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JP2005148119A - Portable information device and attachment thereof - Google Patents

Portable information device and attachment thereof Download PDF

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JP2005148119A
JP2005148119A JP2003381020A JP2003381020A JP2005148119A JP 2005148119 A JP2005148119 A JP 2005148119A JP 2003381020 A JP2003381020 A JP 2003381020A JP 2003381020 A JP2003381020 A JP 2003381020A JP 2005148119 A JP2005148119 A JP 2005148119A
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portable information
information device
shape
display
transparent
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JP4529417B2 (en
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Tatsuya Uchikawa
達也 内川
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NEC Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein in a display device of conventional portable information device, a transparent protection cover covering a liquid crystal panel and a polarizing film is a mere transparent flat plate, and since the display of a liquid crystal element is faithfully only transmitted, a visual field direction capable of visual inspection is restricted, when viewing the display by wearing a polarizing sunglasses. <P>SOLUTION: The display device of the portable information device gives birefrigence on the liquid crystal display panel and the transparent protection cover attached to the display face the front, gives distribution on the thickness to make curvature shape to the display face, and the direction of the polarizing axis of light for outputting the liquid crystal display panel is not fixed in a plane. Thus, even when the polarizing sunglasses is worn, any display can be viewed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、携帯情報機器に関し、とくに、携帯情報機器の液晶表示装置を偏光サングラスをかけて見た場合でも表示が見えなくなることのないように表示装置に複屈折透明保護カバーを装備した携帯情報機器、または携帯情報機器の付属部品に関する。   The present invention relates to a portable information device, and more particularly, to a portable information device equipped with a birefringent transparent protective cover so that the display is not lost even when the liquid crystal display device of the portable information device is viewed with polarized sunglasses. The present invention relates to a device or an accessory part of a portable information device.

液晶表示素子は、低消費電力、軽量などの特徴から、携帯電話やＰＤＡ等の携帯端末やＡＶ機、ゲーム機、デジタルカメラ、フィルムカメラや時計等の携帯機器に広く用いられている。このような携帯情報機器は、屋内での使用のみならず屋外での娯楽や仕事を行う上においても必携のものとなってきている。
屋外においては、とくに夏季にはサングラスを着用する機会が多い。波長フィルタ特性をもつものや偏光特性をもつものなど種々の光学現象を利用したサングラスの中で、偏光サングラスは水辺、路面、建物の照り返しを減ずるため重宝されている。偏光サングラスの偏光特性は、通常、Ｓ波を減光し、Ｐ波を透過するように設定されている。これは、誘電体表面での反射光に含まれる偏光成分は、よく知られているように、Ｓ波成分が強いため、これを遮光することによって、例えば水面での太陽光のぎらつきを防いで、なおかつ水中を透視できるように作られている。
このような偏光サングラスを着用した状態で、携帯情報機器の表示装置を視た時、表示が見にくいことがしばしば起こる。携帯情報機器の表示装置について、図を参照して説明する。図６において、従来の携帯情報機器の表示装置は、液晶表示素子とその液晶表示素子の表示面前面に取り付けられる透明保護カバーで構成される。液晶表示素子では、透過偏光軸を直交させた２枚の偏光フィルムが液晶表示パネルを挟んで構成している。透明保護カバーは、通常はとくに液晶素子の表示光に対して透過波長特性や屈折特性や偏光特性を有さず、基材は透明樹脂の平板である。 Liquid crystal display elements are widely used in portable devices such as mobile phones and PDAs, AV machines, game machines, digital cameras, film cameras, watches, and the like because of their low power consumption and light weight. Such portable information devices have become indispensable not only for indoor use but also for outdoor entertainment and work.
Outside, there are many opportunities to wear sunglasses, especially in summer. Among sunglasses using various optical phenomena such as those having wavelength filter characteristics and those having polarization characteristics, polarized sunglasses are useful for reducing the reflection of watersides, road surfaces, and buildings. The polarization characteristics of polarized sunglasses are usually set so that the S wave is attenuated and the P wave is transmitted. This is because, as is well known, the polarization component included in the reflected light on the dielectric surface has a strong S-wave component, and thus, by blocking this, for example, glare of sunlight on the water surface is prevented. And it is made so that you can see through the water.
When such a polarized sunglasses is worn, it is often difficult to see the display when viewing the display device of the portable information device. A display device of a portable information device will be described with reference to the drawings. In FIG. 6, a display device of a conventional portable information device includes a liquid crystal display element and a transparent protective cover attached to the front surface of the liquid crystal display element. In a liquid crystal display element, two polarizing films having transmission polarization axes orthogonal to each other are configured with a liquid crystal display panel interposed therebetween. The transparent protective cover usually does not have transmission wavelength characteristics, refraction characteristics, or polarization characteristics particularly for display light of a liquid crystal element, and the base material is a flat plate made of transparent resin.

