JPS6217730B2 - - Google Patents
Info
- Publication number
- JPS6217730B2 JPS6217730B2 JP55072764A JP7276480A JPS6217730B2 JP S6217730 B2 JPS6217730 B2 JP S6217730B2 JP 55072764 A JP55072764 A JP 55072764A JP 7276480 A JP7276480 A JP 7276480A JP S6217730 B2 JPS6217730 B2 JP S6217730B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- dynamic scattering
- display element
- scattering mode
- 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
Links
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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F1/13476—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which at least one liquid crystal cell or layer assumes a scattering state
Landscapes
- Physics & Mathematics (AREA)
- Liquid Crystal (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】
本発明は液晶表示装置、特に反射モードおよび
透過モードの両表示機能の切り換えによるコント
ラスト比の低下を改善した液晶表示装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device, and particularly to a liquid crystal display device that improves the reduction in contrast ratio caused by switching between display functions in reflective mode and transmissive mode.
一般に液晶表示装置は、第１図に要部断面図で
示したように透光性ガラス板からなる上、下基板
１，２の対向にそれぞれ透明導電膜からなる上、
下電極３，４を被着形成し、周縁部をスペーサを
含有したシール材５で封着して構成された外囲器
６の中に液晶７を封入して液晶表示素子８を構成
し、この液晶表示素子８の上、下電極３，４間の
液晶７の光学的性質を変化させ、この変化を下基
板２の外面に反射板９を配置して上基板１側から
認識するように構成されている。 In general, a liquid crystal display device consists of an upper substrate made of a transparent glass plate and a lower substrate 1, 2 each made of a transparent conductive film, which are opposite to each other, as shown in a sectional view of the main part in FIG.
A liquid crystal display element 8 is constructed by enclosing a liquid crystal 7 in an envelope 6 formed by depositing the lower electrodes 3 and 4 and sealing the periphery with a sealing material 5 containing a spacer, The optical properties of the liquid crystal 7 between the upper and lower electrodes 3 and 4 of the liquid crystal display element 8 are changed, and this change is recognized from the upper substrate 1 side by disposing a reflector 9 on the outer surface of the lower substrate 2. It is configured.
しかしながら上記構成による液晶表示装置にお
いて、上、下基板１，２の対向面にそれぞれ上、
下電極３，４を形成し、液晶７を封入して構成さ
れた液晶表示素子を透過形および反射形として共
用する場合、液晶表示素子の背面に半透過形の光
反射板９を配置するため、両者のコントラストが
それぞれ犠性になるという欠点があつた。 However, in the liquid crystal display device having the above configuration, the upper and lower substrates 1 and 2 have upper and lower substrates on opposing surfaces, respectively.
When a liquid crystal display element configured by forming lower electrodes 3 and 4 and enclosing a liquid crystal 7 is used as both a transmissive type and a reflective type, a semi-transmissive light reflection plate 9 is arranged on the back side of the liquid crystal display element. However, the disadvantage was that the contrast between the two became a sacrifice.
このような欠点を改善したものとしては、機械
的に光反射板９を脱着させる機能を備えた液晶表
示装置が提案されている。しかしながら、このよ
うな構成による液晶表示装置は、光反射板９を脱
着させる機能を備えるスペース的な点と光反射板
９の液晶表示素子に対する密着性の点で問題が多
く、実用化することは技術的に極めて困難であつ
た。 In order to overcome these drawbacks, a liquid crystal display device having a function of mechanically attaching and detaching the light reflecting plate 9 has been proposed. However, a liquid crystal display device with such a configuration has many problems in terms of space required for attaching and detaching the light reflecting plate 9 and in terms of adhesion of the light reflecting plate 9 to the liquid crystal display element, and it is difficult to put it into practical use. It was technically extremely difficult.
したがつて本発明は、液晶表示素子の反射形お
よび透過形の表示機能の切り換えによつて生じる
コントラスト比の低下を改善した液晶表示装置を
提供することを目的としている。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid crystal display device in which a reduction in contrast ratio caused by switching between a reflective type and a transmissive type display function of a liquid crystal display element is improved.
また、本発明の他の目的は、光反射板の脱着機
構のスペースおよび密着性の問題を改善した液晶
表示装置を提供することを目的としている。 Another object of the present invention is to provide a liquid crystal display device in which the problem of space and adhesion of a light reflecting plate attachment/detachment mechanism is improved.
