JP2008083115A - Liquid crystal device and electronic apparatus - Google Patents

Liquid crystal device and electronic apparatus Download PDF

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JP2008083115A
JP2008083115A JP2006260033A JP2006260033A JP2008083115A JP 2008083115 A JP2008083115 A JP 2008083115A JP 2006260033 A JP2006260033 A JP 2006260033A JP 2006260033 A JP2006260033 A JP 2006260033A JP 2008083115 A JP2008083115 A JP 2008083115A
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liquid crystal
polarizing plate
light
transmission axis
display panel
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Kazu Kobayashi
佳津 小林
Tomoaki Sekime
智明 関目
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Epson Imaging Devices Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device with which an observer wearing polarization glasses can view a display image without causing luminance to deteriorate. <P>SOLUTION: The liquid crystal device is equipped with a liquid crystal display panel, a first polarizing plate, a second polarizing plate, and a half-wave plate. The liquid crystal display panel has a liquid crystal interposed between two substrates. The polarizing plate is, for example, an upper polarizing plate and is disposed on the side opposite to the liquid crystal side of the substrate of the liquid crystal display panel, which is one substrate between the two substrates. The half-wave plate is disposed on the polarizing plate, and phase advance axis direction of the half-wave plate is set in a direction to have rotated the polarization direction of light emitted from a transmission axis of the polarizing plate at an angle within a range of 90±15°. In this way, by using the liquid crystal device, the display image can be shown to the observer, wearing polarized glasses with transmission axes in a direction vertical to the transmission axis of the polarizing plate, without causing deterioration in the luminance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、各種情報の表示に用いて好適な液晶装置に関する。   The present invention relates to a liquid crystal device suitable for use in displaying various types of information.

液晶装置は、主に、液晶表示パネルと照明装置とより構成される。照明装置から出射された光は液晶表示パネルを透過し、これにより液晶表示パネルは照明される。液晶表示パネルは、２枚の基板に液晶を挟持してなる構造を有している。液晶表示パネルの照明装置側の外面上には、下偏光板が設置され、液晶表示パネルの観察者側の外面上には、上偏光板が設置される。液晶表示パネルは、液晶分子を反転させて、その配向を制御することで階調を変化させる。   The liquid crystal device mainly includes a liquid crystal display panel and an illumination device. The light emitted from the illumination device is transmitted through the liquid crystal display panel, thereby illuminating the liquid crystal display panel. The liquid crystal display panel has a structure in which liquid crystal is sandwiched between two substrates. A lower polarizing plate is installed on the outer surface of the liquid crystal display panel on the lighting device side, and an upper polarizing plate is installed on the outer surface of the liquid crystal display panel on the viewer side. The liquid crystal display panel changes the gradation by inverting the liquid crystal molecules and controlling the orientation thereof.

一般的な液晶装置では、観察者が偏光サングラスなどの偏光めがねをかけて表示画面を見る場合を想定して、上偏光板は、その透過軸の角度が、表示画面の横方向又は縦方向に対して４５[°]となるように設定されている。しかし、このように、上偏光板の角度が規定されてしまうと、液晶表示パネルの液晶分子の反転方向も、それに合わせる必要があり、製造工程上、困難なことが多い。以下に示す特許文献１に記載された液晶装置では、１／４波長板を上偏光板と観察者の間に設置することで、上偏光板から出射された光を、直線偏光から円偏光に変換している。これにより、上偏光板の透過軸の角度がどのような角度であっても、偏光めがねをかけた観察者は、表示画面上に表示された表示画像を見ることができる。つまり、特許文献１に記載の液晶装置では、上偏光板の透過軸の角度、及び、液晶表示パネルの液晶分子の反転方向を、観察者に合わせて設定する必要がない。   In a general liquid crystal device, assuming that an observer views a display screen with polarized glasses such as polarized sunglasses, the upper polarizing plate has an angle of the transmission axis in the horizontal or vertical direction of the display screen. In contrast, the angle is set to 45 [°]. However, if the angle of the upper polarizing plate is defined in this way, it is necessary to adjust the inversion direction of the liquid crystal molecules of the liquid crystal display panel, which is often difficult in the manufacturing process. In the liquid crystal device described in Patent Document 1 shown below, the light emitted from the upper polarizing plate is changed from linearly polarized light to circularly polarized light by installing a quarter wavelength plate between the upper polarizing plate and the observer. It has been converted. Thereby, whatever the angle of the transmission axis of the upper polarizing plate is, an observer wearing polarized glasses can see the display image displayed on the display screen. That is, in the liquid crystal device described in Patent Document 1, it is not necessary to set the angle of the transmission axis of the upper polarizing plate and the inversion direction of the liquid crystal molecules of the liquid crystal display panel according to the observer.

特開平６−２５８６３３号公報JP-A-6-258633

しかしながら、上記の特許文献１に記載された１／４波長板を用いた液晶装置から出射された光の輝度は、通常の偏光サングラスなどの偏光めがねをかけないで表示画面を見た場合は１／４波長板を用いない一般的な液晶装置から出射された光の輝度と変わらないものの、偏光サングラスなどの偏光めがねをかけて表示画面を見た場合は低下してしまう。   However, the luminance of the light emitted from the liquid crystal device using the quarter-wave plate described in Patent Document 1 is 1 when the display screen is viewed without using polarized glasses such as ordinary polarized sunglasses. Although it does not differ from the luminance of light emitted from a general liquid crystal device that does not use a quarter-wave plate, it decreases when the display screen is viewed with polarized glasses such as polarized sunglasses.

本発明は以上の点に鑑みてなされたものであり、偏光めがねをかけている観察者に対し、輝度を低下させることなく、表示画像を見せることのできる液晶装置を提供することを課題とする。   The present invention has been made in view of the above points, and it is an object of the present invention to provide a liquid crystal device that can display a display image without reducing luminance for an observer wearing polarized glasses. .

