JPS61148492A - Method and apparatus for controlling liquid crystal display unit - Google Patents
Method and apparatus for controlling liquid crystal display unitInfo
- Publication number
- JPS61148492A JPS61148492A JP27707285A JP27707285A JPS61148492A JP S61148492 A JPS61148492 A JP S61148492A JP 27707285 A JP27707285 A JP 27707285A JP 27707285 A JP27707285 A JP 27707285A JP S61148492 A JPS61148492 A JP S61148492A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- function generator
- display device
- switch
- 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
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
- G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
- G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
液晶表示装置は多くの装置において、情報を表示するた
めに用いられる。しかし表示の視認性はこの種の表示装
置を観察するさいの角度(以下においては視角と呼ぶ)
に左右される。表示装置の面に対してほぼ垂直に観察す
るばあい□つまり視界が小さいばあい一表示のコントラ
ストは実際に大きい。DETAILED DESCRIPTION OF THE INVENTION Industrial Applications Liquid crystal displays are used in many devices to display information. However, the visibility of the display depends on the angle (hereinafter referred to as viewing angle) when observing this type of display device.
depends on. When viewed approximately perpendicular to the plane of the display, the contrast of the display is actually large when the field of view is small.
垂直からの偏角が大きいほど、たとえば視界が5oない
し60度のばあいには、コントラストは偏角がどの方向
に行なわれるかに左右される。The larger the angle of deviation from the vertical, for example when the field of view is 5° to 60°, the contrast will depend on the direction in which the deviation is performed.
発明が解決しようとする問題点
これが不都合なのはとくに、液晶表示装置をたとえばカ
ーラジオにおいているいろな方向から視認しようとする
ばあいである。Problems to be Solved by the Invention This is particularly inconvenient if the liquid crystal display device is to be viewed from various directions, for example in a car radio.
それゆえ本発明の課題は、この方向依存性を少なくして
、いろいろな方向から見て液晶表示装置のコントラスト
が、したがってまた視認性ができるかぎり大きくなるよ
うにすること1ある。It is therefore an object of the invention to reduce this directional dependence so that the contrast and therefore the visibility of the liquid crystal display device when viewed from various directions is as high as possible.
発明を解決するための手段
上述の問題点は特許請求の範囲第1項に記載の特徴部分
の記載の構成により解決される。本発明の方法は、でき
るかぎり大きい視角からの液晶表示装置の視認性が大幅
に方向に依存せずに保証されているという利点を有する
。Means for Solving the Invention The above-mentioned problem is solved by the configuration described in the characterizing part of claim 1. The method according to the invention has the advantage that the visibility of the liquid crystal display from the widest possible viewing angles is guaranteed to a large extent independent of direction.
たとえばカーラジオに組込んだ本発明により制御される
液晶表示装置は、運転席からでも助手席からでも、正常
な着席姿勢を取っていれば読み取ることができる。For example, a liquid crystal display device controlled by the present invention incorporated into a car radio can be read from either the driver's seat or the passenger's seat as long as the vehicle is in a normal seating position.
特許請求の範囲第6項および第7項に本発明の装置が記
載しである。The device of the present invention is described in claims 6 and 7.
実施例
本発明の実施例を図面に基づいて、以下の記述において
詳細に説明する。Embodiments Examples of the present invention will be explained in detail in the following description based on the drawings.
第1図に示す極座標線図は、液晶表示装置のコントラス
トを、それを観皺する方向にそれぞれの半径として示し
ている。パラメータとして視角の度数が選ん1ある。The polar coordinate diagram shown in FIG. 1 shows the contrast of a liquid crystal display device as radii in the direction in which it is viewed. The degree of viewing angle is selected as a parameter.
視角の度数が小さいばあい、つまりほとんど垂直に見る
ばあいには、コントラストは観察方向の如何によらずほ
とんど100y;に近い。それは曲線1で描いである。When the viewing angle is small, that is, when viewed almost vertically, the contrast is almost close to 100y, regardless of the viewing direction. It is depicted by curve 1.
