｔ３の間）、時間ｔ３の経過時に線状発光領域３６を発光状態から非発光状態に切替制御する。時間ｔ３の経過時に非発光状態となった線状発光領域３６は、次フレームにて液晶１９へのデータ書き替えが開始する迄の間、非発光状態を維持する（時間ｔ３〜次フレームの時間ｔｓ２の間）。制御部Ｓ（光源制御部１５と電流コントローラ１６）は、各フレームにおいて前述のように線状発光領域３６を制御する。   The luminance of the linear light emitting area 36 that is switched and controlled by the light source control unit 15 reaches the set luminance K when the time t2 has elapsed, and enters a light emitting state. Then, the light source control unit 15 maintains the linear light emitting region 36 in the light emitting state until the time t3 has elapsed (between time t2 and time t3), and when the time t3 has elapsed, the linear light emitting region 36 is removed from the light emitting state. Switch control to light emission state. The linear light emitting region 36 that has become non-light emitting after the elapse of time t3 maintains the non light emitting state until data rewriting to the liquid crystal 19 is started in the next frame (time t3 to time of the next frame). during ts2). The control unit S (the light source control unit 15 and the current controller 16) controls the linear light emitting region 36 in each frame as described above.

本実施形態の液晶表示装置１１では、液晶１９へのデータ書き替えの開始と同時に線状発光領域３６の切替制御（非発光状態から発光状態への切り替え）も開始される。そして、線状発光領域３６の輝度は、液晶１９へのデータ書き替えが進行する毎に上昇し、液晶１９の応答完了後に設定輝度に到達する。線状発光領域３６の輝度が図４に示すように徐々に上昇する場合、有機ＥＬ素子２８に流れる電流量は、線状発光領域３６の輝度上昇に対応して徐々に増加されることになる。   In the liquid crystal display device 11 of the present embodiment, the switching control of the linear light emitting region 36 (switching from the non-light emitting state to the light emitting state) is started simultaneously with the start of data rewriting to the liquid crystal 19. Then, the luminance of the linear light emitting region 36 increases every time data rewriting to the liquid crystal 19 proceeds, and reaches the set luminance after the response of the liquid crystal 19 is completed. When the luminance of the linear light emitting region 36 gradually increases as shown in FIG. 4, the amount of current flowing through the organic EL element 28 is gradually increased corresponding to the increase in luminance of the linear light emitting region 36. .

したがって、本実施形態によれば、以下に示す効果（１）〜（３）を得ることができる。
（１）線状発光領域３６を発光状態に切替制御する場合、制御部Ｓにより、当該線状発光領域３６の輝度を徐々に上昇させるようにした。このため、照明装置１４の発光領域が複数の線状発光領域３６に分割され、その線状発光領域３６を順に発光させるように切替制御する場合であっても、有機ＥＬ素子２８の寿命を延ばすことができる。すなわち、有機ＥＬ素子２８に対する電流供給が点灯切替時（図４に示す時間ｔ２）に急激に行われないので、線状発光領域３６が頻繁に発光（点灯）／非発光（消灯）を繰り返す擬似インパルス駆動方式で照明装置１４を駆動させても、有機ＥＬ素子２８の寿命を延ばすことができる。 Therefore, according to the present embodiment, the following effects (1) to (3) can be obtained.
(1) When switching the linear light emitting region 36 to the light emitting state, the brightness of the linear light emitting region 36 is gradually increased by the control unit S. For this reason, even if it is a case where the light emission area | region of the illuminating device 14 is divided | segmented into the some linear light emission area | region 36, and switching control is performed so that the linear light emission area | region 36 light-emits sequentially, the lifetime of the organic EL element 28 is extended. be able to. That is, since the current supply to the organic EL element 28 is not suddenly performed at the time of lighting switching (time t2 shown in FIG. 4), the linear light emitting region 36 frequently repeats light emission (lighting) / non-light emission (lighting off). Even if the illuminating device 14 is driven by the impulse driving method, the lifetime of the organic EL element 28 can be extended.