本発明の１つの観点では、液晶装置は、２枚の基板の間に液晶を挟持してなる液晶表示パネルと、前記２枚の基板のうち一方の基板上であって、前記液晶側とは反対側に設置されている偏光板と、前記偏光板上に設置されている半波長板と、を備え、前記半波長板の進相軸の方向は、前記偏光板の透過軸より出射された光の偏光方向を９０±１５[°]の範囲内の角度で回転させる方向となっている。
上記の液晶装置は、液晶表示パネルと、偏光板と、半波長板と、を備える。前記液晶表示パネルは、２枚の基板の間に液晶を挟持してなる。前記偏光板は、例えば、上偏光板であり、前記２枚の基板のうち一方の基板上であって、前記液晶表示パネルの前記基板の前記液晶側とは反対側に設置されている。前記半波長板は、前記偏光板上に設置されている。前記半波長板の進相軸の方向は、前記偏光板の透過軸より出射された光の偏光方向を９０±１５[°]の範囲内の角度で回転させる方向となっている。このようにすることで、液晶装置は、前記透過軸の方向と垂直な方向に透過軸を有する偏光めがねをかけた観察者に対し、輝度を低下させることなく、表示画像を見せることができる。 In one aspect of the present invention, a liquid crystal device includes a liquid crystal display panel in which liquid crystal is sandwiched between two substrates, and one of the two substrates on the liquid crystal side. A polarizing plate installed on the opposite side, and a half-wave plate installed on the polarizing plate, and the fast axis direction of the half-wave plate was emitted from the transmission axis of the polarizing plate The light polarization direction is rotated by an angle within the range of 90 ± 15 [°].
The liquid crystal device includes a liquid crystal display panel, a polarizing plate, and a half-wave plate. The liquid crystal display panel has a liquid crystal sandwiched between two substrates. The polarizing plate is, for example, an upper polarizing plate, and is disposed on one of the two substrates, on the side opposite to the liquid crystal side of the substrate of the liquid crystal display panel. The half-wave plate is installed on the polarizing plate. The direction of the fast axis of the half-wave plate is a direction in which the polarization direction of light emitted from the transmission axis of the polarizing plate is rotated by an angle in the range of 90 ± 15 [°]. In this way, the liquid crystal device can display a display image without reducing the luminance for an observer who has applied polarized glasses having a transmission axis in a direction perpendicular to the direction of the transmission axis.

上記の液晶装置の好適な実施例は、前記半波長板の進相軸の方向は、前記偏光板の透過軸に対し４５±１５[°]の範囲内の角度となる方向に合わされている。   In a preferred embodiment of the above-described liquid crystal device, the direction of the fast axis of the half-wave plate is aligned with a direction that makes an angle within a range of 45 ± 15 [°] with respect to the transmission axis of the polarizing plate.

本発明の他の観点では、上記の液晶装置を表示部として備える電子機器を構成することができる。   In another aspect of the present invention, an electronic device including the above-described liquid crystal device as a display portion can be configured.

以下、図面を参照して本発明の好適な実施形態について説明する。尚、以下の実施形態は、本発明の照明装置を液晶装置に適用したものである。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the illumination device of the present invention is applied to a liquid crystal device.

[液晶装置の構成]
図１は、本実施形態に係る液晶装置１００の断面図である。液晶装置１００は、主に、照明装置１０と、液晶表示パネル２０より構成される。照明装置１０は、主に、導光板１１と光源部１５より構成される。液晶表示パネル２０は、導光板１１の上面側に対向して配置される。また、照明装置１０は、導光板１１の下面側に反射シート１４を備える。 [Configuration of liquid crystal device]
FIG. 1 is a cross-sectional view of a liquid crystal device 100 according to the present embodiment. The liquid crystal device 100 mainly includes a lighting device 10 and a liquid crystal display panel 20. The illumination device 10 is mainly composed of a light guide plate 11 and a light source unit 15. The liquid crystal display panel 20 is disposed to face the upper surface side of the light guide plate 11. The lighting device 10 includes a reflection sheet 14 on the lower surface side of the light guide plate 11.

光源部１５は、導光板１１の端面１１ｃに配置され、点光源である複数のＬＥＤ１６を備える。   The light source part 15 is arrange | positioned at the end surface 11c of the light-guide plate 11, and is provided with several LED16 which is a point light source.

各ＬＥＤ１６から出射された光Ｌは、導光板１１の端面１１ｃより導光板１１内へ入る。導光板１１において、上面は、光を出射する出射面１１ａとして機能し、下面は、光を反射する反射面１１ｂとして機能する。光Ｌは、導光板１１の出射面１１ａと反射面１１ｂの間で反射を繰り返すことにより方向を変え、出射面１１ａより外部へ出射する。出射した光Ｌは、液晶表示パネル２０へ向けて進む。   The light L emitted from each LED 16 enters the light guide plate 11 from the end surface 11 c of the light guide plate 11. In the light guide plate 11, the upper surface functions as an emission surface 11 a that emits light, and the lower surface functions as a reflection surface 11 b that reflects light. The light L changes its direction by repeating reflection between the exit surface 11a and the reflection surface 11b of the light guide plate 11, and exits from the exit surface 11a to the outside. The emitted light L travels toward the liquid crystal display panel 20.

液晶表示パネル２０は、導光板１１の発光面積とほぼ同一の表示面積を有する。液晶表示パネル２０は、ガラスなどの基板１及び２を、シール材３を介して貼り合わせてセル構造を形成し、その内部に液晶４を封入して構成される。基板１の内面上には、サブ画素毎に画素電極２１が配置され、基板２の内面上には、全面に共通電極２２、サブ画素毎に着色層６が配置される。なお、本実施形態に係る液晶表示パネル２０は、ＴＮ（Twisted Nematic）方式の液晶表示パネルであり、画素電極２１と共通電極２２との間に電圧を印加することにより、液晶４の液晶分子を反転させ、その配向を変化させる。   The liquid crystal display panel 20 has a display area substantially the same as the light emission area of the light guide plate 11. The liquid crystal display panel 20 is configured by bonding substrates 1 and 2 made of glass or the like through a sealing material 3 to form a cell structure and enclosing a liquid crystal 4 therein. On the inner surface of the substrate 1, a pixel electrode 21 is disposed for each subpixel, and on the inner surface of the substrate 2, the common electrode 22 is disposed on the entire surface, and the colored layer 6 is disposed on each subpixel. The liquid crystal display panel 20 according to the present embodiment is a TN (Twisted Nematic) liquid crystal display panel, and the liquid crystal molecules of the liquid crystal 4 are changed by applying a voltage between the pixel electrode 21 and the common electrode 22. Invert and change its orientation.

