JP2575189B2 - Liquid crystal device - Google Patents
Liquid crystal deviceInfo
- Publication number
- JP2575189B2 JP2575189B2 JP20506788A JP20506788A JP2575189B2 JP 2575189 B2 JP2575189 B2 JP 2575189B2 JP 20506788 A JP20506788 A JP 20506788A JP 20506788 A JP20506788 A JP 20506788A JP 2575189 B2 JP2575189 B2 JP 2575189B2
- Authority
- JP
- Japan
- Prior art keywords
- display area
- scanning
- electrodes
- scan
- 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.)
- Expired - Fee Related
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
- G09G3/20—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
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0224—Details of interlacing
- G09G2310/0227—Details of interlacing related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0232—Special driving of display border areas
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/04—Partial updating of the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
- G09G2310/063—Waveforms for resetting the whole screen at once
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/065—Waveforms comprising zero voltage phase or pause
-
- 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
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
Description
【発明の詳細な説明】 〔発明の分野〕 本発明は、液晶装置に関し、詳しくは強誘電性液晶を
用いた液晶装置に関するものである。Description: FIELD OF THE INVENTION The present invention relates to a liquid crystal device, and more particularly, to a liquid crystal device using a ferroelectric liquid crystal.
クラークとラガーウオルは、Applied Physics Letter
s第36巻，第11号（1980年６月１日発行）、P.899-901、
又は米国特許第4,367,924号、米国特許第4,563,059号
で、表面安定化強誘電性液晶（Surface-stabilized fer
roelectric liquid crystal）による双安定性強誘電性
液晶を明らかにした。この双安定性強誘電性液晶は、バ
ルク状態のカイラルスメクチツク相における液晶分子の
らせん配列構造の形成を抑制するために十分に小さい間
隔に設定した一対の基板間に配置させ、且つ複数の液晶
分子で組織された垂直分子層を一方向に配列させること
によって実現された。Clark and Lager Walk are Applied Physics Letter
s Vol. 36, No. 11, June 1, 1980, P.899-901,
Alternatively, US Pat. No. 4,367,924 and US Pat. No. 4,563,059 describe a surface-stabilized ferroelectric liquid crystal (Surface-stabilized ferroelectric liquid crystal).
Bistable ferroelectric liquid crystal by roelectric liquid crystal) was revealed. The bistable ferroelectric liquid crystal is disposed between a pair of substrates set at a sufficiently small interval to suppress the formation of a helical arrangement structure of liquid crystal molecules in a chiral smectic phase in a bulk state, and This was realized by arranging the vertical molecular layers organized by liquid crystal molecules in one direction.
かかる強誘電性液晶で形成した表面画面を備えた液晶
装置は、例えば神辺らの米国特許第4655561号公報など
に記載されたマルチプレクシング駆動方式を用いること
によって大容量画素の表示画面に画像を形成することが
できる。A liquid crystal device having a surface screen formed of such a ferroelectric liquid crystal forms an image on a display screen of a large capacity pixel by using a multiplexing driving method described in, for example, U.S. Pat. can do.
この液晶装置は、ワード・プロセツサやパーソナル・
コンピユーターなどの表示画面に利用されることができ
るが、これを表示装置に組込むためには、液晶セルの周
囲をフレームする筐体構造とする必要がある。ところ
で、液晶セルは、強誘電性液晶を一対のガラス板によっ
て挟持したセル構造となっているため、CRTの様に表示
画面を湾曲させることができないので、液晶セルを組込
むための周囲フレームがオペレータに対して表示画面の
一部をさえぎる問題点があった。This liquid crystal device is used for word processors and personal computers.
Although it can be used for a display screen of a computer or the like, in order to incorporate it into a display device, it is necessary to have a housing structure that frames around a liquid crystal cell. By the way, since the liquid crystal cell has a cell structure in which ferroelectric liquid crystal is sandwiched between a pair of glass plates, the display screen cannot be curved like a CRT, so the surrounding frame for incorporating the liquid crystal cell is an operator. However, there is a problem that a part of the display screen is blocked.
