JP2002099250A - Display device - Google Patents

Display device

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Publication number
JP2002099250A
JP2002099250A JP2000287499A JP2000287499A JP2002099250A JP 2002099250 A JP2002099250 A JP 2002099250A JP 2000287499 A JP2000287499 A JP 2000287499A JP 2000287499 A JP2000287499 A JP 2000287499A JP 2002099250 A JP2002099250 A JP 2002099250A
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Prior art keywords
backlight
luminance
illumination
brightness
unit
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JP3523170B2 (en
Inventor
Masahiro Baba
Kazuki Taira
和樹 平
雅裕 馬場
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Toshiba Corp
株式会社東芝
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Priority to JP2000287499A priority Critical patent/JP3523170B2/en
Publication of JP2002099250A publication Critical patent/JP2002099250A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/3413Details of control of colour illumination sources
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/342Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0238Improving the black level
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0242Compensation of deficiencies in the appearance of colours
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/0646Modulation of illumination source brightness and image signal correlated to each other
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0666Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

Abstract

PROBLEM TO BE SOLVED: To provide a display device which enables to enlarge a dynamic range even for a picture having large brightness inclination in a screen and displaying a high definition picture. SOLUTION: This display device is provided with picture displaying parts 11, 22, an illuminating part 12 which has plural illuminating regions which illuminate the inside of the picture displaying parts, luminous brightness controlling parts 14-18 which control the brightness of the respective illuminating regions of the illuminating part on the basis of an input picture signal and picture signal converting parts 19-21 which convert the input picture signal on the basis of brightness information with respect to the respective illuminating regions of the illuminating part which is obtained on the luminous brightness controlling parts and supplies the transferred picture signal toward the picture displaying parts.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、液晶表示装置等の表示装置に関する。 The present invention relates to relates to a display device such as a liquid crystal display device.

【0002】 [0002]

【従来の技術】液晶表示装置(LCD)を代表とする非発光型、すなわち表示画素自体が発光するのではなく、 BACKGROUND ART Non-luminous typified by liquid crystal display (LCD), i.e. instead of the light emitting display pixel itself,
画像情報に応じて透過率もしくは反射率を制御する表示装置は、周囲環境光を利用する一部の反射型表示装置を除き、表示画面を照明する照明装置を備えている。 Display device for controlling the transmittance or reflectance in accordance with image information, except for a portion of the reflective display device using ambient light, and a lighting device for illuminating the display screen. 通常、照明装置は定常点灯されており、一定の輝度で液晶表示部(液晶パネル)を照明している。 Normally, the lighting device is steady lighting, illuminates the liquid crystal display unit (liquid crystal panel) with a constant brightness.

【0003】液晶表示部を直接観視する直視型LCDにおいては、照明装置は平面形状の面発光素子であり、光源には主として冷陰極蛍光管が使用される。 [0003] In the direct-view LCD directly-viewing the liquid crystal display unit, the illumination device is a surface light-emitting element of planar shape, mainly cold cathode fluorescent tubes as a light source is used. このような平面バックライトは、蛍光管の配置によって直下型とサイドライト型に区分される。 Such planar backlight is classified into a direct type and a side light type depending on the arrangement of the fluorescent tubes. 前者は複数の蛍光管を液晶パネルの真下に配置した構造であり、後者は液晶パネル直下に導光板を配し、導光板の端面に蛍光管を配置して照明する方式である。 The former has a structure in which a plurality of fluorescent tubes beneath the liquid crystal panel, the latter arranged light guide plate directly below the liquid crystal panel is a method of illuminating by placing the fluorescent tube to the end face of the light guide plate. 直下型は輝度を高くできるため、 Because the direct type is capable of high luminance,
主として車載用、大型PCモニター用のLCDに、サイドライト型は消費電力が低く薄型化が可能なため、モバイル用の中小型PC用LCDに多く採用されている。 Primarily for automotive, the LCD for a large PC monitors, side light type is because it can be thinned low power consumption, it has been widely adopted for LCD small and medium-sized PC for mobile. 両者の方式とも、液晶表示画面に輝度ムラが生じないよう、液晶パネル直下に透過型拡散板を複数枚挿入するなどして、発光面全面にわたって均一な輝度分布が得られるようになっている。 Both schemes, so that uneven brightness on a liquid crystal display screen does not occur, such as by inserting a plurality of transmissive diffusion plate directly below the liquid crystal panel, a uniform luminance distribution over the light-emitting surface entire surface is adapted to be obtained.

【0004】また、近年携帯電話向けLCD用として、 [0004] In addition, as in recent years mobile phones for LCD,
バックライト光源にインバータを必要としない白色LE White LE that does not require an inverter for the backlight source
Dを用いる方式も提案されている。 Method using D has been proposed.

【0005】一方、従来時間的に一定であったバックライトの輝度を画像情報に応じて時間的に可変とすることにより、表示のダイナミックレンジを広げようとする提案もなされている。 On the other hand, by a time-variable in accordance with the luminance of a conventional time-constant backlight to the image information, it has been proposed to be widen the dynamic range of the display. すなわち、黒情報が多く表示される画像に対してはバックライトを暗く、白情報が多く表示される画像に対してはバックライトを明るく点灯する、 That is, darken the backlight for the image black level is displayed more brightly lit backlight for image white information is displayed a number,
というものである。 Is that.

【0006】上述したバックライト輝度を時間的に制御する方式は、従来のCRTに比べて狭いと言われているLCDのダイナミックレンジを広げる方式として有効なものである。 [0006] a method of controlling the backlight brightness described above temporally is valid as a method to extend the dynamic range of the LCD, which is said to narrower than the conventional CRT. しかしながら、バックライト輝度の制御を画面全体にわたって一括して行っているため、画面内に大きな輝度傾斜を生じるようなハイライト部分を多く含む画像に対しては、バックライト輝度が時間的に一定である従来の方式とダイナミックレンジは変わらず、CR However, since the performed together the control of the backlight brightness over the entire screen, a highlight portion such as occurs with large luminance gradient within the screen for many include image, the backlight luminance is temporally constant there is not changed the conventional method and dynamic range, CR
Tに比較してダイナミックレンジが低いという問題を解決することはできない。 It is impossible to solve the problem of dynamic range is lower than the T.

【0007】 [0007]

【発明が解決しようとする課題】このように、液晶表示装置に代表される従来の非発光型の表示装置では、CR BRIEF Problem to be Solved] Thus, the conventional non-luminous type display device typified by a liquid crystal display device, CR
Tに比べてダイナミックレンジが狭いという問題があり、その解決策として、バックライトの輝度を画像情報に応じて時間的に変化させる方式が提案されているが、 There is a problem that the dynamic range is narrower than the T, as a solution, although methods for temporally changed in accordance with brightness of the backlight to the image information has been proposed,
画面全体で一括してバックライト輝度を制御しているため、画面内に大きな輝度傾斜があるような画像に対してはダイナミックレンジを広げることが困難であった。 Since controlling the backlight brightness collectively on the entire screen, it is difficult to widen the dynamic range for the image as there is a large luminance gradient on the screen.

【0008】本発明は上記従来の課題に対してなされたものであり、画面内に大きな輝度傾斜があるような画像に対してもダイナミックレンジを拡大することができ、 [0008] The present invention has been made with respect to the conventional problems, can also be expanded dynamic range for the image as there is a large luminance gradient on the screen,
高品位の画像を表示することが可能な表示装置を提供することを目的としている。 And its object is to provide a display device capable of displaying high-quality images.

【0009】 [0009]

【課題を解決するための手段】本発明に係る表示装置は、画像表示部と、前記画像表示部の画像表示領域を照明するものであって、複数の照明領域を有する照明部と、入力画像信号に基づいて前記照明部の各照明領域の輝度を制御する照明輝度制御部と、前記照明輝度制御部で得られる前記照明部の各照明領域に対する輝度情報に基づいて前記入力画像信号を変換し、変換された画像信号を前記画像表示部に向けて供給する画像信号変換部と、を備えたことを特徴とする。 Display device according to the present invention SUMMARY OF THE INVENTION is for illuminating an image display section, an image display area of ​​the image display unit, a lighting unit having a plurality of illumination regions, the input image wherein an illumination luminance control unit that controls the luminance of each illumination area of ​​the illumination unit, and converting the input image signal based on the luminance information of each illumination area of ​​the illumination unit obtained by the illumination intensity control unit on the basis of the signal , characterized in that the converted image signal and an image signal conversion unit for supplying toward the image display unit.

【0010】前記画像信号変換部は、前記輝度情報に基づいて前記入力画像信号の階調を変換する機能を有することが好ましい。 [0010] The image signal conversion unit preferably has a function of converting the gradation of the input image signal based on the luminance information.

