JP2004287420A - Display method, display control unit, and display device - Google Patents

Display method, display control unit, and display device Download PDF

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JP2004287420A
JP2004287420A JP2004060121A JP2004060121A JP2004287420A JP 2004287420 A JP2004287420 A JP 2004287420A JP 2004060121 A JP2004060121 A JP 2004060121A JP 2004060121 A JP2004060121 A JP 2004060121A JP 2004287420 A JP2004287420 A JP 2004287420A
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video signal
light source
display device
display
timing
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JP4559099B2 (en
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Ryota Hata
亮太 畑
Atsushi Ikeda
淳 池田
Shuichi Oshima
修一 尾島
Takeshi Hirashima
毅 平島
Shinya Kiuchi
真也 木内
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve display quality. <P>SOLUTION: A display device is equipped with: a video signal analyzing means 100; a video signal adjusting means 101 of receiving and adjusting a video signal according to adjustment parameters and outputting the adjusted video signal to a display device 103; and a light source control means 102 of outputting a light source control signal to a light source 104 in accordance with light source light emission quantity information. The video signal adjusting means synchronizes the timing where the display device displays a picture by using the video signal adjusted by the video signal adjusting means with the timing where the light source varies light emission quantity with the light source control signal of the light source control means. Then this display device makes the relation between those timing points always proper to deter picture quality from becoming worse owing to the light/shade switching etc. of the light source, thereby making video display of high quality. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、表示方法、表示制御装置及び表示装置に係り、より特定的には、液晶パネルに代表される受光型表示デバイスへ、光源から光を照射して映像を表示する映像表示装置において、入力する映像データに応じて、動的に映像信号の調整及び、光源の輝度調整を行う技術に関するものである。   The present invention relates to a display method, a display control device, and a display device, and more specifically, to a light-receiving display device represented by a liquid crystal panel, a video display device that radiates light from a light source to display a video, The present invention relates to a technique for dynamically adjusting a video signal and adjusting a luminance of a light source according to input video data.

従来、光源の消費電力削減、デバイスの長寿命等を目的として、入力映像信号、光センサ、温度センサ等に応じて、映像信号の調整値と光源の輝度調整値とを相関を持たせて制御し、省電力・長寿命等を実現しようとしている。この技術に関する従来技術として、特許文献１をあげることができる。   Conventionally, the adjustment value of the video signal and the brightness adjustment value of the light source are controlled in correlation with the input video signal, optical sensor, temperature sensor, etc. for the purpose of reducing the power consumption of the light source and extending the life of the device. In addition, they are trying to realize power saving and long life. Patent Document 1 can be cited as a conventional technique relating to this technique.

しかしながら、従来技術によると、調整された映像信号を表示デバイスに表示することと、輝度調整された値に光源を切替えることとは、時間的に全く関連なく実施されていた。   However, according to the related art, displaying the adjusted video signal on the display device and switching the light source to the brightness-adjusted value have been performed irrespective of time.

したがって、せっかく表示デバイスに印加する映像信号を緻密に調整しても、映像信号と光源の発光量とのバランスが崩れやすかった。即ち、従来技術によると、画面が不鮮明になったり、光源の明暗切り替えが目立つ等、良好な表示結果が得られないことがあった。
特開平５−６６５０１号公報 Therefore, even if the video signal applied to the display device is finely adjusted, the balance between the video signal and the light emission amount of the light source is easily lost. That is, according to the related art, a good display result may not be obtained, for example, the screen becomes unclear or the light / dark switching of the light source is conspicuous.
JP-A-5-66501

そこで本発明は、表示品位を向上できる表示方法及びその関連技術を提供することを目的とする。   Therefore, an object of the present invention is to provide a display method capable of improving display quality and related technology.

請求項１記載の表示方法は、映像信号に基づいて表示を行う表示デバイスと、光源制御信号に基づいて、表示デバイスに光を照射する光源とを使用する表示方法であって、表示デバイスが映像を表示するタイミングと、光源が発光量を変更するタイミングとを、同期させる。   The display method according to claim 1, wherein the display device uses a display device that performs display based on a video signal and a light source that irradiates light to the display device based on a light source control signal. Is synchronized with the timing at which the light source changes the light emission amount.

この構成において、表示デバイスが映像を表示するタイミングと、光源の発光量を変更するタイミングのずれをなくすことにより、このずれに起因する画質劣化を抑制できる。したがって、それだけ、高品位な表示結果を得ることができる。   In this configuration, by eliminating the difference between the timing at which the display device displays an image and the timing at which the light emission amount of the light source is changed, it is possible to suppress image quality degradation due to this difference. Therefore, a high-quality display result can be obtained accordingly.

請求項２記載の表示方法では、光源が発光量を変更するタイミングと、表示デバイスが画面の半分を更新するタイミングとを、一致させる。   In the display method according to the second aspect, the timing at which the light source changes the light emission amount and the timing at which the display device updates half of the screen are matched.

この構成により、表示デバイスの表示と、光源の発光量とが、常に適切な関係となり、表示品位を向上できる。   With this configuration, the display of the display device and the light emission amount of the light source always have an appropriate relationship, and the display quality can be improved.

請求項３記載の表示方法では、表示デバイスのＶｓｙｎｃ信号に基づいて同期をとる。   In the display method according to the third aspect, synchronization is established based on the Vsync signal of the display device.

この構成により、Ｖｓｙｎｃ信号に応じたタイミング制御が可能となる。   With this configuration, timing control according to the Vsync signal can be performed.

請求項４記載の表示方法では、表示デバイスへ映像信号の転送時間及び／又は表示デバイスの応答時間に基づいて、同期をとるタイミングを調整する。   In the display method according to the fourth aspect, the synchronization timing is adjusted based on the transfer time of the video signal to the display device and / or the response time of the display device.

