JPS6385525A - Color electrooptic device by ferroelectric liquid crystal - Google Patents
Color electrooptic device by ferroelectric liquid crystalInfo
- Publication number
- JPS6385525A JPS6385525A JP61230743A JP23074386A JPS6385525A JP S6385525 A JPS6385525 A JP S6385525A JP 61230743 A JP61230743 A JP 61230743A JP 23074386 A JP23074386 A JP 23074386A JP S6385525 A JPS6385525 A JP S6385525A
- Authority
- JP
- Japan
- Prior art keywords
- group
- leds
- liquid crystal
- scanning
- ferroelectric liquid
- 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.)
- Granted
Links
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 title claims abstract description 22
- 239000003086 colorant Substances 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 abstract description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 12
- 210000002858 crystal cell Anatomy 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- 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
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
-
- 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
- G09G2320/0233—Improving the luminance or brightness uniformity across the 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は強誘電性液晶カラー電気光学装置に関する。特
に強誘電性液晶を用いてｔ才時加法混色によるカラーデ
ィスプレイを提供する強誘電性液晶カラー電気光学装置
の駆動方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ferroelectric liquid crystal color electro-optical device. In particular, the present invention relates to a method for driving a ferroelectric liquid crystal color electro-optical device that uses a ferroelectric liquid crystal to provide a color display based on additive color mixing.
本発明は、強誘電性液晶素子の背面に設置された互いに
異なる色の光を発する光源から、前記強誘電性液晶素子
に継時的に異なる色の光を照射することにより加法混色
を生ぜしめる強誘電性液晶カラー電気光学装置において
、前記背面に設置された光源の点灯及び消灯のタイミン
グを、前記強誘電性液晶素子の画面書き換え時の走査信
号に同期させることによって、輝度むらのない色再現性
の良いカラー表示を得ることができるとし・うちのであ
る。The present invention generates additive color mixture by sequentially irradiating the ferroelectric liquid crystal element with light of different colors from a light source that emits light of different colors installed on the back side of the ferroelectric liquid crystal element. In a ferroelectric liquid crystal color electro-optical device, color reproduction without uneven brightness is achieved by synchronizing the timing of turning on and off the light source installed on the back side with the scanning signal when rewriting the screen of the ferroelectric liquid crystal element. In my case, I can get a good color display.
従来から液晶セルをンヤノタとして用いて、その背後に
発光素子（例えばＬＥＤ、ＣＩ？！Ｔ等）を設πして継
時加法混合の現象により、カラー表示を実現する発表は
なされている。例えばＥｕｒｏｄｉｓ−ｐｌａｙ ’８
４において発表されたＦｈｉｌｉｐ Ｂｏｓ、Ｔｈｏｍ
ａｓＢｕｚａｋ＋ Ｒｏｌｆ Ｖａｔｎｅ らの７−９
ｒ４八Ｆｕｌｌ−ｃｏｌｏｒＦｉｅｌｄ−５ｅｑｕｅｎ
ｔｉａｌ Ｃｏ１ｏｒ ＤｉｓｐｌａｙＪ （１９８４
／９／１Ｂ−２０）やＳｒＤ ’８５で発表された１ｌ
ａｓｅｂｅ 、 Ｋｏｂａｙａｓｈ ｉらの「が先行文
献としてあげられる。」しかし、同方式を、強誘電性液
晶表示素子に応用した場合の具体的な駆動方法について
の開示された発明はない。Conventionally, it has been announced that a color display is realized by using a liquid crystal cell as a light emitting device and installing a light emitting element (for example, an LED, CI?!T, etc.) behind it to achieve a color display by the phenomenon of sequential additive mixing. For example Eurodis-play '8
Philip Bos, Thom announced at 4
asBuzak+ Rolf Vatne et al.'s 7-9
r48Full-colorField-5equen
tial Co1or DisplayJ (1984
/9/1B-20) and 1l announced at SrD '85
Asebe, Kobayashi et al.'s "is cited as a prior art document." However, there is no invention disclosed regarding a specific driving method when the same method is applied to a ferroelectric liquid crystal display element.