【0011】本発明では、入力画像信号に基づいて照明部の各照明領域の輝度が制御されることから、画面全体のうち、明るい画像情報を多く含むような表示部分に対しては照明光の輝度を高く、逆に暗い画像情報を多く含むような表示部分に対しては照明光の輝度を低くすることができ、画面全体のダイナミックレンジを拡大することができる。 In the present invention, since the luminance of each illumination area of ​​the illumination unit is controlled based on the input image signal, out of the entire screen, the illumination light to the display portion, such as containing a large amount of bright image information high brightness for the display portion, such as containing a large amount of dark image information conversely can reduce the intensity of the illumination light, it is possible to expand the dynamic range of the entire screen. ただし、照明領域毎に照明光の輝度を変化させることから、入力画像信号をそのままの階調で画像表示部に供給した場合には、表示画像の輝度が各照明領域間でずれてしまう。 However, since changing the brightness of the illumination light for each illuminated area, when supplied to the image display section as it tone input image signal, the luminance of the display image is shifted between each illumination area. 本発明では、各照明領域に対する照明光の輝度に応じて入力画像信号を変換するため、各照明領域の照明光の輝度に応じて変換された適正な階調により、各照明領域間で表示画像の輝度にずれのない適正な画像を得ることができる。 In the present invention, for converting an input image signal according to the brightness of the illumination light for each illumination area by proper gradation is converted according to the luminance of the illumination light of each illumination area, the display image between each illumination area proper image having no shift in the brightness of can be obtained.

【0012】以上のことから、本発明では、画面内に大きな輝度傾斜があるような画像に対しても、広いダイナミックレンジを有するコントラストの高い、高品位の適正な画像を表示することが可能となる。 [0012] From the foregoing, in the present invention, even for an image that there is a large luminance gradient on the screen, high contrast with a wide dynamic range, and can display an appropriate image of high quality Become.

【0013】なお、前記照明部を発光原理が互いに異なる複数種類の発光素子を用いて構成することにより、例えば、ある発光素子によって画面全体を照明し、他の発光素子によって各照明領域の輝度を変化させるといった、それぞれの発光素子の適性に応じた制御を行うことができる。 [0013] Incidentally, by constituting a light-emitting element of a plurality of types of light emission principles are different from each other the illumination unit, for example, to illuminate the entire screen by a certain light emitting element, the luminance of each illumination area by other light emitting element such changing can be controlled in accordance with the suitability of each of the light emitting element.

【0014】また、複数種類の発光素子を用いた場合、 [0014] In the case of using a plurality of types of light emitting elements,
一般的に発光素子の種類によって発光色が異なる(スペクトル分布が異なる)が、発光色の違いに応じた色補償を行う色補償部を設けることにより、色ずれの少ない高品位の画像を得ることが可能となる。 In general, the emission color varies depending on the type of light-emitting elements (spectral distribution is different) is, by providing the color compensation unit that performs color compensation according to the difference in emission colors, to obtain a high quality image with less color misregistration it is possible.

【0015】また、前記照明部の各照明領域を隔壁によって分割することにより、隣接する照明領域間における照明光の相互干渉を抑制することができ、より高品位の画像を得ることが可能となる。 Further, by dividing by the respective illumination areas the partition wall of the illumination unit, it is possible to suppress the mutual interference of the illumination light between adjacent illumination region, it is possible to obtain an image of higher quality .

【0016】 [0016]

【発明の実施の形態】まず、本発明の実施形態に係る表示装置の概要について説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of a display device according to an embodiment of the present invention.

【0017】本表示装置は大きく分けて、非発光型表示素子、複数に分割された照明領域を有する照明装置、各照明領域に対して独立に輝度を制御できる照明制御回路、及び画像信号を変換する画像変換回路を有している。 [0017] The display device is roughly divided into a non-luminous display device, an illumination device having an illumination region divided into a plurality, the illumination control circuit capable of controlling the luminance independently for each illumination area, and converts the image signal and an image converting circuit for.

【0018】非発光型表示素子としては、透過型液晶パネルが最適である。 [0018] As non-luminous display device is a transmissive liquid crystal panel is optimum. 透過型液晶パネルは多階調表示可能であれば良く、TFT等のスイッチング素子を備えたアクティブマトリクス型、パッシブマトリクス型を問わない。 Transmissive liquid crystal panel may be a multi-gradation can be displayed, an active matrix type having a switching element such as TFT, regardless a passive matrix. 液晶表示モードについても、現在実用化されているTN、VA、IPS、OCBなどのネマチック系液晶の他、反強誘電性液晶などのスメクチック系液晶も使用可能である。 Also any liquid crystal display mode, TN that is currently commercialized, VA, IPS, another liquid crystal nematic such OCB, smectic type liquid crystal, such as anti-ferroelectric liquid crystal can be used. また、電気的に多階調表示できないSSFL Also, it can not be electrically multi-tone display SSFL
Cなどでも、時間的にスイッチングを行うことによって擬似的に多階調表示が可能であることから、使用可能である。 In C, etc. because it is possible pseudo multi-gradation display by performing a temporally switching, it can be used.

【0019】空間的に輝度を制御するためには、光源を複数備えるか、或いは光源光を領域毎に遮断及び透過できるシャッタを設ければよい。 [0019] In order to control the spatial brightness, or provided with a plurality of light sources, or the light source light may be provided shutter capable of blocking and transmission for each region. 光源を複数備える場合は、蛍光管を複数列設け、それらを独立に発光制御するか、LEDを組み合わせるのが効果的である。 When provided with a plurality of light sources, fluorescent tubes provided a plurality of rows, they either light emission control independently combine LED is effective. 特に、画面全体を一括して輝度制御する場合には蛍光管の輝度を制御し、特定の領域について輝度制御する場合にはLE In particular, when in the case of brightness control collectively the entire screen by controlling the brightness of the fluorescent tube and brightness control for a specific region LE
Dを用いるのが望ましい。 It is desirable to use D. ラスタ表示など画面全体にわたって階調が均一な場合にはバックライトの輝度が面内均一であることが望ましく、画面内に明暗が生じる場合には画像情報に応じて連続的な輝度変化が生じることが望ましい。 It is desirable brightness of the backlight is within the plane uniform when the gradation across the entire screen, such as a raster display is uniform, if the brightness is caused to continuously change in luminance according to the image information is generated in the in the screen It is desirable

【0020】画像変換回路は、バックライトの輝度分布情報に基づき、液晶パネルに入力する画像情報を変換することで、画面内で正しい階調再現が得られるようにする回路である。 The image conversion circuit, based on the brightness distribution information of the backlight, to convert the image information to be input to the liquid crystal panel, a circuit for the correct tone reproduction is obtained at the screen. バックライトの輝度制御と画像情報変換は、例えば以下のような手順によって行われる。 Brightness control and image information converting backlight is carried out by a procedure such as the following.

【0021】まず、入力された画像情報をバックライトの制御領域単位毎に分析し、平均もしくは最頻の階調と、最大階調及び最小階調を抽出する。 [0021] First, to analyze the image information input to each control area unit of the backlight, extracts the gray level of the average or modal, the maximum gradation and minimum gradation. これらの画像情報を基に、バックライトの輝度分布が決定される。 Based on these image data, the luminance distribution of the backlight is determined. すなわち、画像情報が明るい輝度情報を多く含む場合はバックライトの輝度を高く、暗い輝度情報を多く含む場合はバックライトの輝度を低く設定する。 That is, if the image information contains many bright luminance information increase the brightness of the backlight is set lower the luminance of the backlight when containing many dark luminance information.

【0022】次に、このバックライト制御結果を基に、 [0022] Then, on the basis of the backlight control result,
より小面積の画像領域毎に階調シフト量を決定する。 Determining a gray level shift amount for each image region of the smaller area. このとき、画像領域を照明するバックライト輝度制御値が同一であっても、階調シフト量が同一であるとは限らない。 In this case, even with the same backlight brightness control value to illuminate the image area, not necessarily the amount gradation shift is the same. なぜならば、画像領域を直接照明する輝度制御値が同じであっても、周りの画像情報によって画像照明領域周辺の輝度制御値が変化し、バックライト照明領域間のクロストークによって画像領域を照明する輝度値が変化するからである。 This is because, even luminance control value to illuminate the image area directly same luminance control value for the peripheral image illumination area is changed by the image information around to illuminate the image area by the cross talk between backlight illumination region This is because the luminance value changes. 従って、画像を照明する輝度制御値のマトリクス情報に基づいて、適正な階調シフト量が決定される。 Therefore, based on the matrix information of the brightness control values ​​to illuminate the image, correct gradation shift amount is determined. 階調シフト量も一般には線形ではなく、階調と表示輝度レベルを関係付けるγ特性に従って非線形にシフトされる。 Gradation shift amount generally is not linear, it is shifted to the non-linear according γ characteristic that relates gray scale display brightness level.

【0023】以下、本発明の具体的な実施形態について図面を参照して説明する。 [0023] Hereinafter, will be described with reference to the drawings specific embodiments of the present invention.

【0024】(実施形態1)図1は、本実施形態の表示装置本体の構成例を示した図である。 [0024] (Embodiment 1) FIG. 1 is a diagram showing a configuration example of a display device main body of the present embodiment. 表示装置本体は、 Display apparatus main body,
透過型液晶ライトバルブ(LCD11)と背面照明装置(バックライト12)から構成されており、LCD背面からの照明により画像が表示される。 A transmissive liquid crystal light valve (LCD 11) is composed of a backlight device (backlight 12), an image is displayed by the illumination of an LCD back.