基板１の外面上には、下偏光板５ｂが設置され、基板２の外面上には、上偏光板５ａが設置される。偏光板は、光の振動を通過させる透過軸を有すると共に、当該透過軸に垂直な方向には、光の振動を吸収する吸収軸を有する。なお、本実施形態に係る液晶表示パネル２０として、ＴＮ方式の液晶表示パネルが用いられるので、下偏光板５ｂと上偏光板５ａは、下偏光板５ｂの透過軸と上偏光板５ａの透過軸とが互いに直交するように配置される。   A lower polarizing plate 5 b is installed on the outer surface of the substrate 1, and an upper polarizing plate 5 a is installed on the outer surface of the substrate 2. The polarizing plate has a transmission axis that allows the vibration of light to pass therethrough, and an absorption axis that absorbs the vibration of the light in a direction perpendicular to the transmission axis. Since the TN liquid crystal display panel is used as the liquid crystal display panel 20 according to the present embodiment, the lower polarizing plate 5b and the upper polarizing plate 5a have a transmission axis of the lower polarizing plate 5b and a transmission axis of the upper polarizing plate 5a. Are arranged so as to be orthogonal to each other.

照明装置１０と液晶表示パネル２０との間には、光学シートとして、例えば、拡散シート１２、プリズムシート１３が設けられる。拡散シート１２は、導光板１１より出射された光Ｌを全方位に拡散する役割を有する。プリズムシート１３は、その断面が複数の略三角形のプリズム形状を一つの方向に延在させた形状となっており、光Ｌを液晶表示パネル２０に集光する役割を有する。   For example, a diffusion sheet 12 and a prism sheet 13 are provided as optical sheets between the illumination device 10 and the liquid crystal display panel 20. The diffusion sheet 12 has a role of diffusing the light L emitted from the light guide plate 11 in all directions. The prism sheet 13 has a shape in which a cross section of a plurality of substantially triangular prisms extends in one direction, and has a role of condensing the light L on the liquid crystal display panel 20.

照明装置１０から出射した光Ｌは、拡散シート１２及びプリズムシート１３を通過した後、下偏光板５ｂに入射する。光Ｌは、下偏光板５ｂを透過する際に直線偏光される。直線偏光された光Ｌは、液晶表示パネル２０に入射する。   The light L emitted from the illumination device 10 passes through the diffusion sheet 12 and the prism sheet 13 and then enters the lower polarizing plate 5b. The light L is linearly polarized when passing through the lower polarizing plate 5b. The linearly polarized light L enters the liquid crystal display panel 20.

液晶表示パネル２０は、先にも述べたように、ＴＮ方式の液晶表示パネルなので、画素電極２１と共通電極２２との間に電圧が印加されている場合には、液晶４に旋光性が生じる。そのため、この場合、液晶表示パネル２０に入射した光Ｌは、液晶４によって、その偏光方向が回転させられた後、上偏光板５ａに入射する。光Ｌは、液晶４によって、偏光方向が例えば９０[°]回転させられた場合には、上偏光板５ａの透過軸と同じ方向に偏光方向を有することとなるので、輝度を低下させることなく、上偏光板５ａを通過することができる。   Since the liquid crystal display panel 20 is a TN liquid crystal display panel as described above, the optical rotation occurs in the liquid crystal 4 when a voltage is applied between the pixel electrode 21 and the common electrode 22. . Therefore, in this case, the light L incident on the liquid crystal display panel 20 is incident on the upper polarizing plate 5a after the polarization direction is rotated by the liquid crystal 4. The light L has the polarization direction in the same direction as the transmission axis of the upper polarizing plate 5a when the polarization direction is rotated by, for example, 90 [deg.] By the liquid crystal 4, so that the luminance is not lowered. And can pass through the upper polarizing plate 5a.

一方、画素電極２１と共通電極２２との間に電圧が印加されていない場合には、液晶表示パネル２０に入射した光Ｌは、偏光方向が変えられることなく進み、上偏光板５ａに入射する。このとき、光Ｌは、上偏光板５ａの透過軸と垂直な方向、即ち、上偏光板５ａの吸収軸の方向に偏光方向を有しているので、上偏光板５ａを透過することはできない。   On the other hand, when no voltage is applied between the pixel electrode 21 and the common electrode 22, the light L incident on the liquid crystal display panel 20 proceeds without changing the polarization direction and enters the upper polarizing plate 5a. . At this time, since the light L has a polarization direction in a direction perpendicular to the transmission axis of the upper polarizing plate 5a, that is, in the direction of the absorption axis of the upper polarizing plate 5a, the light L cannot be transmitted through the upper polarizing plate 5a. .

本実施形態では、観察者３０は、偏光サングラスなどの偏光めがね７をかけている。即ち、偏光めがね７は偏光板である。従って、液晶装置１００は、上偏光板５ａの光Ｌが出射する側に、言い換えると、観察者３側に、更にもう一つ、偏光板を有することとなる。そこで、本実施形態に係る液晶装置１００では、位相差板の一種たる半波長板６が上偏光板５ａの外面上に設置されている。後に詳しく述べるが、半波長板６は、光Ｌの偏光方向を偏光めがね７の透過軸に一致させる役割を有する。   In this embodiment, the observer 30 is wearing polarized glasses 7 such as polarized sunglasses. That is, the polarizing glasses 7 are polarizing plates. Therefore, the liquid crystal device 100 has another polarizing plate on the side from which the light L of the upper polarizing plate 5a is emitted, in other words, on the viewer 3 side. Therefore, in the liquid crystal device 100 according to the present embodiment, the half-wave plate 6 which is a kind of retardation plate is installed on the outer surface of the upper polarizing plate 5a. As will be described in detail later, the half-wave plate 6 has a role of making the polarization direction of the light L coincide with the transmission axis of the polarizing glasses 7.

（光の偏光方向）
次に、光Ｌの偏光方向について述べる。図２は、液晶装置１００における光Ｌの偏光方向を示す模式図である。図２において、各偏光板及び偏光めがねにおける透過軸、及び、半波長板における進相軸を、両端矢印の実線で示すこととし、光Ｌの偏光方向を両端矢印の破線で示すこととする。 (Light polarization direction)
Next, the polarization direction of the light L will be described. FIG. 2 is a schematic diagram illustrating the polarization direction of the light L in the liquid crystal device 100. In FIG. 2, the transmission axis in each polarizing plate and polarizing glasses and the fast axis in the half-wave plate are indicated by solid lines with double-ended arrows, and the polarization direction of the light L is indicated by broken lines with double-ended arrows.

