JPH11295704A - Display device - Google Patents
Display deviceInfo
- Publication number
- JPH11295704A JPH11295704A JP9776798A JP9776798A JPH11295704A JP H11295704 A JPH11295704 A JP H11295704A JP 9776798 A JP9776798 A JP 9776798A JP 9776798 A JP9776798 A JP 9776798A JP H11295704 A JPH11295704 A JP H11295704A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- light source
- display device
- display element
- 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
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 52
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 25
- 230000005684 electric field Effects 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000003098 cholesteric effect Effects 0.000 description 2
- 239000004815 dispersion polymer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、近傍に光源を有す
る表示装置に関する。The present invention relates to a display device having a light source in the vicinity.
【０００２】[0002]
【従来の技術】近年表示素子として受光型が広く使われ
ており、その代表例が液晶表示素子である。低消費電力
であることがその理由であり、特に携帯機器用途のほと
んどに液晶表示素子が使われていることは、そのことを
裏づけている。しかし、受光型ゆえに暗い所では表示が
見えにくくなる。携帯機器の場合、夜の屋外での使用が
避け得ないため、その対策として液晶表示素子の近傍に
光源を設けた、いわゆるバックライト付液晶表示素子が
使われている。2. Description of the Related Art In recent years, a light receiving type has been widely used as a display element, and a typical example thereof is a liquid crystal display element. The reason for this is low power consumption, and the fact that liquid crystal display elements are used in most of mobile device applications supports this fact. However, the display is difficult to see in a dark place because of the light receiving type. In the case of a portable device, since it is inevitable to use the device outdoors at night, a so-called backlit liquid crystal display device having a light source provided in the vicinity of the liquid crystal display device is used as a countermeasure.
【０００３】バックライトの方式としては、図5の如く
ＥＬ等の面光源３を液晶表示素子１の背面に設置したタ
イプと、図６の如く導光板9の横にＬＥＤやタングステ
ンランプ、蛍光管等の点または線光源8を置き、該導光
板の上方に液晶表示素子1を設置したタイプが使われて
いる。前者は薄型で均一な発光が得られるが、ＥＬ自身
の寿命が低いこととＥＬを発光させるためにインバ−タ
が必要だというデメリットがある。後者は直流電圧で点
灯できるメリットがあるが、導光板の厚さが必要であ
り、また均一な発光を得ることが難しい。従って、目
的、用途によって使い分けされているのが現状である。As a backlight system, there is a type in which a surface light source 3 such as an EL is installed on the back of a liquid crystal display element 1 as shown in FIG. 5, and an LED, a tungsten lamp or a fluorescent tube beside a light guide plate 9 as shown in FIG. Such a type is used in which a point or line light source 8 is placed and the liquid crystal display element 1 is placed above the light guide plate. The former provides a thin and uniform light emission, but has the disadvantage that the life of the EL itself is short and that an inverter is required to emit the EL. The latter has the merit that it can be turned on by a DC voltage, but requires the thickness of the light guide plate, and it is difficult to obtain uniform light emission. Therefore, it is presently used depending on the purpose and application.
【０００４】また、バックライト付液晶表示素子の場合
には、図5および6の如く液晶表示素子1に半透過型の反
射板を7貼り付けて使われる。明るい環境下では光を反
射させ、暗い環境下では背面にあるバックライトの光を
透過させるためである。In the case of a liquid crystal display device with a backlight, a semi-transmissive reflector 7 is attached to the liquid crystal display device 1 as shown in FIGS. This is because light is reflected in a bright environment, and light from a backlight on the back is transmitted in a dark environment.
【０００５】[0005]
【発明が解決しようとする課題】上述したように、暗い
場所での表示素子の視認性向上のためにバックライトが
使われているが、より視認性を向上させるためには、周
囲の明るさ（暗さ）の度合いによってバックライトの輝
度を変えることが望ましい。また、バックライト型液晶
表示装置に使われている半透過型反射板は、半透過であ
るがゆえに光の透過率が低く、バックライトの利用効率
が低いという欠点を有する。As described above, a backlight is used to improve the visibility of a display element in a dark place. However, in order to further improve the visibility, the surrounding brightness is reduced. It is desirable to change the luminance of the backlight depending on the degree of (darkness). Further, the transflective reflector used in the backlight type liquid crystal display device has a defect that the transmissivity of the light is low and the utilization efficiency of the backlight is low because of the transflectiveness.