請求項５記載の表示方法では、温度センサにより温度情報を検出し、検出した温度情報に基づいて、同期をとるタイミングを調整する。   In the display method according to the fifth aspect, the temperature information is detected by the temperature sensor, and the synchronization timing is adjusted based on the detected temperature information.

これらの構成において、上述した調整によって、同期の精度をさらに高めて、表示品位を向上できる。   In these configurations, the above-described adjustment can further improve synchronization accuracy and improve display quality.

請求項６記載の表示方法では、映像信号の特徴量を抽出するステップを含み、特徴量に基づいて、表示デバイスが映像を表示するタイミングと、光源が発光量を変更するタイミングとを、同期させる。   The display method according to claim 6, further comprising the step of extracting a characteristic amount of the video signal, and synchronizing a timing at which the display device displays an image and a timing at which the light source changes the light emission amount based on the characteristic amount. .

この構成により、映像信号の特徴量に応じたタイミング制御が可能となる。   With this configuration, timing control according to the feature amount of the video signal can be performed.

本発明によれば、表示デバイスが映像を表示するタイミングと、光源の発光量を変更するタイミングのずれをなくし、画質劣化を抑制して、良好な表示結果を得ることができる。   According to the present invention, it is possible to eliminate a difference between a timing at which a display device displays an image and a timing at which a light emission amount of a light source is changed, suppress deterioration in image quality, and obtain a favorable display result.

また、Ｖｓｙｎｃ信号を利用したり、さらなる調整を行って、同期を精密にとり、それだけ表示品位を向上できる。   In addition, the use of the Vsync signal or further adjustment is performed to precisely synchronize, thereby improving the display quality.

以下、図面を参照しながら、本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１は、本発明の実施の形態１における表示装置のブロック図である。図１に示すように、この表示装置は、表示制御装置１０と、表示デバイス１０３及びその光源１０４により構成される。 (Embodiment 1)
FIG. 1 is a block diagram of a display device according to Embodiment 1 of the present invention. As shown in FIG. 1, the display device includes a display control device 10, a display device 103, and a light source 104 thereof.

即ち、この表示装置は、受光型であり、表示デバイス１０３は、典型的には、液晶パネルなどである。さらに、この表示装置には、液晶モニタ、液晶テレビ、液晶プロジェクタ、液晶リアプロジェクタ等も含まれる。   That is, the display device is of a light receiving type, and the display device 103 is typically a liquid crystal panel or the like. Further, the display device includes a liquid crystal monitor, a liquid crystal television, a liquid crystal projector, a liquid crystal rear projector, and the like.

さて、図１に示すように、表示制御装置１０は、次の要素を有する。まず、映像信号解析手段１００は、映像信号を入力してこれを解析する。そして、映像信号調整手段１０１に、調整パラメータを出力し、光源制御手段１０２に、光源発光量を出力する。   Now, as shown in FIG. 1, the display control device 10 has the following elements. First, the video signal analysis means 100 receives and analyzes a video signal. Then, the adjustment parameter is output to the video signal adjustment unit 101, and the light source emission amount is output to the light source control unit 102.

本形態では、映像信号解析手段１００は、ローパスフィルタ又はヒストグラムを用いて、入力映像信号の最大輝度を、映像の特徴量として抽出し、特徴量に基づいて調整パラメータを定める。なお、映像信号解析手段１００は、光源１０４の発光量と関係付けるべき、他の明るさの指標を、映像の特徴量とするようにしても良い。なお、入力映像信号の最大輝度を抽出するには、最大輝度を抽出できる限り任意に選択できる。   In the present embodiment, the video signal analysis unit 100 extracts the maximum luminance of the input video signal as a video feature using a low-pass filter or a histogram, and determines an adjustment parameter based on the feature. Note that the video signal analyzing means 100 may use another index of brightness, which should be related to the light emission amount of the light source 104, as the video feature amount. Note that the maximum luminance of the input video signal can be arbitrarily selected as long as the maximum luminance can be extracted.

映像信号調整手段１０１は、映像信号を入力し、映像信号解析手段１００から入力する調整パラメータ情報にしたがって映像信号を調整し、表示デバイス１０３に調整後の映像信号を出力する。   The video signal adjustment unit 101 receives the video signal, adjusts the video signal according to the adjustment parameter information input from the video signal analysis unit 100, and outputs the adjusted video signal to the display device 103.

光源制御手段１０２は、映像信号解析手段１０１から入力する光源発光量にしたがって光源制御信号を生成し、これを光源１０４に出力する。   The light source control unit 102 generates a light source control signal according to the light source light emission amount input from the video signal analysis unit 101, and outputs this to the light source 104.

図１の構成により、入力映像信号に応じた、映像信号の調整と、光源１０４の発光量を切替えとの、タイミング制御を行う。   With the configuration of FIG. 1, timing control for adjusting the video signal and switching the light emission amount of the light source 104 according to the input video signal is performed.

即ち、映像信号解析手段１００は、パルス発生器１１が発生する一定のパルスに基づいて、映像信号調整手段１０１の調整後の映像信号により、表示デバイス１０３が映像を表示するタイミングと、光源制御手段１０２の光源制御信号により光源１０４が発光量を変更するタイミングとを、同期させる。   That is, the video signal analyzing means 100 determines the timing at which the display device 103 displays a video based on the video signal adjusted by the video signal adjusting means 101 based on the constant pulse generated by the pulse generator 11, The timing at which the light source 104 changes the amount of light emission by the light source control signal 102 is synchronized.

