JPH09168128A - Common electrode potential adjustment device for liquid crystal television receiver - Google Patents
Common electrode potential adjustment device for liquid crystal television receiverInfo
- Publication number
- JPH09168128A JPH09168128A JP32886495A JP32886495A JPH09168128A JP H09168128 A JPH09168128 A JP H09168128A JP 32886495 A JP32886495 A JP 32886495A JP 32886495 A JP32886495 A JP 32886495A JP H09168128 A JPH09168128 A JP H09168128A
- Authority
- JP
- Japan
- Prior art keywords
- common electrode
- electrode potential
- flicker
- value
- liquid crystal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶テレビの生産
において、画面のチラツキ（フリッカー）が最小となる
ように行なうための共通電極電位調整装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common electrode potential adjusting device for producing a liquid crystal television so as to minimize screen flicker.
【０００２】[0002]
【従来の技術】液晶テレビの共通電極電位を調整する場
合、従来は液晶テレビに白ラスター等の映像信号を映
し、画面のチラツキ（フリッカー）を目視によって判定
し、それが最小となるように共通電極電位を調整してい
た。2. Description of the Related Art Conventionally, when adjusting the common electrode potential of a liquid crystal television, a liquid crystal television displays a video signal such as a white raster, and visually judges the flicker of the screen, and it is common to minimize it. The electrode potential was adjusted.
【０００３】[0003]
【発明が解決しようとする課題】このような目視による
判定では、フリッカーが最小となる調整点付近でフリッ
カーの変化が非常に小さくなるため、調整が困難であ
り、調整の精度が低くなっていた。また液晶テレビのイ
ンチ数が小さいものでは、フリッカーの変化を目視で判
定することが難しく、調整が困難であった。In such visual judgment, the change in flicker becomes very small in the vicinity of the adjustment point where flicker is minimized, so that the adjustment is difficult and the adjustment accuracy is low. . Further, in a liquid crystal television having a small number of inches, it is difficult to visually determine a change in flicker, and adjustment is difficult.
【０００４】本発明は、このような従来の問題点を解決
する為に創案されたものであり、液晶テレビ画面のチラ
ツキ（フリッカー）を測定し、その変化を２次曲線に近
似し、この２次曲線の最小値のｘ座標を演算し、この演
算結果よりフリッカーが最小となる共通電極電位値に調
整することによって、共通電極電位の調整の精度向上及
び時間短縮ができる調整方法を提案するものである。The present invention was devised in order to solve such a conventional problem, and measures the flicker of a liquid crystal television screen and approximates the change to a quadratic curve. An adjustment method is proposed in which the accuracy of adjustment of the common electrode potential can be improved and the time can be shortened by calculating the minimum x-coordinate of the following curve and adjusting it to the common electrode potential value that minimizes flicker based on the calculation result. Is.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記従来技術
の問題を解決する為、共通電極電位の値を一定間隔で変
化させる共通電極電位値コントロール手段と、それぞれ
の共通電極電位値での液晶テレビ画面のフリッカーを電
気信号に変換する光電変換素子と、フリッカーの信号成
分のみを取り出すフィルター回路と、この取り出された
信号の大きさをデジタル値に変換するデジタル変換手段
と、このデジタル値及び上記共通電極電位の値を記憶す
るメモリ手段と、このメモリ手段に取り込まれたデジタ
ル値及び共通電極電位の値から、最小二乗法により２次
曲線への近似を行い、この２次曲線の最小値のｘ座標を
演算する演算手段とを設け、この最小値のｘ座標から液
晶テレビの画面のフリッカーが最小となる共通電極電位
値に調整する。In order to solve the above-mentioned problems of the prior art, the present invention provides a common electrode potential value control means for changing the value of the common electrode potential at regular intervals, and a common electrode potential value control means for each common electrode potential value. A photoelectric conversion element for converting the flicker of a liquid crystal television screen into an electric signal, a filter circuit for extracting only the flicker signal component, a digital conversion means for converting the magnitude of the extracted signal into a digital value, and the digital value and A memory means for storing the value of the common electrode potential, and a digital value and a value of the common electrode potential taken in the memory means are approximated to a quadratic curve by the least square method, and the minimum value of the quadratic curve is obtained. And a calculating means for calculating the x-coordinate of the above, and adjusts from this minimum x-coordinate to the common electrode potential value that minimizes the flicker of the screen of the liquid crystal television.