【０００６】[0006]
【課題を解決するための手段】上述した課題を解決する
ために、本発明は、表示素子とこの表示素子を照明する
光源との間に光散乱型の液晶素子2を設けることとし
た。光散乱型の液晶素子の液晶に印加する電界を変える
ことにより該液晶素子の透過率を変化させて、光源から
の光量を可変にしたものである。In order to solve the above-mentioned problems, the present invention provides a light scattering type liquid crystal element 2 between a display element and a light source illuminating the display element. By changing the electric field applied to the liquid crystal of the light-scattering type liquid crystal element, the transmittance of the liquid crystal element is changed, and the amount of light from the light source is made variable.
【０００７】この方法により、容易にバックライトの輝
度調整を行うことができる。また、光散乱型であるた
め、光のロスが少なく、図３の如く印加電圧を変えるこ
とにより透過率を３％から８５％の幅広い範囲で調整す
ることが可能である。更には、光散乱型のため反射板と
しての代用ができ、従来必要であった半透過型の反射板
を除くことができる。従って、該反射板でのバックライ
トの光の損失を除去でき、バックライトの利用効率を最
大限にすることができる。According to this method, the brightness of the backlight can be easily adjusted. Further, since the light scattering type is used, light loss is small, and the transmittance can be adjusted in a wide range from 3% to 85% by changing the applied voltage as shown in FIG. Furthermore, since it is a light scattering type, it can be used as a reflection plate, and a conventionally required transflective reflection plate can be eliminated. Therefore, the loss of light of the backlight at the reflector can be eliminated, and the efficiency of use of the backlight can be maximized.
【０００８】光散乱型の液晶素子としては、ポリマ−ネ
ットワ−ク型液晶素子（ＰＮ-ＬＣＤ）、高分子分散型
液晶素子（ＰＤ-ＬＣＤ）、コレステリック・ネマチッ
ク相転移型液晶素子（Ｃｈ-ＮＰＴ）および動的散乱型
液晶素子（ＤＳＭ）等が使用でき、いずれも同様の効果
を得ることが可能であるが、通常の環境下では、光散乱
状態にして反射板として使うため、消費電力低減のため
電圧無印加時が光散乱状態である表示素子が望ましい。
この目的のためには、高分子分散型液晶素子またはコレ
ステリック・ネマチック相転移型液晶素子が適合する。[0008] As the light scattering type liquid crystal element, a polymer network type liquid crystal element (PN-LCD), a polymer dispersion type liquid crystal element (PD-LCD), a cholesteric nematic phase transition type liquid crystal element (Ch-NPT). ) And a dynamic scattering type liquid crystal element (DSM) can be used, and the same effect can be obtained in any case. However, in a normal environment, the light scattering state is used as a reflector, so that power consumption is reduced. Therefore, a display element which is in a light scattering state when no voltage is applied is desirable.
For this purpose, a polymer dispersion type liquid crystal element or a cholesteric nematic phase transition type liquid crystal element is suitable.
【０００９】[0009]
【発明の実施の形態】本発明による表示装置は、図1に
示すように、表示素子１と光源３との間に光散乱型の液
晶素子2を備えている。液晶素子の液晶に印加する電界
を変えることにより該液晶素子の透過率を変化させて、
バックライトからの光量を可変にしたものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to the present invention comprises a light-scattering type liquid crystal element 2 between a display element 1 and a light source 3, as shown in FIG. By changing the electric field applied to the liquid crystal of the liquid crystal element, the transmittance of the liquid crystal element is changed,
The amount of light from the backlight is variable.
【００１０】以下本発明の実施例を具体的に説明する。 （実施例1）本発明に用いる光散乱型液晶素子の断面模
式図を図2を示す。ＩＴＯ膜からなる透明電極5ａ、5ｂ
を有する基板4ａ，4ｂの間に、セルギャップが１０ミク
ロン程度になるようにスペーサを散布してセルを作成し
た。基板4ａ，4ｂには平滑なガラス板を用いたが、透明
高分子フイルムを使用してもよい。次に完成したセル
に、ポリマーネットワーク液晶（ＰＮ−ＬＣ）を一定温
度に保ちながら注入し、約５０ｍｗ／ｃｍ2 の紫外線を
１分間照射して散乱型液晶層6を形成した。なお、散乱
型液晶層はポリマーネットワーク液晶以外に、コレステ
リック・ネマティック相転移型液晶モード、高分子分散
液晶モード、動的散乱液晶モード（ＤＳＭ）を使用して
もよい。An embodiment of the present invention will be specifically described below. Example 1 FIG. 2 shows a schematic cross-sectional view of a light scattering type liquid crystal element used in the present invention. Transparent electrodes 5a and 5b made of ITO film
A spacer was dispersed between the substrates 4a and 4b having a thickness of about 10 microns to form cells. Although a smooth glass plate is used for the substrates 4a and 4b, a transparent polymer film may be used. Next, a polymer network liquid crystal (PN-LC) was injected into the completed cell while keeping it at a constant temperature, and irradiated with ultraviolet rays of about 50 mw / cm 2 for 1 minute to form a scattering type liquid crystal layer 6. The scattering type liquid crystal layer may use a cholesteric-nematic phase transition type liquid crystal mode, a polymer dispersed liquid crystal mode, or a dynamic scattering liquid crystal mode (DSM) in addition to the polymer network liquid crystal.