【0025】LCD11、バックライト12は各々複数の領域に分割されており、LCD11においては、領域毎のRGB階調変換データに基づいて画素毎にRGB信号が変調制御される。 The LCD 11, the backlight 12 is respectively divided into a plurality of areas, in the LCD 11, RGB signal is modulated controlled for each pixel based on the RGB gradation conversion data for each area. バックライト12においては、L In the backlight 12, L
CD12の領域毎の画像輝度情報に基づいて輝度制御が行われる。 Brightness control is performed based on the image luminance information of each region of CD12. 本実施形態においては、図2に示すように、 In the present embodiment, as shown in FIG. 2,
LCD11を6×8領域(図2(a))、バックライト12を3×4領域に分割した(図2(b))。 LCD11 a 6 × 8 regions (FIG. 2 (a)), and dividing the backlight 12 to 3 × 4 region (Figure 2 (b)). 便宜上、 For convenience,
LCD11における領域を(i,j)、バックライト1 The region in LCD11 (i, j), the backlight 1
2における領域を[i,j]で示す。 The region in the 2 indicated by [i, j].

【0026】図3は、本実施形態の表示装置における主として信号処理について示したブロック図である。 [0026] FIG. 3 is a block diagram showing the predominantly signal processing in the display device of the present embodiment.

【0027】RGB入力画像信号は、一旦フレームメモリ13に蓄積された後、LCD領域毎に読み出される。 The RGB input image signal is once stored in the frame memory 13 is read out for each LCD area.
読み出されたデータに基づいて画像輝度演算回路14でLCD領域毎の輝度値が算出され、算出されたLCD領域毎の輝度データが画像輝度データ保持部15に送られる。 Brightness value for each LCD area image luminance calculation circuit 14 based on the read data are calculated, the luminance data for each LCD area calculated is sent to the image luminance data holding unit 15. 画像輝度データ保持部15からのLCD領域毎の輝度データに基づき、バックライト領域毎のバックライト輝度レベルがB/L(バックライト)輝度演算回路16 Based on the luminance data for each LCD area from image luminance data holding unit 15, backlight luminance level of a backlight for each region B / L (backlight) luminance operation circuit 16
によって算出され、算出されたバックライト領域毎の輝度データがバックライト輝度データ保持部17に送られる。 Calculated by the luminance data of the backlight for each region calculated is sent to the backlight luminance data holding unit 17. バックライト輝度制御回路18は、バックライト輝度演算回路16の演算結果に基づき、バックライト輝度を領域毎に制御する。 Backlight brightness control circuit 18 on the basis of the calculation results of the backlight luminance calculating circuit 16 controls the backlight brightness for each region.

【0028】一方、フレームメモリ13に蓄積されたR On the other hand, it stored in the frame memory 13 R
GB入力画像信号は1画素毎に順次読み出され、階調変換回路19により該画素領域を照明するバックライト1 GB input image signal is sequentially read for each pixel, backlight 1 which illuminates the pixel area by the gradation conversion circuit 19
2の輝度データに基づき階調変調を受ける。 Receive a tone modulated on the basis of a second luminance data. さらに、該画素領域周辺におけるバックライト輝度情報に基づき、 Furthermore, based on the backlight brightness information in the peripheral pixel region,
階調補正用LUT(ルックアップテーブル)20のデータを用いて、階調補正回路21により適正な階調補正を受け、最終的にLCDドライバ22に入力されるRGB Using the data of the gradation correction LUT (look-up table) 20, receives a proper gradation correction by the gradation correction circuit 21, eventually RGB input to the LCD driver 22
信号(R”G”B”)に変換される。以下、このシーケンスについて詳述する。 It is converted into a signal (R "G" B "). Is described in detail below this sequence.

【0029】図4は、本実施形態におけるバックライトの輝度レベルと、輝度及び階調信号との対応関係を示した図である。 FIG. 4 is a diagram showing the luminance level of the backlight in the present embodiment, the correspondence between the luminance and gray scale signals.

【0030】本実施形態では、バックライトの輝度レベル制御を3段階とした。 [0030] In this embodiment, the three stages of the luminance level control of the backlight. また、本実施形態のLCDの仕様は、コントラストが200、ドライバへの入力信号レベルがRGB各8bitであり、γ値(入力信号レベル対透過率)はCRTと同様の2.2である。 Also, LCD specifications of this embodiment, the contrast is 200, the input signal level to the driver is RGB each 8bit, gamma value (input signal level versus transmittance) is 2.2 same as the CRT. LCDに白表示信号(R=G=B=255)を入力した際に得られる白輝度として、レベル2における白表示輝度250c White display signal (R = G = B = 255) as a white luminance obtained when the input to the LCD, the white display luminance 250c at level 2
d/m 2を基準(ゲイン1)とし、レベル1のバックライト輝度を0.2倍、レベル3では3.0倍に設定した。 and d / m 2 the reference (gain 1), 0.2 times the backlight luminance levels 1, was set at 3.0 times the level 3.

【0031】このとき、各バックライト輝度レベルにおける入力RGB信号対輝度は、 B=G{K+[W−K]×(S RGB /255γ } (1) で表される。 [0031] In this case, the input RGB signal to a luminance of each backlight luminance level, B = G {K + [ W-K] × (S RGB / 255) γ} represented by (1). ここで、B:バックライト輝度(cd/m Here, B: backlight luminance (cd / m
2 )、G:ゲイン、W:ゲイン1における白表示輝度、 2), G: gain, W: white display brightness in the gain 1,
K:ゲイン1における黒表示輝度(=W/コントラスト)、S RGB :入力信号(0〜255)、γ:ガンマ値、である。 K: black display brightness in the gain 1 (= W / contrast), S RGB: Input signal (0 to 255), gamma: a gamma value. 図5(a)及び図5(b)は、各バックライト輝度レベルにおける、入力RGB信号レベルと画面輝度との関係を示した図である。 FIGS. 5 (a) and 5 (b), in each backlight luminance level is a diagram showing the relationship between the input RGB signal level and screen brightness.

【0032】図6(a)及び図6(b)は、バックライトレベル1〜3の全範囲を用いて8bit表示を行った場合の、階調信号R'G'B'と画面輝度との関係を示した図である。 [0032] FIGS. 6 (a) and 6 (b), in the case of performing 8bit displayed using the full range of backlight levels 1-3, the tone signal R'G'B 'as the screen brightness is a diagram showing the relationship.

【0033】階調信号R'G'B'のレベルS R'G'B'と画面輝度Bとの関係は、 B=K min +[W max −K min ]×(S R'G'B' /255) γ (2) で表される。 The relationship between screen brightness B 'level S R'G'B' of gradation signals R'G'B is, B = K min + [W max -K min] × (S R'G'B '/ 255) represented by the gamma (2). ここで、W maxは最大白表示輝度、K min Here, W max is the maximum white display brightness, K min
は最小黒表示輝度であり、本実施形態ではそれぞれ、レベル3における白表示輝度(750cd/m 2 )、レベル1における黒表示輝度(0.25cd/m 2 )である。 Is the minimum black display luminance, respectively in the present embodiment, the white display luminance at level 3 (750cd / m 2), a black display luminance at level 1 (0.25cd / m 2). 各レベルの白、黒表示輝度から階調信号R'G' Each level of white, gray scale signal R'G from black display luminance '
B'における各レベルの表示可能信号範囲を求めることができ、レベル1では0〜74、レベル2では12〜1 It is possible to obtain the displayable signal range of each level in the B ', Level 1 0-74, Level 2 1:12
54、レベル3では22〜255となる。 54, the Level 3 22-255.

【0034】バックライト輝度を制御する本発明において、入力信号RGBは階調信号R'G'B'に他ならないから、(1)、(2)式を用いてLCDドライバに入力すべき階調信号R”G”B”を求めることができる。 [0034] In the present invention for controlling the backlight brightness, because the input signal RGB is nothing but the tone signal R'G'B ', (1), the gradation to be input to the LCD driver by using the expression (2) it is possible to obtain the signal R "G" B ".
入力階調信号R'G'B'とLCD出力用階調信号R” Input gradation signal R'G'B 'as the LCD output gradation signal R "
G”B”との関係を図7に示す。 The relationship between G "B" shown in FIG. γ値が1でない場合には両者は非線形の関係となるが、実際には図7に示すようにほぼ線形の関係で近似できるため、階調変換処理は小規模な回路で実現可能である。 The both when γ value is not 1 becomes a non-linear relationship, for actually be approximated by a linear relationship as shown in FIG. 7, the gradation conversion processing can be realized by a small-scale circuit.

【0035】次に、階調変換処理後に行う階調補正方法について、これまでに述べてきたバックライト輝度レベルの決定方法とともに具体的に説明する。 [0035] Next, the gradation correction process performed after the gradation conversion processing will be specifically described with backlight luminance level determination method of which has been described so far.