そこで、まず従来の強誘電性液晶の駆動方法を説明する
。強誘電性液晶例えばカイラルスメクチ７り液晶（以下
Ｓｍｃ”という）分子の双安定状態を相互に電気的に切
換えて（以下スイッチングという）駆動する強誘電性液
晶セル（以下単に液晶セルという）及びその駆動回路は
特開昭６１−９４０２６に開示されている。First, a conventional method for driving a ferroelectric liquid crystal will be explained. A ferroelectric liquid crystal cell (hereinafter simply referred to as a liquid crystal cell) that is driven by electrically switching (hereinafter referred to as switching) the bistable states of ferroelectric liquid crystal molecules, such as chiral smectile liquid crystal (hereinafter referred to as "Smc"), and its driving. The circuit is disclosed in Japanese Patent Application Laid-Open No. 61-94026.
第２図に従来の液晶セルの斜視図を示す。ｉ−１は対向
配置している一対の基板である。２−２は基板内平面に
設けられた一軸性又はランダム水平配向膜である。３は
配向膜２−２によって挟まれたＳｍｃ’″薄膜である。FIG. 2 shows a perspective view of a conventional liquid crystal cell. i-1 is a pair of substrates placed opposite each other. 2-2 is a uniaxial or random horizontal alignment film provided on the inner plane of the substrate. 3 is an Smc''' thin film sandwiched between alignment films 2-2.
５ｆｆｌｃ”は本来ラセン層構造を有するが配向膜
で挟んだ薄膜にすると図に示すように液晶分子は層をな
して水平配向する。5fflc" originally has a helical layer structure, but when it is made into a thin film sandwiched between alignment films, the liquid crystal molecules form layers and are horizontally aligned as shown in the figure.
しかしながら、Ｓｍｃ″薄膜３を上部からみると分子軸
が層の法線４に対してθ傾いている。この位置は２通り
あり第１の安定状態５と第２の安定状Ｂ６である。とこ
ろでＳｍｃ”分子は分子軸に直交する向きに自発分極７
を有する。自発分極７の方向は基板１に垂直でありかつ
、双安定状態間で逆極性となっている。従って所定の極
性のパルスを印加することにより安定状態を相互にスイ
ッチングすることができる。８−８は互いに直交する偏
光軸を有する一対の偏光板であって、複屈折により液晶
分子の第１の安定状態と第２の安定状態を光通過及び光
遮断として識別する光学変換部材である。９及び１０は
対向配置された電極であり、Ｓｍｃ“に対してパルスを
印加する。However, when the Smc'' thin film 3 is viewed from above, the molecular axis is tilted by θ with respect to the layer normal 4. There are two positions for this, a first stable state 5 and a second stable state B6. Smc” molecule is spontaneously polarized in the direction perpendicular to the molecular axis7
has. The direction of the spontaneous polarization 7 is perpendicular to the substrate 1, and the polarity is reversed between the bistable states. It is therefore possible to switch between stable states by applying pulses of a predetermined polarity. 8-8 is a pair of polarizing plates having polarization axes orthogonal to each other, and is an optical conversion member that identifies the first stable state and the second stable state of liquid crystal molecules as light passing and light blocking by birefringence. . Electrodes 9 and 10 are arranged opposite to each other and apply a pulse to Smc''.
第３図に電極構成を示す。９は走査電極であり、１０は
信号電極である０両電極でｍ行ｎ列のマトリクスを構成
し周知の時分割駆動が行われる。Figure 3 shows the electrode configuration. 9 is a scanning electrode, and 10 is a signal electrode. Both electrodes form a matrix of m rows and n columns, and well-known time division driving is performed.