このような目的を達成するために本発明は、液
晶表示素子の外面に動的散乱モードセルを配設
し、この動的散乱モードセルの対向内面に形成さ
れた透明電極間に所定の電圧を印加し、この電圧
をコントロールすることによつて、動的散乱モー
ドセルを透明状態および動的散乱状態にさせ、透
過、反射形の両機能を持たせたものである。以下
図面を用いて本発明を詳細に説明する。 In order to achieve such an object, the present invention provides a dynamic scattering mode cell on the outer surface of a liquid crystal display element, and applies a predetermined voltage between transparent electrodes formed on the opposing inner surfaces of the dynamic scattering mode cell. By applying this voltage and controlling this voltage, the dynamic scattering mode cell is brought into a transparent state and a dynamic scattering state, and has both transmission and reflection functions. The present invention will be explained in detail below using the drawings.
第２図は本発明による液晶表示装置の一例を示
す要部断面図であり、第１図と同記号は同一要素
となるのでその説明は省略する。同図において、
液晶表示素子８、つまり下基板２の背面側には、
透光性ガラス板からなる対向基板１０，１１の対
向面全面に透明導電膜からなる対向電極１２，１
３を被着形成し、周縁部をスペーサ入りシール材
５で封着して構成された外囲器１４の中に動的散
乱現象を起させて白濁化するネマチツク液晶１５
を封入して構成された動的散乱モードセル１６を
配設されている。この場合、この動的散乱モード
セル１６はその上面、つまり対向基板１０の上面
に例えばAl2O3、TiO2、ZrO2、MgO、Cr2O3等か
ら選択された白色顔料を塗布して形成された白色
拡散膜１７が配置されて上記下基板２の背面に密
着配置されている。また、この場合、上記白色拡
散膜１７は光透過率が約50％以上となるような膜
厚に塗布形成されている。さらに、この動的散乱
モードセル１６の対向電極１２，１３間には電源
１８とこの電源電圧をオン、オフにコントロール
するスイツチ１９とが直列に接続されている。ま
た、この動的散乱モードセル１６の背面には半透
過性の光反射膜２０が蒸着して形成され、さら
に、この光反射膜２０の背面には透過形として用
いる光源２１が近接して配置されている。 FIG. 2 is a sectional view of a main part showing an example of a liquid crystal display device according to the present invention, and since the same symbols as in FIG. 1 represent the same elements, a description thereof will be omitted. In the same figure,
On the back side of the liquid crystal display element 8, that is, the lower substrate 2,
Counter electrodes 12 and 1 made of transparent conductive films are provided on the entire opposing surfaces of counter substrates 10 and 11 made of translucent glass plates.
A nematic liquid crystal 15 which causes a dynamic scattering phenomenon to become cloudy in an envelope 14 formed by adhering 3 and sealing the periphery with a sealing material 5 containing a spacer.
A dynamic scattering mode cell 16 configured by enclosing a dynamic scattering mode cell 16 is disposed. In this case, the dynamic scattering mode cell 16 is coated with a white pigment selected from Al 2 O 3 , TiO 2 , ZrO 2 , MgO, Cr 2 O 3 , etc. on its upper surface, that is, the upper surface of the counter substrate 10 . The formed white diffusion film 17 is placed in close contact with the back surface of the lower substrate 2. Further, in this case, the white diffusion film 17 is coated to a thickness such that the light transmittance is about 50% or more. Further, a power supply 18 and a switch 19 for controlling the power supply voltage on and off are connected in series between the opposing electrodes 12 and 13 of the dynamic scattering mode cell 16. Further, a semi-transparent light reflection film 20 is deposited on the back surface of the dynamic scattering mode cell 16, and a light source 21 used as a transmissive type is placed close to the back surface of the light reflection film 20. has been done.
このように構成された液晶表示装置において、
液晶表示素子８の背面に白色拡散膜１７を介して
密着配置された動的散乱モードセル１６の対向電
極１２，１３間にスイツチ１９をオンして電源１
８からネマチツク液晶１５に所定の電圧、すなわ
ち動的散乱現象が生じるしきい値電圧以上の電圧
が印加されると、ネマチツク液晶１５が動的散乱
現象を発生して動的散乱モードセル１６全面が白
濁化する。そして、液晶表示素子８の前面側から
入射した光は白色拡散膜１７と、上記動的散乱モ
ードセル１６の白濁層と、光反射膜２０とによつ
て上記液晶表示素子８の前面方向に拡散的に反射
されるので、液晶表示素子８の反射板としての機
能が得られる。この場合、反射率は約80％以上に
達し、反射モードとして明るい表示が実現でき
る。 In the liquid crystal display device configured in this way,
The switch 19 is turned on between the opposing electrodes 12 and 13 of the dynamic scattering mode cell 16, which is disposed in close contact with the back surface of the liquid crystal display element 8 via the white diffusion film 17, and the power source 1 is turned on.