【0036】図8は、フレームメモリに蓄積された画像に対応した入力RGB信号レベルについて、図2(a) [0036] Figure 8, the input RGB signal level corresponding to the image stored in the frame memory, FIGS. 2 (a)
の画素領域毎に平均輝度階調を算出した結果の一例を示した図である。 Of each pixel region is a diagram showing an example of a result of calculating the average luminance level. RGB信号と信号輝度レベルYとの関係は、各RGB信号の視感度を考慮して Y=0.30R+0.59G+0.11B (3) のように表すことができる。 The relationship between the RGB signal and the signal luminance level Y can be expressed as visibility in consideration of Y = 0.30R + 0.59G + 0.11B (3) of the RGB signals. (3)式の係数は、RGB (3) coefficient of expression, RGB
各色度点と白色点、すなわち表示系の仕様により決定される。 Each chromaticity point and the white point, i.e. is determined by the specifications of the display system. また、誤差は増えるが、計算負荷を軽減するために、視感度の高いG値で代替することも可能である。 Further, the error increases, but in order to reduce the computational load, it is possible to substitute with high visual sensitivity G value.

【0037】本実施形態においては、2×2画素領域がバックライト単位領域に相当(図2参照)しており、図8からバックライト領域毎に平均輝度が図10(a)のように算出できる。 [0037] In this embodiment, calculated as 2 × 2 pixel region is equivalent to the backlight unit area (see FIG. 2), FIG average luminance to the backlight for each region from FIG. 8 10 (a) it can. 同様に、画素領域毎の信号レベルの最大値、最小値から、バックライト領域上のRGB信号の最大値、最小値が算出可能である。 Similarly, the maximum value of the signal level for each pixel region, from a minimum value, maximum value of the RGB signal on the backlight area, the minimum value can be calculated.

【0038】バックライト各領域の輝度レベルは、これら平均、最大、最小輝度信号レベルから、図9に示すような手順で決定される。 The backlight brightness level of each region, these average, maximum, minimum luminance signal level is determined by the procedure as shown in FIG.

【0039】すなわち、例えば平均輝度信号レベルに基づいて適当なバックライト輝度レベルを選択し、他のパラメータ(ここでは最大、最小値)が、選択されたバックライト輝度レベルにおける表示可能信号レベル範囲に収まるかどうかを判断する。 [0039] That is, for example, based on an average luminance signal level to select the appropriate backlight luminance level (maximum where the minimum value) other parameters, the displayable signal level range in the backlight luminance level selected it is determined whether or not fit. いずれかのパラメータが範囲外の場合は、繰り返し処理によりバックライト輝度レベルが選択される。 If any parameter is out of range, the backlight luminance level is selected in the iteration. 全てのパラメータがいずれのバックライト輝度レベルにおいても表示可能信号レベル範囲に含まれない場合には、最小値もしくは最大値のいずれかが含まれるようなバックライト輝度レベルを選択する。 If all parameters are not included in the displayable signal level range in any of the backlight brightness levels, selects the backlight brightness levels as contained either the minimum value or maximum value.
最大値、最小値のうちどちらを優先的に範囲内とするかは任意であり、自動或いは手動で判断基準を切り替えても良い。 Maximum value, which of the minimum value is arbitrarily either within preferentially range, may be switched automatically or manually criterion. 自動的に切り替える際の一方針としては、平均輝度信号レベルが表示可能信号レベル範囲中央に最も近く位置するようなバックライト輝度レベルを選択する、 An policies when switching automatically selects the backlight brightness level such that the average luminance signal level is located closest to the displayable signal level range center,
等があげられる。 And the like. 固定の場合は、視感度的に敏感な最小値側を優先するのが一般的に望ましいが、表示画像の絵柄にも依存するので一概には言えない。 For fixed is to prioritize luminosity to sensitive minimum value side is generally desirable, it can not be said sweepingly because it depends on the pattern of the display image.

【0040】本実施形態では、図10(a)に示したようなバックライト領域毎のRGB表示平均輝度信号レベルから、図10(b)に示したようなバックライト輝度レベルを選択した。 [0040] In this embodiment, the backlight in each area of ​​the RGB display average luminance signal level as shown in FIG. 10 (a), were selected backlight luminance level as shown in Figure 10 (b).

【0041】フレームメモリから順次読み出されたRG [0041] sequentially read from the frame memory RG
B信号レベルは、各照明領域のバックライト輝度レベル情報(図10(b)参照)から、図7に示すような関係に基づいて階調変換が行われる。 B signal level, from the backlight luminance level information of each illumination region (see FIG. 10 (b)), the gradation conversion based on the relationship shown in FIG 7 is performed. しかしながら、以下に示すような理由により、階調補正処理を行う必要が生じる。 However, for the reasons described below, it is necessary to perform gradation correction processing.

【0042】図11は、図10(b)において輝度レベル1を選択した領域[2,2]と、[2,2]の画面下側に位置し、輝度レベル3を選択した領域[3,2]の白表示時における輝度の空間分布を模式的に示した図である。 [0042] Figure 11 and 10 an area [2,2] selecting a brightness level 1 (b), the located lower part of the screen of the [2,2], the region [3 selects the brightness level 3, the spatial distribution of luminance in the white display of 2] is a diagram schematically showing.

【0043】バックライト輝度を領域毎に変調すると、 [0043] Modulating the backlight brightness for each region,
照明領域間のクロストークにより、ある画素領域を照明するバックライト輝度には、直下のバックライト領域輝度だけではなく、隣接照明領域の輝度が重畳される。 Cross-talk between the illumination area, the backlight brightness to illuminate a certain pixel area, not only the backlight region brightness immediately below, the luminance of the adjacent illumination region is superimposed. すなわち、隣接領域からの照明光の回り込みにより、階調変換に使用したバックライト輝度から実際のバックライト輝度がずれる(照明誤差)という現象が生ずる。 That is, the diffraction of the illumination light from the adjacent area, the actual luminance of the backlight is deviated from the backlight luminance using the gradation conversion phenomenon (illumination errors) occurs.

【0044】図11では、簡単のために二つの領域間のスロストークを示したが、実際には図10(b)に示すよう[2,2]領域の周囲の領域すなわち、[1,1]、 [0044] In Figure 11, it showed Surosutoku between two regions for simplicity, actually, as shown in FIG. 10 (b) [2,2] of the surrounding area regions or, [1,1] ,
[1,2]、[1,3]、[2,1]、[2,3]、 [1,2], [1,3], [2,1], [2,3],
[3,1]、[3,2]、[3,3]において選択された輝度レベルの組み合わせにより、実際のバックライト輝度分布が決定される。 [3,1], [3,2], the combination of the luminance level selected in [3,3], the actual backlight luminance distribution is determined. 照明領域の分割数、領域面積、 Division of the illumination region, region area,
バックライトの設計等によってクロストークが決定されるため、条件によっては、隣接領域以外の照明領域における輝度レベル変化の影響を受けることもあり得る。 Because crosstalk is determined by the design of the backlight, depending on conditions, it may also be affected by the brightness level changes in the illumination region other than the adjacent region. 例えば、ある画素領域について輝度レベル1を選択したバックライトの実輝度が、階調変換時の輝度データに対して20%の誤差を含む(20%輝度が高い)場合には、 For example, the actual luminance of the backlight selected brightness level 1 for a pixel region (high 20% brightness) containing 20% ​​error with respect to the luminance data at the time of gradation conversion in the case,
図12に示すように2〜5階調程度の階調変換誤差が生じ、画素領域間の擬似輪郭や階調反転などの妨害として視認されることになる。 Gradation conversion error of about 2-5 gradation occurs as shown in FIG. 12, it is to be viewed as interference like pseudo contour and gradation inversion between the pixel regions.

【0045】照明誤差による階調変換誤差を補償するため、本実施形態では図3に示すように、階調補正用LU [0045] To compensate for gradation conversion error due to lighting error, in the present embodiment, as shown in FIG. 3, LU gradation correction
T20を使用して階調補正回路21により最終的なLC Final LC by the gradation correction circuit 21 using the T20
Dドライバ用信号R”G”B”を出力するようにした。 And it outputs a signal R "G" B "for D driver.
階調補正用LUT20には、画素領域毎に、あるバックライト照明領域の輝度レベルとそれに隣接するバックライト照明領域の輝度レベルの組み合わせに対応した階調補正テーブルデータが格納されており、バックライトの輝度レベル情報を参照しながら階調補正量を決定するようになっている。 A gradation correction LUT20, for each pixel region, and the gradation correction table data corresponding to a combination of luminance levels of a backlight illumination area adjacent thereto and the luminance level of a backlight illumination area is stored, the backlight It is adapted to determine the gradation correction amount by referring to the luminance level information.