第４図は第３図に示すマトリクス画素の一つに印加され
る駆動波形の例である。まず最初の選択期間中闇値以上
の波高値Ｖｏｐ及びパルス幅Ｔを有する交流パルスを−
サイクル加える。全前半パルスＰ、の極性が液晶分子を
第１の安定状態から第２の安定状態にスイッチングする
方向にあると仮定すると、後半パルスＰ２の極性は逆方
向のスイッチング（第２の安定状態から第１の安定状態
へ）を行う。結果的にはＰ１パルスのスイッチングは保
持されずＰ２パルスによるスイッチングが常に有効とな
る。次に非選択期間中は闇値以下の波高値を有する交流
パルスが印加され先に得られた第１の安定状態が保存さ
れる。以下ここまでの期間を第１フレームと呼ぶ。FIG. 4 is an example of a driving waveform applied to one of the matrix pixels shown in FIG. 3. First, during the first selection period, an AC pulse having a peak value Vop and a pulse width T greater than the dark value is -
Add cycle. Assuming that the polarity of all the first half pulses P, is in the direction of switching the liquid crystal molecules from the first stable state to the second stable state, the polarity of the second half pulse P2 is in the direction of switching the liquid crystal molecules from the first stable state to the second stable state. 1) to the stable state. As a result, the switching of the P1 pulse is not maintained and the switching of the P2 pulse is always effective. Next, during the non-selection period, an AC pulse having a peak value below the dark value is applied, and the previously obtained first stable state is preserved. Hereinafter, the period up to this point will be referred to as the first frame.
次にＰ、、Ｐ、パルスを含む第２フレームでは、Ｐ、、
Ｐ、パルスの波高値は闇値以下であり、かつ第１フレー
ムに比１校して位相が反転している。従って、第１フレ
ームでＰ２パルスによって書き込まれた第１の安定状態
は保持される。Then, in the second frame containing P,,P, pulses,P,,
P, the peak value of the pulse is less than the dark value, and the phase is reversed by one point compared to the first frame. Therefore, the first stable state written by the P2 pulse in the first frame is maintained.
以上が第１の安定状態に書き込みたい画素に印加される
べき波形であるが、第２の安定状態に書き込みたい画素
については、Ｐ ｌ＋ Ｐ ｚパルスの波高値を闇値以
下に、一方Ｐ ）、 Ｐ ａパルスの波高値を闇値以上
にすれば良い。すなわち第１の安定状態にすべき画素は
第１フレームで、第２の安定状態にすべき画素は第２フ
レームで書き込むという駆動方式のため２フレ一ム分走
査することによって１画面が形成される。従って両者の
間には時間的なずれが生し、２フレーム走査した後では
、第１の安定状態の方が第２の安定状態より１フレーム
の時間分だけ長（表示されていることになる。The above is the waveform that should be applied to the pixel that you want to write to the first stable state, but for the pixel that you want to write to the second stable state, the peak value of the P l + P z pulse should be lower than the dark value, while P ) , it is sufficient to make the peak value of the P a pulse higher than the dark value. In other words, because of the drive method in which pixels that should be in the first stable state are written in the first frame, and pixels that should be in the second stable state are written in the second frame, one screen is formed by scanning two frames. Ru. Therefore, there is a time lag between the two, and after two frames have been scanned, the first stable state is longer than the second stable state by one frame (it is displayed). .
今、背面に配置せられた平面発光素子の異なった色の１
つが第５図に示されたように前記２フレームの間だけ発
光するとし、かつ第１の安定状態を光遮断状態（以下黒
と呼ぶ。）第２の安定状態を光ｉ３過状態（以下白と呼
ぶ。）とする。ここで第３図のｍ行ｎ列のマトリクス配
置されたセルの最上級（すなわち１行目）と最下段くす
なわちｍ行目）の画素を考える。いずれも以前の状態が
黒でこの２フレームの間に白に反転すべき画素だとすれ
ば、第１フレームでは黒が保持されており、第２フレー
ムで白に反転することになるが、第２フレームの終了ま
でに最上段の画素が白になっている時間は（２ｍ−１）
Ｔであり、一方、最下段の画素はＴである。ちなみにＳ
ｍｃ”のＴは２００〜３００μＳｅｃでありこの程度の
時間では、透過してくる発光色を認識することができず
、最下段の画素では、所望のカラー表示が得られないと
いう問題点がある。Now, one of the different colors of the flat light emitting elements placed on the back side.