図２において、紙面横方向Ｐｏｌに対し、下偏光板５ｂの透過軸５ｂｘの角度は９０[°]、上偏光板５ａの透過軸５ａｘの角度は０[°]、偏光めがね７の透過軸７ｘの角度は９０[°]であるとする。この偏光めがね７の透過軸７ｘの角度は、一般的な偏光サングラスの透過軸の角度を想定している。即ち、偏光めがね７が一般的な偏光サングラスである場合、その透過軸は、観察者３０の左右の目を結んだ直線に対し垂直方向に設けられ、吸収軸は、透過軸と垂直な方向、即ち、左右の目を結んだ直線の方向に設けられる。なぜなら、一般的な偏光サングラスでは、海や川などの水面で反射された太陽の光の反射光によるぎらつきを抑えるために、水面に平行な方向に偏光方向を有する当該反射光を遮断する必要があるためである。   In FIG. 2, the angle of the transmission axis 5bx of the lower polarizing plate 5b is 90 [°], the angle of the transmission axis 5ax of the upper polarizing plate 5a is 0 [°], and the transmission axis 7x of the polarizing glasses 7 with respect to the horizontal direction Pol. The angle is assumed to be 90 [°]. The angle of the transmission axis 7x of the polarized glasses 7 is assumed to be the angle of the transmission axis of general polarized sunglasses. That is, when the polarized glasses 7 are general polarized sunglasses, the transmission axis thereof is provided in a direction perpendicular to the straight line connecting the left and right eyes of the observer 30, and the absorption axis is a direction perpendicular to the transmission axis. That is, it is provided in the direction of a straight line connecting the left and right eyes. This is because in general polarized sunglasses, it is necessary to block the reflected light having a polarization direction parallel to the water surface in order to suppress the glare caused by the reflected light of the sun reflected from the water surface such as the sea or river. Because there is.

また、液晶表示パネル２０では、画素電極２１と共通電極２２との間に電圧が印加されており、液晶４によって光Ｌの偏光方向が９０[°]回転されるとする。   In the liquid crystal display panel 20, it is assumed that a voltage is applied between the pixel electrode 21 and the common electrode 22, and the polarization direction of the light L is rotated by 90 ° by the liquid crystal 4.

照明装置１０より出射された光Ｌは、下偏光板５ｂを透過する際、直線偏光される。透過軸５ｂｘの角度は、紙面横方向Ｐｏｌに対し９０[°]となっているので、下偏光板５ｂを透過する際に直線偏光された光Ｌの偏光方向は、紙面横方向Ｐｏｌに対し９０[°]の方向となる。   The light L emitted from the illumination device 10 is linearly polarized when passing through the lower polarizing plate 5b. Since the angle of the transmission axis 5bx is 90 [°] with respect to the paper surface horizontal direction Pol, the polarization direction of the linearly polarized light L when transmitted through the lower polarizing plate 5b is 90 ° with respect to the paper surface horizontal direction Pol. The direction is [°].

下偏光板５ｂで偏光された光Ｌは、液晶表示パネル２０に入射する。このとき、光Ｌは、波線矢印２０Ｌｉｎで示す方向、即ち、紙面横方向Ｐｏｌに対し９０[°]の方向に偏光方向を有している。液晶表示パネル２０では、液晶４によって、光Ｌの偏光方向が９０[°]回転されるので、液晶表示パネル２０を出射するときの光Ｌの偏光方向は、波線矢印２０Ｌｏｕｔで示す方向、即ち、紙面横方向Ｐｏｌに対し０[°]の方向となる。   The light L polarized by the lower polarizing plate 5 b enters the liquid crystal display panel 20. At this time, the light L has a polarization direction in a direction indicated by a wavy arrow 20 Lin, that is, a direction of 90 ° with respect to the horizontal direction Pol on the paper surface. In the liquid crystal display panel 20, since the polarization direction of the light L is rotated by 90 [°] by the liquid crystal 4, the polarization direction of the light L when exiting the liquid crystal display panel 20 is the direction indicated by the wavy arrow 20Lout, that is, The direction is 0 [°] with respect to the horizontal direction Pol in the drawing.

上偏光板５ａの透過軸５ａｘの方向と液晶表示パネル２０を出射した光Ｌの偏光方向は、どちらも紙面横方向Ｐｏｌに対し０[°]の方向となっている。従って、光Ｌは、上偏光板５ａを透過することができる。   The direction of the transmission axis 5ax of the upper polarizing plate 5a and the polarization direction of the light L emitted from the liquid crystal display panel 20 are both 0 [°] with respect to the horizontal direction Pol on the paper surface. Therefore, the light L can be transmitted through the upper polarizing plate 5a.

上偏光板５ａを透過した光Ｌは、半波長板６に入射する。このとき、光Ｌは、波線矢印６Ｌｉｎの方向、即ち、紙面横方向Ｐｏｌに対し０[°]の方向に偏光方向を有している。半波長板は、位相差板の一種であり、光の進む速度が速い進相軸を有すると共に、当該進相軸に垂直な方向には、光の進む速度が遅い遅相軸を有する。半波長板は、入射光にπの位相差を与え、入射光の偏光方向が波長板の進相軸に対しφ[°]の角度で入射した時に、その偏光方向を２φ[°]回転させる光学素子である。例えば、図２に示す半波長板６では、その進相軸６ｘの方向は、上偏光板５ａの透過軸５ａｘに対し４５[°]の角度となる方向に合わされているため、半波長板６に入射した光Ｌの偏光方向（波線矢印６Ｌｉｎの方向）に対し４５[°]の角度をなしている。従って、半波長板６より出射された光Ｌの偏光方向は、半波長板６によって９０[°]回転された波線矢印６Ｌｏｕｔの方向、即ち、紙面横方向Ｐｏｌに対し９０[°]の方向となる。   The light L that has passed through the upper polarizing plate 5 a is incident on the half-wave plate 6. At this time, the light L has a polarization direction in the direction of the wavy arrow 6Lin, that is, in the direction of 0 [°] with respect to the horizontal direction Pol on the paper surface. The half-wave plate is a kind of retardation plate, and has a fast axis in which the speed of light travels is fast and has a slow axis in which the speed of light travels is slow in a direction perpendicular to the fast axis. The half-wave plate gives a phase difference of π to incident light, and when the polarization direction of the incident light is incident at an angle of φ [°] with respect to the fast axis of the wave plate, the polarization direction is rotated by 2φ [°]. It is an optical element. For example, in the half-wave plate 6 shown in FIG. 2, the direction of the fast axis 6x is aligned with a direction that forms an angle of 45 [°] with respect to the transmission axis 5ax of the upper polarizing plate 5a. An angle of 45 [°] is formed with respect to the polarization direction of the light L incident thereon (the direction of the wavy arrow 6Lin). Accordingly, the polarization direction of the light L emitted from the half-wave plate 6 is the direction of the wavy arrow 6Lout rotated by 90 [°] by the half-wave plate 6, that is, the direction of 90 [°] with respect to the horizontal direction Pol on the paper surface. Become.