【００１１】次に、本発明の表示素子の断面模式図を図
1に示す。表示素子１とＥＬ光源３の間に光散乱型液晶
素子2を設置し、該液晶素子の透明電極間に電圧を印加
してバックライトの輝度調整を行った。この場合、光散
乱型液晶素子2の印加電圧を低くした時すなわち光散乱
度が強い（透過率が低い）時にバックライトの輝度を低
くでき、印加電圧を高くした時すなわち光散乱度が弱い
（透過率が高い）時にバックライトの輝度を高くするこ
とができた。Next, a schematic sectional view of the display element of the present invention is shown in FIG.
Shown in 1. A light scattering type liquid crystal element 2 was placed between the display element 1 and the EL light source 3, and a voltage was applied between the transparent electrodes of the liquid crystal element to adjust the brightness of the backlight. In this case, the brightness of the backlight can be reduced when the applied voltage of the light scattering type liquid crystal element 2 is reduced, that is, when the light scattering degree is strong (the transmittance is low), and when the applied voltage is increased, that is, the light scattering degree is weak ( When the transmittance was high), the brightness of the backlight could be increased.
【００１２】（実施例2）実施例1で、面光源であるＥＬ
の代わりに点光源であるＬＥＤを用いた。その断面模式
図を図4に示す。散乱型液晶素子は導光板としての効果
も有するため、従来の導光板の代わりに散乱型液晶素子
2を設置し、バックライトを使用しないときのために反
射板１０を最下部に設けて表示素子を構成した。この場
合は、印加電圧を低くした時すなわち光散乱度が強い
（透過率が低い）時にバックライトの輝度を高くでき、
印加電圧を高くした時すなわち光散乱度が弱い（透過率
が高い）時にバックライトの輝度を低減させることがで
きた。(Embodiment 2) In Embodiment 1, an EL which is a surface light source
Instead of using a point light source, an LED was used. FIG. 4 shows a schematic cross-sectional view thereof. Since the scattering type liquid crystal element also has an effect as a light guide plate, the scattering type liquid crystal element is used instead of the conventional light guide plate.
2 and a display element was constructed by providing a reflector 10 at the bottom at the time of not using a backlight. In this case, when the applied voltage is low, that is, when the light scattering degree is strong (the transmittance is low), the brightness of the backlight can be increased,
When the applied voltage was high, that is, when the degree of light scattering was low (the transmittance was high), the brightness of the backlight could be reduced.
【００１３】また、点光源の代わりに線光源を用いて、
散乱型液晶素子２の横方向の一辺から光を入射させて、
散乱型液晶素子で導光し表示素子１を均一に照明するこ
とができる。Further, a line light source is used instead of a point light source,
Light is incident from one side in the lateral direction of the scattering type liquid crystal element 2,
The display device 1 can be uniformly illuminated by the light guided by the scattering type liquid crystal element.
【００１４】[0014]
【発明の効果】本発明は、光源と表示素子の間に光散乱
型の液晶素子を設けるだけの簡単な構造で、バックライ
トからの光量を可変にしたものであり、環境に応じて最
適な表示視認性を得ることができる。また、光散乱型で
あるため、反射板としての代用ができ、従来使われてい
た半透過型の反射板を除くことができる。従って該反射
板でのバックライトの光の損失を除去でき、バックライ
トの利用効率を最大限にすることができる。The present invention has a simple structure in which a light-scattering type liquid crystal element is provided between a light source and a display element, and has a variable amount of light from a backlight. Display visibility can be obtained. Further, since it is a light scattering type, it can be used as a reflection plate, and a conventionally used semi-transmission type reflection plate can be eliminated. Therefore, the loss of light of the backlight at the reflector can be eliminated, and the utilization efficiency of the backlight can be maximized.
【図1】本発明にかかる表示素子の構成の一例を示す断
面模式図である。FIG. 1 is a schematic sectional view illustrating an example of a configuration of a display element according to the present invention.
【図2】本発明に用いる光散乱型液晶表示素子の構成の
一例を示す断面模式図である。FIG. 2 is a schematic cross-sectional view illustrating an example of a configuration of a light-scattering type liquid crystal display element used in the present invention.