As shown in FIG. 5, the light is emitted only during the two frames, and the first stable state is the light blocking state (hereinafter referred to as black), and the second stable state is the light i3 passing state (hereinafter referred to as white). ). Here, consider the pixels at the highest level (ie, the first row) and the lowest level (ie, the m-th row) of the cells arranged in a matrix of m rows and n columns in FIG. If the previous state of each pixel was black and should be inverted to white between these two frames, it would hold black in the first frame and invert to white in the second frame. The time that the top pixel is white until the end of 2 frames is (2m-1)
On the other hand, the bottom pixel is T. By the way, S
T of "mc" is 200 to 300 .mu.Sec, and there is a problem in that within this time period, the transmitted emitted light color cannot be recognized, and the desired color display cannot be obtained in the bottom pixel.
そこで、第６図のように各色の発光時間を第５図に比較
して１フレ一ム分だけ遅らせた方式を発明した。これに
よって最下段の画素でも最低２ｍＴ時間は光を透過させ
ることができた。Therefore, we devised a method in which the light emission time of each color is delayed by one frame compared to that shown in FIG. 5, as shown in FIG. This allowed light to pass through even the bottom pixel for at least 2 mT time.
しかし、さらにカラー表示の品位をあげようとすると次
の事が問題となってきた。今、最上段の画素が第２フレ
ームで白に書き込まれたとすると、このフレームが終了
する（２ｍ−１）Ｔの間は光が透過する。そしてさらに
前記最上段の画素が次の２フレームでも白に書き込まれ
るものだとすると、そのうちの第１フレームでは白の状
態が保持されているために、この期間でも同一の色の光
が透過してきて、合計（２ｍ−１）Ｔ＋２ｍＴ−（４ｍ
−１）Ｔの時間だけ、光が透過してくる。However, when attempting to further improve the quality of color display, the following problems have arisen. Now, if the top pixel is written white in the second frame, light will pass through for a period of (2m-1)T when this frame ends. Furthermore, if the top pixel is to be written white in the next two frames, since the white state is maintained in the first frame, light of the same color will pass through this period as well. Total (2m-1)T+2mT-(4m
-1) Light is transmitted for only time T.
一方、最下段では、前記したように最低で２ｍＴの時間
しかｉ３過してこないために、最上段と最下段ではおよ
そ２倍程度の光量差が生してしまう。On the other hand, at the lowest stage, as described above, only a minimum time of 2 mT passes through i3, so there is a difference in light intensity of approximately twice that between the uppermost stage and the lowest stage.
これは、微妙な程度むらや、色相の変化を引き起こし、
高品位のカラー表示を得ることができない。This causes slight unevenness and changes in hue,
It is not possible to obtain high-quality color display.
本発明は、従来の技術の問題点を解決することを目的と
し、平面発光素子の点灯及び消灯のタイミングを、前記
強誘電性液晶素子の画面書き換え時の走査信号に同期さ
せることによって、最上段と最下段の画素の光量差を小
さくするものである。The present invention aims to solve the problems of the conventional technology, and by synchronizing the timing of turning on and off the planar light emitting element with the scanning signal when rewriting the screen of the ferroelectric liquid crystal element, the top stage This is to reduce the difference in light amount between the pixel and the bottom pixel.
第７図に平面発光素子の平面図を示す。光拡散板１１が
前面に貼られた厘体１２内に赤、青、緑の発光ダイオー
ド１３，１４．１５ Ｃ以下ＬＥＤと呼ぶ）のチップ１
組となって分散して設置されている。FIG. 7 shows a plan view of the flat light emitting device. Red, blue, and green light-emitting diodes 13, 14. Chips 1 (hereinafter referred to as LEDs) are mounted inside a receptacle 12 with a light diffusing plate 11 pasted on the front.
They are set up in groups and distributed.
ＬＥＤが発光すると前記光拡散板によって光が拡散され
、平面全体が均一の色となって、光を照射する仕組みに
なっている。従って、強誘電性液晶素子の１画素毎にＬ
ＥＤを設置する必要はなく、むしろ拡散板の性能によっ
て均一発光になるようにＬＥＤの設置数が決められる。When the LED emits light, the light is diffused by the light diffusing plate, and the entire plane becomes a uniform color and is irradiated with light. Therefore, for each pixel of the ferroelectric liquid crystal element, L
It is not necessary to install EDs; rather, the number of LEDs to be installed is determined based on the performance of the diffuser plate so as to achieve uniform light emission.