このため、周囲フレームによって表示画面の一部がさ
えぎられる領域を非表示領域として指定し、周囲フレー
ムによって表示画面がさえぎられない領域を有効表示領
域として指定し、該非表示領域に対しては常時白（又は
黒）の状態を維持させ、該有効表示領域のみに表示画像
を形成する様に駆動回路を制御する必要があった。Therefore, an area where a part of the display screen is interrupted by the surrounding frame is designated as a non-display area, an area where the display screen is not interrupted by the surrounding frame is designated as an effective display area, and the non-display area is always white. (Or black) state, and it is necessary to control the drive circuit so that a display image is formed only in the effective display area.
しかしながら、本発明者らの実験によれば、周囲フレ
ームによってさえぎられる非表示領域のうち、有効表示
領域の上側と下側領域、すなわち有効表示領域内の走査
電極と平行で、該領域内の走査電極の外側に位置する領
域の非表示領域における白（又は黒）の光学的な透過状
態が走査周期毎に変動し、特に外部温度が低温側になる
と、一走査選択期間を長く設定する必要があるため、低
温での駆動時では一走査動作（一フレーム又は一フイー
ルド）の周波数が大きくなり、非表示領域における白
（又は黒）の光学的な透過状態の変動が目だち、ちらつ
きとして視認される問題点が判明した。However, according to the experiments of the present inventors, among the non-display areas intercepted by the surrounding frame, the upper and lower areas of the effective display area, that is, the scanning in the effective display area are parallel to the scan electrodes. The optical transmission state of white (or black) in the non-display area of the area located outside the electrode fluctuates in each scanning cycle. In particular, when the external temperature is lower, it is necessary to set one scanning selection period longer. Therefore, when driving at a low temperature, the frequency of one scanning operation (one frame or one field) becomes large, and the change in the optical transmission state of white (or black) in the non-display area is visually recognized as flickering and flickering. Problem was found.
本発明の目的は、前述の問題点、特に非表示領域にお
ける白（又は黒）の光学的な透過状態の変動によるちら
つきの発生を抑制した液晶装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal device which suppresses the above-mentioned problems, in particular, the occurrence of flicker due to a change in the optical transmission state of white (or black) in a non-display area.
本発明は、複数の走査電極及び複数の信号電極で形成
したマトリクス電極と強誘電性液晶とを備えた液晶素子
と、該走査電極に走査選択信号を印加し該信号電極に該
走査選択信号と同期して情報信号を印加する為の第１の
手段とを有する液晶装置において、該マトリクス電極に
より形成された表示画面を有効表示領域と非表示領域と
に区分け、該非表示領域内の走査電極に印加する該走査
選択信号の印加周期を、該有効表示領域内の走査電極に
印加する該走査選択信号の印加周期より短くなるように
該第１の手段を制御する為の第２の手段を有する液晶装
置である。また、本発明は、複数の走査電極及び複数の
信号電極で形成したマトリクス電極と強誘電性液晶とを
備えた液晶素子と、該走査電極に走査選択信号を印加し
該信号電極に該走査選択信号と同期して情報信号を印加
する為の第１の手段と、を有する液晶装置において、該
マトリクス電極により形成された表示画面を有効表示領
域と非表示領域とに区分け、該有効表示領域内の走査電
極に対してＮ本おきに該走査選択信号を印加することに
よってＮ＋１回のフィールド走査によって該有効表示領
域内のＭ本の走査電極に該走査選択信号を印加し、該有
効表示領域内のＭ本より少ない本数の走査電極への該走
査選択信号の印加動作毎に、該非表示領域内の走査電極
に該走査選択信号を印加するように該第１の手段を制御
する第２の手段を有する液晶装置である。The present invention provides a liquid crystal element including a matrix electrode formed of a plurality of scanning electrodes and a plurality of signal electrodes and a ferroelectric liquid crystal, and applying a scanning selection signal to the scanning electrode and applying the scanning selection signal to the signal electrode. In a liquid crystal device having first means for applying an information signal in synchronization, a display screen formed by the matrix electrodes is divided into an effective display area and a non-display area, and a scanning electrode in the non-display area is divided into a display area and a non-display area. A second means for controlling the first means so that an application cycle of the scan selection signal to be applied is shorter than an application cycle of the scan selection signal applied to the scan electrodes in the effective display area. It is a liquid crystal device. Also, the present invention provides a liquid crystal element including a matrix electrode formed of a plurality of scanning electrodes and a plurality of signal electrodes and a ferroelectric liquid crystal, and applying a scan selection signal to the scan electrode to apply the scan selection signal to the signal electrode. A first means for applying an information signal in synchronization with a signal, wherein a display screen formed by the matrix electrodes is divided into an effective display area and a non-display area, The scan selection signal is applied to every M scan electrodes in the effective display area by N + 1 times of field scans by applying the scan selection signal to every N scan electrodes to the scan electrodes in the effective display area. A second means for controlling the first means so as to apply the scan selection signal to the scan electrodes in the non-display area every time the scan select signal is applied to the number of scan electrodes less than M. Liquid crystal with It is the location.
