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JP4623947B2 - Display driving method for liquid crystal display device - Google Patents

Display driving method for liquid crystal display device Download PDF

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JP4623947B2
JP4623947B2 JP2003299969A JP2003299969A JP4623947B2 JP 4623947 B2 JP4623947 B2 JP 4623947B2 JP 2003299969 A JP2003299969 A JP 2003299969A JP 2003299969 A JP2003299969 A JP 2003299969A JP 4623947 B2 JP4623947 B2 JP 4623947B2
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liquid crystal
display
light
segment
subframe
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JP2005070421A (en
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智昭 児玉
宜久 岩本
貴 杉山
康夫 都甲
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Sharp Corp
Stanley Electric Co Ltd
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Description

本発明は、フィールドシーケンシャル方式における液晶表示装置の表示駆動方法に関するものである。   The present invention relates to a display driving method of a liquid crystal display device in a field sequential system.

液晶表示装置において、カラーフィルタを有しないモノクロ(単色)液晶セルを用いてカラー表示を行う手法がフィールドシーケンシャル方式の表示駆動方法として提案されている。図5にこのような表示駆動方法の一例を示す。   In a liquid crystal display device, a method of performing color display using a monochrome (single color) liquid crystal cell having no color filter has been proposed as a field sequential display driving method. FIG. 5 shows an example of such a display driving method.

図5に示すものは、液晶表示部の表示パターンがA、B、Cの形状のセグメント1、セグメント2、セグメント3から構成され、光源色にR(赤)、G(緑)、B(青)が用いられた場合を示しており、液晶のオン(ON)、オフ(OFF)により各光源色が液晶を透過して表示されるものである。   In the case shown in FIG. 5, the display pattern of the liquid crystal display unit is composed of segment 1, segment 2, and segment 3 having the shapes of A, B, and C, and the light source colors are R (red), G (green), and B (blue). ) Is used, and each light source color is displayed through the liquid crystal when the liquid crystal is on (ON) or off (OFF).

すなわち、R、G、Bの3色の光源を順次発光させて、該当する光源の発光タイミングに合わせて液晶をオン、オフさせる。これを高速で順次駆動させることで、人間の目にモノクロ液晶でも複数の色が表示されているように表現することができる。   That is, the light sources of three colors R, G, and B are caused to emit light sequentially, and the liquid crystal is turned on and off in accordance with the light emission timing of the corresponding light source. By sequentially driving them at high speed, it can be expressed as a plurality of colors are displayed even on a monochrome liquid crystal by human eyes.

具体的な駆動方法を図5について説明する。Yはイエロー(黄)、Cはシアン、Mはマゼンタ、Wは白を示す。
駆動4a;セグメント1にR、セグメント2にG、セグメント3にBを表示。
駆動4b;セグメント1にY、セグメント2にC、セグメント3にMを表示。
駆動4c;セグメント1にW、セグメント2にC、セグメント3にMを表示。
A specific driving method will be described with reference to FIG. Y represents yellow (yellow), C represents cyan, M represents magenta, and W represents white.
Drive 4a; R for segment 1, G for segment 2, and B for segment 3.
Drive 4b; Y for segment 1, C for segment 2, and M for segment 3.
Drive 4c; W for segment 1, C for segment 2, and M for segment 3.

このような駆動を行うことで、モノクロ液晶においてカラー表示を行うことができるが、上記の方式は発光色以外は高速駆動による加法混色での表示であり、瞬間的に色分離が発生して見えるカラーブレーク現象が発生し易くなる。このため、図6に示す新たな任意色発光によるカラー表示が提案されている(例えば、特許文献1参照。)。これにより、カラーブレーク現象の発生が抑えられ、かつ任意色の表示が容易となっている。   By performing such driving, it is possible to perform color display in a monochrome liquid crystal, but the above method is a display with additive color mixing by high-speed driving except for the emission color, and color separation appears to occur instantaneously. Color break phenomenon is likely to occur. For this reason, color display by new arbitrary color light emission shown in FIG. 6 has been proposed (see, for example, Patent Document 1). As a result, the occurrence of the color break phenomenon is suppressed, and display of an arbitrary color is facilitated.