ところで、光源１０４と表示デバイス１０３の映像表示とを、調整する際、例えば、入力された映像信号の最大輝度値が８０％であるとき、従来技術では、光源の発光量を１００％とし、表示デバイスの透過率を８０％として、表示していた。   By the way, when adjusting the light source 104 and the video display of the display device 103, for example, when the maximum luminance value of the input video signal is 80%, in the related art, the light emission amount of the light source is set to 100% and the display is performed. The display is made on the assumption that the transmittance of the device is 80%.

しかしながら、本形態の表示装置は、基本的に、入力された映像信号の最大輝度に応じて、光源１０４の発光量を調整し、調整された発光量に合わせて、表示デバイス１０３の透過率を調整するものである。本形態の表示装置では、例えば、入力された映像信号の最大輝度値が８０％であるとき、光源１０４の発光量を８０％とし、表示デバイス１０３の透過率を１００％とする。   However, the display device of the present embodiment basically adjusts the light emission amount of the light source 104 according to the maximum luminance of the input video signal, and adjusts the transmittance of the display device 103 in accordance with the adjusted light emission amount. It is to adjust. In the display device of this embodiment, for example, when the maximum luminance value of the input video signal is 80%, the light emission amount of the light source 104 is set to 80%, and the transmittance of the display device 103 is set to 100%.

こうすると、光源１０４の発光量を抑えて消費電力を抑制しながら、良好な表示結果が得られる。   In this case, good display results can be obtained while suppressing the light emission amount of the light source 104 and suppressing the power consumption.

さらに、本形態では、上述の２つのタイミングの同期をとることにより、表示品位を、向上させるものである。より詳しくは、映像信号解析手段１００は、光源１０４が発光量を変更するタイミングと、表示デバイス１０３が画面の半分を更新するタイミングとを、一致させる。   Further, in the present embodiment, the display quality is improved by synchronizing the above two timings. More specifically, the video signal analysis unit 100 matches the timing at which the light source 104 changes the light emission amount with the timing at which the display device 103 updates half of the screen.

次に、図２を用いて、このタイミングの関係について、説明する。図２に示すように、表示デバイス１０３の映像が、ライン単位で更新される場合、表示デバイス１０３において、上から下へ映像が更新されてゆき、１画面（フレーム）分の表示が終了すると、次の映像が上から更新される。なお、表示デバイス１０３の映像が、画素単位で更新されるときは、左上から右下へ映像が更新される。   Next, this timing relationship will be described with reference to FIG. As shown in FIG. 2, when the image of the display device 103 is updated in units of lines, the image is updated from top to bottom on the display device 103, and when the display of one screen (frame) is completed, The next video is updated from above. When the image of the display device 103 is updated in pixel units, the image is updated from the upper left to the lower right.

したがって、フレームＮが、表示デバイス１０３に表示される場合、Ｎ−１フレームからＮフレームの更新が開始されて終了する間のちょうど中間で、Ｎフレームに対応する発光量に、光源１０４の発光量を切り替えるとよい。   Therefore, when the frame N is displayed on the display device 103, the light emission amount of the light source 104 is changed to the light emission amount corresponding to the N frame just in the middle between the start and the end of the update of the N frame from the N-1 frame. It is good to switch.

この切替の後、次のＮ＋１フレームが更新されて終了する間のちょうど中間まで、Ｎフレームに対応する発光量で光源１０４を発光させる。   After this switching, the light source 104 is caused to emit light at the light emission amount corresponding to the N frame until just halfway between the end and the update of the next N + 1 frame.

これにより、表示デバイス１０３への映像信号の表示と、光源１０４の発光量切替とが、常に適切な関係を維持することとなり、高品位な映像表示を提供できる。   Accordingly, the display of the video signal on the display device 103 and the switching of the light emission amount of the light source 104 always maintain an appropriate relationship, and a high-quality video display can be provided.

なお、光源１０４が発光量を更新するタイミングは、表示デバイス１０３が画面の半分を更新するタイミングでなくとも、画面と発光量とが適切な関係となる範囲で種々変更して差し支えない。   The timing at which the light source 104 updates the light emission amount may be variously changed as long as the display device 103 does not update the half of the screen as long as the screen and the light emission amount have an appropriate relationship.

（実施の形態２）
次に、図３から図６を用いて、実施の形態２について説明する。まず、実施の形態２は、基本的には、実施の形態１の考え方を踏襲する。そして、実施の形態２は、Ｖｓｙｎｃ信号やその他の調整により、さらに、表示デバイス１０３が映像を表示するタイミングと、光源１０４が発光量を変更するタイミングとの、同期の精度を高めるものである。 (Embodiment 2)
Next, a second embodiment will be described with reference to FIGS. First, the second embodiment basically follows the concept of the first embodiment. In the second embodiment, the synchronization accuracy between the timing at which the display device 103 displays an image and the timing at which the light source 104 changes the light emission amount is further improved by the Vsync signal and other adjustments.

図３は、本発明の実施の形態２における表示装置のブロック図である。以下、実施の形態１との相違点を中心に説明する。   FIG. 3 is a block diagram of a display device according to Embodiment 2 of the present invention. The following description focuses on the differences from the first embodiment.

ここで、実施の形態２における、表示制御装置２０は、図１の要素の他、映像信号入力手段１０５と、温度センサ１０６とを、有する。   Here, the display control device 20 according to the second embodiment includes a video signal input unit 105 and a temperature sensor 106 in addition to the elements shown in FIG.

温度センサ１０６は、環境温度を検出し、温度情報を映像信号解析手段１００へ出力する。   The temperature sensor 106 detects the environmental temperature and outputs temperature information to the video signal analyzing means 100.

