JPH06258634A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH06258634A JPH06258634A JP5044124A JP4412493A JPH06258634A JP H06258634 A JPH06258634 A JP H06258634A JP 5044124 A JP5044124 A JP 5044124A JP 4412493 A JP4412493 A JP 4412493A JP H06258634 A JPH06258634 A JP H06258634A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display device
- retardation
- crystal display
- plate
- 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
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- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶表示デバイスに関す
る。さらに詳しくは、偏光めがねをかけてどの方向から
みても、認識できる液晶表示デバイスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device that can be recognized from any direction by wearing polarized glasses.
【０００２】[0002]
【従来の技術】液晶表示デバイスは電気信号により液晶
の状態変化を起させ、光学情報に変換するもので、その
機構の違いにより、ツイストネマティック方式や複屈折
制御方式などの方式が採用されている。2. Description of the Related Art A liquid crystal display device changes the state of liquid crystal by an electric signal and converts it into optical information. Depending on the mechanism, a twisted nematic system or a birefringence control system is adopted. .
【０００３】従来の液晶表示デバイスの一例を図３に示
す。図３は従来のツイストネマティック型液晶表示デバ
イスを偏光めがねをかけて眺めたばあいの偏光めがねの
吸収軸の方向などを示す分解説明図である。図３におい
て、液晶層（図示されず）が２枚の透明基板（図示され
ず）に挾持された液晶セル１の両側にフロント側偏光板
２およびリア側偏光板３が配設され、裏面側には光源５
が配設されている。液晶層としては、たとえばツイスト
ネマティック（以下、ＴＮという）液晶材料が用いられ
ている。An example of a conventional liquid crystal display device is shown in FIG. FIG. 3 is an exploded explanatory view showing the direction of the absorption axis of the polarization glasses when the conventional twisted nematic liquid crystal display device is viewed with the polarization glasses. In FIG. 3, a front side polarizing plate 2 and a rear side polarizing plate 3 are arranged on both sides of a liquid crystal cell 1 in which a liquid crystal layer (not shown) is sandwiched between two transparent substrates (not shown), and a back side Light source 5
Is provided. For the liquid crystal layer, for example, a twisted nematic (hereinafter referred to as TN) liquid crystal material is used.
【０００４】この例では、前述のフロント側偏光板２お
よびリア側偏光板３は、それぞれの吸収軸の方向Ｃ、Ｄ
がほぼ同一方向になるように構成されると共に、液晶層
の表示面（フロント面）側の液晶分子の配列方向である
ラビング方向Ａとフロント側偏光板２の吸収軸方向Ｃと
が同一方向になるように構成されている。さらに、この
ＴＮ型液晶層は、液晶層のフロント側である表面と、液
晶層のリア側である裏面での液晶分子の配列方向Ａ、Ｂ
が90°ねじれているため、フロント側偏光板２の吸収軸
Ｃとリア側偏光板３の吸収軸の方向Ｄとが同一方向であ
るタイプはネガ型液晶表示デバイスとよばれ、両電極間
に電圧が印加されていないとき、背景が暗色にみえる。
この逆に両偏光板の吸収軸方向を垂直方向にすることに
よりポジ型にすることもできる。In this example, the front-side polarizing plate 2 and the rear-side polarizing plate 3 have their absorption axes in the directions C and D, respectively.
Are arranged in substantially the same direction, and the rubbing direction A, which is the alignment direction of the liquid crystal molecules on the display surface (front surface) side of the liquid crystal layer, and the absorption axis direction C of the front side polarizing plate 2 are in the same direction. Is configured to be. Further, the TN type liquid crystal layer has alignment directions A and B of liquid crystal molecules on the front surface of the liquid crystal layer and the rear surface of the liquid crystal layer.
Since 90 ° is twisted by 90 °, a type in which the absorption axis C of the front side polarizing plate 2 and the direction D of the absorption axis of the rear side polarizing plate 3 are in the same direction is called a negative type liquid crystal display device, and between the electrodes. The background appears dark when no voltage is applied.