（２）また、線状発光領域３６の輝度を徐々に上昇させることにより、当該線状発光領域３６は、その点灯切替時（図４に示す時間ｔ２）に達する前にある程度の輝度で発光していることになる。したがって、照明装置１４の平均輝度を上げることができる。また、平均輝度が同じ場合は、ピーク輝度が低くなる。   (2) Further, by gradually increasing the luminance of the linear light emitting region 36, the linear light emitting region 36 emits light with a certain luminance before reaching the lighting switching time (time t2 shown in FIG. 4). Will be. Therefore, the average brightness of the lighting device 14 can be increased. In addition, when the average luminance is the same, the peak luminance is low.

（３）光源制御部１５は、液晶駆動部１３による液晶１９のデータ書き替え開始と同時に線状発光領域３６の切替制御を開始する。このため、光源制御部１５は、同期信号を入力し、液晶１９のデータ書き替え開始タイミングを把握するだけ、線状発光領域３６の切替制御を開始させることができる。したがって、線状発光領域３６の切替制御の開始タイミングをタイマなどの計時手段を用いて計る必要がなく、制御を簡素化することができる。   (3) The light source control unit 15 starts switching control of the linear light emitting region 36 simultaneously with the start of data rewriting of the liquid crystal 19 by the liquid crystal driving unit 13. For this reason, the light source control unit 15 can start the switching control of the linear light emitting region 36 only by inputting the synchronization signal and grasping the data rewrite start timing of the liquid crystal 19. Therefore, it is not necessary to measure the start timing of the switching control of the linear light emitting region 36 using a timer such as a timer, and the control can be simplified.

（第２の実施形態）
次に、本発明を具体化した第２の実施形態を図５にしたがって説明する。なお、以下に説明する実施形態において、既に説明した実施形態と同一構成については同一符号を付すなどして、その重複する説明を省略又は簡略する。 (Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that, in the embodiments described below, the same components as those in the embodiments described above are denoted by the same reference numerals, and redundant descriptions thereof are omitted or simplified.

有機ＥＬ素子２８は、電気的にはダイオード成分と、ダイオード成分と並列に接続された寄生容量成分とによる構成として置き換えることができると考えられている。そして、有機ＥＬ素子２８は、ダイオード成分の順方向電流にほぼ比例した強度で発光することが知られている。また、有機ＥＬ素子２８においては、発光に関与しない逆方向の電圧（逆バイアス電圧）を印加することで、有機ＥＬ素子２８の寿命を延ばすことができることが経験的に知られている。   It is considered that the organic EL element 28 can be electrically replaced with a configuration of a diode component and a parasitic capacitance component connected in parallel with the diode component. The organic EL element 28 is known to emit light with an intensity substantially proportional to the forward current of the diode component. In addition, it is empirically known that the organic EL element 28 can extend the life of the organic EL element 28 by applying a reverse voltage (reverse bias voltage) that does not contribute to light emission.

このため、本実施形態では、液晶表示装置１１が擬似インパルス駆動される際、有機ＥＬ素子２８に電圧を印加させない（印加電圧をグランドレベル（０Ｖ））に保持する）非発光状態において、有機ＥＬ素子２８に逆バイアス電圧が印加されるようになっている。すなわち、光源制御部１５は、図５に示すように、発光状態においては所定の駆動電圧Ｖｆを有機ＥＬ素子２８に印加し、非発光状態においては逆バイアス電圧−Ｖｆを印加する。   For this reason, in the present embodiment, when the liquid crystal display device 11 is driven by pseudo impulse driving, the organic EL element 28 is not applied with a voltage (the applied voltage is held at the ground level (0 V)) and is not light-emitting. A reverse bias voltage is applied to the element 28. That is, as shown in FIG. 5, the light source control unit 15 applies a predetermined drive voltage Vf to the organic EL element 28 in the light emitting state and applies a reverse bias voltage −Vf in the non-light emitting state.