映像信号入力手段１０５は、入力映像信号を映像調整手段１０１と、映像信号解析手段１００とに出力する。   The video signal input unit 105 outputs an input video signal to the video adjustment unit 101 and the video signal analysis unit 100.

また、映像信号入力手段１０５は、表示デバイス１０３に接続され、表示デバイス１０３から、Ｖｓｙｎｃ信号を入力し、これを、光源制御手段１０２に出力する。   The video signal input unit 105 is connected to the display device 103, inputs a Vsync signal from the display device 103, and outputs the Vsync signal to the light source control unit 102.

表示デバイス１０３が映像を表示するタイミングと、光源が発光量を変更するタイミングとの、映像信号解析手段１００における同期の取り方が、実施の形態１と異なる。即ち、映像信号解析手段１００は、表示デバイス１０３のＶｓｙｎｃ信号に基づいて同期をとる。   The method of synchronizing the timing at which the display device 103 displays an image and the timing at which the light source changes the light emission amount in the video signal analyzing means 100 is different from that of the first embodiment. That is, the video signal analysis unit 100 synchronizes based on the Vsync signal of the display device 103.

また、映像信号解析手段１００は、映像信号調整手段１０１から表示デバイス１０３へ映像信号の転送時間と表示デバイス１０３の応答時間とに基づいて、同期をとるタイミングを調整する。   In addition, the video signal analysis unit 100 adjusts the synchronization timing based on the transfer time of the video signal from the video signal adjustment unit 101 to the display device 103 and the response time of the display device 103.

次に、具体例を挙げながら、さらに詳しく説明する。以下の例では、表示デバイス１０３が液晶パネルであるものとする。   Next, a more detailed description will be given with reference to specific examples. In the following example, it is assumed that the display device 103 is a liquid crystal panel.

（例１）
図４を用いて、例１を説明する。図４に示す例１では、Ｖｓｙｎｃ信号の周期が６０Ｈｚであり、液晶の応答速度が１２．０ｍｓ、映像信号調整手段１０１が表示デバイス１０３へ映像信号を転送する、転送時間が１０ｍｓ、光源１０４の応答速度が１ｍｓ以下であるものとする。 (Example 1)
Example 1 will be described with reference to FIG. In Example 1 shown in FIG. 4, the cycle of the Vsync signal is 60 Hz, the response speed of the liquid crystal is 12.0 ms, the video signal adjusting unit 101 transfers the video signal to the display device 103, the transfer time is 10 ms, and the light source 104 It is assumed that the response speed is 1 ms or less.

即ち、Ｖｓｙｎｃ信号に同期し、映像信号調整手段１０１から表示デバイス１０３へ、１ライン単位で、映像信号の転送が開始される。そして、最終ラインの転送が完了するまで、１０ｍｓの時間がかかる。   That is, in synchronization with the Vsync signal, the transfer of the video signal from the video signal adjusting unit 101 to the display device 103 is started in units of one line. It takes 10 ms to complete the transfer of the last line.

このとき、表示デバイス１０３の液晶が、各ラインの映像信号を受信した直後から応答を始めると仮定すると、表示デバイス１０３の液晶は、各ラインの映像信号を受信した直後から応答を開始する。１ライン目については、映像信号の転送開始から１２ｍｓに応答が終了する。最終ラインは、１０ｍｓ＋１２ｍｓ＝２２ｍｓ後に応答が終了する。   At this time, assuming that the liquid crystal of the display device 103 starts responding immediately after receiving the video signal of each line, the liquid crystal of the display device 103 starts responding immediately after receiving the video signal of each line. For the first line, the response ends 12 ms from the start of the transfer of the video signal. In the last line, the response ends after 10 ms + 12 ms = 22 ms.

そして、１ライン目の映像信号の転送開始から１ライン目の応答終了の、ちょうど中間から、画面更新が開始され、最終ラインの映像信号の転送開始から最終ラインの応答終了の、ちょうど中間で、画面更新が終了すると、仮定する。   Then, the screen update is started at the middle of the end of the response of the first line from the start of the transfer of the video signal of the first line, and at the middle of the end of the response of the last line from the start of the transfer of the video signal of the last line. Assume that the screen update is completed.

したがって、このタイミングに合わせて、光源制御手段１０２が、フレームＮの画像に対する発光量で、光源１０４を発光させると良い。   Therefore, it is preferable that the light source control unit 102 causes the light source 104 to emit light with the light emission amount for the image of the frame N in accordance with this timing.

例えば、Ｖｓｙｎｃ信号から、表示デバイス１０３への映像信号の転送が開始されるまでの時間をＲｓとし、表示デバイス１０３への１画面分の映像信号の転送時間をＲｔとし、液晶の応答速度をＬＣｔとすると、フレームＮの画像に対する、光源１０４の発光量を切り替えるタイミングＴｎは、
Ｔｎ＝Ｒｓ＋ＬＣｔ／２＋Ｒｔ／２
である。 For example, the time from the Vsync signal to the start of the transfer of the video signal to the display device 103 is Rs, the transfer time of the video signal for one screen to the display device 103 is Rt, and the response speed of the liquid crystal is LCt. Then, the timing Tn for switching the light emission amount of the light source 104 with respect to the image of the frame N is
Tn = Rs + LCt / 2 + Rt / 2
It is.

ここで、Ｒｓ＝２ｍｓ、ＬＣｔ＝１２ｍｓ、Ｒｔ＝１０ｍｓならば、Ｖｓｙｎｃ信号からＴｎ（＝１３ｍｓ）後に、映像信号解析手段１００は、光源制御手段１０２が、光源１０４の発光量を、フレームＮの画像に対応する発光量に切り替えるように、制御する。   Here, if Rs = 2 ms, LCt = 12 ms, and Rt = 10 ms, after Tn (= 13 ms) from the Vsync signal, the video signal analyzing means 100 determines that the light source control means 102 Control is performed so as to switch to the light emission amount corresponding to the image.