On the contrary, a positive type can also be obtained by making the absorption axis directions of both polarizing plates vertical.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の液晶表
示デバイスのばあい、フロント側偏光板２から出射する
光が直線偏光になっているため、図３に示すように観測
者７が偏光めがね６をかけているばあい、見る方向によ
っては液晶表示面が見えなくなる。すなわちフロント側
偏光板２の吸収軸の方向Ｃと偏光めがね６の吸収軸の方
向Ｆとのなす角度が90°のばあい、光源５から液晶表示
デバイスに入射し、フロント側偏光板２から出射する光
が、自動車の運転や釣などのときに使用される偏光めが
ね６を透過できなくなるという欠点がある。とくに液晶
表示デバイスが自動車のインジケータなど、表示計器に
使用されたばあい、運転者が偏光板を使用したサングラ
スをかけていることがよくあるため、問題となる。However, in the case of the conventional liquid crystal display device, the light emitted from the front side polarizing plate 2 is linearly polarized, so that the observer 7 can wear polarized glasses as shown in FIG. When 6 is applied, the liquid crystal display surface becomes invisible depending on the viewing direction. That is, when the angle C between the absorption axis direction C of the front side polarizing plate 2 and the absorption axis direction F of the polarizing glasses 6 is 90 °, the light source 5 enters the liquid crystal display device and the front side polarizing plate 2 emits the light. There is a drawback in that the light that is emitted cannot pass through the polarizing glasses 6 used when driving or fishing an automobile. In particular, when the liquid crystal display device is used for a display instrument such as an indicator of a car, it is a problem because the driver often wears sunglasses using a polarizing plate.
【０００６】本発明の目的は、偏光めがねをかけた観測
者がどの方向から眺めても、表示面が偏った着色になら
ないで、確実に視認できる液晶表示デバイスを提供する
ことにある。An object of the present invention is to provide a liquid crystal display device in which an observer wearing polarized glasses can surely see the image even if it is viewed from any direction and the display surface is not colored unevenly.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、偏光めが
ねをかけて液晶表示デバイスをどの方向から見ても見え
るようにするため、鋭意検討を重ねた結果、表示面側で
あるフロント側偏光板の表面に位相差板を配置し、その
光学軸の方向とフロント側偏光板の吸収軸の方向とのな
す角度を一定範囲に設定し、かつ、位相差板のリターデ
イションΔｎ・ｄを一定値以上にすることにより、偏光
めがねをかけてどの方向から見ても可視光の全域に対し
認識できることを見出した。Means for Solving the Problems As a result of intensive investigations, the inventors of the present invention have made extensive studies in order to make the liquid crystal display device visible when viewed from any direction by wearing polarized glasses. The retardation plate is arranged on the surface of the polarizing plate, the angle formed by the optical axis direction and the absorption axis direction of the front side polarizing plate is set within a certain range, and the retardation Δn · d of the retardation plate is set. It has been found that by setting the value above a certain value, it is possible to recognize the entire visible light range from any direction with polarized glasses.
【０００８】本発明の液晶表示デバイスは、２枚の透明
基板で液晶層が挾持され、該２枚の透明基板の外側にそ
れぞれ偏光板が配置され、前記液晶層の一方の面で表示
されてなる液晶表示デバイスであって、前記液晶層の表
示面側に配置されたフロント側偏光板の前面に位相差板
が配置され、該位相差板はその光学軸が前記フロント側
偏光板の吸収軸とほぼ35°〜55°の角度をなすように配
置されると共に、前記位相差板のリターデイションがほ
ぼ4000nm以上の範囲に設定されてなるものである。In the liquid crystal display device of the present invention, a liquid crystal layer is sandwiched between two transparent substrates, and a polarizing plate is arranged outside each of the two transparent substrates so that the liquid crystal layer is displayed on one surface of the liquid crystal layer. In the liquid crystal display device, a retardation plate is disposed on the front surface of the front side polarizing plate disposed on the display surface side of the liquid crystal layer, and the retardation plate has an optical axis of the absorption axis of the front side polarizing plate. And the retardation of the retardation plate is set in the range of approximately 4000 nm or more.