半波長板６より出射した光Ｌは、偏光めがね７に入射する。半波長板６より出射した光Ｌの偏光方向と偏光めがね７の透過軸７ｘは、どちらも紙面横方向Ｐｏｌに対し９０[°]の方向となっているので、光Ｌは、輝度を低下させることなく、偏光めがね７を透過することができ、観察者３０の目に入射することができる。   The light L emitted from the half-wave plate 6 enters the polarizing glasses 7. Since the polarization direction of the light L emitted from the half-wave plate 6 and the transmission axis 7x of the polarized glasses 7 are both 90 [°] with respect to the horizontal direction Pol on the paper surface, the light L decreases the luminance. Without passing through, the polarized glasses 7 can pass through and enter the eyes of the observer 30.

なお、上述の例では、半波長板６の進相軸６ｘの方向は、上偏光板５ａの透過軸５ａｘに対し４５[°]の角度となる方向に合わされているとしているが、これに限られるものではなく、実質的に同等の作用効果が得られる範囲、即ち、上偏光板５ａの透過軸５ａｘに対し４５±１５[°]の範囲内の角度となる方向に合わせる場合をも含む。   In the above-described example, the direction of the fast axis 6x of the half-wave plate 6 is set to a direction that forms an angle of 45 [°] with respect to the transmission axis 5ax of the upper polarizing plate 5a. This includes a range in which substantially the same function and effect can be obtained, that is, a case where the angle is set to an angle within a range of 45 ± 15 [°] with respect to the transmission axis 5ax of the upper polarizing plate 5a.

従って、半波長板６より出射した光Ｌの偏光方向（波線矢印６Ｌｏｕｔの方向）は、半波長板６によって９０[°]回転された方向としているが、これに限られるものではなく、代わりに、実質的に同等の作用効果が得られる範囲、即ち、９０±１５[°]の範囲内の角度で回転された方向とすることも含む。   Therefore, the polarization direction of the light L emitted from the half-wave plate 6 (the direction of the wavy arrow 6Lout) is a direction rotated by 90 [°] by the half-wave plate 6, but is not limited to this. In addition, a range in which substantially the same effect is obtained, that is, a direction rotated by an angle within a range of 90 ± 15 [°] is included.

言い換えると、半波長板６の進相軸６ｘの方向は、上偏光板５ａの透過軸より出射された光Ｌの偏光方向を９０±１５[°]の範囲内の角度で回転させる方向となっている。このようにすることで、液晶装置１００では、上偏光板５ａの透過軸５ａｘの方向と垂直な方向に透過軸を有する偏光めがね７をかけた観察者に対し、輝度を低下させることなく、表示画像を見せることができる。   In other words, the direction of the fast axis 6x of the half-wave plate 6 is a direction in which the polarization direction of the light L emitted from the transmission axis of the upper polarizing plate 5a is rotated by an angle within a range of 90 ± 15 [°]. ing. In this manner, the liquid crystal device 100 can display an image on a viewer wearing polarized glasses 7 having a transmission axis in a direction perpendicular to the direction of the transmission axis 5ax of the upper polarizing plate 5a without reducing luminance. You can show an image.

また、上述の例では、上偏光板５ａの透過軸５ａｘの方向は、紙面横方向Ｐｏｌに対し０[°]の方向となっており、偏光めがね７の透過軸７ｘは紙面横方向Ｐｏｌに対し９０[°]の方向となっているとしているが、これに限られず、代わりに、上偏光板５ａの透過軸５ａｘの方向は、紙面横方向Ｐｏｌに対し９０[°]の方向とし、偏光めがね７の透過軸７ｘは紙面横方向Ｐｏｌに対し０[°]の方向とした場合であっても、半波長板６の進相軸６ｘの方向を上偏光板５ａの透過軸５ａｘに対し４５±１５[°]の範囲内に合わせることにより、上述したのと同等の効果を得ることができる。   In the above example, the direction of the transmission axis 5ax of the upper polarizing plate 5a is 0 [°] with respect to the horizontal direction Pol on the paper surface, and the transmission axis 7x of the polarizing glasses 7 is relative to the horizontal direction Pol on the paper surface. Although the direction is 90 [°], it is not limited to this. Instead, the direction of the transmission axis 5ax of the upper polarizing plate 5a is 90 [°] with respect to the horizontal direction Pol on the paper surface, and polarized glasses. 7 is the direction of 0 [°] with respect to the horizontal direction Pol on the paper surface, the direction of the fast axis 6x of the half-wave plate 6 is 45 ± with respect to the transmission axis 5ax of the upper polarizing plate 5a. By adjusting within the range of 15 [°], the same effect as described above can be obtained.

なお、上述の例では、上偏光板５ａの透過軸５ａｘの方向を、紙面横方向Ｐｏｌに対し０[°]の方向とし、偏光めがね７の透過軸７ｘの方向を、紙面横方向Ｐｏｌに対し９０[°]の方向としている。しかし、これに限られるものではなく、代わりに、以下に述べるように、上偏光板５ａの透過軸５ａｘの方向、偏光めがね７の透過軸７ｘの方向を夫々、任意の方向としても本発明を適用することができる。   In the above example, the direction of the transmission axis 5ax of the upper polarizing plate 5a is set to 0 [°] with respect to the horizontal direction Pol on the paper surface, and the direction of the transmission axis 7x of the polarizing glasses 7 is set to the horizontal direction Pol with respect to the paper surface horizontal direction Pol. The direction is 90 [°]. However, the present invention is not limited to this. Instead, as described below, the present invention can be applied even when the direction of the transmission axis 5ax of the upper polarizing plate 5a and the direction of the transmission axis 7x of the polarizing glasses 7 are set to arbitrary directions, respectively. Can be applied.