【0046】以上のように、バックライト輝度レベルに応じた階調補正を施すことにより、妨害の無い表示が可能となる。 [0046] As described above, by performing tone correction according to the backlight luminance level, it is possible to display without disturbance. バックライト輝度制御を行わない従来の表示(白輝度250cd/m 2 、コントラスト200)に対し、本実施形態においては、白輝度750cd/m 2 The backlight display of conventional not performed brightness control on (white luminance 250 cd / m 2, the contrast 200), in the present embodiment, the white luminance 750 cd / m 2,
実効コントラスト3000の、高品位な表示を行うことが可能となる。 Of the effective contrast 3000, it is possible to perform high-quality display.

【0047】次に、本実施形態においてバックライトを領域毎に輝度制御する具体的構成について説明する。 [0047] Next, a specific configuration of brightness control of the backlight for each region in this embodiment.

【0048】図13は、図1における主としてバックライト12の構造を模式的に示した図である。 [0048] Figure 13 is a diagram mainly showing the structure of the backlight 12 schematically in FIG. 本例では、 In the present example,
冷陰極蛍光管101を複数本、LCD11直下に配置した直下型構造となっている。 A plurality of the cold cathode fluorescent tube 101, and has a direct type structure directly under LCD 11.

【0049】バックライト12の各照明領域は、図13 [0049] Each illumination area of ​​the backlight 12, 13
に示すように、反射板を兼ねた不透明な隔壁102によって仕切られており、隔壁を突き抜ける形で冷陰極蛍光管101が配置されている。 As shown in, are partitioned by the opaque partition wall 102 which also serves as a reflector, the cold cathode fluorescent tube 101 is arranged in a manner penetrating the septum. 特に図示していないが、これら蛍光管101を定常点灯した場合、隔壁102の影などは生じずに、面内でほぼ均一にLCD11を照明する。 Although not particularly shown, when these fluorescent tubes 101 and stationary lighting, without causing the shadows etc. of the partition wall 102, to illuminate the LCD11 substantially uniform in the plane. また、蛍光間102下には、輝度調節用のLED In addition, the 102 lower inter fluorescent, LED for brightness adjustment
(図示省略)が各領域内に配置されている。 (Not shown) are disposed within each region.

【0050】図14は、バックライト12の断面構造を示した図である。 [0050] Figure 14 is a view showing a sectional structure of the backlight 12. 本例においては、通常の直下型バックライト構造と同様に、反射板の上方に冷陰極蛍光管を配置し、さらにその上方に、輝度を均一化するための第1 In this example, as in the conventional direct-type backlight structure, above the reflector plate arranged cold cathode fluorescent tubes, further thereabove, a first for uniform brightness
拡散シート、正面輝度ゲイン向上用のプリズムシート、 Diffusion sheet, a prism sheet for front luminance gain improvement,
第2拡散シートを配置するとともに、蛍光管直下に白色のLEDチップ103を配置している。 With arranging the second diffusion sheet are arranged a white LED chip 103 directly below the fluorescent tube. このLED10 This LED10
3には、正面光度の高いレンズタイプでは無く、視角の広い、いわゆるオーバルタイプのLEDを使用している。 3 is not a high lens type of front brightness, wide viewing angle, using the LED of the so-called oval type.

【0051】このように、従来光取り出し効率の悪かった蛍光管の直下にLEDを配置することで、蛍光管の光利用効率の低下が抑制されるとともに、LEDの影などが輝度の均一性に影響を及ぼすことが防止される。 [0051] Thus, by arranging the LED directly below was bad fluorescent tube of the conventional light-extraction efficiency, along with reduction in the light use efficiency of the fluorescent tube is suppressed, and the shadow of the LED to the uniformity of brightness it is possible to prevent the influence. また、LEDからの発光が蛍光管の存在する法線方向に抑制された出射分布をとるので、両者の光利用効率を最大限に活用することができる。 Further, since the light emission from the LED takes presence exit distribution is suppressed in the normal direction of the fluorescent tube, it is possible to take advantage of both the light utilization efficiency the most.

【0052】図15は、蛍光管101とLED103の点灯方法について示した図である。 [0052] Figure 15 is a diagram showing the lighting method of the fluorescent tube 101 and LED 103. 本例では、図15に示すように、蛍光管101をインバータ回路104によって定常点灯とし、B/L輝度制御回路105(図3におけるB/L輝度制御回路18に対応)によりLED1 In this example, as shown in FIG. 15, the fluorescent tube 101 and stationary lighting by the inverter circuit 104, the B / L luminance control circuit 105 (corresponding to the B / L brightness control circuit 18 in FIG. 3) LED1
03で輝度制御を行うようにした。 And to perform brightness control 03. LED103の輝度制御は制御信号に従って行われ、照明領域毎にセグメント的に制御される。 Brightness control LED103 is performed according to the control signal is segmented controlled for each illumination area. 照明輝度の最も低いバックライト輝度レベル1では、蛍光管101のみが点灯しており、L The most at low backlight luminance level 1 of the illumination brightness, only the fluorescent tube 101 is lit, L
EDは発光しない。 ED does not emit light. 輝度レベル2及び輝度レベル3において、LED103への電流量を制御することで、2段階にLED103の発光強度を制御し、所望のバックライト輝度が得られる。 In the brightness level 2, and the brightness level 3, by controlling the amount of current to the LED 103, in two stages by controlling the emission intensity of the LED 103, the desired backlight luminance can be obtained.

【0053】このような点灯方式をとることで、照明均一性及び色度均一性に優れた蛍光管により全体の照明均一化を行うことができるとともに、蛍光管は定常点灯されるため複数のインバータ回路を必要としない。 [0053] By employing such a lighting method, it is possible to perform the entire illumination uniformity of the excellent fluorescent tube lighting uniformity and chromaticity uniformity, a plurality for fluorescent tubes are rated operation inverter It does not require a circuit. また、 Also,
応答性に優れるとともに、直流点灯によって制御性に優れたLEDを、効果的に輝度向上目的で使用可能となる。 Excellent in responsiveness, excellent LED controllability by DC lighting, made available by effectively brightness enhancement purposes. さらには、本点灯方式と従来のバックライト定常点灯方式の切り換えが容易になるため、使用目的に応じて適宜表示方法を選択することが可能となる。 Furthermore, since the switching of the lighting system and the conventional backlight steady lighting system is facilitated, it is possible to select an appropriate display method according to the intended use.

【0054】なお、図15では特に明示しなかったが、 [0054] It should be noted that, although not explicitly, especially in FIG. 15,
照明領域内のLEDの電流量を個別に調整することにより、LED点灯時における照明領域内の輝度均一性を向上させることが可能である。 By adjusting the current amount of the LED illumination area separately, it is possible to improve the luminance uniformity of the illumination area at the time of LED lighting.

【0055】図16は、白色LED(日亜化学製 NS [0055] FIG. 16, a white LED (Nichia Chemical Co., NS
PW300PS)と冷陰極蛍光管(ハリソン電機製 2 PW300PS) the cold cathode fluorescent tube (Harrison Denki Ltd. 2
25L3PFJ)を組み合わせた場合の発光スペクトル分布と、TFT−LCD内に設けられた代表的なカラーフィルタの分光透過率特性を示した図である。 And the emission spectrum distribution when combining 25L3PFJ), a diagram showing a typical spectral transmittance characteristics of color filters provided in the TFT-LCD.

【0056】一般的に、冷陰極蛍光管と白色LEDの発光スペクトルは著しく異なっており、白色LEDによって輝度ゲインを変化させると、白色点及びRGB色度点にシフトが生じる。 [0056] In general, the emission spectrum of a cold cathode fluorescent tube and a white LED are significantly different, varying the brightness gain by the white LED, the white point and the shift in the RGB chromaticity points occurs.

【0057】図17は、図4にしたがって、図16に示した白色LEDの輝度ゲインを変化させた場合の、白色点及びRGB色度点を示した図である。 [0057] Figure 17 in accordance with FIG. 4, in the case of changing the brightness gain of the white LED shown in FIG. 16 is a diagram showing the white point and the RGB chromaticity points. 色度シフトが著しく大きいと、輝度レベルの異なる照明領域間で色再現誤差が生じ、ブロックノイズとして認識される他、CM When the chromaticity shift is remarkably large, cause color reproduction error between luminance levels different illumination regions, in addition to being recognized as a block noise, CM
S(カラーマネジメントシステム)における正確な色再現への障害となる。 An obstacle to accurate color reproduction in S (color management system).

【0058】色度シフトを低減させるためには、白色L [0058] In order to reduce the chromaticity shift, white L
EDと蛍光管のスペクトルを調整することにより、白色点をできるだけ一致させるようにする。 By adjusting the spectrum of the ED and the fluorescent tube, so as to match as possible white point. 図16においては、ブルカラーフィルタのカットオフ特性を500nm In FIG. 16, 500 nm cut-off characteristics of the cable color filter
程度に設定し、白色LEDのグリーン波長領域における蛍光体発光スペクトル成分を含まないようにするなど、 Set to the extent, such as to not include the phosphor emission spectrum components in the green wavelength region of the white LED,
カラーフィルタの色純度を上げることが効果的である。 It is effective to increase the color purity of the color filter.