【０００９】[0009]
【作用】本発明によれば、フロント側偏光板の前面に位
相差板を配設し、位相差板の光学軸の方向とフロント側
偏光板の吸収軸の方向とのなす角度をほぼ35°〜55°に
すると共に、そのリターデイションΔｎ・ｄをほぼ4000
nm以上に設定しているため、位相差板の複屈折性により
常光線と異常光線とのあいだの位相のズレが１／４波長
となる波長の光が、可視光の全波長領域（380nm 〜780n
m ）にわたって多数存在する。すなわち青色波長領域
（380 〜500nm ）、緑色波長領域（500nm 〜600nm ）、
赤色波長領域（600nm 〜780nm)のいずれの波長領域にお
いても、透過率のわるい波長もある反面、透過率のよい
波長が存在し、各色領域で、円偏光に近い楕円偏光にな
る。そのため、一定方向の吸収軸を有する偏光めがねを
使用して、液晶表示デバイスをどの方向から見ても表示
される色によって表示面が見づらくなったりすることが
なく良好に認識することができる。According to the present invention, the retardation plate is provided on the front surface of the front polarizing plate, and the angle formed by the optical axis of the retardation plate and the absorption axis of the front polarizing plate is approximately 35 °. The retardation Δn ・ d is set to about 4,000 while setting it to 55 °.
Since it is set to nm or more, the light with a wavelength where the phase shift between the ordinary ray and the extraordinary ray becomes ¼ wavelength due to the birefringence of the retardation plate is the entire visible wavelength region (380 nm ~ 780n
m) exist in large numbers. That is, blue wavelength range (380-500nm), green wavelength range (500-600nm),
In any wavelength range of the red wavelength range (600 nm to 780 nm), there are wavelengths with poor transmittance, but there are wavelengths with good transmittance, and in each color region, elliptically polarized light close to circularly polarized light is obtained. Therefore, it is possible to satisfactorily recognize the liquid crystal display device by using the polarized glasses having the absorption axis in a certain direction without making the display surface difficult to see due to the color displayed.
【００１０】[0010]
【実施例】つぎに、図面を参照しながら本発明を説明す
る。図１は本発明のＴＮ型液晶表示デバイスを偏光めが
ねをかけて眺めたばあいの偏光めがねの吸収軸の方向な
どを示す分解説明図、図２は液晶セルに電界を印加した
ばあいに、位相差板から出た種々の波長の光の偏光めが
ねの透過率を表わすグラフである。The present invention will be described below with reference to the drawings. FIG. 1 is an exploded explanatory view showing the direction of the absorption axis of the polarization glasses when the TN type liquid crystal display device of the present invention is viewed with polarization glasses, and FIG. 2 shows the position when an electric field is applied to the liquid crystal cell. It is a graph showing the transmittance | permeability of the polarization glasses of the light of various wavelengths which came out of the phase difference plate.
【００１１】図１において、液晶層が２枚の透明基板に
挾持された液晶セル１の両側にフロント側偏光板２およ
びリア側偏光板３が配設され、表示面側であるフロント
側偏光板２の表面側にさらに位相差板４が配設されてい
る。また裏面側には光源５が配設されている。液晶材料
としては、たとえばＴＮ液晶が用いられ、両透明基板間
で90°のねじれが生じるため、両側の透明基板に設けら
れるラビング方向は、たとえば図１にＡ、Ｂで示される
ように90°の方向をなしている。また両偏光板２、３の
吸収軸の方向Ｃ、Ｄは図１に示すように、フロント側と
リア側とで同じ方向にして、ネガ型ＴＮ液晶表示デバイ
スを構成している。６は偏光めがねを示し、位相差板４
の光学軸の方向をＥ、偏光めがね６の吸収軸の方向をＦ
で示している。位相差板４は、フロント側偏光板２の前
に一定の間隙をあけて配置してもよいし、フロント側偏
光板２の表面に密着または接着してもよい。また位相差
板４の表面をアングレア処理し、乱反射機能をもたせて
もよい。こうすることにより液晶表示パネル表面におけ
る外光反射による視認性低下を防止する効果がある。位
相差板４はたとえばポリカーボネートなどの異常光線と
常光線とのあいだで位相差を生じるフィルムからなり、
高分子材料が熱延伸され、一軸延伸高分子フィルムに形
成されている。また位相差板４は、雲母、人工雲母、水
晶などの無機物により作製することもできる。位相遅れ
（リターデイション）Ｒと屈折率ｎe 、ｎo とのあいだ
には Ｒ＝｜ｎe −ｎo ｜×ｄ＝Δｎ・ｄ の関係が成り立つ。ここで、ｄは板材の厚さ、ｎe は異
常光線に対する屈折率、ｎo は常光線に対する屈折率で
ある。In FIG. 1, a front side polarizing plate 2 and a rear side polarizing plate 3 are disposed on both sides of a liquid crystal cell 1 in which a liquid crystal layer is sandwiched between two transparent substrates, and a front side polarizing plate which is a display surface side. A retardation plate 4 is further arranged on the front surface side of 2. A light source 5 is arranged on the back side. As the liquid crystal material, for example, TN liquid crystal is used, and a twist of 90 ° occurs between both transparent substrates. Therefore, the rubbing direction provided on the transparent substrates on both sides is 90 ° as shown by A and B in FIG. The direction is. Further, as shown in FIG. 1, the directions C and D of the absorption axes of the two polarizing plates 2 and 3 are the same on the front side and the rear side to form a negative TN liquid crystal display device. 6 indicates polarization glasses, and the phase difference plate 4