例えば、第３図のようなｍ行×ｎ列の強誘電性液晶マト
リクスセルにおいて、１個のＬＥＤがｒ行×ｒ列の面積
を均一に発光させることができるとすると、赤、青。For example, in a ferroelectric liquid crystal matrix cell with m rows and n columns as shown in FIG. 3, if one LED can emit light uniformly over an area of r rows and r columns, red and blue light will be emitted.
緑のＬＥＤが各ｍＸｎ＋ｒ２個だけ設置されるわけであ
る。金策７図において最上段のＬＥＤから最下段のＬ
Ｅ Ｄまでをａ群、ｂ群、Ｃ群−＝と呼ぶ。Two green LEDs are installed for each mXn+r. In Figure 7, from the top LED to the bottom L
The groups up to E D are called group a, group b, and group C.
従って、ｍ行のマトリクス画素のうち、最上段からｒ行
だけの画素はａ群のＬＥＤによって照射され、次のｒ行
の画素は、ｂ群のＬ Ｅ Ｄによって照射されるわけで
あり、以下同様である。Therefore, among the m rows of matrix pixels, the pixels in only r rows from the top row are illuminated by the LEDs of group a, and the pixels in the next r row are illuminated by the LEDs of group b. The same is true.
今、第１図のようなタイミングで各群のＬＥＤを点灯も
しくは消灯する。（但し図ではａ、ｂ。Now, the LEDs in each group are turned on or off at the timing shown in Figure 1. (However, in the figure, a and b.
Ｃの３群のみを図示している。）即ち、第２フレームか
ら次のフレームに渡って単色のＬＥＤを点灯する方式は
第６図と同様であるが、第１図においては、さらにａ群
、ｂ群、Ｃ群−−−一−−と順次に点灯及び消灯をさせ
る。すなわち、第２フレームの開始と同時にａ群のＬＥ
Ｄのみを点灯させる。その後液晶素子の走査電極ｌＯの
走査がｒ行だけ進んだ後、ｂ群のＬＥＤも点灯させる。Only three groups of C are shown. ) That is, the method of lighting a single color LED from the second frame to the next frame is the same as that shown in FIG. 6, but in FIG. - and turn on and off in sequence. That is, at the same time as the start of the second frame, the LE of group a
Light up only D. Thereafter, after the scanning of the scanning electrode IO of the liquid crystal element advances by r rows, the LEDs of group b are also turned on.
さらに走査が次の１ｒ行だけ進んだ後にＣ群のＬＥＤも
点灯させる。以下同様にして最下段のＬＥＤまで点灯さ
せる。さて、第２フレームの走査が終了し走査が再び最
上段の画素に戻る直前で前記ａ群のＬＥＤを消灯させる
。そして最上段からｒ行走査した直後にｂ群のＬＥＤを
消灯させ、さらにｒ行の走査が終了した時点でＣ群のＬ
ＥＤを消灯させる。以下同様に最下段からｒ行手１１」
の走査が終了した時点で最下段の群のＬＥＤを消灯させ
る。Furthermore, after the scanning has progressed by the next 1r rows, the LEDs of group C are also turned on. Thereafter, in the same manner, all the LEDs up to the bottom row are lit. Now, just before the scanning of the second frame ends and the scanning returns to the top pixel again, the LEDs of group a are turned off. Immediately after scanning r rows from the top row, the LEDs of group B are turned off, and when the scanning of rows r is completed, the LEDs of group C are turned off.
Turn off the ED. Similarly, from the bottom row R row 11"
When scanning is completed, the LEDs in the bottom group are turned off.