なお、表示デバイス１０３の液晶が、各ラインの映像信号の受信から遅延して、応答を開始する場合、その遅延時間を考慮し、タイミングＴｎに遅延時間を加算する。また、画面更新の基準は、画面更新と発光量とが適切な関係となる限りにおいて、種々変更して差し支えない。   Note that, when the liquid crystal of the display device 103 starts a response with a delay from the reception of the video signal of each line, the delay time is added to the timing Tn in consideration of the delay time. Also, the criteria for screen updating may be variously changed as long as the screen updating and the light emission amount have an appropriate relationship.

（例２）
図５を用いて、例２を説明する。図５に示す例２では、光源１０４の応答速度が１ｍｓ以上（例えば４ｍｓ）の場合である。 (Example 2)
Example 2 will be described with reference to FIG. Example 2 shown in FIG. 5 is a case where the response speed of the light source 104 is 1 ms or more (for example, 4 ms).

この場合、図５に示すように、光源１０４の応答が、目標の中間まで到達する時刻を、表示デバイス１０３の画面更新の中間（ＮフレームからＮ＋１フレームの更新が開始されて終了する間のちょうど中間）と一致するように、映像信号解析手段１００は、映像信号調整手段１０１と光源制御手段１０２とを制御する。   In this case, as shown in FIG. 5, the time when the response of the light source 104 reaches the middle of the target is set to the middle of the screen update of the display device 103 (just between the start and end of the update from the N frame to the N + 1 frame). The video signal analysis unit 100 controls the video signal adjustment unit 101 and the light source control unit 102 so as to coincide with (middle).

（例１）または（例２）のようにすると、Ｖｓｙｎｃ信号と、映像信号の表示デバイス１０３への転送と、液晶の応答速度と、光源１０４の応答速度と、表示デバイス１０３への映像信号の表示と、光源１０４の発光量切替とが、常に適切な関係を維持することとなり、高品位な表示結果が得られる。   In the case of (Example 1) or (Example 2), the Vsync signal, the transfer of the video signal to the display device 103, the response speed of the liquid crystal, the response speed of the light source 104, and the transfer of the video signal to the display device 103 The display and the switching of the light emission amount of the light source 104 always maintain an appropriate relationship, and a high-quality display result can be obtained.

ところで、応答時間に対する液晶のねじれが、図６（ａ）に示すように、線形の特性を持つことは、一般にまれである。   By the way, it is rare that the twist of the liquid crystal with respect to the response time has a linear characteristic as shown in FIG.

むしろ、実際には、図６（ｂ）に示すように、非線形の特性であることが多い。いずれにしても、液晶のねじれが、目標の半分に達する時刻に合わせて、タイミングを制御すると良い。   Rather, they often have nonlinear characteristics in practice, as shown in FIG. In any case, the timing should be controlled according to the time when the twist of the liquid crystal reaches half of the target.

さらに、このタイミングの制御は、以上の計算により設定した後、さらに、測定を重ねたり、主観評価を行ったりして、微調節することができる。   Further, this timing control can be finely adjusted after setting by the above calculation and further repeating the measurement or performing a subjective evaluation.

なお、表示デバイス１０３からのＶｓｙｎｃ信号が得られないときには、映像信号調整手段１０１が表示デバイス１０３に映像信号を転送するタイミングに合わせて、光源１０４の発光量を切り替えるタイミングを制御するとよい。Ｖｓｙｎｃ信号は、映像信号入力手段１０５、映像信号調整手段１０１、あるいは、図３に示されていない他の要素が発行するようにしてもよい。この場合、表示デバイス１０３の表示は、このＶｓｙｎｃ信号に同期する。   When the Vsync signal from the display device 103 cannot be obtained, the timing of switching the light emission amount of the light source 104 may be controlled in accordance with the timing at which the video signal adjusting unit 101 transfers the video signal to the display device 103. The Vsync signal may be issued by the video signal input unit 105, the video signal adjustment unit 101, or another element not shown in FIG. In this case, the display of the display device 103 is synchronized with the Vsync signal.

また、望ましくは、映像信号入力手段１０５と映像信号調整手段１０１との間に、１画面分のデータを保存できるバッファを設けると良い。このバッファを設けると、画面表示側を遅延させて、上述の同期をとりやすくなる。   Preferably, a buffer capable of storing data for one screen is provided between the video signal input unit 105 and the video signal adjustment unit 101. By providing this buffer, the screen display side is delayed, and the above-mentioned synchronization is easily achieved.

あるいは、このバッファを設けない場合、映像信号解析手段１００がフレームＮに基づいて求めた調整パラメータは、フレームＮ＋１の表示に反映される。したがって、光源１０４は、フレームＮ＋１が表示デバイス１０３に表示されるタイミングにあわせて、映像信号解析手段１００がフレームＮに基づいて求めた光源発光量により、発光する。   Alternatively, when this buffer is not provided, the adjustment parameter obtained by the video signal analyzing means 100 based on the frame N is reflected on the display of the frame N + 1. Therefore, the light source 104 emits light in accordance with the timing at which the frame N + 1 is displayed on the display device 103, based on the light source emission amount obtained based on the frame N by the video signal analyzing unit 100.

さらに、次の調整１及び調整２が実施される。なお、調整１及び調整２の両方を実施することが、同期の精度を高める趣旨において、望ましいが、これらの一方又は双方を省略することもできる。   Further, the following adjustment 1 and adjustment 2 are performed. Note that it is desirable to perform both the adjustment 1 and the adjustment 2 for the purpose of increasing the synchronization accuracy, but one or both of these may be omitted.