したがって、本実施形態によれば、第１の実施形態の効果（１）〜（３）に加えて以下に示す効果を得ることができる。
（４）液晶表示装置１１が擬似インパルス駆動される場合、有機ＥＬ素子２８は、発光状態と非発光状態を繰り返す。このため、擬似インパルス駆動において有機ＥＬ素子２８が非発光状態となる期間を利用して逆バイアス電圧を印加することで、照明装置１４の輝度を低下させることなく（又は照明装置１４の発光時間を低下させることなく）、逆バイアス電圧を印加させることができる。そして、逆バイアス電圧の印加により、有機ＥＬ素子２８の寿命を延ばすことができる。 Therefore, according to this embodiment, in addition to the effects (1) to (3) of the first embodiment, the following effects can be obtained.
(4) When the liquid crystal display device 11 is pseudo-impulse driven, the organic EL element 28 repeats a light emitting state and a non-light emitting state. Therefore, by applying a reverse bias voltage using a period in which the organic EL element 28 is in a non-light emitting state in pseudo impulse driving, the luminance of the lighting device 14 is not reduced (or the light emission time of the lighting device 14 is reduced). A reverse bias voltage can be applied without reduction. And the lifetime of the organic EL element 28 can be extended by application of a reverse bias voltage.

（第３の実施形態）
次に、本発明を具体化した第３の実施形態を図６にしたがって説明する。
本実施形態では、線状発光領域３６を発光状態から非発光状態に切替制御するタイミングが異なっている。本実施形態の液晶表示装置１１では、図６に示すように、発光状態に切替制御された線状発光領域３６が、次フレームにて液晶１９のデータ書き換えが開始する時点（時間ｔｓ２）の直前で非発光状態に切替制御されるようになっている。このため、発光状態とされた線状発光領域３６は、次フレームにおいて液晶１９のデータ書き替えが開始する直前まで発光状態を維持する。 (Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
In the present embodiment, the timing for switching and controlling the linear light emitting region 36 from the light emitting state to the non-light emitting state is different. In the liquid crystal display device 11 of the present embodiment, as shown in FIG. 6, the linear light emitting area 36 that is controlled to be switched to the light emitting state immediately before the time when data rewriting of the liquid crystal 19 is started in the next frame (time ts2). Is switched to the non-light emitting state. For this reason, the linear light emitting region 36 in the light emitting state maintains the light emitting state until immediately before the data rewriting of the liquid crystal 19 is started in the next frame.

したがって、本実施形態によれば、第１の実施形態の効果（１）〜（３）に加えて以下に示す効果を得ることができる。
（５）線状発光領域３６の発光期間が長くなるので、発光デューティを最大にすることができる。発光デューティは、１フレームにおいて線状発光領域３６が発光する割合を意味する。線状発光領域３６の発光デューティが最大になると、照明装置１４として同じ輝度において、各線状発光領域３６のピーク電流値が最小になり、有機ＥＬ素子２８の寿命を延ばすことができる。また、同じ電力消費量であれば、電力効率が良くなって照明装置１４の輝度が向上する。 Therefore, according to this embodiment, in addition to the effects (1) to (3) of the first embodiment, the following effects can be obtained.
(5) Since the light emission period of the linear light emitting region 36 becomes longer, the light emission duty can be maximized. The light emission duty means the rate at which the linear light emitting region 36 emits light in one frame. When the light emission duty of the linear light emitting region 36 is maximized, the peak current value of each linear light emitting region 36 is minimized at the same luminance as the illumination device 14, and the life of the organic EL element 28 can be extended. Moreover, if it is the same power consumption, power efficiency will improve and the brightness | luminance of the illuminating device 14 will improve.