The direction of the optical axis of E is E, and the direction of the absorption axis of the polarization glasses 6 is F
It shows with. The retardation plate 4 may be arranged in front of the front side polarizing plate 2 with a certain gap, or may be closely attached or adhered to the surface of the front side polarizing plate 2. Also, the surface of the retardation plate 4 may be subjected to an angler treatment so as to have a diffuse reflection function. By doing so, there is an effect of preventing a decrease in visibility due to reflection of external light on the surface of the liquid crystal display panel. The retardation plate 4 is made of a film such as polycarbonate that causes a phase difference between an extraordinary ray and an ordinary ray,
A polymer material is heat-stretched to form a uniaxially stretched polymer film. The retardation plate 4 can also be made of an inorganic material such as mica, artificial mica, and quartz. The relationship of R = | n e −n o | × d = Δn · d holds between the phase retardation (retardation) R and the refractive indices n e and n o . Here, d is the thickness of the plate, n e is the refractive index for the extraordinary ray, n o is the refractive index for ordinary ray.
【００１２】前述のように表示面側に偏光板が配設され
た液晶表示デバイスでは、フロント側偏光板２から出射
した光は、フロント側偏光板の吸収軸の方向と一致する
直線偏光となっているが、本発明では位相差板４を配設
しているため、位相差板４を透過する際に常光線と異常
光線との間に位相のずれが生じ、楕円偏光に変わる。し
たがって位相差板４を配設することにより、偏光めがね
６をかけて液晶表示デバイスを観賞したばあいでも、一
般的にはどの方向からでも観賞できる筈である。しか
し、光の波長と位相差板の厚さによっては殆ど直線偏光
となったり、短軸が短い楕円偏光となったり、また可視
光の波長領域は広く、波長によっては見づらい部分が生
じ、見る方向によって見づらいばあいが生じる。そこで
本発明者らは位相差板の光学軸の方向や厚さを種々変え
て鋭意検討を重ねた結果、位相差板４をフロント側偏光
板２の表面側に配置すると共に、位相差板４の光学軸方
向Ｅとフロント側偏光板２の吸収軸方向Ｃとのなす角度
（鋭角）αをほぼ35°〜55°にし、同時に位相差板のリ
ターデイションΔｎ・ｄをほぼ4000nm以上にすることに
より、偏光めがねをかけてどの方向から観賞しても良好
に視認できることを見出した。In the liquid crystal display device in which the polarizing plate is arranged on the display surface side as described above, the light emitted from the front polarizing plate 2 becomes linearly polarized light which coincides with the direction of the absorption axis of the front polarizing plate. However, in the present invention, since the retardation plate 4 is provided, a phase shift occurs between the ordinary ray and the extraordinary ray when passing through the retardation plate 4, and the elliptically polarized light is changed. Therefore, by arranging the retardation plate 4, even if the liquid crystal display device is viewed with the polarization glasses 6, it should be possible to generally watch from any direction. However, depending on the wavelength of light and the thickness of the retarder, it becomes almost linearly polarized light, or the short axis becomes elliptically polarized light.The wavelength range of visible light is wide, and some parts are difficult to see depending on the wavelength. It makes it difficult to see. Therefore, the inventors of the present invention have made various studies by changing the direction of the optical axis and the thickness of the retardation plate, and as a result, arranged the retardation plate 4 on the front surface side of the front-side polarizing plate 2 and at the same time. The angle (acute angle) α between the optical axis direction E of the above and the absorption axis direction C of the front side polarizing plate 2 is set to approximately 35 ° to 55 °, and at the same time, the retardation Δn · d of the retardation plate is set to approximately 4000 nm or more. As a result, they have found that they can be viewed well from any direction with polarized glasses.