【0059】しかしながら、このような対策を施しても色度シフト低減効果が不十分な場合には、以下の例によって色度シフトを解消することが可能である。 [0059] However, such chromaticity shift-reducing effect can be subjected to measures to be insufficient, it is possible to eliminate the following examples chromaticity shift. 図18 Figure 18
に、その一例を示したブロック図である。 In a block diagram illustrating an example.

【0060】図18では、図3に示した階調変換回路1 [0060] In Figure 18, the gradation conversion circuit shown in FIG. 3 1
9、階調補正用LUT20及び階調補正回路21を拡張し、輝度レベルだけではなく、色度値に対する階調変換及び補正を行うために、色度計算回路31、色補正用L 9, it extends the gradation correction LUT20 and gradation correction circuit 21, not only the luminance level, in order to perform the gradation conversion and the correction for chromaticity values, chromaticity calculation circuit 31, a color correction L
UT32、色補正回路33及びRGB信号変換回路34 UT32, the color correction circuit 33 and the RGB signal conversion circuit 34
を設けている。 A is provided.

【0061】図18において、色度計算回路31では、 [0061] In FIG. 18, the chromaticity calculating circuit 31,
RGB入力信号と、入力信号値から決定されるバックライト輝度レベルとに基づき、三刺激値XYZが計算される。 And RGB input signal, based on the backlight brightness level determined from an input signal value, tristimulus values ​​XYZ is calculated. このようにして予想された三刺激値に対し、バックライト照明分布に起因する補正値及び色補正量を、色補正用LUT32を用いて変換することで、修正XYZを求める。 To tristimulus values ​​was expected this manner, the correction value and the color correction amount due to the backlight illumination distribution, by conversion using the color correction LUT 32, obtains a correction XYZ. さらに、(X,Y,Z)から(R,G,B)への逆変換により、LCDドライバ22に印加する信号レベルR”G”B”を計算する。 Moreover, to calculate the (X, Y, Z) by the inverse conversion of the (R, G, B), the signal level R "G" B applied to the LCD driver 22 '.

【0062】例えば、輝度レベル1、すなわち冷陰極管のみの照明条件において、RGB入力信号に対してγ特性を考慮したRGB出力信号(R',G',B')に対する三刺激値を(X',Y',Z')とする。 [0062] For example, the brightness level 1, i.e. in the lighting conditions only the cold cathode tube, RGB output signals in consideration of the γ characteristic for RGB input signals (R ', G', B ') tristimulus values ​​for (X ', Y', and Z '). (R', (R ',
G',B')から(X',Y',Z')への変換は、3 G ', B') from (X ', Y', the conversion to Z ') is 3
×3の線形マトリクスMを用いて、 (X',Y',Z') t =M(R',G',B') t (4) のように表される。 × using a linear matrix M of 3, (X ', Y' , Z ') t = M (R', G ', B') represented as t (4). ここで(X',Y',Z') tは、 Where (X ', Y', Z ') t is
(X',Y',Z')の転置行列を表す。 (X ', Y', Z ') represents a transposed matrix of. マトリクスM Matrix M
の各要素は、各RGB表示、(1,0,0)、(0, Each element of each RGB display, (1, 0, 0), (0,
1,0)、(0,0,1)をRGB出力信号として与えた場合のXYZ三刺激値である。 1,0), a XYZ tristimulus value when given (0,0,1) as the RGB output signals.

【0063】一方、白色LEDのみの照明条件において得られる三刺激値XYZとRGB出力信号とを関係付ける線形マトリクスを同様に定義することが可能である。 [0063] On the other hand, it is possible to similarly define the linear matrix relating the tristimulus values ​​XYZ and RGB output signal obtained in the illumination condition of the white LED only.
このマトリクスをM'とすると、冷陰極管と白色LED When this matrix and M ', a cold cathode tube and a white LED
とを組み合わせた照明によって得られる、(R', Obtained by the illumination of a combination bets, (R ',
G',B')から(X',Y',Z')への変換の関係式は、 (X',Y',Z') t =M(R',G',B') t +gM'(R',G',B') t =(M+gM')(R',G',B') t =N(R',G',B') t (5) N=M+gM' (6) となる。 G ', B') from (X ', Y', Z ' equation conversion to) is, (X', Y ', Z') t = M (R ', G', B ') t + gM '(R', G ', B') t = (M + gM ') (R', G ', B') t = N (R ', G', B ') t (5) N = M + gM' (6 ) and a. ここで、gは定数であり、ゲインすなわち白色LEDの輝度レベルから与えられる。 Here, g is a constant, given from the gain i.e. the white LED brightness level.

【0064】今、RGB出力信号として(R 0 ',G 0 ', [0064] Now, as an RGB output signal (R 0 ', G 0' ,
0 ')を与えた場合、求めるべき色修正RGB出力信号(R 0 " ,G 0 " ,B 0 " )は、冷陰極蛍光管照明と冷陰極蛍光管照明+白色LED照明における色度値(三刺激値) If you give B 0 '), the color correction RGB output signal to be obtained (R 0 ", G 0" , B 0 ") , the cold cathode fluorescent tube lighting and the cold cathode fluorescent tube lighting + chromaticity values in the white LED lighting (tristimulus values)
が等しくなる条件 sM(R 0 ',G 0 ',B 0 ') t =N(R 0 " ,G 0 " ,B 0 "t (7) から、 (R 0 " ,G 0 " ,B 0 "t =sN -1 M(R 0 ',G 0 ',B 0 ') t (8) により得ることができる。 Conditions are equal sM (R 0 ', G 0 ', B 0 ') t = N (R 0 ", G 0", B 0 ") from the t (7), (R 0 ", G 0 ", B 0 ") t = sN -1 M (R 0 ', G 0', B 0 ') can be obtained by t (8). ここで、sは、冷陰極蛍光管照明のみの照明条件で冷陰極蛍光管照明+白色LED照明と同等の輝度が得られると仮定した場合の比例定数であり、N -1はNの逆行列である。 Here, s is a proportionality constant when the cold-cathode fluorescent tube lighting + white LED lighting equivalent brightness is assumed to be obtained in lighting conditions of the cold cathode fluorescent tube lighting only, N -1 is the inverse matrix of N it is.

【0065】また、本手法は、白色LEDだけでなく、 [0065] In addition, this method is not only a white LED,
RGBそれぞれのLEDを配置した場合にも有効である。 It is also effective in the case of arranging the respective RGB the LED. 図19は、RGB各色のLEDの発光スペクトル、 19, RGB emission spectrum of each color of the LED,
冷陰極管の発光スペクトル、RGBカラーフィルタの分光透過率を示した図である。 Emission spectrum of the cold-cathode tube, a graph showing the spectral transmittance of the RGB color filters. 本構成においては、各色のLEDの発光強度を独立に制御可能であるので、図20 Since in this arrangement, it is possible to control the light emission intensity of each color LED independently, Figure 20
に示すように、LEDによる白色点を蛍光管の白色点に一致させることは容易である。 As shown in, it is easy to match the white point by LED white point of the fluorescent tube.

【0066】本手法では、中間調表示表示における両照明条件間での色差はあまり大きくないため、図21に示すように、彩度予測色補正判断部41及び彩度補正用L [0066] In this method, since the color difference between the two lighting conditions in the halftone display the display is not so large, as shown in FIG. 21, the chroma prediction color correction determining unit 41 and the chroma correcting L
UT42を設け、一定以上の彩度を持つ信号に対し、簡便な色修正を加味した階調変換処理により、色補償を行うことも可能である。 The UT42 provided to the signal having the saturation constant above, the gradation conversion processing in consideration of the simple color correction, it is possible to perform color compensation. この場合、ある一定の輝度及び彩度を有するRGB信号レベルに対して補償を施すので、 In this case, since the applying compensation to the RGB signal level having a constant luminance and chroma in,
メモリや信号変換回路の簡素化が可能である。 It is possible to simplify the memory and the signal conversion circuit.

【0067】(実施形態2)図22は、本発明の第2の実施形態における主要部の構成を示した図である。 [0067] (Embodiment 2) FIG. 22 is a diagram showing a configuration of a main portion in the second embodiment of the present invention. 本実施形態においては、図23に示すように、バックライト12として冷陰極蛍光管111のみを用いた直下型構造をとり、各冷陰極蛍光管111を隔壁112によって隔てている。 In this embodiment, as shown in FIG. 23, taking a direct type structure as the backlight 12 using only cold cathode fluorescent tube 111, and the respective cold cathode fluorescent tubes 111 spaced by a partition 112. また、図22に示すように、各冷陰極管点灯用のインバータ回路113を独立に複数設け、このインバータ回路113がB/L輝度制御回路114(図3におけるB/L輝度制御回路18に対応)に接続されている。 Further, as shown in FIG. 22, a plurality of inverter circuits 113 of the cold cathode tubes for lighting independently corresponding to B / L brightness control circuit 18 inverter circuit 113 is in the B / L luminance control circuit 114 (FIG. 3 )It is connected to the.