第１図は、本発明の液晶装置を示すブロツク図であ
る。第１図に示す液晶装置は、走査電極及び信号電極で
形成したマトリクス電極と強誘電性液晶とを備えた強誘
電性液晶パネル11、信号電極駆動回路12並びに走査電極
駆動回路13を有している。さらに、この液晶装置には、
外部温度を検出し、所定の電圧値の範囲（例えば、温度
範囲０℃〜60℃に対して、2.5V〜0V）で出力する温度セ
ンサー10（例えば、サーミスタ）が設けられている。こ
の温度センサー10により出力された電圧値は液晶パネル
制御回路14内のA/D変換器16によって所定のビツト数に
デジタル変換され、かかるビツト数を駆動波形発生制御
部15内のマイクロ・プロセツサ・ユニツトMPU17によっ
て判読し、その信号を電圧コントローラ18と周波数コン
トローラ19に入力することによって、走査電極駆動回路
13と信号電極駆動回路12からの出力波形（一走査選択期
間と駆動電圧波高値）を制御することができる。FIG. 1 is a block diagram showing a liquid crystal device of the present invention. The liquid crystal device shown in FIG. 1 includes a ferroelectric liquid crystal panel 11 having a matrix electrode formed of scanning electrodes and signal electrodes and a ferroelectric liquid crystal, a signal electrode driving circuit 12, and a scanning electrode driving circuit 13. I have. Furthermore, this liquid crystal device
A temperature sensor 10 (for example, a thermistor) that detects an external temperature and outputs the voltage in a predetermined voltage range (for example, 2.5 V to 0 V for a temperature range of 0 ° C. to 60 ° C.) is provided. The voltage value output from the temperature sensor 10 is digitally converted into a predetermined number of bits by an A / D converter 16 in the liquid crystal panel control circuit 14, and the number of bits is converted into a microprocessor number in a drive waveform generation control unit 15 by a microprocessor. The scan electrode drive circuit is read by the unit MPU 17 and the signal is input to the voltage controller 18 and the frequency controller 19.
It is possible to control the output waveforms (one scanning selection period and the driving voltage peak value) from the signal electrode driving circuit 13 and the signal electrode driving circuit 12.
第２図は、液晶パネルの周囲を覆った周囲フレーム21
で液晶パネルを固定した表示装置の平面図である。この
表示装置の表示画面には前述した有効表示領域22と非表
示領域23とに区別けられている。FIG. 2 shows a peripheral frame 21 covering the periphery of the liquid crystal panel.
FIG. 4 is a plan view of a display device to which a liquid crystal panel is fixed. The display screen of this display device is divided into the effective display area 22 and the non-display area 23 described above.
第３図は、表示画面を形成するマトリクス電極の平面
図である。このマトリクス電極は、非表示領域23内の走
査電極31及び有効表示領域22内の走査電極32からなる走
査電極群と信号電極33の群とが交差配置（交差部は画素
を意味する）され、走査電極群は走査電極駆動回路13に
接続されており、信号電極33の群は信号電極駆動回路12
に接続されている。本発明の好ましい具体例では非表示
領域23内の走査電極31は有効表示領域22内の走査電極32
より幅広に設定することができ、一般には1mm〜10mm幅
程度に設定することができる。又、同一幅とした時に
は、複数本配置とすることができる。FIG. 3 is a plan view of a matrix electrode forming a display screen. In this matrix electrode, a scan electrode group consisting of a scan electrode 31 in the non-display area 23 and a scan electrode 32 in the effective display area 22 and a group of signal electrodes 33 are arranged so as to intersect (an intersection means a pixel), The scanning electrode group is connected to the scanning electrode driving circuit 13, and the group of the signal electrodes 33 is connected to the signal electrode driving circuit 12.