（調整１）映像信号の遷移を考慮して、映像信号解析手段１００は、映像信号調整手段１０１から表示デバイス１０３へ映像信号の転送時間と表示デバイス１０３の応答時間とに基づいて、同期をとるタイミングを調整する。   (Adjustment 1) In consideration of the transition of the video signal, the video signal analysis unit 100 synchronizes based on the transfer time of the video signal from the video signal adjustment unit 101 to the display device 103 and the response time of the display device 103. Adjust the timing.

液晶の応答速度は、現在表示している映像信号値と、次に表示されるべき映像信号値と、あるいは、これらの映像信号値の差の大小等によって、変化する。   The response speed of the liquid crystal changes depending on the video signal value currently displayed, the video signal value to be displayed next, or the magnitude of the difference between these video signal values.

例えば、遷移１「黒（Ｒ：Ｇ：Ｂ＝０：０：０）から白（Ｒ：Ｇ：Ｂ＝２５５：２５５：２５５）」と、遷移２「暗いグレー（Ｒ：Ｇ：Ｂ＝１００：１００：１００）から明るいグレー（Ｒ：Ｇ：Ｂ＝１５０：１５０：１５０）」では、応答速度が異なる。   For example, transition 1 “black (R: G: B = 0: 0: 0) to white (R: G: B = 255: 255: 255)” and transition 2 “dark gray (R: G: B = 100) : 100: 100) to light gray (R: G: B = 150: 150: 150) "have different response speeds.

即ち、一般に、遷移１の方が遷移２よりも映像信号の差が大きいが、遷移１の方が遷移２よりも応答速度が速い。   That is, in general, the transition 1 has a larger difference in the video signal than the transition 2, but the transition 1 has a faster response speed than the transition 2.

このような液晶の特性に対応するため、本形態では、映像信号解析手段１００において、入力映像信号の１画面内の最大輝度、最小輝度を抽出する。そして、映像信号解析手段１００は、最大輝度と最小輝度の差と、最大輝度の値及び最小輝度の値とを特徴量として使用し調整パラメータを定めると共に、光源制御手段１０２が光源１０４の発光量を切り替えるタイミングを制御する。   In order to cope with such characteristics of the liquid crystal, in the present embodiment, the video signal analyzing unit 100 extracts the maximum luminance and the minimum luminance in one screen of the input video signal. Then, the video signal analyzing means 100 determines an adjustment parameter using the difference between the maximum luminance and the minimum luminance, the value of the maximum luminance and the value of the minimum luminance as the feature quantity, and the light source control means 102 Control the timing of switching.

（切り替えタイミングを促進する場合）
最大輝度の値が、最大値「２５５」または最小値「０」であるとき、液晶の応答は一般に速い。したがって、このときは、光源１０４の発光量を切り替えるタイミングを、既定のタイミングよりも速く設定する。 (To promote switching timing)
When the value of the maximum luminance is the maximum value “255” or the minimum value “0”, the response of the liquid crystal is generally fast. Therefore, at this time, the timing of switching the light emission amount of the light source 104 is set earlier than the predetermined timing.

（切り替えタイミングを抑制する場合）
また、前フレームＮ−１の最大輝度が非常に小さく、即ち、前フレームＮ−１の画像が非常に暗く、現フレームＮの最大輝度が非常に大きく、即ち、現フレームＮの画像が非常に明るい場合、光源１０４の発光量は、前フレームＮ−１に応じた小さな発光量から現フレームＮに応じた大きな発光量へ切り替えられることになる。この切り替え時に、液晶が応答を完了していないことに起因して、残像が見えることがある。特に、温度が低いと液晶の応答速度が遅くなり、残像が目立ちやすい。したがって、前フレームＮ−１の最大輝度が非常に小さく、現フレームＮの最大輝度が非常に大きい場合、光源１０４の発光量を切り替えるタイミングを、既定のタイミングよりも遅く設定する。 (When suppressing the switching timing)
Also, the maximum luminance of the previous frame N-1 is very small, that is, the image of the previous frame N-1 is very dark, and the maximum luminance of the current frame N is very large, that is, the image of the current frame N is very small. In a bright case, the light emission amount of the light source 104 is switched from a small light emission amount according to the previous frame N-1 to a large light emission amount according to the current frame N. At the time of this switching, an afterimage may be seen due to the liquid crystal not completing the response. In particular, when the temperature is low, the response speed of the liquid crystal becomes slow, and the afterimage is easily conspicuous. Therefore, when the maximum luminance of the previous frame N-1 is very small and the maximum luminance of the current frame N is very large, the timing for switching the light emission amount of the light source 104 is set later than the predetermined timing.

なお、光源１０４の発光量を切り替えるタイミングは、映像信号の遷移パターン（代表的には最大輝度の遷移パターン）と液晶の応答速度との関係に基づいて、設定すると良い。   Note that the timing of switching the light emission amount of the light source 104 may be set based on the relationship between the transition pattern of the video signal (typically, the transition pattern of the maximum luminance) and the response speed of the liquid crystal.

あるいは、光源１０４の発光量を切り替えるタイミングは、最小輝度、最大輝度と最小輝度の差、平均輝度のフレーム間変化、または画面内において視覚的に目立つ一定領域（例えば中央部）の輝度信号の変化等に基づいて、設定しても良い。   Alternatively, the timing at which the light emission amount of the light source 104 is switched may be a minimum luminance, a difference between the maximum luminance and the minimum luminance, a change in average luminance between frames, or a change in a luminance signal in a certain region (for example, a central portion) that is visually noticeable in the screen. It may be set based on the above.