視角が55度のばあいにはコントラストは落込部を有す
る。とくに60ないし70度の方向のばあいがそう1あ
る。曲線2から読み取れるように、このばあいにはコン
トラストは約40%に低下し、そのさいには表示装置の
視認性は、とくに照明状態が不利なばあいにはもはや保
証されない。しかしながらまさにこの方向こそ、カーラ
ジオが計器板の中央下部に組込んであるばあい、乗用車
の助手席から通常の着席姿勢1観察する角度なのである
。When the viewing angle is 55 degrees, the contrast has a dip. There is one case in particular where the direction is 60 to 70 degrees. As can be seen from curve 2, the contrast in this case drops to about 40%, and the visibility of the display is no longer guaranteed, especially in unfavorable lighting conditions. However, this is precisely the angle from which the normal seating position 1 is observed from the passenger seat of a passenger car, if the car radio is installed in the center lower part of the instrument panel.
曲線3は本発明の方法を用いたばあいのコントラストの
変化を示す。そのばあいコントラストの最小値はともか
く約60%であり、これは表示装置の視認性に大いに寄
与している。Curve 3 shows the change in contrast when using the method of the invention. In that case, the minimum contrast value is about 60%, which greatly contributes to the visibility of the display device.
第2図は本発明的方法を実施するための装置を示す。こ
の装置においては、背面電極−パックプレーンとも呼ば
れる□には3角波またはのこぎり波状の電圧が加えられ
ており、この電圧は+6.5■と−6,5■の極値間を
連続して変化する部分を有する。この電圧はそれ自体は
公知の関数発生器4によって作られ結合コンデンサ5を
介して、略図的に断面1描いた液晶表示装置7の背面電
極6に供給される。FIG. 2 shows an apparatus for carrying out the inventive method. In this device, a triangular or sawtooth wave voltage is applied to the back electrode - also called the pack plane, and this voltage continuously changes between the extreme values of +6.5■ and -6.5■. It has a changing part. This voltage is generated by a function generator 4, which is known per se, and is supplied via a coupling capacitor 5 to a rear electrode 6 of a liquid crystal display 7, which is diagrammatically shown in cross section 1.
セグメント電極8はスイッチ9を介して関数発生密生の
もう1つの出力側に接続されている。スイッチ9が上側
位置にあれば、セグメント電極8には背面電極6の電圧
と同じ電圧がかかつている。つまり液晶は電界にさらさ
れておらず、光が液晶を透過し得るわけである。The segment electrode 8 is connected via a switch 9 to another output of the function generator. When the switch 9 is in the upper position, the same voltage as the voltage on the back electrode 6 is applied to the segment electrode 8 . In other words, the liquid crystal is not exposed to an electric field, and light can pass through the liquid crystal.
次に、通常は電子スイッチであるスイッチ9を下側位置
に移すと、セグメント電極8には地電位が印加される。Next, when the switch 9, which is usually an electronic switch, is moved to the lower position, a ground potential is applied to the segment electrode 8.
つまり、背面電極6とセグメント電極8との間に、図示
した変化を示す電圧がかかるわけである。液晶は分子配
列が変わり、したがって光を透過しなくなる。In other words, a voltage exhibiting the illustrated change is applied between the back electrode 6 and the segment electrode 8. Liquid crystal molecules change their molecular arrangement and therefore no longer transmit light.
液晶は電界強度変化に追従し、そのさい電界強度変化の
周波数で良および不良視角領域を通遇する。この周波数
はちらつき限界よりも高くするのがよい。そのばあいは
35ないし50Hzの値が有利であることが明らかにさ
れた。The liquid crystal follows changes in electric field strength, passing through good and poor viewing angle regions at the frequency of the change in electric field strength. This frequency should be higher than the flicker limit. Values of 35 to 50 Hz have proven advantageous in that case.
この周波数の上限は液晶の慣性によって定められている
。温度が低いばあいには液晶の慣性は、周波数の低下が
有利であり得るような大きさである。そのためには関数
発生器4の周波数決定回路に温度依存抵抗10を設けて
おくことができる。The upper limit of this frequency is determined by the inertia of the liquid crystal. At low temperatures, the inertia of the liquid crystal is such that a reduction in frequency may be advantageous. For this purpose, a temperature-dependent resistor 10 can be provided in the frequency determining circuit of the function generator 4.