It is connected to the. In a preferred embodiment of the present invention, the scan electrodes 31 in the non-display area 23 correspond to the scan electrodes 32 in the effective display area 22.
The width can be set wider, and generally it can be set to about 1 mm to 10 mm width. Further, when the width is the same, a plurality of lines can be arranged.
第４図は、本発明で用いた駆動電圧信号の波形を示し
ている。一走査選択期間内に一走査電極に電圧Ｖ1と電
圧−Ｖ2とが交番し、電圧０をもつ走査選択信号が印加
される（電圧Ｖ1，−Ｖ2,0は走査非選択信号を基準とし
た値である）。信号電極33に情報に応じて黒又は白の情
報信号が印加される。本実施例では、走査選択信号が印
加された走査電極上の画素は、一走査選択期間の期間Ｔ
1で一斉に黒の状態に消去され、続く期間Ｔ2で情報信号
（黒）が印加された画素は黒の状態に、情報信号（白）
が印加された画素は白の状態に設定される。FIG. 4 shows the waveform of the drive voltage signal used in the present invention. Alternating the voltage V 1 and the voltage -V 2 to one scanning electrode in one scanning selection period, (voltages V 1 scanning selection signal is applied with a voltage 0, and -V 2, 0 scanning non-selection signal This is the reference value). A black or white information signal is applied to the signal electrode 33 according to the information. In the present embodiment, the pixels on the scanning electrodes to which the scanning selection signal is applied are in a period T of one scanning selection period.
Simultaneously erased to black state at 1, the pixel information signal (black) is applied in the subsequent period T 2 to the black state, the information signal (white)
Is set to a white state.
第５図は、第４図に示す走査選択信号の走査電極に対
する印加順序を表わした波形図である。第５図に示す走
査順序によれば、有効表示領域内の走査電極Ｓ1,S2…Ｓ
F9+8(S-1)に対して８本おきに走査選択信号を順次印加
し、９回の走査動作（９回のフイールド走査）によって
一画面を形成する走査動作（一フレーム走査）が行われ
た。この際、各フイールド走査毎に非表示領域内の走査
電極ＳA及びＳBに走査選択信号が印加される。図中の
「Ｆ1」，「Ｆ2」，…「Ｆ9」は一フレーム走査中のフ
イールド順番、「Ｓ」は一フイールド走査中の走査順番
を表わしている。FIG. 5 is a waveform chart showing the order of applying the scan selection signals shown in FIG. 4 to the scan electrodes. According to the scanning order shown in FIG. 5, the scanning electrodes S 1 , S 2 .
A scan selection signal is sequentially applied every eight lines to F9 + 8 (S-1) , and a scan operation (one frame scan) for forming one screen by nine scan operations (nine field scans) is performed. Was done. At this time, a scan selection signal is applied to the scan electrodes S A and S B in the non-display area for each field scan. In the figure, “F 1 ”, “F 2 ”,... “F 9 ” represent the field order during one frame scanning, and “S” represents the scanning order during one field scanning.
又、本発明の好ましい具体例では、非表示領域内の走
査電極ＳAとＳBに対して、各フイールド走査毎に２回又
はそれ以上の周期で走査選択信号を印加することができ
る。例えば、各フイールド走査のうち1/2のフイールド
走査が終了した時に走査電極ＳAに走査選択信号を印加
し、続く残りの1/2のフイールド走査が終了した時に走
査電極ＳBに走査選択信号を印加することができる。Further, in a preferred embodiment of the present invention, the scan selection signal can be applied to the scan electrodes S A and S B in the non-display area twice or more in each field scan. For example, the scanning electrode S of the scanning selection signal is applied to A, followed by the remaining 1/2 scanning selection signal to the scanning electrodes S B when the field scan is finished when the field scanning of half of each field scanning is completed Can be applied.