図３に、上偏光板５ａの透過軸５ａｘの方向を、紙面横方向Ｐｏｌに対し角度θの方向とし、偏光めがね７の透過軸７ｘの方向を、紙面横方向Ｐｏｌに対し角度αの方向とした場合における、光Ｌの偏光方向を示す。   In FIG. 3, the direction of the transmission axis 5ax of the upper polarizing plate 5a is the direction of the angle θ with respect to the paper surface lateral direction Pol, and the direction of the transmission axis 7x of the polarizing glasses 7 is the direction of the angle α with respect to the paper surface horizontal direction Pol. In this case, the polarization direction of the light L is shown.

図３において、半波長板６の進相軸６ｘの方向は、上偏光板５ａの透過軸５ａｘと偏光めがねの透過軸７ｘとのなす角を２等分する直線Ｑの方向と同じ方向となっている。即ち、半波長板６の進相軸６ｘの方向と上偏光板５ａの透過軸５ａｘの方向とのなす角、半波長板６の進相軸６ｘの方向と偏光めがねの透過軸７ｘとのなす角は、どちらも同じ角β（＝（α−θ）／２）となっている。   In FIG. 3, the direction of the fast axis 6x of the half-wave plate 6 is the same as the direction of the straight line Q that bisects the angle formed by the transmission axis 5ax of the upper polarizing plate 5a and the transmission axis 7x of the polarizing glasses. ing. That is, the angle formed by the direction of the fast axis 6x of the half-wave plate 6 and the direction of the transmission axis 5ax of the upper polarizing plate 5a, and the direction of the fast axis 6x of the half-wave plate 6 and the transmission axis 7x of the polarizing glasses. The angles are the same angle β (= (α−θ) / 2).

この場合であっても、上偏光板５ａより出射された透過軸５ａｘの方向に偏光方向を有する光Ｌ（偏光方向６Ｌｉｎ）は、半波長板６により、その偏光方向が２β回転される。従って、このとき、光Ｌの偏光方向は、紙面横方向Ｐｏｌに対し角度θの方向（偏光方向６Ｌｉｎ）から、紙面横方向Ｐｏｌに対し角度αの方向（偏光方向６Ｌｏｕｔ）へ変えられ、偏光めがね７の透過軸７ｘの方向と同じ方向となる。このようにすることで、光Ｌは、輝度を低下することなく偏光めがね７を透過することができる。つまり、上偏光板５ａの透過軸５ａｘの方向、偏光めがね７の透過軸７ｘの方向が夫々どの方向であっても、半波長板６を設置する際に、その進相軸６ｘの方向を、上偏光板５ａの透過軸５ａｘと偏光めがね７の透過軸７ｘとのなす角を２等分する直線Ｑの方向に合わせさえすれば、光Ｌを、その輝度を低下させることなく偏光めがね７に透過させることができる。   Even in this case, the polarization direction of the light L (polarization direction 6 Lin) having the polarization direction in the direction of the transmission axis 5ax emitted from the upper polarizing plate 5a is rotated by 2β by the half-wave plate 6. Therefore, at this time, the polarization direction of the light L is changed from the direction of the angle θ (polarization direction 6Lin) to the horizontal direction Pol on the paper surface to the direction of the angle α (polarization direction 6Lout) with respect to the horizontal direction Pol on the paper surface. 7 in the same direction as the transmission axis 7x. By doing in this way, the light L can permeate | transmit the polarized glasses 7 without reducing a brightness | luminance. That is, regardless of the direction of the transmission axis 5ax of the upper polarizing plate 5a and the direction of the transmission axis 7x of the polarizing glasses 7, when the half-wave plate 6 is installed, the direction of the fast axis 6x is If the angle between the transmission axis 5ax of the upper polarizing plate 5a and the transmission axis 7x of the polarizing glasses 7 is adjusted to the direction of the straight line Q that bisects the light L, the light L is turned into the polarizing glasses 7 without reducing its luminance. Can be transmitted.

なお、上述の例では、半波長板６を設置する際に、その進相軸６ｘの方向を、上偏光板５ａの透過軸５ａｘと偏光めがね７の透過軸７ｘとのなす角を２等分する直線Ｑの方向に合わせるとしているが、これは、進相軸６ｘの方向を直線Ｑに完全に一致させる場合のみを指すのではなく、実質的に同等の作用効果が得られる範囲、即ち、進相軸６ｘの方向を直線Ｑの方向から±１５[°]の範囲内に合わせる場合をも含む。   In the above-described example, when the half-wave plate 6 is installed, the direction of the fast axis 6x is set to bisect the angle formed by the transmission axis 5ax of the upper polarizing plate 5a and the transmission axis 7x of the polarizing glasses 7. However, this does not only refer to the case where the direction of the fast axis 6x is completely coincident with the straight line Q, but a range in which substantially the same effect can be obtained, that is, This includes the case where the direction of the fast axis 6x is adjusted within the range of ± 15 [°] from the direction of the straight line Q.

半波長板６の遅相軸を用いた言い方をすれば、半波長板６を設置する際に、その遅相軸の方向を、上偏光板５ａの吸収軸と偏光めがね７の吸収軸とのなす角を２等分する直線の方向に合わせさえすれば、光Ｌを、その輝度を低下させることなく偏光めがね７に透過させることができる。これも、遅相軸の方向を、上偏光板５ａの吸収軸と偏光めがね７の吸収軸とのなす角を２等分する直線の方向に完全に一致させる場合のみを指すのではなく、実質的に同等の作用効果が得られる範囲、即ち、遅相軸の方向を、上偏光板５ａの吸収軸と偏光めがね７の吸収軸とのなす角を２等分する直線の方向から±１５[°]の範囲内に合わせる場合をも含む。   In other words, using the slow axis of the half-wave plate 6, when installing the half-wave plate 6, the direction of the slow axis is defined by the absorption axis of the upper polarizing plate 5 a and the absorption axis of the polarizing glasses 7. The light L can be transmitted to the polarizing glasses 7 without lowering the luminance as long as the angle formed is aligned with the direction of a straight line that bisects the angle. This is not only the case where the direction of the slow axis completely coincides with the direction of the straight line that bisects the angle formed by the absorption axis of the upper polarizing plate 5a and the absorption axis of the polarizing glasses 7, but substantially In other words, the range in which the same effect can be obtained, that is, the direction of the slow axis is ± 15 [from the direction of a straight line that bisects the angle formed by the absorption axis of the upper polarizing plate 5a and the absorption axis of the polarizing glasses 7. Including the case of fitting within the range of °].