具体的な駆動方法を図6について説明する。
駆動5a;セグメント1にR、セグメント2にG、セグメント3にBを表示。
駆動5b;セグメント1にY、セグメント2にC、セグメント3にMを表示。
駆動5c;セグメント1にW、セグメント2にC、セグメント3にMを表示。
A specific driving method will be described with reference to FIG.
Drive 5a: R is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.
Drive 5b; Y for segment 1, C for segment 2, and M for segment 3.
Drive 5c; W for segment 1, C for segment 2, and M for segment 3.

ここで、上述の2つの駆動方式は、何れも人間の目が切り替わりを認識できない程度以上の駆動周期で表示を行う必要がある。この人間の目が切り替わりを認識できない駆動周期は約16.5ms程度以上である。繰り返し表示させる周期を1フレームとすると、フレーム内で各表示に該当する図5の駆動方式1ではセグメント、図6の駆動方式2では色をそれぞれサブフレームとして配置する必要がある。
特開2001−108960号公報
Here, in both of the above-described two driving methods, it is necessary to perform display with a driving cycle that is more than the extent that human eyes cannot recognize the switching. The driving cycle in which the human eye cannot recognize the switching is about 16.5 ms or more. Assuming that the cycle for repeated display is one frame, it is necessary to arrange a segment as a subframe in the driving method 1 in FIG. 5 and a color in the driving method 2 in FIG.
JP 2001-108960 A

ところで、上記の駆動方式2においては、通常は各サブフレーム長は固定されるが、光源の各発光色特性により発光パワーは異なる。このため、表示色によって明度差が発生してしまう。   By the way, in the driving method 2 described above, the length of each subframe is usually fixed, but the light emission power differs depending on the light emission color characteristics of the light source. For this reason, a brightness difference will occur depending on the display color.

具体例を挙げると、R、G、Bの各LEDチップが1つのパッケージ内に入ったLED素子を用いる場合、各LED順電流の絶対最大定格は25mAであっても、2色同時点灯時は順電流の絶対最大定格のそれぞれの50%、3色同時点灯時は30%までという制約や、トータル電流での絶対最大定格の順電流を超えてはならないという制約がある。   As a specific example, when using LED elements in which R, G, and B LED chips are contained in one package, even when the absolute maximum rating of each LED forward current is 25 mA, There is a restriction that 50% of the absolute maximum rating of the forward current is 30% at the time of simultaneous lighting of three colors, and that the forward current of the absolute maximum rating at the total current must not be exceeded.

よって、R、G、B各単色での発光では順電流の最大定格が各25mAであっても、R・G(Y)表示、G・B(C)表示、R・B(M)表示といった2色表示の場合は、順電流が各7.5mAということがLED素子の制約として発生する。   Therefore, even when the maximum rating of forward current is 25 mA each for light emission in R, G, B single colors, R • G (Y) display, G • B (C) display, R • B (M) display, etc. In the case of two-color display, a forward current of 7.5 mA is generated as a limitation of the LED element.

このため、単色発光に比べて混色発光は明度が低くなってしまい、コントラスト差が大きくなって、表示品位が低下するということがあった。   For this reason, the light emission of the mixed color light emission is lower than that of the single color light emission, the contrast difference is increased, and the display quality is lowered.

本発明は、上記のような問題点に着目してなされたもので、フィールドシーケンシャル方式の駆動方法において、表示全体のコントラストが向上し、表示品位の低下を抑えた液晶表示装置の表示駆動方法を提供することを目的としている。   The present invention has been made paying attention to the above problems, and in a field sequential driving method, a display driving method for a liquid crystal display device in which the contrast of the entire display is improved and the deterioration of display quality is suppressed. It is intended to provide.