第５図に示す駆動例では、非表示領域内の走査電極Ｓ
AとＳBに走査選択信号が印加されたタイミングと同期し
て、第４図に示す情報信号のうち何れか一方のみの情報
信号を信号電極33に印加する様に信号電極駆動回路12が
制御される。又、有効表示領域内の走査電極Ｓ1,S2…Ｓ
F9+8(S-1)に走査選択信号が印加されたタイミングと同
期して、信号電極に情報に応じて画像が表示される様
に、選択的に情報信号が印加される。In the driving example shown in FIG. 5, the scanning electrode S in the non-display area
In synchronism with the timing at which the scanning selection signal to the A and S B is applied, a fourth signal electrode driving circuit 12 so as to apply a data signal of either only of the information signal shown in FIG. The signal electrode 33 is controlled Is done. The scanning electrodes S 1 , S 2 ... S in the effective display area
The information signal is selectively applied such that an image is displayed on the signal electrode in accordance with the information in synchronization with the timing at which the scan selection signal is applied to F9 + 8 (S-1) .
次に、本発明者らは、下記の強誘電性液晶パネルと第
４図に示す駆動波形を用いてＮ本おき走査で、各フイー
ルド走査毎に非表示領域内の画素に対して前述の駆動を
行ったところ、下記表１に示す結果が判明した。強誘電性液晶パネル 走査電極数 ;400本 有効表示領域内の走査電極数 ;398本 その線幅 ;0.3mm 非表示領域内の走査電極数 ;2本 その線幅 ;5mm 信号電極数 ;640本 強誘電性液晶 ；チツソ社製の「CS1017」（商品名） Ｖ1及び−Ｖ2 ;V1＝15ボルト −Ｖ2＝−15ボルト ±Ｖ3 ；±Ｖ3＝±５ボルト 一走査選択期間 ;400μsec 実験温度 ;15℃ 本実施例における「ちらつき」は、20人の任意の観察
者（オペレータ）のうち全員が非表示領域のちらつきを
感じとった時を×で、半数以上が非表示領域のちらつき
を感じとった時を△で、全員が非表示領域のちらつきを
感じなかった時を○で評価した。Next, the present inventors performed the above-described driving for the pixels in the non-display area for each field scan by using the following ferroelectric liquid crystal panel and driving waveforms shown in FIG. The results shown in Table 1 below were found. Number of scanning electrodes in ferroelectric liquid crystal panel ; 400 Number of scanning electrodes in effective display area; 398 Line width; 0.3 mm Number of scanning electrodes in non-display area; 2 Line width; 5 mm Number of signal electrodes; 640 ferroelectric liquid crystal; Chitsuso manufactured by "CS1017" (trade name) V 1 and -V 2; V 1 = 15 V -V 2 = -15 volts ± V 3; ± V 3 = ± 5 volts one scanning selection period ; 400μsec experiment temperature; 15 ℃ “Flicker” in the present embodiment is indicated by “x” when all of the 20 observers (operators) feel the flicker of the non-display area, and “△” when at least half of them observe the flicker of the non-display area. Then, when all the members did not feel the flicker of the non-display area, the evaluation was made by ○.
表１によれば、３本おき走査以上で、各フイールド走
査毎に非表示領域内の走査電極の駆動を行った時には、
ちらつきはほとんど発生していないことが判明した。
又、２本おき走査の際に、各フイールド走査のうち1/2
フイールド毎に非表示領域内の走査電極の駆動を行った
ところ、やはりちらつきの発生はなかった。According to Table 1, when the scan electrodes in the non-display area are driven for every field scan in every third scan or more,
It turned out that flicker hardly occurred.
In the case of every other scan, half of each field scan
When the scan electrodes in the non-display area were driven for each field, no flickering occurred.
又、本発明者らは、第６図に示す駆動波形を用いたほ
かは、前述の実施例と同様の方法で実験を行ったとこ
ろ、前述の実施例と同様の結果が得られた。但し、第６
図に示す駆動例では、非表示領域内の走査電極ＳA及び
ＳBに、情報信号印加に依存することなく、走査電極ＳA
及びＳB上の画素を一斉に白（又は黒）の状態を形成す
ることができる非表示用電圧信号パルスを印加した。こ
の実施例で非表示用電圧信号としては、電圧波高値（−
Ｖ4）＝−20ボルト、パルス幅は有効表示領域の書込み
に使用した走査選択信号によって定まる一走査選択期間
と同じ400μsecとした。The present inventors conducted an experiment in the same manner as in the above-described embodiment except that the driving waveforms shown in FIG. 6 were used. As a result, the same results as in the above-described embodiment were obtained. However, the sixth
In the driving example shown in the figure, the scanning electrodes S A and S B in the non-display area are applied to the scanning electrodes S A without depending on the application of the information signal.