【図3】本発明に用いる光散乱型液晶表示素子の一例の
印加電圧と透過率の関係図である。FIG. 3 is a diagram illustrating a relationship between applied voltage and transmittance of an example of a light-scattering type liquid crystal display element used in the present invention.
【図4】本発明に用いる光散乱型液晶表示素子の構成の
他の一例を示す断面模式図である。FIG. 4 is a schematic sectional view showing another example of the configuration of the light-scattering type liquid crystal display element used in the present invention.
【図5】従来の表示素子の構成の一例を示す断面模式図
である。FIG. 5 is a schematic cross-sectional view illustrating an example of a configuration of a conventional display element.
【図6】従来の表示素子の構成の一例を示す断面模式図
である。FIG. 6 is a schematic cross-sectional view illustrating an example of a configuration of a conventional display element.
１ 表示素子 ２ 光散乱型液晶素子 ３ 光源 ４a、b 基板 ５a、b 透明電極 ６ 散乱型液晶層 ７ 半透過反射板 ８ 光源 ９ 導光板 １０ 反射板 DESCRIPTION OF SYMBOLS 1 Display element 2 Light scattering type liquid crystal element 3 Light source 4a, b Substrate 5a, b Transparent electrode 6 Scattering type liquid crystal layer 7 Semi-transmissive reflection plate 8 Light source 9 Light guide plate 10 Reflection plate
Claims (6)
めの光源と、前記表示素子と前記光源の間に設けられた
光散乱型の液晶素子と、を備え、前記液晶素子に印加す
る電界を変化させることにより、表示素子を透過する前
記光源からの光量を調節することを特徴とする表示装
置。1. An electric field, comprising: a display element; a light source for illuminating the display element; and a light-scattering liquid crystal element provided between the display element and the light source. A display device that adjusts the amount of light from the light source that passes through the display element by changing the light intensity.
る請求項１記載の表示装置。2. The display device according to claim 1, wherein the light source is a point light source.
る請求項１記載の表示装置。3. The display device according to claim 1, wherein the light source is a surface light source.
られた光散乱型の液晶素子と、前記液晶素子の横方向か
ら光を入射する光源と、前記液晶素子の背後に設けられ
た反射板と、を備え、前記液晶素子に印加する電界を変
化させることにより、表示素子を透過する前記光源から
の光量を調節することを特徴とする表示装置。4. A display element, a light-scattering type liquid crystal element provided behind the display element, a light source for entering light from a lateral direction of the liquid crystal element, and a reflection element provided behind the liquid crystal element. A display device comprising: a plate; and adjusting an amount of light from the light source transmitting through the display element by changing an electric field applied to the liquid crystal element.
る請求項４記載の表示装置。5. The display device according to claim 4, wherein said light source is a point light source.
る請求項４記載の表示素子。6. The display device according to claim 4, wherein the light source is a linear light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9776798A JPH11295704A (en) | 1998-04-09 | 1998-04-09 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9776798A JPH11295704A (en) | 1998-04-09 | 1998-04-09 | Display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11295704A true JPH11295704A (en) | 1999-10-29 |
Family
ID=14201025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9776798A Pending JPH11295704A (en) | 1998-04-09 | 1998-04-09 | Display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11295704A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004021254A (en) * | 2002-06-13 | 2004-01-22 | Toppoly Optelectronics Corp | Transmission-reflection switching liquid crystal display |
| JP2005534969A (en) * | 2002-07-30 | 2005-11-17 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Transflective liquid crystal display device |
| KR100965581B1 (en) * | 2003-11-27 | 2010-06-23 | 엘지디스플레이 주식회사 | LCD and its response time control method |
| US9891454B2 (en) | 2011-12-29 | 2018-02-13 | Cardinal Ig Company | Multiple glazing with variable diffusion by liquid crystals and method of manufacture thereof |
-
1998
- 1998-04-09 JP JP9776798A patent/JPH11295704A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004021254A (en) * | 2002-06-13 | 2004-01-22 | Toppoly Optelectronics Corp | Transmission-reflection switching liquid crystal display |
| JP2005534969A (en) * | 2002-07-30 | 2005-11-17 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Transflective liquid crystal display device |
| KR100965581B1 (en) * | 2003-11-27 | 2010-06-23 | 엘지디스플레이 주식회사 | LCD and its response time control method |
| US9891454B2 (en) | 2011-12-29 | 2018-02-13 | Cardinal Ig Company | Multiple glazing with variable diffusion by liquid crystals and method of manufacture thereof |
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