なお、本実施形態は以下のように変更してもよい。
○ 線状発光領域３６の輝度を上昇させる輝度上昇パターン（上昇の傾き）を変更しても良い。図７には、他の輝度上昇パターンを例示している。図７（ａ）は、実施形態で説明した輝度上昇パターンと曲線の向きが異なるパターンである。図７（ｂ）は、直線的に輝度を上昇させるパターンである。図７（ｃ）は、液晶１９のデータ書き替えが開始する時点（時間ｔｓ）に対して線状発光領域３６の切替制御を開始する時点（時点ｔｓａ）を遅らせ、時間ｔ２で設定輝度に到達するパターンである。また、図示しないが、線状発光領域３６の輝度をステップ状に上昇させても良い。線状発光領域３６の切替制御の開始時点は、液晶１９のデータ書き替えが開始する時点と同一時点から時点ｔ２と一致しない時点までの範囲で設定する。 In addition, you may change this embodiment as follows.
O The luminance increase pattern (inclination of increase) for increasing the luminance of the linear light emitting region 36 may be changed. FIG. 7 illustrates another luminance increase pattern. FIG. 7A is a pattern in which the direction of the curve is different from the luminance increase pattern described in the embodiment. FIG. 7B shows a pattern for linearly increasing the luminance. FIG. 7C delays the time point (time tsa) at which the switching control of the linear light emitting region 36 is started with respect to the time point when data rewriting of the liquid crystal 19 is started (time ts), and reaches the set luminance at time t2. Pattern. Although not shown, the luminance of the linear light emitting region 36 may be increased stepwise. The start point of the switching control of the linear light emitting region 36 is set in a range from the same time point when the data rewriting of the liquid crystal 19 starts to the time point not coincident with the time point t2.

○ 照明装置１４の発光領域を構成する線状発光領域３６の数（分割数）を変更しても良い。
○ 照明装置１４の発光領域を構成する線状発光領域３６は等分割に限らず、線状発光領域３６毎に対応する液晶１９の行数が異なるように分割しても良い。 (Circle) You may change the number (division | segmentation number) of the linear light emission area | region 36 which comprises the light emission area | region of the illuminating device 14. FIG.
The linear light emitting area 36 constituting the light emitting area of the illumination device 14 is not limited to being equally divided, and may be divided so that the number of rows of the liquid crystal 19 corresponding to each linear light emitting area 36 is different.

○ 逆バイアス電圧は、線状発光領域３６の非発光状態において、全期間印加しても良いし、一部の期間印加しても良い。
○ 照明装置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 reverse bias voltage may be applied for the entire period or in a part of the period in the non-light emitting state of the linear light emitting region 36.
The illumination device 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.

液晶表示装置の主要構成を示すブロック図。FIG. 2 is a block diagram illustrating a main configuration of a liquid crystal display device. 液晶パネルと照明装置を示す模式部分断面図。The schematic fragmentary sectional view which shows a liquid crystal panel and an illuminating device. 線状発光領域を示す模式図。The schematic diagram which shows a linear light emission area | region. 第１の実施形態における液晶の応答時間と有機ＥＬ素子の輝度との関係を示すタイムチャート。The time chart which shows the relationship between the response time of the liquid crystal in 1st Embodiment, and the brightness | luminance of an organic EL element. 第２の実施形態における有機ＥＬ素子への印加電圧の波形を示すグラフ。The graph which shows the waveform of the voltage applied to the organic EL element in 2nd Embodiment. 第３の実施形態における有機ＥＬ素子の輝度を示すタイムチャート。The time chart which shows the brightness | luminance of the organic EL element in 3rd Embodiment. （ａ）〜（ｃ）は、別例における有機ＥＬ素子の輝度を示すタイミングチャート。(A)-(c) is a timing chart which shows the brightness | luminance of the organic EL element in another example.

符号の説明Explanation of symbols

１１…液晶表示装置、１３…液晶駆動部、１４…照明装置、１５…光源制御部、１６…電流コントローラ、１９…液晶、２８…有機ＥＬ素子、３６…線状発光領域、Ｋ…設定輝度、Ｓ…制御部。   DESCRIPTION OF SYMBOLS 11 ... Liquid crystal display device, 13 ... Liquid crystal drive part, 14 ... Illumination device, 15 ... Light source control part, 16 ... Current controller, 19 ... Liquid crystal, 28 ... Organic EL element, 36 ... Linear light emission area | region, K ... Setting brightness | luminance, S: Control unit.