And applying a non-display voltage signal pulse capable of forming a state of white (or black) in unison pixels on S B. In this embodiment, the non-display voltage signal includes a voltage peak value (−
V 4 ) = − 20 volts, and the pulse width was 400 μsec, the same as one scanning selection period determined by the scanning selection signal used for writing in the effective display area.
本発明は、前述した駆動例の他に、例えば米国特許第
4548476号公報、米国特許第4655561号公報、米国特許第
4681404号公報、米国特許第4697887号公報、米国特許第
4709995号公報、米国特許第4712872号公報、米国特許第
4747671号公報などで明らかにされた駆動を用いること
ができる。又、本発明で用いる液晶パネルとしては、例
えば米国特許第4639089号公報、米国特許第4674839号公
報、米国特許第4682858号公報、米国特許第4709994号公
報、米国特許第4712873号公報、米国特許第4712874号公
報、米国特許第4712875号公報、米国特許第4712877号公
報、米国特許第4714323号公報などに開示された強誘電
性液晶パネルを用いることができる。The present invention, besides the above-described driving example, includes, for example, U.S. Pat.
No. 4548476, U.S. Pat.No. 4,655,561, U.S. Pat.
No. 4681404, U.S. Pat.No.4697887, U.S. Pat.
No. 4709995, U.S. Pat.No. 4,718,722, U.S. Pat.
The driving disclosed in Japanese Patent No. 4747671 can be used. Further, as the liquid crystal panel used in the present invention, for example, US Patent No. 4639089, US Patent No. 4,748,839, US Patent No. 4,682,858, US Patent No. 4,709,994, US Patent No. 4,712,873, US Patent No. The ferroelectric liquid crystal panels disclosed in US Pat. No. 4,712,874, US Pat. No. 4,712,875, US Pat. No. 4,712,877, US Pat. No. 4,714,323 can be used.
本発明によれば表示品位を向上させる表示領域駆動を
用いた時に発生していたコントラスト変動によるちらつ
きを抑制又は解消することができた。According to the present invention, it is possible to suppress or eliminate the flicker caused by the contrast fluctuation that occurs when the display area driving for improving the display quality is used.
第１図は本発明装置のブロツク図である。第２図は表示
装置の平面図である。第３図はマトリクス電極を表わし
た平面図である。第４図は本発明で用いた駆動信号を示
す波形図である。第５図及び第６図は本発明で用いた走
査信号電圧を時系列で示した波形図である。FIG. 1 is a block diagram of the apparatus of the present invention. FIG. 2 is a plan view of the display device. FIG. 3 is a plan view showing a matrix electrode. FIG. 4 is a waveform diagram showing a drive signal used in the present invention. 5 and 6 are waveform diagrams showing the scanning signal voltages used in the present invention in time series.
Claims (5)
したマトリクス電極と強誘電性液晶とを備えた液晶素子
と、該走査電極に走査選択信号を印加し該信号電極に該
走査選択信号と同期して情報信号を印加する為の第１の
手段とを有する液晶装置において、 該マトリクス電極により形成された表示画面を有効表示
領域と非表示領域とに区分け、該非表示領域内の走査電
極に印加する該走査選択信号の印加周期を、該有効表示
領域内の走査電極に印加する該走査選択信号の印加周期
より短くなるように該第１の手段を制御する為の第２の
手段を有する液晶装置。A liquid crystal element comprising a matrix electrode formed of a plurality of scanning electrodes and a plurality of signal electrodes; and a ferroelectric liquid crystal; a scanning selection signal applied to the scanning electrode; and a scanning selection signal applied to the signal electrode. A first means for applying an information signal in synchronization with the display device, wherein a display screen formed by the matrix electrodes is divided into an effective display area and a non-display area, and a scanning electrode in the non-display area is provided. A second means for controlling the first means so that an application cycle of the scan selection signal applied to the scan electrodes in the effective display area is shorter than an application cycle of the scan selection signal applied to the scan electrodes in the effective display area. Liquid crystal device.