本発明に係る液晶表示装置の表示駆動方法は、異なる発光色の複数のLEDチップが1つのパッケージ内に納められたマルチチップパッケージLED素子であって、前記マルチチップパッケージLED素子は同時点灯を行う前記LEDチップ数に応じて定格電流の変動が生じるマルチチップパッケージLED素子であり、前記マルチチップパッケージLED素子を発光素子として有したバック照明部を液晶セルの背面側に備え、全体制御部により複数の表示色信号順次出力され、前記表示色信号によりLED駆動部は前記複数の発光素子の混色を含む順次発光を行い、かつ前記表示色信号により液晶駆動部は液晶表示部の前記液晶セルのオンオフ動作を行い、かつ前記複数の発光素子の順次発光前記液晶セルのオンオフ動作は同期して行われる液晶表示装置の表示駆動方法であって、前記複数の発光素子と前記液晶セルを繰り返し駆動する周期をフレームとし、前記フレーム内で各発光素子を発光駆動する周期をサブフレームとするとき、前記複数の発光素子と前記液晶セルを繰り返し駆動する周期の1フレーム内で、前記液晶セルの各画素は1回のサブフレーム期間以下の前記バック照明部の光源光透過動作を行い、同時に発光させるLEDチップの数に応じて該LEDチップを発光させる際のサブフレーム長に所定の差を持たせて駆動するようにしたことを特徴とする液晶表示装置の表示駆動方法A display driving method of a liquid crystal display device according to the present invention is a multi-chip package LED element in which a plurality of LED chips of different emission colors are housed in one package, and the multi-chip package LED element performs simultaneous lighting. wherein a multi-chip package LED device variation of the rated current is generated in response to the LED chip number, with a back lighting unit having the multi-chip package LED element as a light-emitting element on the back side of the liquid crystal cell, a plurality by the overall control unit Display color signals are sequentially output , the LED drive unit sequentially emits light including a mixed color of the plurality of light emitting elements by the display color signal, and the liquid crystal drive unit by the display color signal causes the liquid crystal cell of the liquid crystal display unit to perform on-off operation, and sequentially emit light on-off operation of the liquid crystal cell line synchronization of the plurality of light emitting elements Is a display driving method for a liquid crystal display device, the a plurality of light emitting element and the frame cycle for repeatedly driving the liquid crystal cell, when the period for emitting driving each light-emitting element within the frame and subframe, the a plurality of said in one frame period to repeatedly drive the liquid crystal cell and the light emitting element performs source light transmission operation of the back lighting unit in the following sub-frame period of each pixel is one of the liquid crystal cell, LED emit light simultaneously A display driving method for a liquid crystal display device, characterized in that the LED chip is driven with a predetermined difference in the length of the sub-frame when light is emitted from the LED chip according to the number of chips .

また、表示色に応じてサブフレーム長を変えるようにし、更に、表示色の明度差に応じてサブフレーム長の比を順次変化させるようにしたものである。   In addition, the subframe length is changed according to the display color, and the ratio of the subframe length is sequentially changed according to the brightness difference of the display color.

本発明によれば、フィールドシーケンシャル方式の駆動方法において、表示全体のコントラストが向上し、表示品位の低下を抑えることができるという効果がある。   According to the present invention, in the field sequential driving method, there is an effect that the contrast of the entire display is improved and the deterioration of display quality can be suppressed.

以下、本発明の実施例を図面について説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本発明は、前述の図6に示す駆動方式2において、全体の表示コントラストを良くしたものである。駆動方式2では各サブフレームの時間は均等にして表示を行っていたが、本発明では発光色の組み合わせによりフレーム周期は変えることなく、サブフレームの時間を可変にしている。   The present invention improves the overall display contrast in the driving method 2 shown in FIG. In the driving method 2, the time of each subframe is displayed uniformly, but in the present invention, the time of the subframe is made variable without changing the frame period by the combination of the light emission colors.

図1に本発明に係る液晶表示装置の構成を概略的に示す。同図において、1は表示全体を制御する制御部、2、3は液晶駆動部、LED駆動部で、液晶駆動部2は液晶表示部4の液晶(LCD)セル5を駆動し、LED駆動部3は液晶表示部4のR、G、Bの各光源を有したバック照明部6を駆動する。   FIG. 1 schematically shows a configuration of a liquid crystal display device according to the present invention. In the figure, 1 is a control unit for controlling the entire display, 2 and 3 are a liquid crystal drive unit and an LED drive unit, and the liquid crystal drive unit 2 drives a liquid crystal (LCD) cell 5 of the liquid crystal display unit 4 and an LED drive unit. 3 drives a backlight unit 6 having R, G, and B light sources of the liquid crystal display unit 4.