When a predetermined voltage, that is, a voltage equal to or higher than the threshold voltage at which a dynamic scattering phenomenon occurs, is applied to the nematic liquid crystal 15 from 8, the nematic liquid crystal 15 generates a dynamic scattering phenomenon, and the entire surface of the dynamic scattering mode cell 16 is It becomes cloudy. The light incident from the front side of the liquid crystal display element 8 is diffused toward the front side of the liquid crystal display element 8 by the white diffusion film 17, the cloudy layer of the dynamic scattering mode cell 16, and the light reflection film 20. Since the light is reflected symmetrically, the liquid crystal display element 8 can function as a reflecting plate. In this case, the reflectance reaches approximately 80% or more, and a bright display can be achieved in reflective mode.
次に、スイツチ１９をオフにすると、対向電極
１２，１３間には電圧が印加されなくなるので、
ネマチツク液晶１５は透明状態となる。したがつ
て、液晶表示素子８には、光源２１から照射され
た光が半透過性を有する光反射板２０、動的散乱
モードセル１６、白色拡散膜１７をそれぞれ透過
し、白色拡散膜１７により拡散して前面方向に入
射されることになり、液晶表示素子８の光透過板
としての機能が得られる。この場合、透過率は綜
合して約50％以上に達し、透過モードとして実用
上充分に明るい表示が得られた。 Next, when the switch 19 is turned off, no voltage is applied between the opposing electrodes 12 and 13, so
The nematic liquid crystal 15 becomes transparent. Therefore, in the liquid crystal display element 8, the light irradiated from the light source 21 is transmitted through the semi-transparent light reflection plate 20, the dynamic scattering mode cell 16, and the white diffusion film 17, and is reflected by the white diffusion film 17. The light is diffused and incident in the front direction, so that the function of the liquid crystal display element 8 as a light transmitting plate is obtained. In this case, the total transmittance reached approximately 50% or more, and a display bright enough for practical use in the transmission mode was obtained.
なお、上記実施例において、動的散乱モードセ
ル１６の背面に半導光性の光反射膜２０を設けた
場合について説明したが、この光反射膜２０の代
りに、その上面側に被着形成された白色拡散膜１
７を設けても前述と同様の効果が得られた。 In the above embodiment, the case where the semi-light-guiding light reflecting film 20 is provided on the back surface of the dynamic scattering mode cell 16 has been described, but instead of this light reflecting film 20, it is possible to form an adhesive on the upper surface side of the dynamic scattering mode cell 16. white diffusion film 1
Even if 7 was provided, the same effect as described above was obtained.
また、本発明による液晶表示装置に用いるパタ
ーン表示側の液晶表示素子８の液晶は、ツイスト
ネマチツク形液晶、ゲストホスト形液晶および相
転移ゲストホスト形液晶等を採用することによつ
て、透過、反射モードの両表示機能を可能にし、
そのモード切り換えによる両表示のコントラスト
比をほぼ同等に改善することができる。 Further, the liquid crystal of the liquid crystal display element 8 on the pattern display side used in the liquid crystal display device according to the present invention is a twisted nematic type liquid crystal, a guest host type liquid crystal, a phase change guest host type liquid crystal, etc. Enables both display functions in reflective mode,
By switching the mode, the contrast ratios of both displays can be improved to almost the same level.
以上説明したように本発明による液晶表示装置
は、液晶表示素子の外面に動的散乱モードセルを
配設し、この動的散乱モードセルの対向内面に形
成された透明電極間に所定の電圧を印加し、この
電圧をコントロールすることによつて、透明、反
射板としての機能が得られるとともに、透過形お
よび反射形の使用に対してほぼ同等のコントラス
トが得られる。また、この動的散乱モードセルは
厚さが液晶セルと同程度に極めて薄く構成できる
ので、従来の光反射板のスペースおよび密着配置
等の問題が皆無となるなどの極めて優れた効果が
得られる。 As explained above, the liquid crystal display device according to the present invention has a dynamic scattering mode cell disposed on the outer surface of the liquid crystal display element, and a predetermined voltage is applied between the transparent electrodes formed on the opposing inner surface of the dynamic scattering mode cell. By applying this voltage and controlling this voltage, it is possible to obtain a function as a transparent, reflective plate, and to obtain approximately the same contrast for use in transmission type and reflection type. In addition, since this dynamic scattering mode cell can be configured to be extremely thin, with a thickness comparable to that of a liquid crystal cell, extremely excellent effects can be obtained, such as eliminating the problems of conventional light reflectors such as space and close placement. .