（調整２）映像信号解析手段１００は、温度センサ１０６が検出する温度情報に基づいて、同期をとるタイミングを調整する。   (Adjustment 2) The video signal analysis unit 100 adjusts the synchronization timing based on the temperature information detected by the temperature sensor 106.

さらに、液晶は、環境温度が、０℃、−１０℃、−２０℃と低くなるにつれ、応答速度が遅くなる性質を持つ。   Further, the liquid crystal has such a property that the response speed becomes slower as the environmental temperature becomes lower at 0 ° C., −10 ° C., and −20 ° C.

このような性質に対応するため、温度センサ１０６において、環境温度を計測し温度情報を映像信号解析手段１００へ入力している。これにより、（調整１）と合わせて、環境温度による液晶の特性変化を反映し、さらに精密に、表示デバイス１０３が映像を表示するタイミングと、光源１０４が発光量を変更するタイミングとの、同期をとっている。   In order to cope with such a property, the temperature sensor 106 measures the environmental temperature and inputs the temperature information to the video signal analyzing means 100. This reflects the characteristic change of the liquid crystal due to the environmental temperature together with (adjustment 1), and more precisely synchronizes the timing at which the display device 103 displays an image with the timing at which the light source 104 changes the light emission amount. Has taken.

一般に液晶の応答速度は、温度が低くなると遅くなり、温度が高くなると速くなる。したがって、温度センサ１０６の検出結果が、常温（例えば２０℃）より高いことを示す場合、光源１０４の発光量を切り替えるタイミングをより速く設定し、常温より低いことを示す場合、光源１０４の発光量を切り替えるタイミングをより遅く設定すると良い。   In general, the response speed of the liquid crystal decreases as the temperature decreases, and increases as the temperature increases. Therefore, when the detection result of the temperature sensor 106 indicates that the temperature is higher than the normal temperature (for example, 20 ° C.), the timing of switching the light emission amount of the light source 104 is set earlier. It is better to set the switching timing later.

液晶の応答速度が温度変化に応じてどのように変化するかは、液晶の材料やモード（例えばＴＮモード等）により異なる。したがって、光源１０４の発光量を切り替えるタイミングは、実際に使用される液晶の特性に応じて設定すると良い。   How the response speed of the liquid crystal changes according to the temperature change depends on the material and mode of the liquid crystal (for example, TN mode). Therefore, the timing for switching the light emission amount of the light source 104 is preferably set according to the characteristics of the liquid crystal actually used.

（制御開始時の処理）
制御開始時には、定常時とは異なる処理をするのが望ましい。制御開始直後（例えば１フレーム目）では、光源の発光量を既定値とし、その後（例えば２フレーム目）、光源の発光量を切り替えるタイミング制御を開始すると良い。 (Process at the start of control)
At the start of control, it is desirable to perform processing different from that at the time of steady state. Immediately after the start of control (for example, the first frame), the light emission amount of the light source is set to a default value, and thereafter (for example, the second frame), timing control for switching the light emission amount of the light source may be started.

（制御終了時の処理）
制御終了時には、光源の発光量を既定値に戻す。このとき、映像信号と光源の発光量との相関が失われるため、画質劣化が目立つことがある。したがって、光源の発光量を既定値に戻すタイミングを、制御終了時の映像信号に合わせて調整すると良い。また、画質劣化を抑制するため、徐々に既定値に至る１乃至数フレーム分の表示を、行っても良い。この表示としては、例えば少しずつ明るくなる表示や、少しずつ暗くなる表示などが考えられる。 (Process at the end of control)
At the end of the control, the light emission amount of the light source is returned to the default value. At this time, since the correlation between the video signal and the light emission amount of the light source is lost, the image quality may be noticeably deteriorated. Therefore, it is preferable to adjust the timing of returning the light emission amount of the light source to the default value in accordance with the video signal at the end of the control. Further, in order to suppress image quality deterioration, display for one to several frames gradually reaching a predetermined value may be performed. The display may be, for example, a display that becomes slightly brighter or a display that becomes slightly darker.

なお、実施の形態１、２において、映像信号解析手段１００が、同期をとるようにしたが、同期をとる要素は、映像信号調整手段１０１、光源制御手段１０２、あるいは、図１、図３に示されていない別の要素（例えば、別途設けられる同期制御回路やＣＰＵ等）であってもよい。   In the first and second embodiments, the video signal analyzing unit 100 is configured to synchronize. However, the elements to be synchronized are the video signal adjusting unit 101, the light source control unit 102, or FIGS. It may be another element not shown (for example, a separately provided synchronization control circuit or CPU).

実施の形態１、２は、映像信号の調整値の変化を一定の範囲内に制限したり、光源１０４の輝度調整値の変化を一定の範囲内に制限したりする手法と、組み合わせて実施することもできる。   The first and second embodiments are implemented in combination with a method of restricting a change in an adjustment value of a video signal to a certain range or a method of restricting a change in a luminance adjustment value of the light source 104 to a certain range. You can also.

本発明の表示制御装置は、例えば透過型ＬＣＤ等の表示デバイスの制御分野等において好適に利用できる。   INDUSTRIAL APPLICABILITY The display control device of the present invention can be suitably used, for example, in the field of controlling a display device such as a transmissive LCD.

本発明の実施の形態１における表示装置のブロック図Block diagram of display device in Embodiment 1 of the present invention 同タイムチャートSame time chart 本発明の実施の形態２における表示装置のブロック図Block diagram of a display device according to Embodiment 2 of the present invention. 同タイムチャートSame time chart 同タイムチャートSame time chart （ａ）同液晶のねじれの特性を示すグラフ （ｂ）同液晶のねじれの特性を示すグラフ （ｃ）同液晶のねじれの特性を示すグラフ(A) A graph showing the twist characteristics of the same liquid crystal. (B) A graph showing the twist characteristics of the same liquid crystal. (C) A graph showing the twist characteristics of the same liquid crystal.