この液晶表示装置は、異なる発光色(ここではR、G、Bの3色)の複数のLED(発光素子)を有したバック照明部6を液晶セル5の背面側に備え、複数の表示色信号を順次出力して上記複数のLEDと液晶セル5を同期させて駆動するもので、3色のLEDと液晶セル5を繰り返し駆動する周期の1フレーム内で、各LEDを駆動するサブフレーム長に所定の差を持たせて駆動するようにしている。   This liquid crystal display device includes a backlight unit 6 having a plurality of LEDs (light emitting elements) of different emission colors (here, three colors of R, G, and B) on the back side of the liquid crystal cell 5, and has a plurality of display colors. A signal is sequentially output to drive the plurality of LEDs and the liquid crystal cell 5 in synchronization. The sub-frame length for driving each LED within one frame of a cycle in which the three color LEDs and the liquid crystal cell 5 are repeatedly driven. Is driven with a predetermined difference.

また、表示色に応じてサブフレーム長を変えるようにし、更に、表示色の明度差に応じてサブフレーム長の比を順次変化させるようにしている。   Further, the subframe length is changed according to the display color, and the ratio of the subframe lengths is sequentially changed according to the brightness difference between the display colors.

具体的な駆動方法を図2について説明する。表示パターンの構成は、図6に示すものと同じである。
駆動1a;セグメント1にR、セグメント2にG、セグメント3にBを表示。
駆動1b;セグメント1にY、セグメント2にG、セグメント3にBを表示。
駆動1c;セグメント1にW、セグメント2にG、セグメント3にBを表示。
A specific driving method will be described with reference to FIG. The configuration of the display pattern is the same as that shown in FIG.
Drive 1a: R is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.
Drive 1b: Y is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.
Drive 1c: W is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.

また、単色発光において、光源のパワー差に合わせて発光させる場合であっても、サブフレームの各周期を随時変動させることで、表示品位を上げることができる。   Further, even in the case of emitting light in accordance with the power difference of the light source in monochromatic light emission, display quality can be improved by changing each period of the subframe as needed.

具体的な駆動方法を図3について説明する。
駆動2a;セグメント1にR、セグメント2にG、セグメント3にBを表示。
駆動2b;セグメント1にW、セグメント2にG、セグメント3にBを表示。
駆動2c;セグメント1にW、セグメント2にG、セグメント3にを表示。
A specific driving method will be described with reference to FIG.
Drive 2a: R is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.
Drive 2b: W is displayed in segment 1, G is displayed in segment 2, and B is displayed in segment 3.
Drive 2c; W for segment 1, G for segment 2, and M for segment 3.

ここで、上述の実施例における確認事例を図4について説明する。同図はセグメント1にW、セグメント2にG、セグメント3にBを表示する場合を示している。
駆動3a;フレーム周期16.5msで、各サブフレームは5.5ms。
駆動3b;フレーム周期16.5msで、各サブフレームはW:G:Bが6.5ms:5.0ms:5.0ms。
Here, a confirmation example in the above-described embodiment will be described with reference to FIG. This figure shows a case where W is displayed for segment 1, G for segment 2, and B for segment 3.
Drive 3a; frame period 16.5 ms, each subframe is 5.5 ms.
Drive 3b; with a frame period of 16.5 ms, W: G: B is 6.5 ms: 5.0 ms: 5.0 ms in each subframe.

駆動3bのように表示色によってサブフレーム長比を切り替えることで、駆動3aよりWの明度が上がり、G、Bの明度が下がり、表示全体のコントラストが向上し、表示品位の低下を抑えることができる。   By switching the subframe length ratio according to the display color as in the drive 3b, the brightness of the W is higher than that of the drive 3a, the brightness of G and B is lowered, the contrast of the entire display is improved, and the deterioration of display quality is suppressed. it can.

このように、表示色にサブフレームの時間を連動させながら駆動することで、各表示のコントラスト差を少なくし、表示品位を上げることができ、認識し易いモノクロ液晶によるカラー表示を実現することができる。   In this way, by driving the display color in conjunction with the time of the subframe, it is possible to reduce the contrast difference of each display, improve the display quality, and realize a color display using monochrome liquid crystal that is easy to recognize. it can.