【0068】本実施形態によれば、従来の直下型バックライト構造のLCDに、複数のインバータ回路113 According to [0068] this embodiment, the LCD of a conventional direct-type backlight structure, a plurality of inverter circuits 113
と、図3に示したようなB/L輝度制御回路及び階調変換回路を設けるのみの簡便な構造で、図24に示すように蛍光管配列方向に対して画像輝度情報に応じた照明輝度分布を持たせることが可能となる。 When, a simple structure only provided B / L brightness control circuit and the gradation conversion circuit as shown in FIG. 3, the illumination brightness corresponding to the image luminance information to the fluorescent tube array direction as shown in FIG. 24 it is possible to have a distribution. バックライト構造がほぼ従来と同様の構造のまま使用できること、画面分割数が少ないため輝度レベルの組み合わせに応じた階調補正データが縮小されるなど、回路規模を低減できる効果が得られる。 Can be used backlight structure remains substantially the same as conventional structures, such as tone correction data corresponding to a combination of the brightness level for the screen division number is low is reduced, the effect of reducing the circuit scale is obtained.

【0069】(実施形態3)図25は、本発明の第3の実施形態における主要部の構成を示した図である。 [0069] (Embodiment 3) FIG. 25 is a diagram showing a configuration of a main part in a third embodiment of the present invention. 本実施形態は、バックライト光源に冷陰極管を用いず、白色LED121のみで複数の照明領域を構成したことを特徴とする。 This embodiment does not use the cold cathode tube backlight source, characterized in that to constitute a plurality of illumination areas only white LED 121. 本実施形態では、冷陰極管及びインバータを使用しないので、光源の軽量化及び単純化が図れる。 In the present embodiment does not use a cold cathode tube and an inverter, weight and simplicity of the light source can be achieved.

【0070】図26は、照明領域を隔壁などで仕切らない場合の、画面内におけるLEDの配置、各LEDによる有効照明領域、階調変換処理を受ける画素領域の関係について示した図である。 [0070] Figure 26, when no partitioned illumination zone partitions, etc., arranged in LED in the screen is a diagram showing the relationship between the effective illumination area, and the pixel area to be gradation conversion processing by each LED. 本構成では、輝度を均一化するためにLEDを稠密に配置している。 In this configuration, it is densely arranged an LED in order to equalize the luminance. このような構成では、実施形態1のような明確な照明領域は存在しないため、各LEDに対応した複数の有効照明領域が輝度レベル選択の基準となる。 In this configuration, the distinct illumination area such as the embodiment 1 does not exist, a plurality of effective illumination area corresponding to each LED is a reference brightness level selected. また、階調補正に対しては、画素領域を支配的に照明する複数のLEDチップにおける輝度レベルの組み合わせに対応した階調補正テーブルを持つ。 Further, for the tone correction, having a tone correction table corresponding to combinations of the brightness levels in a plurality of LED chips which predominantly illuminate the pixel region.

【0071】(実施形態4)図27は、本発明の第4の実施形態におけるバックライト部の構成を模式的に示した図である。 [0071] (Embodiment 4) FIG. 27 is a diagram schematically showing the structure of a backlight unit according to the fourth embodiment of the present invention. 本実施形態は、バックライトをエレクトロルミネッセント(EL)バックライトとLEDで構成したことを特徴とする。 This embodiment is characterized by being configured to backlight electroluminescent (EL) backlight and the LED.

【0072】本実施形態では、図27に示すように、照明領域は4領域に分割されており、EL発光面は直下型としてLCD背面側から照明を行う。 [0072] In this embodiment, as shown in FIG. 27, the illumination region is divided into four regions, EL light emission surface to illuminate the LCD rear side as direct type. 図28に示すように、ELバックライト131は、反射電極層と透明電極層との間にEL発光層を挟んだ構成である。 As shown in FIG. 28, EL backlight 131 has a configuration sandwiching the EL light-emitting layer between the reflective electrode layer and the transparent electrode layer. 反射電極或いは透明電極が照明領域毎に分割されているため、セグメント的に独立して照明が可能である。 Since the reflective electrode or a transparent electrode is divided for each illuminated area, it is possible to illuminate the segment to independently. LED132 LED132
は、ELバックライト131の上面に配置された導光板の端面から照明光を入射するサイドライト型の配置をとっている。 Takes the place of the side light type incident illumination light from the end face of the EL backlight 131 upper surface arranged light guide plate. 導光板には切り欠きを入れるなどして、LE The light guide plate by putting a notch, LE
D照明光の領域毎の独立性を高めるようにしている。 And so as to increase the area per independence of D illumination light. 導光板の切り欠きは、導光板の端面に垂直に入射した光が全反射するように、ジグザグ状になっていることが好ましい。 Notch of the light guide plate, so that light incident perpendicularly on the end face of the light guide plate is totally reflected, it is preferable that has a zigzag shape. このように、本実施形態では、LED132、E Thus, in this embodiment, LED 132, E
Lバックライト131ともに照明領域が分割されており、両者をそれぞれ輝度変調させることが可能な構造になっている。 L backlight 131 and both are illuminated area division has a structure capable of respectively luminance modulation of both.

【0073】以上のような構成をとることで、ELバックライトとLEDの組み合わせにおいても、本発明の効果を奏することができる。 [0073] By taking the above-described configuration, even in a combination of the EL backlight and the LED, it is possible to obtain the effect of the present invention. また、特に図示しないが、E In addition, not particularly shown in the drawings, E
L発光面内にLEDを埋め込んだ構成のバックライトや、冷陰極のリフレクタ部分にELバックライトを配置した構成など、様々な光源を組み合わせて使用することが可能である。 The L-emitting surface in the configuration of a backlight and with embedded LED, a reflector portion of the cold cathode such as configuration of arranging the EL backlight, it is possible to use a combination of various light sources. また、異なる種類の光源のうち、一方の輝度のみを固定して他方の輝度を変調するだけでなく、 Also, among the different types of light sources, not only to fix only one of the intensity modulating the other luminance,
両者ともに輝度変調することで輝度レベルを制御することも可能である。 It is also possible to control the luminance levels by luminance modulation Both.

【0074】以上、本発明の実施形態を説明したが、本発明は上記実施形態に限定されるものではなく、その趣旨を逸脱しない範囲内において種々変形して実施することが可能である。 [0074] Having described the embodiments of the present invention, the present invention is not limited to the above embodiments, it can be implemented in various modifications within a range not departing from its gist. さらに、上記実施形態には種々の段階の発明が含まれており、開示された構成要件を適宜組み合わせることによって種々の発明が抽出され得る。 Furthermore, the embodiments include inventions of various stages, and various inventions can be extracted by combining the disclosed configuration requirements appropriate. 例えば、開示された構成要件からいくつかの構成要件が削除されても、所定の効果が得られるものであれば発明として抽出され得る。 For example, some constituent elements from the disclosed configuration requirements be deleted can be extracted as an invention as long as the desired effects are obtained.

【0075】 [0075]

【発明の効果】本発明によれば、広いダイナミックレンジを有する高品位の画像を表示することが可能となる。 According to the present invention, it is possible to display a high quality image having a wide dynamic range.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の第1の実施形態に係る表示装置本体の構成例を示した図。 Diagram showing a configuration example of a display device main body according to a first embodiment of the present invention; FIG.

【図2】本発明の第1の実施形態における画面及びバックライトの領域分割の一例を示した図。 [Figure 2] Figure 1 shows an example of a region division of the screen and the backlight in the embodiment of the present invention.

【図3】本発明の第1の実施形態に係る表示装置の構成例を示したブロック図。 Block diagram showing a configuration example of a display device according to a first embodiment of the present invention; FIG.

【図4】本発明の第1の実施形態において、バックライトの輝度レベルと、輝度及び階調信号との対応関係を示した図。 In a first embodiment of the present invention; FIG exhibited a luminance level of the backlight, the correspondence between the luminance and the gradation signal FIG.

【図5】本発明の第1の実施形態において、各バックライト輝度レベルにおける、入力RGB信号レベルと画面輝度との関係を示した図。 In a first embodiment of the present invention; FIG, at each backlight luminance level, showing the relationship between the input RGB signal level and screen brightness Fig.

【図6】本発明の第1の実施形態において、入力階調信号R'G'B'と画面輝度との関係を示した図。 In a first embodiment of the invention; FIG, showing the relationship between the input gradation signal R'G'B 'as the screen brightness Fig.

【図7】本発明の第1の実施形態において、入力階調信号R'G'B'とLCD出力用階調信号R”G”B”との関係を示した図。 In a first embodiment of the present invention; FIG, showing the relationship between the input gradation signal R'G'B 'as the gradation signal R "G" B "for the LCD output FIG.

【図8】本発明の第1の実施形態において、画素領域毎に入力信号レベルの平均輝度階調を算出した結果の一例を示した図。 In a first embodiment of the invention; FIG, an example of a result of calculating the average luminance gradation of the input signal level for each pixel region FIG.

【図9】本発明の第1の実施形態におけるバックライト輝度レベルの選択方法について示した図。 Diagram showing the backlight luminance level of the selected method in the first embodiment of the present invention; FIG.