【０００６】従って、本発明では、液晶テレビ画面のチ
ラツキ（フリッカー）が最小となる共通電極電位値を演
算によって求めるので、共通電極電位の調整の精度向
上、及び大幅な時間短縮が図れる。Therefore, according to the present invention, since the common electrode potential value which minimizes the flicker of the liquid crystal television screen is calculated, the accuracy of the common electrode potential adjustment can be improved and the time can be greatly shortened.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一実施例を添付図
面に基づいて詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.
【０００８】図１は、本発明に係る共通電極電位の調整
方法の一例を示すブロック図である。 同図において８
は、液晶テレビ１との通信によって、液晶テレビ１の共
通電極電位値を変化させることのできる通信コントロー
ル部である。ここで液晶テレビ１の共通電極電位値の可
変範囲は０〜２５５までとする。また、液晶テレビ１に
は映像信号発生器９より黒ラスターが送られ画面に表示
されている。FIG. 1 is a block diagram showing an example of a common electrode potential adjusting method according to the present invention. In FIG.
Is a communication control unit capable of changing the common electrode potential value of the liquid crystal television 1 through communication with the liquid crystal television 1. Here, the variable range of the common electrode potential value of the liquid crystal television 1 is set to 0 to 255. Further, a black raster is sent from the video signal generator 9 to the liquid crystal television 1 and displayed on the screen.
【０００９】まず通信コントロール部８は共通電極電位
を初期値、例えば０にし、この値はメモリ６に格納され
る。その後液晶テレビ１の画面のチラツキ（フリッカ
ー）は光電変換素子２によって感知され電気信号に変換
されてフィルター回路３に送られる。フィルター回路３
は、液晶テレビ１の画面のフリッカーが６０Ｈｚである
とすると、６０Ｈｚのバンドパスフィルター回路であ
り、フリッカーの電気信号成分のみ、つまり６０Ｈｚの
正弦波が実効値ＤＣ変換器４に送られる。実効値ＤＣ変
換器４では、フィルター回路３からの６０Ｈｚの正弦波
信号の実効値をＤＣに変換してＡ／Ｄ変換器５に送られ
る。Ａ／Ｄ変換器５では実効値ＤＣ変換器４からのアナ
ログ信号がデジタル信号に変換され、このデジタル信号
はメモリ６に格納される。つまりこのメモリ６に格納さ
れたデジタル信号データは共通電極電位値が０の時の液
晶テレビ画面のフリッカーの大きさの値である。この時
点でメモリ６には共通電極電位値０とその時のフリッカ
ーの大きさの値が格納されている。First, the communication control unit 8 sets the common electrode potential to an initial value, for example, 0, and this value is stored in the memory 6. After that, flicker on the screen of the liquid crystal television 1 is detected by the photoelectric conversion element 2, converted into an electric signal, and sent to the filter circuit 3. Filter circuit 3
If the flicker of the screen of the liquid crystal television 1 is 60 Hz, it is a bandpass filter circuit of 60 Hz, and only the electric signal component of the flicker, that is, a sine wave of 60 Hz is sent to the effective value DC converter 4. The effective value DC converter 4 converts the effective value of the 60 Hz sine wave signal from the filter circuit 3 into DC and sends it to the A / D converter 5. In the A / D converter 5, the analog signal from the effective value DC converter 4 is converted into a digital signal, and this digital signal is stored in the memory 6. That is, the digital signal data stored in the memory 6 is the value of the flicker size of the liquid crystal television screen when the common electrode potential value is zero. At this time, the common electrode potential value 0 and the value of the magnitude of flicker at that time are stored in the memory 6.
【００１０】その後通信コントロール部８は共通電極電
位値を一定間隔、例えば１５ごとに上げていき、その都
度上記操作が繰り返され、共通電極電位値が２５５にな
った時点で終了される。この時点でメモリ６には１８個
の共通電極電位値とそれぞれに対応したフリッカーの大
きさの値が格納されている。このメモリ６に格納された
共通電極電位値を横軸、フリッカーの大きさの値を縦軸
にとりグラフにあらわしたものを図２に示す。Thereafter, the communication control unit 8 raises the common electrode potential value at regular intervals, for example, every 15, and the above operation is repeated each time, and the process is terminated when the common electrode potential value reaches 255. At this point, the memory 6 stores 18 common electrode potential values and flicker magnitude values corresponding thereto. FIG. 2 shows a graph in which the common electrode potential value stored in the memory 6 is plotted on the horizontal axis and the flicker magnitude value is plotted on the vertical axis.