このようにすることで、液晶装置１００は、上偏光板５ａの透過軸の方向、及び、偏光めがね７の透過軸の方向に関係なく、観察者３０に対し、輝度を低下させることなく、表示画像を見せることができる。   By doing in this way, the liquid crystal device 100 can display the observer 30 without lowering the luminance regardless of the direction of the transmission axis of the upper polarizing plate 5a and the direction of the transmission axis of the polarizing glasses 7. You can show an image.

従って、例えば、偏光めがね７が先に述べた一般的な偏光サングラスである場合には、半波長板６の進相軸６ｘの方向を、上偏光板５ａの透過軸５ａｘと、観察者３０の左右の目を結ぶ直線に対し垂直な直線と、のなす角を２等分する直線の方向に合わせさえすれば、別の言い方で言うと、半波長板６の遅相軸の方向を、上偏光板５ａの吸収軸と観察者３０の左右の目を結ぶ直線とのなす角を２等分する直線の方向に合わせさえすれば、液晶装置１００は、一般的な偏光サングラスをかけた観察者３０に対し、輝度を低下させることなく、表示画像を見せることができる。   Therefore, for example, when the polarizing glasses 7 are the general polarized sunglasses described above, the direction of the fast axis 6x of the half-wave plate 6 is set to the transmission axis 5ax of the upper polarizing plate 5a and the observer 30. In other words, the direction of the slow axis of the half-wave plate 6 is the upper direction as long as it matches the direction of the straight line that divides the angle formed by the straight line connecting the right and left eyes with the straight line. As long as the angle formed by the absorption axis of the polarizing plate 5a and the straight line connecting the left and right eyes of the observer 30 is matched to the direction of a straight line that bisects, the liquid crystal device 100 can be viewed by an observer wearing general polarized sunglasses. The display image can be displayed with respect to 30 without reducing the luminance.

[変形例]
上述の実施形態では、液晶表示パネル２０は、ＴＮ方式の液晶表示パネルであるとしているが、これに限られるものではなく、代わりに、ＶＡ（Vertical Aligned）方式の液晶表示パネルや、横電界方式の液晶表示パネルなどの他の液晶表示パネルを用いても良いのは言うまでもない。これらの液晶表示パネルであっても、上偏光板５ａと偏光めがね７の間に半波長板６を設置し、その進相軸の方向を、上偏光板５ａの透過軸と偏光めがね７の透過軸とのなす角を２等分する直線の方向に合わせさえすれば、液晶表示パネル２０から出射された光を、その輝度を低下させることなく、偏光めがね７に透過させることができる。これによっても、液晶装置１００は、上偏光板５ａの透過軸の方向、及び、偏光めがね７の透過軸の方向に関係なく、観察者３０に対し、輝度を低下させることなく、表示画像を見せることができる。 [Modification]
In the above-described embodiment, the liquid crystal display panel 20 is a TN liquid crystal display panel. However, the liquid crystal display panel 20 is not limited to this, and instead, a VA (Vertical Aligned) liquid crystal display panel or a horizontal electric field method is used. It goes without saying that other liquid crystal display panels such as the above liquid crystal display panel may be used. Even in these liquid crystal display panels, a half-wave plate 6 is installed between the upper polarizing plate 5 a and the polarizing glasses 7, and the direction of the fast axis is determined by the transmission axis of the upper polarizing plate 5 a and the transmission of the polarizing glasses 7. The light emitted from the liquid crystal display panel 20 can be transmitted through the polarizing glasses 7 without lowering the brightness as long as the angle formed with the axis is matched to the direction of a straight line that bisects the angle. Also by this, the liquid crystal device 100 displays the display image without reducing the luminance, regardless of the direction of the transmission axis of the upper polarizing plate 5a and the direction of the transmission axis of the polarizing glasses 7. be able to.

また、上述の実施形態では、偏光めがね７を用いるとしているが、これに限られるものではなく、代わりに、偏光板の機能を有する他の部材を用いるとしてもよいのは言うまでもない。   In the above-described embodiment, the polarizing glasses 7 are used. However, the present invention is not limited to this, and it is needless to say that other members having a polarizing plate function may be used instead.

[電子機器]
次に、本発明に係る液晶装置１００を適用可能な電子機器の具体例について図４を参照して説明する。 [Electronics]
Next, specific examples of electronic devices to which the liquid crystal device 100 according to the present invention can be applied will be described with reference to FIG.

まず、本発明に係る液晶装置１００を、可搬型のパーソナルコンピュータ（いわゆるノート型パソコン）の表示部に適用した例について説明する。図４（ａ）は、このパーソナルコンピュータの構成を示す斜視図である。同図に示すように、パーソナルコンピュータ７１０は、キーボード７１１を備えた本体部７１２と、本発明に係る液晶装置１００を適用した表示部７１３とを備えている。   First, an example in which the liquid crystal device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 4A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal device 100 according to the present invention is applied.

続いて、本発明に係る液晶装置１００を、携帯電話機の表示部に適用した例について説明する。図４（ｂ）は、この携帯電話機の構成を示す斜視図である。同図に示すように、携帯電話機７２０は、複数の操作ボタン７２１のほか、受話口７２２、送話口７２３とともに、本発明に係る液晶装置１００を適用した表示部７２４を備える。   Next, an example in which the liquid crystal device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 4B is a perspective view showing the configuration of this mobile phone. As shown in the figure, a cellular phone 720 includes a plurality of operation buttons 721, a receiving port 722, a transmitting port 723, and a display unit 724 to which the liquid crystal device 100 according to the present invention is applied.

なお、本発明に係る液晶装置１００を適用可能な電子機器としては、図４（ａ）に示したパーソナルコンピュータや図４（ｂ）に示した携帯電話機の他にも、液晶テレビ、ビューファインダ型・モニタ直視型のビデオテープレコーダ、カーナビゲーション装置、ページャ、電子手帳、電卓、ワードプロセッサ、ワークステーション、テレビ電話、ＰＯＳ端末、ディジタルスチルカメラなどが挙げられる。   Note that examples of the electronic apparatus to which the liquid crystal device 100 according to the present invention can be applied include a liquid crystal television and a viewfinder type in addition to the personal computer shown in FIG. 4A and the mobile phone shown in FIG. Monitor direct-view video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, digital still cameras, etc.