領域内の走査電極より外側に配置され、該有効表示領域
内の走査電極より幅広である請求項１に記載の液晶装
置。2. The liquid crystal device according to claim 1, wherein the scan electrodes in the non-display area are arranged outside the scan electrodes in the effective display area and are wider than the scan electrodes in the effective display area.
したマトリクス電極と強誘電性液晶とを備えた液晶素子
と、該走査電極に走査選択信号を印加し該信号電極に該
走査選択信号と同期して情報信号を印加する為の第１の
手段と、を有する液晶装置において、 該マトリクス電極により形成された表示画面を有効表示
領域と非表示領域とに区分け、該有効表示領域内の走査
電極に対してＮ本おきに該走査選択信号を印加すること
によってＮ＋１回のフィールド走査によって該有効表示
領域内のＭ本の走査電極に該走査選択信号を印加し、該
有効表示領域内のＭ本より少ない本数の走査電極への該
走査選択信号の印加動作毎に、該非表示領域内の走査電
極に該走査選択信号を印加するように該第１の手段を制
御する第２の手段を有する液晶装置。3. A liquid crystal element comprising a matrix electrode formed of a plurality of scanning electrodes and a plurality of signal electrodes, and a ferroelectric liquid crystal, applying a scanning selection signal to the scanning electrode, and applying the scanning selection signal to the signal electrode. And a first means for applying an information signal in synchronization with the display device, wherein a display screen formed by the matrix electrodes is divided into an effective display area and a non-display area, By applying the scan selection signal every N lines to the scan electrodes, the scan selection signal is applied to the M scan electrodes in the effective display area by N + 1 field scans, and the scan selection signal in the effective display area is applied. A second means for controlling the first means so as to apply the scan selection signal to the scan electrodes in the non-display area every time the scan selection signal is applied to the scan electrodes of a number less than M; Liquid crystal device having .
電極への該走査選択信号の印加動作毎に、該非表示領域
内の走査電極に該走査選択信号を印加する請求項３に記
載の液晶装置。4. The scanning selection signal is applied to the scanning electrodes in the non-display area each time the scanning selection signal is applied to the M / (N + 1) scanning electrodes in the effective display area. 3. The liquid crystal device according to claim 1.
査電極への該走査選択信号の印加動作毎に、該非表示領
域内の走査電極に該走査選択信号を印加する請求項３に
記載の液晶装置。5. The scanning selection signal is applied to the scanning electrodes in the non-display area each time the scanning selection signal is applied to the M / 2 (N + 1) scanning electrodes in the effective display area. 4. The liquid crystal device according to 3.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20506788A JP2575189B2 (en) | 1988-08-17 | 1988-08-17 | Liquid crystal device |
| AT89115107T ATE121211T1 (en) | 1988-08-17 | 1989-08-16 | DISPLAY DEVICE. |
| ES89115107T ES2070153T3 (en) | 1988-08-17 | 1989-08-16 | DISPLAY DEVICE. |
| DE68922159T DE68922159T2 (en) | 1988-08-17 | 1989-08-16 | Display device. |
| EP89115107A EP0355693B1 (en) | 1988-08-17 | 1989-08-16 | Display apparatus |
| US08/232,584 US5526015A (en) | 1988-08-17 | 1994-04-25 | Display apparatus having a display region and a non-display region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20506788A JP2575189B2 (en) | 1988-08-17 | 1988-08-17 | Liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0253026A JPH0253026A (en) | 1990-02-22 |
| JP2575189B2 true JP2575189B2 (en) | 1997-01-22 |
Family
ID=16500881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20506788A Expired - Fee Related JP2575189B2 (en) | 1988-08-17 | 1988-08-17 | Liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2575189B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2805252B2 (en) * | 1991-02-20 | 1998-09-30 | キヤノン株式会社 | Liquid crystal device |
| JP2753928B2 (en) * | 1992-11-06 | 1998-05-20 | キヤノン株式会社 | Liquid crystal display |
| US7948464B2 (en) | 2004-09-29 | 2011-05-24 | Citizen Holdings Co., Ltd. | Memory-type liquid crystal display device |
| JP4680297B2 (en) * | 2006-03-30 | 2011-05-11 | 富士通株式会社 | Display element driving method and display device |
-
1988
- 1988-08-17 JP JP20506788A patent/JP2575189B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0253026A (en) | 1990-02-22 |
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