【００１１】その後上記メモリ６に格納された共通電極
電位値及びフリッカーの大きさの値から演算器７は最小
二乗法を用いて２次曲線への近似計算を行なう。この近
似計算式を下記に示す。After that, the calculator 7 uses the least squares method to perform an approximate calculation to a quadratic curve from the common electrode potential value and the flicker magnitude value stored in the memory 6. The approximate calculation formula is shown below.
【００１２】[0012]
【数１】 [Equation 1]
【００１３】ここでｎはサンプリングデータ数（１８
個）、ｘは共通電極電位値、ｙはフリッカーの大きさの
値である。この連立１次方程式を解く事により近似２次
曲線の関数式が求まる。下記にこの近似２次曲線の関数
式を示す。Here, n is the number of sampling data (18
, X is a common electrode potential value, and y is a flicker magnitude value. By solving this simultaneous linear equation, the functional expression of the approximate quadratic curve can be obtained. The functional formula of this approximate quadratic curve is shown below.
【００１４】[0014]
【数２】 (Equation 2)
【００１５】その後演算器７は上記近似２次曲線の最小
値のｘ座標を計算する。この最小値のｘ座標の計算式を
下記に示す。After that, the calculator 7 calculates the x-coordinate of the minimum value of the approximate quadratic curve. The formula for calculating the minimum x-coordinate is shown below.
【００１６】[0016]
【数３】 (Equation 3)
【００１７】この求まった最小値のｘ座標と上記近似２
次曲線を図２のグラフに重ねあわせたものを図３に示
す。The x coordinate of the obtained minimum value and the above approximation 2
A graph obtained by superimposing the following curve on the graph of FIG. 2 is shown in FIG.
【００１８】従ってこの求まった近似２次曲線の最小値
のｘ座標は、液晶テレビ１の画面のフリッカーが最小と
なる共通電極電位値であり、この値は通信コントロール
部８に送られ液晶テレビ１の共通電極電位がこの値に調
整される。Therefore, the minimum x-coordinate of the obtained approximate quadratic curve is the common electrode potential value that minimizes the flicker of the screen of the liquid crystal television 1, and this value is sent to the communication control section 8 and the liquid crystal television 1 is displayed. The common electrode potential of is adjusted to this value.
【００１９】[0019]
【発明の効果】本発明は以上のように液晶テレビの共通
電極電位値の調整において、液晶テレビ画面のフリッカ
ーが最小となる共通電極電位値を演算によって求め、調
整することができるので、高精度の調整ができると共
に、調整時間を大幅に短縮することができる。As described above, according to the present invention, in the adjustment of the common electrode potential value of the liquid crystal television, the common electrode potential value that minimizes the flicker of the liquid crystal television screen can be calculated and adjusted. Can be adjusted and the adjustment time can be significantly shortened.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】本発明の動作説明図であり、サンプリングされ
た１８個の共通電極電位値とフリッカーの大きさの値の
グラフである。FIG. 2 is an operation explanatory diagram of the present invention, and is a graph of 18 sampled common electrode potential values and flicker magnitude values.
【図３】本発明の動作説明図であり、上記第２図に演算
器で計算された近似２次曲線とこの２次曲線の最小値の
ｘ座標を重ね合わせたグラフである。FIG. 3 is an operation explanatory view of the present invention, and is a graph in which the approximate quadratic curve calculated by the arithmetic unit and the minimum x-coordinate of the quadratic curve are superimposed on FIG.