この方式によれば、Ｌ Ｅ Ｄの点灯している時間は、
どの群も２ｍＴの時間であり、しかもこの時間は画像情
報が書き込まれてそれを保持している時間にほぼ等しい
。例えば、期間への第２フレームで最上段の画素が白に
書き込まれたとする。この状態は（２ｍ−１）Ｔの時間
保持される。走査が次のフレームにはいる期間Ｂでは、
最上段に青の画像情報が書き込まれてしまうが、この時
にはａ群のＬＥＤは消灯している。−力量下段の画素に
ついては、第２フレームの最終走査で赤の画像情報が書
き込まれるので、それまでは、赤色ＬＥＤを点灯してい
る必要はなく、反対に次のフレームでは、最下段の走査
が行われない以前には、赤色画面情報が保持されている
わけで、この保持期間はやはり（２ｍ−１）Ｔである。According to this method, the time the LED is lit is
The time for each group is 2 mT, and this time is approximately equal to the time that image information is written and retained. For example, assume that the topmost pixel is written white in the second frame of the period. This state is maintained for a time of (2m-1)T. In period B, when scanning begins in the next frame,
Blue image information is written in the top row, but at this time the LEDs in group a are off. - Since red image information is written to the pixels in the lower row of power in the final scan of the second frame, there is no need to turn on the red LED until then; on the other hand, in the next frame, the pixels in the bottom row Before this is performed, the red screen information is held, and this holding period is also (2m-1)T.
しかし、画像保持期間は全て（２ｍ−１）Ｔであるが、
光の透過時間は、各群のＬＥＤが照射する走査電極行数
ｒのうちの最上段と最下段では異なることにン主意しな
ければならない、すなわち、例えばａ群の照射する走査
行数ｒのうちの最上段と最下段についてｉ！過待時間計
算すると最上段では（２ｍ−１）Ｔであり、最下段では
［２（ｍ−ｒ）＋１１ Ｔである。ｒを大きくすると、
両者の光量には差が出てきてしまい輝度むらの原因にな
るが、ｒを適当な値に選んでやれば実際上、見た目に輝
度むらは感じられない。However, although the image retention period is (2m-1)T in all cases,
It must be kept in mind that the light transmission time is different between the top and bottom rows of the number r of scanning electrode rows irradiated by the LEDs of each group. For example, About my top and bottom tiers! Calculating the waiting time is (2m-1)T at the top and [2(m-r)+11T at the bottom. When r is increased,
There will be a difference in the amount of light between the two, which will cause uneven brightness, but if r is chosen to an appropriate value, the uneven brightness will not be visually noticeable.
〔発明の効果〕
以上述べたように本発明によれば、各色光の強誘電性液
晶素子を透過する光量を、はぼ一定にすることができる
ため、輝度や色相のむらのないカラー表示を得ることが
できるという効果がある。[Effects of the Invention] As described above, according to the present invention, the amount of light transmitted through the ferroelectric liquid crystal element for each color light can be made almost constant, so that a color display without uneven brightness or hue can be obtained. It has the effect of being able to
第１図は本発明のＳｍｃ”の駆動タイミングと平面発光
素子の発光タイミングとを継時的に表した図、第２図は
従来の液晶セルの斜視図、第３図は従来の液晶セルの電
極配置図、第４図は従来の液晶セルの駆動波形図、第５
図は従来の５ＩＩＩＣ″の駆動タイミングと平面発光素
子の発光タイミングとを継時的に表した図、第６図は従
来の方式を改良したＳｍｃ”の駆動タイミングと平面発
光素子の発光タイミングとを継時的に表した図、第７図
は平面発光素子の構造を表した一部断面斜視図である。
１１・・・光拡散板 １２ ・・・国体１３・・・
赤色ＬＥＤチップ
１４・・・青色ＬＥＤチップ
１５・・・緑色ＬＥＤチップ
以上
従来の液に’伍ルー余十乎克図
第 ２ ■
ルら友のメ場晶セノしのＱ不臥ρこ１図第３図
今芝未ｆ１５裔１１−七乙ＩしΦ４２重力、已安”汀う
第４図
］ン
干ｌ老九を壬の−ｑ−咋釦糾投図
第７図Fig. 1 is a diagram chronologically showing the drive timing of the Smc'' of the present invention and the light emission timing of the flat light emitting element, Fig. 2 is a perspective view of a conventional liquid crystal cell, and Fig. 3 is a diagram of a conventional liquid crystal cell. Electrode arrangement diagram, Figure 4 is a driving waveform diagram of a conventional liquid crystal cell, Figure 5
The figure shows the drive timing of the conventional 5IIIC" and the light emission timing of the flat light emitting element over time. Figure 6 shows the drive timing of the conventional 5IIIC" and the light emission timing of the flat light emitting element. FIG. 7 is a partially sectional perspective view showing the structure of a flat light emitting device. 11...Light diffusion plate 12...National polity 13...