【００１３】前述の構成の液晶表示デバイスを製造し、
位相差板４をフロント側偏光板２の表面に密着させ、位
相差板４の光学軸の方向Ｅとフロント側偏光板２の吸収
軸の方向Ｃとのなす角度αを、０〜90°のあいだで５°
または10°ずつ変えると共に、それぞれの角度αに対
し、位相差板のリターデイションΔｎ・ｄを500 〜1000
0 nmの範囲で変化させた。それぞれのリターデイション
Δｎ・ｄの値と角度αのときに、偏光めがね６の吸収軸
Ｆを360 °回転させながら、観測者７が目視により液晶
表示面の視認特性を測定した。表１にその結果を示す。A liquid crystal display device having the above-mentioned structure is manufactured,
The phase difference plate 4 is brought into close contact with the surface of the front side polarizing plate 2, and the angle α formed by the direction E of the optical axis of the phase difference plate 4 and the direction C of the absorption axis of the front side polarizing plate 2 is 0 to 90 °. 5 ° between
Alternatively, the retardation Δn · d of the retardation plate is set to 500 to 1000 for each angle α while changing by 10 °.
It was changed in the range of 0 nm. At each retardation Δn · d value and angle α, the observer 7 visually measured the visual characteristics of the liquid crystal display surface while rotating the absorption axis F of the polarization glasses 6 by 360 °. The results are shown in Table 1.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１から明らかなように、リターデイショ
ンΔｎ・ｄがほぼ4000nm以上で、かつ、角度αがほぼ35
°〜55°の範囲では、偏光めがね６の吸収軸方向Ｆを36
0 °どの方向に向けても液晶表示面が認識できた。とく
にリターデイションが5000nm以上で、かつ、角度αが45
°の範囲で認識状態が最も優れており（表１のａ）、ま
たリターデイションが5000nm以上で、かつ、角度αが40
°〜50°の範囲でも良好に認識でき、好ましかった（表
１のｂ）。さらにリターデイションが4000nm以上で、か
つ、角度αが35°〜55°の範囲でもやや視認特性は低下
したが認識はできた（表１のｃ）。また、偏光めがねの
角度によっては認識できないものを−で示した。As is clear from Table 1, the retardation Δn · d is approximately 4000 nm or more, and the angle α is approximately 35.
In the range of ° to 55 °, the absorption axis direction F of the polarizing glasses 6 is 36
The liquid crystal display surface could be recognized in any direction of 0 °. Especially retardation is 5000nm or more and angle α is 45
The recognition state is the best in the range of ° (a in Table 1), the retardation is 5000 nm or more, and the angle α is 40.
Good recognition was also possible in the range of ° to 50 ° (b in Table 1). Further, although the retardation was 4000 nm or more and the angle α was in the range of 35 ° to 55 °, the visual recognition characteristics were slightly degraded, but they were recognizable (c in Table 1). In addition, a symbol that cannot be recognized depending on the angle of the polarized glasses is indicated by-.