表1にフレーム周期を16.5msとして同時表示色を3色とした場合の例を示す。フレーム1では、セグメント1にR(5.5ms)、セグメント2にG(5.5ms)、セグメント3にB(5.5ms)を表示し、フレーム2では、セグメント1にW(6.5ms)、セグメント2にG(5.0ms)、セグメント3にB(5.0ms)を表示している。また、フレーム3では、セグメント1にR(5.0ms)、セグメント2にW(6.5ms)、セグメント3にB(5.0ms)を表示し、フレーム4では、セグメント1にY(5.5ms)、セグメント2にW(6.0ms)、セグメント3にB(5.0ms)を表示している。   Table 1 shows an example in which the frame period is 16.5 ms and the simultaneous display colors are three colors. In frame 1, R (5.5 ms) is displayed in segment 1, G (5.5 ms) is displayed in segment 2, B (5.5 ms) is displayed in segment 3, and W (6.5 ms) is displayed in segment 1 in frame 2. , G (5.0 ms) is displayed in segment 2, and B (5.0 ms) is displayed in segment 3. In frame 3, R (5.0 ms) is displayed for segment 1, W (6.5 ms) is displayed for segment 2, B (5.0 ms) is displayed for segment 3, and Y (5. 5 ms), W (6.0 ms) is displayed in segment 2, and B (5.0 ms) is displayed in segment 3.

Figure 0004623947
Figure 0004623947

ここで、上述のサブフレーム長に差を持たせて表示する例について説明する。この場合、基準サブフレーム長を5.5msとしたとき、サブフレーム1:サブフレーム2:サブフレーム3=1:1.3:1.2とするのが望ましい。   Here, an example in which the above-described subframe length is displayed with a difference will be described. In this case, when the reference subframe length is set to 5.5 ms, it is desirable that subframe 1: subframe 2: subframe 3 = 1: 1.3: 1.2.

また、表示色(明度)によりサブフレーム長を変えて表示する場合は、基準サブフレーム長を5.5msとしたとき、R:G:B=1:1:1、W:G:B=1.2:0.9:0.9、W:Y:B=1.1:1.05:0.85とするのが望ましい。 Moreover, when displaying by changing the subframe length by the display color (lightness), when the reference sub Boeuf frame length was 5.5ms, R: G: B = 1: 1: 1, W: G: B = It is desirable that 1.2: 0.9: 0.9 and W: Y: B = 1.1: 1.05: 0.85.

また、同時表示を色の組み合わせを変化させながら行う際、表示色の明度差によりサブフレーム長比を順次変化させ場合の例として、基準サブフレーム長を5.5msとしたとき、R:G:B=1:1:1、W:G:B=1.2:0.9:0.9、G:W:B=0.9:1.2:0.9、Y:W:B=1.05:1.1:0.85とするのが望ましい。 Further, as an example of the case where the subframe length ratio is sequentially changed due to the brightness difference of display colors when simultaneous display is performed while changing the color combination, when the reference subframe length is 5.5 ms, R: G : B = 1: 1: 1, W: G: B = 1.2: 0.9: 0.9, G: W: B = 0.9: 1.2: 0.9, Y: W: B = 1.05: 1.1: 0.85 is desirable.

本発明は、カラー表示を行う情報処理装置や他の電気、電子機器の液晶表示装置に広く利用することができる。   The present invention can be widely used in information processing devices that perform color display and liquid crystal display devices of other electrical and electronic devices.

本発明に係る液晶表示装置の構成を示すブロック図The block diagram which shows the structure of the liquid crystal display device which concerns on this invention 実施例1の駆動方法を示す説明図Explanatory drawing which shows the drive method of Example 1. FIG. 実施例2の駆動方法を示す説明図Explanatory drawing which shows the drive method of Example 2. FIG. 実施例の確認事例を示す説明図Explanatory drawing showing a confirmation example of the example 従来例1の駆動方法を示す説明図Explanatory drawing which shows the drive method of the prior art example 1. 従来例2の駆動方法を示す説明図Explanatory drawing which shows the drive method of the prior art example 2.