Red LED chip 14...Blue LED chip 15...Green LED chip or more Fig. 3 Imashiba Mi f15 descendant 11-Nanao I and Φ42 gravity, Hasan "falling Fig. 4]
Claims (1)
なる強誘電性液晶素子と、この表示画面に互いに異なる
色の光を継時的に照射することができる複数の光源より
なる平面光源とを具備した強誘電性液晶カラー電気光学
装置において、前記強誘電性液晶素子に印加される走査
信号によって選択状態にある画素を照射する単一もしく
は複数の光源を、前記選択状態において点灯または消灯
することを特徴とした強誘電性液晶カラー電気光学装置
。A ferroelectric liquid crystal element consisting of a ferroelectric liquid crystal thin film sandwiched between two transparent members, and a flat light source consisting of a plurality of light sources that can sequentially irradiate the display screen with light of different colors. In a ferroelectric liquid crystal color electro-optical device comprising: a scanning signal applied to the ferroelectric liquid crystal element, a single or plural light sources that illuminate a pixel in a selected state are turned on or off in the selected state; A ferroelectric liquid crystal color electro-optical device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61230743A JP2518625B2 (en) | 1986-09-29 | 1986-09-29 | Ferroelectric liquid crystal color electro-optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61230743A JP2518625B2 (en) | 1986-09-29 | 1986-09-29 | Ferroelectric liquid crystal color electro-optical device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6385525A true JPS6385525A (en) | 1988-04-16 |
| JP2518625B2 JP2518625B2 (en) | 1996-07-24 |
Family
ID=16912601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61230743A Expired - Lifetime JP2518625B2 (en) | 1986-09-29 | 1986-09-29 | Ferroelectric liquid crystal color electro-optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2518625B2 (en) |
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|---|---|---|---|---|
| JPH08194207A (en) * | 1995-01-20 | 1996-07-30 | Olympus Optical Co Ltd | Image display device |
| WO1999049358A1 (en) * | 1998-03-26 | 1999-09-30 | Mitsubishi Denki Kabushiki Kaisha | Image display and light-emitting device |
| WO2000008518A1 (en) | 1998-08-06 | 2000-02-17 | Citizen Watch Co., Ltd. | Ferroelectric liquid crystal display and method for driving the same |
| WO2000074390A1 (en) * | 1999-05-27 | 2000-12-07 | Globalpatent Consulting Gmbh | Colour image projector with time-controlled led-light sources |
| US6828954B2 (en) | 1998-11-13 | 2004-12-07 | Fujitsu Limited | Liquid crystal display device |
| WO2005106576A1 (en) * | 2004-04-30 | 2005-11-10 | Fujitsu Limited | Liquid crystal display |
| WO2006103746A1 (en) * | 2005-03-29 | 2006-10-05 | Fujitsu Limited | Liquid crystal display |
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| WO1999049358A1 (en) * | 1998-03-26 | 1999-09-30 | Mitsubishi Denki Kabushiki Kaisha | Image display and light-emitting device |
| WO2000008518A1 (en) | 1998-08-06 | 2000-02-17 | Citizen Watch Co., Ltd. | Ferroelectric liquid crystal display and method for driving the same |
| US6828954B2 (en) | 1998-11-13 | 2004-12-07 | Fujitsu Limited | Liquid crystal display device |
| US7233304B1 (en) | 1999-03-23 | 2007-06-19 | Hitachi, Ltd. | Liquid crystal display apparatus |
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