【００１６】本発明ではリターデイションが大きな位相
差板を使用しているため、位相差板に入射する直線偏光
の波長の違いがわずかであっても、位相差板による常光
線と異常光線との位相のズレは大きなものとなり、図２
に示すように、位相のズレが１／４波長となる波長の光
が可視光の波長領域に多数存在する。そのため、前述の
角度αがほぼ35°〜55°、位相差板のリターデイション
をほぼ4000nm以上にすることにより、偏光めがねをかけ
てどの方向から見ても、液晶表示デバイスの表示画面を
認識することができる。In the present invention, since the retardation plate having a large retardation is used, even if the wavelength difference of the linearly polarized light incident on the retardation plate is slight, the ordinary ray and the extraordinary ray are generated by the retardation plate. The phase shift of is large, and
As shown in, a large number of lights having wavelengths with a phase shift of ¼ wavelength exist in the visible light wavelength region. Therefore, by setting the angle α to approximately 35 ° to 55 ° and setting the retardation of the retardation plate to approximately 4000 nm or more, the display screen of the liquid crystal display device can be recognized from any direction with polarizing glasses. can do.
【００１７】なお、図２は位相差板の角度αを45°、リ
ターデイションが5000nm、偏光めがねの吸収軸方向Ｆを
フロント側偏光板の吸収軸方向Ｃと直交する方向とした
ときの各波長に対する透過率を示す。ここでフロント側
偏光板２の吸収軸方向Ｃと偏光めがね６の吸収軸方向Ｆ
を同一方向にし、位相差板４がないときの透過率を100
％とした。In FIG. 2, the retardation plate angle α is 45 °, the retardation is 5000 nm, and the absorption axis direction F of the polarizing glasses is orthogonal to the absorption axis direction C of the front side polarizing plate. The transmittance with respect to wavelength is shown. Here, the absorption axis direction C of the front side polarizing plate 2 and the absorption axis direction F of the polarization glasses 6
In the same direction, and the transmittance when there is no retardation plate 4 is 100
%.
【００１８】前記実施例では、液晶セルの背後に光源５
を配置する透過型液晶表示デバイスの例を示したが、光
源５に代えて反射板を配置し、表示面側からの光を反射
させる反射型液晶表示デバイスにしても反射した光が透
過型のばあいと同じ経路をとるため、同様の結果がえら
れた。In the above embodiment, the light source 5 is provided behind the liquid crystal cell.
Although the example of the transmissive liquid crystal display device in which the light source 5 is arranged is shown, a reflective plate is arranged in place of the light source 5 to reflect light from the display surface side. Similar results were obtained because the route was the same as Bai.
【００１９】本発明の効果はネガタイプの液晶表示デバ
イスのみならず、ポジタイプの液晶表示デバイスのばあ
いでも、同様の効果がえられる。さらに本発明は、ＴＮ
液晶を用いた液晶表示デバイスに限定されず、他の液
晶、たとえばスーパーツイストネマティック液晶を用い
た液晶表示デバイスなどでも、フロント側偏光板の吸収
軸と位相差板の光学軸方向の関係を保持することによ
り、同様の効果がえられる。The effects of the present invention can be obtained not only in the negative type liquid crystal display device but also in the case of the positive type liquid crystal display device. Furthermore, the present invention provides a TN
Not limited to the liquid crystal display device using the liquid crystal, other liquid crystals, for example, a liquid crystal display device using the super twist nematic liquid crystal, maintains the relationship between the absorption axis of the front side polarizing plate and the optical axis direction of the retardation plate. As a result, the same effect can be obtained.
【００２０】[0020]
【発明の効果】本発明によれば、液晶表示デバイスのフ
ロント側偏光板の前面に、ほぼ4000nm以上のリターデイ
ションを有し、その光学軸が特定方向を向いた位相差板
を配置しているため、偏光めがねをかけてどの方向から
眺めたばあいでも、可視領域の各色を認識することがで
き、液晶表示面を明確に認識することができる。その結
果、偏光めがねをかけて運転することが多いドライバー
などが、自動車内の計器類を見るばあいでも常に視認す
ることができ、運転に支障をきたすことがない。According to the present invention, a retardation plate having a retardation of about 4000 nm or more and an optical axis of which is oriented in a specific direction is arranged on the front surface of a front side polarizing plate of a liquid crystal display device. Therefore, each color in the visible region can be recognized and the liquid crystal display surface can be clearly recognized when viewed from any direction with the polarized glasses. As a result, a driver or the like who often wears polarized glasses can see the instruments even when looking at the instruments in the vehicle, and the driving is not hindered.