第2図による装置に類似の装置を示すのが第3図1ある
。しかし関数発生器11は、たがいに逆向きの信号を有
する2つの出力を自由に利用できる。背面電極6は一方
の出力側に固定的接続してあり、セグメント電極8はス
イッチ12を介して選択的に第1のまたは第2の出力側
と接続することができる。A device similar to the device according to FIG. 2 is shown in FIG. However, the function generator 11 has at its disposal two outputs with opposite signals. The back electrode 6 is permanently connected to one output side, and the segment electrode 8 can be selectively connected via a switch 12 to the first or second output side.
上側スイッチ位置のばあいには電界強度は零である。つ
まり、液晶は透過性がある。スイッチ12が下側位置に
あれば、電極には逆相電圧のが加わる。液晶へ作用電圧
は図示した変化を示す。振幅は図示のものの2倍の大き
さ!ある。In the upper switch position the electric field strength is zero. In other words, liquid crystals are transparent. When switch 12 is in the lower position, a negative sequence voltage is applied to the electrodes. The voltage applied to the liquid crystal exhibits the changes shown. The amplitude is twice as large as the one shown! be.
第2図による装置を少し詳細に示したのが第4図である
。第4図による装置のばあいには、スイッチ9の代りに
セグメント電極14,15.16それぞれに抵抗17.
18.19および電界効果形トランジスタ20,21.
22が設けである。FIG. 4 shows the apparatus according to FIG. 2 in some detail. In the case of the device according to FIG. 4, instead of the switch 9, a resistor 17.
18.19 and field effect transistors 20, 21.
22 is provided.
入力側23,24.25を介して液晶表示装置を制御す
るための信号が供給される。これらの信号の値に応じて
、当該電界効果形トランジスタ20,21.22が導通
または非導通状態に制御される。当該電界効果形トラン
ジスタ20.21.22と接続されたセグメント電極1
4.15.16は、該電界効果形トランジスタが導通状
態のばあいに黒くなる。Signals for controlling the liquid crystal display are supplied via inputs 23, 24, 25. Depending on the values of these signals, the field effect transistors 20, 21, 22 are controlled to be conductive or non-conductive. Segment electrode 1 connected to the field effect transistor 20.21.22
4.15.16 turns black when the field effect transistor is in a conductive state.
図に示した電圧変化の代りに他の曲線波形もまた可能フ
ある。たとえば正弦波電圧も用いることが1きる。Other curved waveforms are also possible instead of the voltage changes shown in the figure. For example, a sinusoidal voltage can also be used.
発明の効果
本発明によれば液晶表示装置に対する視角角度に対する
方向依存性を低下でき、液晶表示装置のコントラストを
大きくでき、視認性が大きくなる。Effects of the Invention According to the present invention, the directional dependence of the viewing angle of the liquid crystal display device can be reduced, the contrast of the liquid crystal display device can be increased, and the visibility can be increased.
第1図は本発明的方法使用の有無による液晶表示装置の
コントラストの方向依存性の違いを図解するための極座
標線図、第2図は本発明的方法を実施した装置の実施例
の路線図、第3図は本発明的方法を実施した変形実施例
の路線図、第4図は第2図による装置の詳細回路図であ
る。
4・・・関数発生器、6・・・背面電極、7・・液晶表
示装置、8.14.1.5.16・・・セグメント電極Fig. 1 is a polar coordinate diagram for illustrating the difference in the directional dependence of the contrast of a liquid crystal display device depending on whether the method of the present invention is used, and Fig. 2 is a route diagram of an example of a device in which the method of the present invention is implemented. , FIG. 3 is a route diagram of a variant embodiment implementing the method according to the invention, and FIG. 4 is a detailed circuit diagram of the apparatus according to FIG. 2. 4...Function generator, 6...Back electrode, 7...Liquid crystal display device, 8.14.1.5.16...Segment electrode
Claims (1)
にある複数の値を一時的に取ることを特徴とする液晶表
示装置を制御する方法。 2、限界値間で連続的電圧変化が行なわれる特許請求の
範囲第1項記載の方法。 3、限界値間で段階的電圧変化が行なわれる特許請求の
範囲第1項記載の方法。 4、該電圧変化が周期的に行なわれる特許請求の範囲第
1項記載の方法。 5、液晶表示装置の背面電極に、セグメント電極が光を
透過しないばあいにはセグメント電極と逆相の電圧が、
セグメント電極が光を透過するばあいには同相の電圧が
加わる特許請求の範囲第4項記載の方法。 6、関数発生器(4)が設けてあり、その出力側が液晶
表示装置(7)の背面電極(6)に接続されており液晶
表示装置のセグメント電極(8)のそれぞれにスイッチ
(9)が設けてあり、該スイッチによりセグメント電極
(8)を関数発生器(4)の出力または一定の電位を有
する点に選択的に接続するようにしたことを特徴とする
液晶表示装置を制御する装置。 7、関数発生器(11)が設けてあり、その第1の出力
側が液晶表示装置(7)の背面電極に接続されており、
液晶表示装置のセグメント電極のそれぞれにスイッチ(
9)が設けてあり、該スイッチによりセグメント(8)
を関数発生器(11)の第1出力側または関数発生器(
11)の第2出力に選択的に接続するようにし、関数発
生器(11)の第2出力側に第1出力側の信号と逆相の
信号が供給されるようにしたことを特徴とする液晶表示