符号の説明Explanation of symbols

1 制御部
2 液晶駆動部
3 LED駆動部
4 液晶表示部
5 液晶セル
6 バック照明部
DESCRIPTION OF SYMBOLS 1 Control part 2 Liquid crystal drive part 3 LED drive part 4 Liquid crystal display part 5 Liquid crystal cell 6 Back illumination part

Claims (3)

異なる発光色の複数のLEDチップが1つのパッケージ内に納められたマルチチップパッケージLED素子であって、前記マルチチップパッケージLED素子は同時点灯を行う前記LEDチップ数に応じて定格電流の変動が生じるマルチチップパッケージLED素子であり、前記マルチチップパッケージLED素子を発光素子として有したバック照明部を液晶セルの背面側に備え、全体制御部により複数の表示色信号順次出力され、前記表示色信号によりLED駆動部は前記複数の発光素子の混色を含む順次発光を行い、かつ前記表示色信号により液晶駆動部は液晶表示部の前記液晶セルのオンオフ動作を行い、かつ前記複数の発光素子の順次発光前記液晶セルのオンオフ動作は同期して行われる液晶表示装置の表示駆動方法であって、
前記複数の発光素子と前記液晶セルを繰り返し駆動する周期をフレームとし、前記フレーム内で各発光素子を発光駆動する周期をサブフレームとするとき、前記複数の発光素子と前記液晶セルを繰り返し駆動する周期の1フレーム内で、前記液晶セルの各画素は1回のサブフレーム期間以下の前記バック照明部の光源光透過動作を行い、同時に発光させるLEDチップの数に応じて該LEDチップを発光させる際のサブフレーム長に所定の差を持たせて駆動するようにしたことを特徴とする液晶表示装置の表示駆動方法。
A multi-chip package LED element in which a plurality of LED chips of different emission colors are housed in one package, and the multi-chip package LED element varies in rated current according to the number of LED chips that are simultaneously lit. a multi-chip package LED device, said multi-chip back lighting unit having a package LED element as a light-emitting element provided on the back side of the liquid crystal cell, a plurality of display color signals by the overall control unit are sequentially output, the display color signals Accordingly, the LED driving unit sequentially emits light including a mixed color of the plurality of light emitting elements , and the liquid crystal driving unit performs ON / OFF operation of the liquid crystal cell of the liquid crystal display unit according to the display color signal, and the plurality of light emitting elements sequentially. the on-off operation of the light emitting and the liquid crystal cell a display driving method of a liquid crystal display device are synchronized,
Wherein the plurality of the periods repeatedly driving the light emitting element and the liquid crystal cell and the frame, when the period for emitting driving each light-emitting element within the frame and subframe, repeatedly driving the liquid crystal cell and said plurality of light emitting elements Within one frame of the cycle, each pixel of the liquid crystal cell performs the light source light transmission operation of the back illumination unit for one subframe period or less, and causes the LED chips to emit light according to the number of LED chips that emit light simultaneously. A display drive method for a liquid crystal display device, wherein the subframe length is driven with a predetermined difference.
表示色に応じてサブフレーム長を変えることを特徴とする請求項1記載の液晶表示装置の表示駆動方法。   2. The display driving method for a liquid crystal display device according to claim 1, wherein the subframe length is changed in accordance with the display color. 表示色の明度差に応じてサブフレーム長の比を順次変化させることを特徴とする請求項1記載の液晶表示装置の表示駆動方法。   2. The display driving method for a liquid crystal display device according to claim 1, wherein the ratio of the subframe lengths is sequentially changed in accordance with the brightness difference of display colors.
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KR20070081564A (en) 2006-02-13 2007-08-17 삼성전자주식회사 Backlight assembly and a display device provided with the same
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09274471A (en) * 1996-04-09 1997-10-21 Citizen Watch Co Ltd Display device
JP2000028984A (en) * 1998-07-10 2000-01-28 Fujitsu Ltd Display control method for liquid crystal display device and liquid crystal display device
JP2001108960A (en) * 1999-10-12 2001-04-20 Stanley Electric Co Ltd Color liquid crystal display and electronics using the same
JP2003044007A (en) * 2001-07-27 2003-02-14 Nec Mitsubishi Denki Visual Systems Kk Liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09274471A (en) * 1996-04-09 1997-10-21 Citizen Watch Co Ltd Display device
JP2000028984A (en) * 1998-07-10 2000-01-28 Fujitsu Ltd Display control method for liquid crystal display device and liquid crystal display device
JP2001108960A (en) * 1999-10-12 2001-04-20 Stanley Electric Co Ltd Color liquid crystal display and electronics using the same
JP2003044007A (en) * 2001-07-27 2003-02-14 Nec Mitsubishi Denki Visual Systems Kk Liquid crystal display device

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