１ 液晶テレビ ２ 光電変換素子 ３ フィルター回路 ４ 実効値ＤＣ変換器 ５ Ａ／Ｄ変換器 ６ メモリ ７ 演算器 ８ 通信コントロール部 ９ 映像信号発生器 1 liquid crystal television 2 photoelectric conversion element 3 filter circuit 4 effective value DC converter 5 A / D converter 6 memory 7 arithmetic unit 8 communication control section 9 video signal generator
Claims (1)
ー）を最小とする為に行われる共通電極電位の調整おい
て、共通電極電位の値を一定間隔で変化させる共通電極
電位値コントロール手段と、それぞれの共通電極電位値
での液晶テレビ画面のフリッカーを電気信号に変換する
光電変換素子と、フリッカーの信号成分のみを取り出す
フィルター回路と、この取り出された信号の大きさをデ
ジタル値に変換するデジタル変換手段と、このデジタル
値及び上記共通電極電位の値を記憶するメモリ手段と、
このメモリ手段に取り込まれたデジタル値及び共通電極
電位の値から、最小二乗法により２次曲線への近似を行
い、この２次曲線の最小値のｘ座標を演算する演算手段
とを設け、この最小値のｘ座標から液晶テレビの画面の
フリッカーが最小となる共通電極電位値に調整すること
を特徴とする液晶テレビの共通電極電位調整装置。1. A common electrode potential value control means for changing the value of the common electrode potential at a constant interval in the adjustment of the common electrode potential performed to minimize the flicker of a liquid crystal television screen. A photoelectric conversion element for converting flicker of a liquid crystal television screen at a common electrode potential value into an electric signal, a filter circuit for extracting only the flicker signal component, and a digital conversion means for converting the magnitude of the extracted signal into a digital value. And memory means for storing the digital value and the value of the common electrode potential,
The digital value and the common electrode potential value stored in the memory means are approximated to a quadratic curve by the method of least squares, and a calculating means for calculating the x coordinate of the minimum value of the quadratic curve is provided. A common electrode potential adjusting device for a liquid crystal television, which adjusts from a minimum x-coordinate to a common electrode potential value that minimizes flicker on the screen of the liquid crystal television.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32886495A JPH09168128A (en) | 1995-12-18 | 1995-12-18 | Common electrode potential adjustment device for liquid crystal television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32886495A JPH09168128A (en) | 1995-12-18 | 1995-12-18 | Common electrode potential adjustment device for liquid crystal television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09168128A true JPH09168128A (en) | 1997-06-24 |
Family
ID=18214955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32886495A Pending JPH09168128A (en) | 1995-12-18 | 1995-12-18 | Common electrode potential adjustment device for liquid crystal television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09168128A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029571A (en) * | 2002-06-27 | 2004-01-29 | Nokia Corp | Liquid crystal display device and device and method for adjusting vcom |
| JP2013156318A (en) * | 2012-01-27 | 2013-08-15 | Casio Comput Co Ltd | Projector and projection control method |
| CN103366657A (en) * | 2013-07-17 | 2013-10-23 | 青岛海信电器股份有限公司 | Flicker regulating system |
| CN103592786A (en) * | 2013-11-08 | 2014-02-19 | 武汉精立电子技术有限公司 | Auto-Flicker automatic tuning method for liquid crystal module |
| CN103616775A (en) * | 2013-11-22 | 2014-03-05 | 武汉精立电子技术有限公司 | Method for automatically adjusting Auto-Flicker of liquid crystal module on basis of machine vision |
| JP2022061622A (en) * | 2020-10-07 | 2022-04-19 | 村田機械株式会社 | Ceiling carrier and calculation method of rotation amount of winding drum in ceiling carrier |
-
1995
- 1995-12-18 JP JP32886495A patent/JPH09168128A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029571A (en) * | 2002-06-27 | 2004-01-29 | Nokia Corp | Liquid crystal display device and device and method for adjusting vcom |
| JP2013156318A (en) * | 2012-01-27 | 2013-08-15 | Casio Comput Co Ltd | Projector and projection control method |
| CN103366657A (en) * | 2013-07-17 | 2013-10-23 | 青岛海信电器股份有限公司 | Flicker regulating system |
| CN103366657B (en) * | 2013-07-17 | 2016-07-13 | 青岛海信电器股份有限公司 | Flicker regulates system |
| CN103592786A (en) * | 2013-11-08 | 2014-02-19 | 武汉精立电子技术有限公司 | Auto-Flicker automatic tuning method for liquid crystal module |
| CN103616775A (en) * | 2013-11-22 | 2014-03-05 | 武汉精立电子技术有限公司 | Method for automatically adjusting Auto-Flicker of liquid crystal module on basis of machine vision |
| JP2022061622A (en) * | 2020-10-07 | 2022-04-19 | 村田機械株式会社 | Ceiling carrier and calculation method of rotation amount of winding drum in ceiling carrier |
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