本実施形態に係る液晶装置の概略構成を示す断面図である。It is sectional drawing which shows schematic structure of the liquid crystal device which concerns on this embodiment. 光Ｌの偏光方向を示す模式図である。3 is a schematic diagram showing a polarization direction of light L. FIG. 光Ｌの偏光方向を示す模式図である。3 is a schematic diagram showing a polarization direction of light L. FIG. 本発明の照明装置を適用した電子機器を示す概略図である。It is the schematic which shows the electronic device to which the illuminating device of this invention is applied.

符号の説明Explanation of symbols

５ａ 上偏光板、 ５ｂ 下偏光板、 ６ 半波長板、 ７ 偏光めがね、 １０ 照明装置、 １１ 導光板、 １５ 光源部、 １６ ＬＥＤ、 ２０ 液晶表示パネル、 １００ 液晶装置   5a Upper polarizing plate, 5b Lower polarizing plate, 6 Half-wave plate, 7 Polarized glasses, 10 Illumination device, 11 Light guide plate, 15 Light source unit, 16 LED, 20 Liquid crystal display panel, 100 Liquid crystal device

Claims (3)

２枚の基板の間に液晶を挟持してなる液晶表示パネルと、
前記２枚の基板のうち一方の基板上であって、前記液晶側とは反対側に設置されている偏光板と、
前記偏光板上に設置されている半波長板と、を備え、
前記半波長板の進相軸の方向は、前記偏光板の透過軸より出射された光の偏光方向を９０±１５[°]の範囲内の角度で回転させる方向となっていることを特徴とする液晶装置。 A liquid crystal display panel having a liquid crystal sandwiched between two substrates;
A polarizing plate disposed on one side of the two substrates and opposite to the liquid crystal side;
A half-wave plate installed on the polarizing plate,
The direction of the fast axis of the half-wave plate is a direction in which the polarization direction of light emitted from the transmission axis of the polarizing plate is rotated by an angle within a range of 90 ± 15 [°]. Liquid crystal device. 前記半波長板の進相軸の方向は、前記偏光板の透過軸に対し４５±１５[°]の範囲内の角度となる方向に合わされていることを特徴とする請求項１に記載の液晶装置。   2. The liquid crystal according to claim 1, wherein the direction of the fast axis of the half-wave plate is aligned with a direction that forms an angle within a range of 45 ± 15 [°] with respect to the transmission axis of the polarizing plate. apparatus. 請求項１又は２に記載の液晶装置を表示部に備えることを特徴とする電子機器。   An electronic apparatus comprising the liquid crystal device according to claim 1 in a display unit.
JP2006260033A 2006-09-26 2006-09-26 Liquid crystal device and electronic apparatus Pending JP2008083115A (en)

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US8964136B2 (en) 2010-04-09 2015-02-24 Sharp Kabushiki Kaisha Active shutter glasses comprising a half-wave plate disposed at an outer side of a linear polarizing element and a stereoscopic image projection system
US9210412B2 (en) 2010-04-09 2015-12-08 Sharp Kabushiki Kaisha Active shutter glasses and a stereoscopic image projection system wherein viewing angles of a shutter section for the left and right eyes are wider on right and left sides than on upper and lower sides
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US10054816B2 (en) 2009-11-12 2018-08-21 Toyo Boseki Kabushiki Kaisha Method for improving visibility of liquid crystal display device, and liquid crystal display device using same
US10175494B2 (en) 2011-05-18 2019-01-08 Toyobo Co., Ltd. Polarizing plate suitable for liquid crystal display device capable of displaying three-dimensional images, and liquid crystal display device
US10180597B2 (en) 2011-05-18 2019-01-15 Toyobo Co., Ltd. Liquid crystal display device, polarizing plate, and polarizer protection film

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Cited By (15)

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Publication number Priority date Publication date Assignee Title
JP2010002544A (en) * 2008-06-19 2010-01-07 Epson Imaging Devices Corp Liquid crystal display and electronic device
EP2172803A1 (en) * 2008-10-01 2010-04-07 Samsung Electronics Co., Ltd. Liquid crystal display
JP2010152152A (en) * 2008-12-25 2010-07-08 Dainippon Printing Co Ltd Liquid crystal display device
US10054816B2 (en) 2009-11-12 2018-08-21 Toyo Boseki Kabushiki Kaisha Method for improving visibility of liquid crystal display device, and liquid crystal display device using same
US10948764B2 (en) 2009-11-12 2021-03-16 Keio University Method for improving visibility of liquid crystal display device, and liquid crystal display device using the same
WO2011067993A1 (en) 2009-12-03 2011-06-09 シャープ株式会社 Liquid crystal display device
JP2011138152A (en) * 2009-12-03 2011-07-14 Sharp Corp Liquid crystal display device
US8964136B2 (en) 2010-04-09 2015-02-24 Sharp Kabushiki Kaisha Active shutter glasses comprising a half-wave plate disposed at an outer side of a linear polarizing element and a stereoscopic image projection system
US9210412B2 (en) 2010-04-09 2015-12-08 Sharp Kabushiki Kaisha Active shutter glasses and a stereoscopic image projection system wherein viewing angles of a shutter section for the left and right eyes are wider on right and left sides than on upper and lower sides
US9798189B2 (en) 2010-06-22 2017-10-24 Toyobo Co., Ltd. Liquid crystal display device, polarizer and protective film
US9897857B2 (en) 2010-06-22 2018-02-20 Toyobo Co., Ltd. Liquid crystal display device, polarizer and protective film
US10503016B2 (en) 2010-06-22 2019-12-10 Toyobo Co., Ltd. Liquid crystal display device, polarizer and protective film
US10175494B2 (en) 2011-05-18 2019-01-08 Toyobo Co., Ltd. Polarizing plate suitable for liquid crystal display device capable of displaying three-dimensional images, and liquid crystal display device
US10180597B2 (en) 2011-05-18 2019-01-15 Toyobo Co., Ltd. Liquid crystal display device, polarizing plate, and polarizer protection film
JP2011215646A (en) * 2011-07-22 2011-10-27 Keio Gijuku Visibility improving method of liquid crystal display device, and liquid crystal display device using the same

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