Claims (4)

有機ＥＬ素子で構成された面状の発光領域を備え、前記面状の発光領域は液晶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で構成された照明装置をバックライトとして用いた液晶表示装置において、
液晶の駆動データを書き替える液晶駆動部と、
前記複数の線状発光領域を、前記液晶の垂直走査に同期して順に発光するように発光状態と非発光状態とに切替制御する制御部とを備え、
前記制御部は、前記線状発光領域を発光状態に切替制御する場合、前記駆動データの書き替え対象となった前記液晶に対応する線状発光領域の輝度を時間の経過とともに上昇させ、当該輝度を前記液晶の応答が完了する時点よりも遅く、かつ前記複数の線状発光領域の何れかが発光状態又は非発光状態に切り替わる点灯切替時点までの間に予め定めた設定輝度に到達させることを特徴とする液晶表示装置。 A planar light emitting region composed of an organic EL element is provided, and the planar light emitting region is used as a backlight for a lighting device composed of a plurality of linear light emitting regions extending in a direction orthogonal to the vertical scanning direction of the liquid crystal. Liquid crystal display device
A liquid crystal drive unit for rewriting the drive data of the liquid crystal;
A control unit that switches and controls the plurality of linear light emitting regions between a light emitting state and a non-light emitting state so as to emit light in order in synchronization with vertical scanning of the liquid crystal;
When the control unit switches the linear light emitting region to the light emitting state, the control unit increases the luminance of the linear light emitting region corresponding to the liquid crystal to which the drive data is to be rewritten with the passage of time. To reach a predetermined set brightness until a lighting switching time point that is later than the time point when the response of the liquid crystal is completed and any of the plurality of linear light emitting regions is switched to a light emitting state or a non-light emitting state. A characteristic liquid crystal display device. 前記制御部は、前記液晶の駆動データの書き替え開始と同時に前記線状発光領域の切替制御を開始させることを特徴とする請求項１に記載の液晶表示装置。 The liquid crystal display device according to claim 1, wherein the control unit starts switching control of the linear light emitting region simultaneously with the start of rewriting of driving data of the liquid crystal. 前記制御部は、前記線状発光領域の非発光状態において前記有機ＥＬ素子に逆バイアス電圧を印加させ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 control unit applies a reverse bias voltage to the organic EL element in a non-light emitting state of the linear light emitting region. 前記制御部は、前記発光状態に切替制御した線状発光領域を、次フレームにおける前記駆動データの書き替え開始の直前に前記非発光状態へ切替制御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。 2. The control unit according to claim 1, wherein the control unit performs switching control of the linear light emitting region that is controlled to be switched to the light emitting state to the non-light emitting state immediately before the start of rewriting the driving data in a next frame. 2. A liquid crystal display device according to 2.
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WO2007108165A1 (en) * 2006-03-23 2007-09-27 Sharp Kabushiki Kaisha Liquid crystal display device
JP2008216630A (en) * 2007-03-05 2008-09-18 Matsushita Electric Ind Co Ltd Liquid crystal display device and method

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JP2947276B1 (en) * 1998-07-17 1999-09-13 日本電気株式会社 Driving method of organic EL device
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JP4269126B2 (en) * 2000-09-11 2009-05-27 カシオ計算機株式会社 Backlight and operation control method thereof
JP3780952B2 (en) * 2002-01-31 2006-05-31 株式会社豊田自動織機 Liquid crystal display
JP4371765B2 (en) * 2003-10-17 2009-11-25 Ｎｅｃ液晶テクノロジー株式会社 Liquid crystal display

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007108165A1 (en) * 2006-03-23 2007-09-27 Sharp Kabushiki Kaisha Liquid crystal display device
JP2008216630A (en) * 2007-03-05 2008-09-18 Matsushita Electric Ind Co Ltd Liquid crystal display device and method

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