第１図は従来の液晶表示装置の一例を示す要部
断面図、第２図は本発明による液晶表示装置の一
例を示す要部断面図である。
１……上基板、２……下基板、３……上電極、
４……下電極、５……シール材、６……外囲器、
７……液晶、８……液晶表示素子、９……反射
板、１０，１１……対向基板、１２，１３……対
向電極、１４……外囲器、１５……ネマチツク液
晶、１６……動的散乱モードセル、１７……白色
拡散膜、１８……電源、１９……スイツチ、２０
……光反射膜、２１……光源。
FIG. 1 is a sectional view of a main part of an example of a conventional liquid crystal display device, and FIG. 2 is a sectional view of a main part of an example of a liquid crystal display device according to the present invention. 1... Upper substrate, 2... Lower substrate, 3... Upper electrode,
4... Lower electrode, 5... Seal material, 6... Envelope,
7...Liquid crystal, 8...Liquid crystal display element, 9...Reflector, 10, 11...Counter substrate, 12, 13...Counter electrode, 14...Envelope, 15...Nematic liquid crystal, 16... Dynamic scattering mode cell, 17... White diffusion film, 18... Power supply, 19... Switch, 20
...Light reflective film, 21...Light source.
Claims (1)
被着形成された透光性基板間に液晶を封入してな
る液晶表示素子と、前記液晶表示素子の外面に配
置されかつ対向内面に全面に透明電極が被着形成
された透光性基板間に動的散乱現象を呈する液晶
を封入してなる動的散乱モード液晶表示素子と、
前記動的散乱モード液晶表示素子の外面の少なく
とも一面に被着形成された白色光拡散膜とを備
え、前記動的散乱モード液晶表示素子の透明電極
間に印加する電圧をコントロールすることによつ
て、透過、反射の両機能を可能にしたことを特徴
とする液晶表示装置。1. A liquid crystal display element in which a liquid crystal is sealed between transparent substrates having transparent electrodes formed on opposing surfaces in accordance with a display pattern; A dynamic scattering mode liquid crystal display element comprising a liquid crystal exhibiting a dynamic scattering phenomenon sealed between a transparent substrate having a transparent electrode adhered thereto;
A white light diffusing film is formed on at least one outer surface of the dynamic scattering mode liquid crystal display element, and the voltage applied between the transparent electrodes of the dynamic scattering mode liquid crystal display element is controlled. , a liquid crystal display device characterized by having both transmission and reflection functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7276480A JPS57610A (en) | 1980-06-02 | 1980-06-02 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7276480A JPS57610A (en) | 1980-06-02 | 1980-06-02 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57610A JPS57610A (en) | 1982-01-05 |
| JPS6217730B2 true JPS6217730B2 (en) | 1987-04-20 |
Family
ID=13498753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7276480A Granted JPS57610A (en) | 1980-06-02 | 1980-06-02 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57610A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2597641B1 (en) * | 1986-04-22 | 1989-12-08 | Thomson Csf | DEVICE FOR MODULATING THE ILLUMINATION LIGHT OF AN ELECTRO-OPTICAL DISPLAY SCREEN |
| US5283563A (en) * | 1990-03-20 | 1994-02-01 | General Electric Company | Backlighting of nematic curvilinear aligned phase liquid crystal display panels |
| US5831698A (en) * | 1996-08-20 | 1998-11-03 | International Business Machines Corporation | Electrically variable diffuser |
| JP2004061907A (en) * | 2002-07-30 | 2004-02-26 | Koninkl Philips Electronics Nv | Semitransmissive liquid crystal display |
| WO2008053724A1 (en) * | 2006-11-02 | 2008-05-08 | Sharp Kabushiki Kaisha | Liquid crystal display device and television receiver |
| CN104094167B (en) * | 2012-01-30 | 2017-06-06 | 索尼移动通讯有限公司 | Electronical display projecting subassembly with basic white screen closed mode |
-
1980
- 1980-06-02 JP JP7276480A patent/JPS57610A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57610A (en) | 1982-01-05 |
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