【００２１】さらに本発明の液晶表示デバイスは、従来
の液晶表示デバイスの表面に、ポリカーボネートなどか
らなる厚い位相差板を設けるだけでえられるので、従来
の製造プロセスを殆ど変更する必要がなく、安価にうる
ことができる。Further, since the liquid crystal display device of the present invention can be obtained by simply providing a thick retardation plate made of polycarbonate or the like on the surface of the conventional liquid crystal display device, it is not necessary to change the conventional manufacturing process and it is inexpensive. You can get it.
【図１】本発明のＴＮ型液晶表示デバイスを偏光めがね
をかけて眺めたばあいの偏光めがねの吸収軸の方向など
を示す分解説明図である。FIG. 1 is an exploded explanatory view showing a direction of an absorption axis of polarizing glasses when a TN type liquid crystal display device of the present invention is viewed with polarizing glasses.
【図２】位相差板から出た種々の波長の光の偏光めがね
の透過率を表わすグラフである。FIG. 2 is a graph showing the transmittance of polarization glasses for light of various wavelengths emitted from a retardation plate.
【図３】従来のＴＮ型液晶表示デバイスを偏光めがねを
かけて眺めたばあいの偏光めがねの吸収軸の方向などを
示す分解説明図である。FIG. 3 is an exploded explanatory view showing the direction of the absorption axis of the polarization glasses when the conventional TN type liquid crystal display device is viewed with the polarization glasses.
１ 液晶セル ２ フロント側偏光板 ３ リア側偏光板 ４ 位相差板 Ｃ フロント側偏光板の吸収軸方向 Ｅ 位相差板の光学軸方向 1 liquid crystal cell 2 front side polarizing plate 3 rear side polarizing plate 4 retardation plate C absorption axis direction of front side polarizing plate E optical axis direction of retardation plate
Claims (1)
２枚の透明基板の外側にそれぞれ偏光板が配置され、前
記液晶層の一方の面で表示されてなる液晶表示デバイス
であって、前記液晶層の表示面側に配置されたフロント
側偏光板の前面に位相差板が配置され、該位相差板はそ
の光学軸が前記フロント側偏光板の吸収軸とほぼ35°〜
55°の角度をなすように配置されると共に、前記位相差
板のリターデイションがほぼ4000nm以上の範囲に設定さ
れてなる液晶表示デバイス。1. A liquid crystal display device in which a liquid crystal layer is sandwiched between two transparent substrates, a polarizing plate is arranged outside each of the two transparent substrates, and display is performed on one surface of the liquid crystal layer. A retardation plate is disposed on the front surface of the front side polarizing plate disposed on the display surface side of the liquid crystal layer, and the optical axis of the retardation plate is approximately 35 ° to the absorption axis of the front side polarizing plate.
A liquid crystal display device, wherein the retardation plate is arranged to form an angle of 55 ° and the retardation of the retardation plate is set to a range of approximately 4000 nm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05044124A JP3105374B2 (en) | 1993-03-04 | 1993-03-04 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05044124A JP3105374B2 (en) | 1993-03-04 | 1993-03-04 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06258634A true JPH06258634A (en) | 1994-09-16 |
| JP3105374B2 JP3105374B2 (en) | 2000-10-30 |
Family
ID=12682860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05044124A Expired - Fee Related JP3105374B2 (en) | 1993-03-04 | 1993-03-04 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3105374B2 (en) |
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| JP2019174705A (en) * | 2018-03-29 | 2019-10-10 | パナソニックＩｐマネジメント株式会社 | Display device |
| US11453340B2 (en) | 2018-03-29 | 2022-09-27 | Panasonic Intellectual Property Management Co., Ltd. | Display device |
| JP2018139001A (en) * | 2018-04-09 | 2018-09-06 | 東洋紡株式会社 | Image display device |
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| JP3105374B2 (en) | 2000-10-30 |
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