装置を制御する装置。[Claims] 1. A method for controlling a liquid crystal display device, characterized in that the voltage between the electrodes temporarily assumes not only two limit values but also a plurality of values between the limit values. 2. A method according to claim 1, in which a continuous voltage change is carried out between limit values. 3. A method according to claim 1, in which stepwise voltage changes are carried out between limit values. 4. The method according to claim 1, wherein the voltage change is performed periodically. 5. If the segment electrodes do not transmit light, a voltage of opposite phase to the segment electrodes is applied to the back electrode of the liquid crystal display device.
5. The method according to claim 4, wherein in-phase voltages are applied when the segment electrodes transmit light. 6. A function generator (4) is provided, the output side of which is connected to the back electrode (6) of the liquid crystal display (7), and a switch (9) is connected to each of the segment electrodes (8) of the liquid crystal display. A device for controlling a liquid crystal display device, characterized in that the switch selectively connects the segment electrode (8) to the output of the function generator (4) or to a point having a constant potential. 7. A function generator (11) is provided, the first output side of which is connected to the back electrode of the liquid crystal display (7);
A switch (
9) is provided, and the switch allows segment (8)
on the first output side of the function generator (11) or the function generator (
The function generator (11) is selectively connected to the second output of the function generator (11), so that the second output side of the function generator (11) is supplied with a signal having an opposite phase to the signal on the first output side. A device that controls a liquid crystal display device.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843445438 DE3445438A1 (en) | 1984-12-13 | 1984-12-13 | METHOD AND ARRANGEMENT FOR CONTROLLING LIQUID CRYSTAL DISPLAY DEVICES |
DE3445438.1 | 1984-12-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61148492A true JPS61148492A (en) | 1986-07-07 |
Family
ID=6252649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27707285A Pending JPS61148492A (en) | 1984-12-13 | 1985-12-11 | Method and apparatus for controlling liquid crystal display unit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0184762A3 (en) |
JP (1) | JPS61148492A (en) |
DE (1) | DE3445438A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101256602B1 (en) | 2012-01-18 | 2013-04-19 | 현대중공업 주식회사 | Guide frame support device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3534703A1 (en) * | 1985-09-28 | 1987-04-09 | Philips Patentverwaltung | CONTROL CIRCUIT FOR A LIQUID CRYSTAL DISPLAY UNIT |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS556916B1 (en) * | 1970-11-17 | 1980-02-20 | ||
GB1459792A (en) * | 1973-07-20 | 1976-12-31 | Instron Ltd | Electronic ramp function generator |
JPS5917430B2 (en) * | 1977-10-31 | 1984-04-21 | シャープ株式会社 | Matrix type liquid crystal display device |
EP0106386A3 (en) * | 1982-09-23 | 1985-03-13 | BBC Brown Boveri AG | Method of triggering a multiplexable bistable liquid crystal display |
-
1984
- 1984-12-13 DE DE19843445438 patent/DE3445438A1/en not_active Withdrawn
-
1985
- 1985-12-03 EP EP85115349A patent/EP0184762A3/en not_active Withdrawn
- 1985-12-11 JP JP27707285A patent/JPS61148492A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101256602B1 (en) | 2012-01-18 | 2013-04-19 | 현대중공업 주식회사 | Guide frame support device |
Also Published As
Publication number | Publication date |
---|---|
EP0184762A3 (en) | 1988-09-28 |
DE3445438A1 (en) | 1986-06-19 |
EP0184762A2 (en) | 1986-06-18 |
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