符号の説明Explanation of reference numerals

１０、２０ 表示制御装置
１００ 映像信号解析手段
１０１ 映像信号調整手段
１０２ 光源制御手段
１０３ 表示デバイス
１０４ 光源
１０５ 映像信号入力手段 10, 20 display control device 100 video signal analysis means 101 video signal adjustment means 102 light source control means 103 display device 104 light source 105 video signal input means

Claims (12)

映像信号に基づいて表示を行う表示デバイスと、光源制御信号に基づいて、前記表示デバイスに光を照射する光源とを使用する表示方法であって、
前記表示デバイスが映像を表示するタイミングと、前記光源が発光量を変更するタイミングとを、同期させる、表示方法。 A display method that uses a display device that performs display based on a video signal and a light source that irradiates light to the display device based on a light source control signal,
A display method, wherein the timing at which the display device displays an image and the timing at which the light source changes the light emission amount are synchronized. 前記光源が発光量を変更するタイミングと、前記表示デバイスが画面の半分を更新するタイミングとを、一致させる、請求項１記載の表示方法。 The display method according to claim 1, wherein a timing at which the light source changes a light emission amount and a timing at which the display device updates a half of a screen are matched. 前記表示デバイスのＶｓｙｎｃ信号に基づいて同期をとる、請求項１から２記載の表示方法。 The display method according to claim 1, wherein synchronization is performed based on a Vsync signal of the display device. 前記表示デバイスへ映像信号の転送時間及び／又は前記表示デバイスの応答時間に基づいて、同期をとるタイミングを調整する、請求項１から３記載の表示方法。 4. The display method according to claim 1, wherein the synchronization timing is adjusted based on a transfer time of a video signal to the display device and / or a response time of the display device. 温度センサにより温度情報を検出し、検出した温度情報に基づいて、同期をとるタイミングを調整する、請求項１から５記載の表示方法。 The display method according to claim 1, wherein temperature information is detected by a temperature sensor, and a synchronization timing is adjusted based on the detected temperature information. 映像信号の特徴量を抽出するステップを含み、特徴量に基づいて、前記表示デバイスが映像を表示するタイミングと、前記光源が発光量を変更するタイミングとを、同期させる、請求項１から５記載の表示方法。 6. The method according to claim 1, further comprising the step of extracting a feature amount of the video signal, wherein a timing at which the display device displays an image and a timing at which the light source changes a light emission amount are synchronized based on the feature amount. Display method. 映像信号を入力して解析する映像信号解析手段と、
映像信号を入力し、前記映像信号解析手段から入力する調整パラメータ情報にしたがって映像信号を調整し、表示デバイスに調整後の映像信号を出力する映像信号調整手段と、
前記映像信号解析手段から入力する光源発光量情報にしたがって光源制御信号を、光源に出力する光源制御手段とを備え、
前記映像信号解析手段は、前記映像信号調整手段の調整後の映像信号により、表示デバイスが映像を表示するタイミングと、前記光源制御手段の光源制御信号により光源が発光量を変更するタイミングとを、同期させる、表示制御装置。 Video signal analysis means for inputting and analyzing the video signal,
Video signal adjustment means for inputting a video signal, adjusting the video signal according to the adjustment parameter information input from the video signal analysis means, and outputting the adjusted video signal to a display device,
A light source control signal that outputs a light source control signal to the light source according to the light source emission amount information input from the video signal analysis means,
The video signal analysis unit, by the video signal after the adjustment of the video signal adjustment unit, the timing at which a display device displays an image, the timing at which the light source changes the light emission amount by the light source control signal of the light source control unit, Display control unit to synchronize. 前記映像信号解析手段は、光源が発光量を変更するタイミングと、表示デバイスが画面の半分を更新するタイミングとを、一致させる、請求項７記載の表示制御装置。 The display control device according to claim 7, wherein the video signal analysis unit matches the timing at which the light source changes the light emission amount with the timing at which the display device updates half of the screen. 前記映像信号解析手段は、表示デバイスのＶｓｙｎｃ信号に基づいて同期をとる、請求項７から８記載の表示制御装置。 9. The display control device according to claim 7, wherein the video signal analysis unit performs synchronization based on a Vsync signal of a display device. 前記映像信号解析手段は、前記映像信号調整手段から表示デバイスへ映像信号の転送時間及び／又は表示デバイスの応答時間に基づいて、同期をとるタイミングを調整する、請求項７から９記載の表示制御装置。 10. The display control according to claim 7, wherein the video signal analysis unit adjusts synchronization timing based on a transfer time of the video signal from the video signal adjustment unit to a display device and / or a response time of the display device. apparatus. 温度センサを備え、
前記映像信号解析手段は、前記温度センサが検出する温度情報に基づいて、同期をとるタイミングを調整する、請求項７から１０記載の表示制御装置。 Equipped with a temperature sensor,
The display control device according to claim 7, wherein the video signal analysis unit adjusts synchronization timing based on temperature information detected by the temperature sensor. 請求項７から１１記載の表示制御装置と、
前記表示制御装置の前記映像信号調整手段が出力する調整後の映像信号に基づいて表示を行う表示デバイスと、
前記表示制御装置の前記光源制御手段が出力する光源制御信号に基づいて、前記表示デバイスに光を照射する光源とを備える、表示装置。 A display control device according to claim 7,
A display device that performs display based on the adjusted video signal output by the video signal adjustment unit of the display control device,
A display device comprising: a light source configured to irradiate the display device with light based on a light source control signal output by the light source control unit of the display control device.
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