【図10】本発明の第1の実施形態において、バックライト照明領域毎に入力信号レベルの平均輝度階調を算出した結果の一例を示した図。 In a first embodiment of the invention; FIG, an example of a result of calculating the average luminance gradation of the input signal level to the backlight illumination each region FIG.

【図11】本発明の第1の実施形態において、バックライト領域間のクロストークによる照明誤差を示した図。 In the first embodiment of FIG. 11 the present invention, showing the lighting error due to cross-talk between the backlight region FIG.

【図12】本発明の第1の実施形態において、照明誤差に起因する階調誤差の一例について示した図。 In a first embodiment of the present invention; FIG showed an example of a tone error arising in the lighting error FIG.

【図13】本発明の第1の実施形態におけるバックライト部の構造の一例を示した図。 FIG. 13 is a view showing an example of the structure of a backlight unit according to the first embodiment of the present invention.

【図14】本発明の第1の実施形態におけるバックライト部の一例について、その断面構成を示した図。 [14] An example of a backlight unit according to the first embodiment of the present invention, showing the cross-sectional configuration FIG.

【図15】本発明の第1の実施形態におけるバックライトの点灯方法について示した図。 Diagram showing the lighting method of the backlight in the first embodiment of the present invention; FIG.

【図16】本発明の第1の実施形態において、バックライト光源の発光強度分布及びカラーフィルタの透過率特性を示した図。 In the first embodiment of FIG. 16 the present invention, showing a light emitting intensity distribution and the transmittance characteristics of the color filter of the backlight source FIG.

【図17】本発明の第1の実施形態において、白色LE In the first embodiment of FIG. 17 the present invention, white LE
Dの輝度ゲインを変化させた場合の白色点及びRGB色度点を示した図。 It shows the white point and the RGB chromaticity points of varying the brightness gain of the D.

【図18】本発明の第1の実施形態に係る表示装置の変更例を示したブロック図。 Figure 18 is a block diagram showing a modification of a display device according to a first embodiment of the present invention.

【図19】本発明の第1の実施形態において、バックライト光源の発光強度分布及びカラーフィルタの透過率特性を示した図。 In the first embodiment of FIG. 19 the present invention, showing a light emitting intensity distribution and the transmittance characteristics of the color filter of the backlight source FIG.

【図20】本発明の第1の実施形態において、各色LE In the first embodiment of FIG. 20 the present invention, each color LE
Dの発光強度を制御した場合の白色点及びRGB色度点を示した図。 It shows the white point and the RGB chromaticity points in case of controlling the emission intensity of D.

【図21】本発明の第1の実施形態に係る表示装置の変更例を示したブロック図。 Figure 21 is a block diagram showing a modification of a display device according to a first embodiment of the present invention.

【図22】本発明の第2の実施形態におけるバックライトの点灯方法について示した図。 Figure 22 is a diagram illustrating the lighting method of the backlight according to the second embodiment of the present invention.

【図23】本発明の第2の実施形態に係る表示装置本体の構成例を示した図。 Figure 23 is a diagram showing a configuration example of a display device main body according to a second embodiment of the present invention.

【図24】本発明の第2の実施形態におけるバックライトの照明領域を示した図。 It shows the illumination area of ​​the backlight according to the second embodiment of Figure 24 the present invention.

【図25】本発明の第3の実施形態に係る表示装置本体の構成例を示した図。 Figure 25 is a diagram showing a configuration example of a display device main body according to a third embodiment of the present invention.

【図26】本発明の第3の実施形態におけるバックライトの照明領域を示した図。 It shows the illumination area of ​​the backlight according to the third embodiment of FIG. 26 the present invention.

【図27】本発明の第4の実施形態におけるバックライト部の構成を示した図。 [Figure 27] Figure 4 shows the structure of a backlight unit according to an embodiment of the present invention.

【図28】本発明の第4の実施形態におけるバックライト部の断面構成を示した図。 [Figure 28] Figure 4 shows a cross-sectional configuration of a backlight unit according to an embodiment of the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

11…LCD 12…バックライト 13…フレームメモリ 14…画像輝度演算回路 15…画像輝度データ保持部 16…バックライト輝度演算回路 17…バックライト輝度データ保持部 18…バックライト輝度制御回路 19…階調変換回路 20…階調補正用LUT 21…階調補正回路 22…LCDドライバ 31…色度計算回路 32…色補正回路 33…色補正用LUT 34…RGB信号変換回路 41…彩度予測色補正判断部 42…彩度補正用LUT 101、111…冷陰極蛍光管 102、112…隔壁 103,121、132…LED 104、113…インバータ回路 105、114…バックライト輝度制御回路 131…ELバックライト 11 ... LCD 12 ... backlight 13 ... frame memories 14 ... image luminance arithmetic circuit 15 ... image luminance data holding unit 16 ... backlight luminance calculating circuit 17 ... backlight luminance data holding unit 18 ... backlight brightness control circuit 19 ... gradation conversion circuit 20 ... gradation correction LUT 21 ... gradation correction circuit 22 ... LCD driver 31 ... chromaticity calculating circuit 32 ... color correction circuit 33 ... color correction LUT 34 ... RGB signal conversion circuit 41 ... chroma prediction color correction determination part 42 ... chroma correction LUT 101, 111 ... cold cathode fluorescent tubes 102, 112 ... partition wall 103,121,132 ... LED 104,113 ... inverter circuit 105,114 ... backlight luminance control circuit 131 ... EL backlight

フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) G09F 9/00 337 G09G 3/20 642J G09G 3/20 642 642B G02F 1/1335 530 Fターム(参考) 2H091 FA42Z FA44Z FA45Z FD22 GA11 LA17 2H093 NA52 NC29 NC42 NC49 NC59 NC62 ND04 ND07 NE06 NH18 5C006 AA16 AA22 AF13 AF44 AF46 AF51 AF53 AF63 AF85 BB11 BF02 EA01 FA18 FA22 FA56 5C080 AA10 BB05 CC03 DD05 EE29 EE30 JJ02 JJ05 JJ06 JJ07 5G435 AA02 AA04 BB12 BB15 CC09 CC12 EE26 EE27 EE29 EE30 FF03 FF13 GG23 GG24 GG25 GG26 GG27 Of the front page Continued (51) Int.Cl. 7 identification mark FI theme Court Bu (Reference) G09F 9/00 337 G09G 3/20 642J G09G 3/20 642 642B G02F 1/1335 530 F -term (reference) 2H091 FA42Z FA44Z FA45Z FD22 GA11 LA17 2H093 NA52 NC29 NC42 NC49 NC59 NC62 ND04 ND07 NE06 NH18 5C006 AA16 AA22 AF13 AF44 AF46 AF51 AF53 AF63 AF85 BB11 BF02 EA01 FA18 FA22 FA56 5C080 AA10 BB05 CC03 DD05 EE29 EE30 JJ02 JJ05 JJ06 JJ07 5G435 AA02 AA04 BB12 BB15 CC09 CC12 EE26 EE27 EE29 EE30 FF03 FF13 GG23 GG24 GG25 GG26 GG27

Claims (5)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】画像表示部と、 前記画像表示部内を照明する複数の照明領域を有する照明部と、 入力画像信号に基づいて前記照明部の各照明領域の輝度を制御する照明輝度制御部と、 前記照明輝度制御部で得られる前記照明部の各照明領域に対する輝度情報に基づいて前記入力画像信号を変換し、変換された画像信号を前記画像表示部に向けて供給する画像信号変換部と、 を備えたことを特徴とする表示装置。 And 1. A image display unit, a lighting unit having a plurality of illumination areas for illuminating said image display portion, an illumination luminance control unit that controls the luminance of each illumination area of ​​the illumination unit based on an input image signal the illumination converts the input image signal based on the luminance information of each illumination area of ​​the illumination unit obtained by the brightness control unit, and an image signal conversion unit for supplying the converted image signals toward the image display unit a display device characterized by comprising a.
  2. 【請求項2】前記画像信号変換部は、前記輝度情報に基づいて前記入力画像信号の階調を変換する機能を有することを特徴とする請求項1に記載の表示装置。 Wherein said image signal converting unit, a display device according to claim 1, characterized in that it has a function of converting the gradation of the input image signal based on the luminance information.
  3. 【請求項3】前記照明部は、発光原理が互いに異なる複数種類の発光素子を用いて構成されていることを特徴とする請求項1又は2に記載の表示装置。 Wherein the illumination unit includes a display device according to claim 1 or 2, characterized in that the light-emitting principle is constituted by using a different types of light-emitting elements to each other.
  4. 【請求項4】前記複数種類の発光素子の発光色の違いに応じた色補償を行う色補償部を備えたことを特徴とする請求項3に記載の表示装置。 4. A display device according to claim 3, further comprising a color compensation unit that performs color compensation according to the difference in emission colors of the plurality of types of light emitting elements.
  5. 【請求項5】前記照明部の各照明領域は、隔壁によって分割されていることを特徴とする請求項1又は2に記載の表示装置。 Each illumination region wherein said illumination unit, a display device according to claim 1 or 2, characterized in that it is divided by a partition wall.
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