図７に示すように、偏光サングラスをかけて液晶表示素子を見た場合に表示面内で視認が可能な方位が限定されてしまう。液晶表示パネルの表示面側に配設された偏光フィルムの偏光透過軸（図７（Ｃ））と偏光サングラスの偏光透過軸（図７（Ａ））とがたまたま直交した方位関係となった場合、表示が見えなくなることが起こる。通常、例えば携帯電話の主表示素子は、使用者が表示素子を手にもって表示面を縦長にして正視した状態では、このようなことが起こらないように偏光フィルムの偏光透過軸の方位は設定されていると思われるが、最近の携帯電話器では、主表示面をその面内で９０度回転して、横長の画面表示を見る場合もあって、そのような場合上記のような不自由さは残る。また、近年折り畳み型の携帯電話機で、主表示面の背面に副表示素子を配して、現在日時や着信情報等を常に表示するものが多く出回っている。このような電話機では、２つに折り畳んで置かれた状態では、偏光フィルムの偏光透過軸と偏光サングラスの偏光透過軸との方位関係は携帯電話機の置き方によって不定であって、しばしば現在時刻を知ろうとして、斜視したとき表示数字を視認できないということが起こる。   As shown in FIG. 7, when the liquid crystal display element is viewed with polarized sunglasses, orientations that can be visually recognized in the display surface are limited. When the polarization transmission axis of the polarizing film disposed on the display surface side of the liquid crystal display panel (FIG. 7C) and the polarization transmission axis of the polarized sunglasses (FIG. 7A) happen to be orthogonally oriented. The display disappears. Usually, for example, the main display element of a mobile phone is set so that the orientation of the polarization transmission axis of the polarizing film does not occur in such a state that the user holds the display element and looks straight with the display surface vertically long. However, in recent mobile phones, there are cases where the main display surface is rotated 90 degrees within the surface to see a horizontally long screen display. It remains. In recent years, there have been many folding type mobile phones that always display current date and time, incoming call information, etc. by arranging a sub display element on the back of the main display surface. In such a phone, when the phone is folded in two, the orientation relationship between the polarization transmission axis of the polarizing film and the polarization transmission axis of the polarized sunglasses is indefinite depending on how the mobile phone is placed, and the current time is often set. When trying to know, it happens that the displayed numbers are not visible when viewed from the perspective.

液晶表示素子と偏光サングラスの上記のような問題を解決する方法として、液晶パネルの表示面側に、１／４波長板である円偏光フィルタを被せる方法が開示されている（例えば特許文献１参照）。しかしながら、円偏光フィルタが１／４波長の移相特性を常に確保するためには、その厚さの精度を確保する必要があり、また温度変化や湿度による膨潤によって移相特性が変化することを防ぐためには、用いる基材は樹脂では不適当であり硝材にならざるを得ない。このため、部品重量が重くなりまた高コストとなって、携帯情報機器に用いるには不適当である。   As a method for solving the above-mentioned problems of the liquid crystal display element and the polarized sunglasses, a method of covering a circular polarizing filter that is a quarter wavelength plate on the display surface side of the liquid crystal panel is disclosed (for example, see Patent Document 1). ). However, in order for the circularly polarizing filter to always ensure a phase shift characteristic of ¼ wavelength, it is necessary to ensure the accuracy of its thickness, and that the phase shift characteristic changes due to temperature change and swelling due to humidity. In order to prevent this, the base material used is unsuitable for resin and must be glass. For this reason, the weight of the components is increased and the cost is increased, which is inappropriate for use in a portable information device.

特開平１−２０４０９２号公報（第２−３頁、図１）Japanese Patent Laid-Open No. 1-204092 (page 2-3, FIG. 1)

本発明は、上記のような携帯情報機器の表示装置のもつ問題点に鑑みて成されたものであって、その目的は、偏光サングラスをかけた場合にも、表示装置がその表示面内のあらゆる方向から視認が可能である軽量・低コストの携帯情報機器並びにその付属品を提供することにある。   The present invention has been made in view of the problems of the display device of the portable information device as described above. The purpose of the present invention is to provide the display device within the display surface even when wearing polarized sunglasses. The object is to provide a lightweight and low-cost portable information device that can be viewed from all directions and its accessories.

上記の課題を解決するために、本発明の携帯情報機器は、少なくとも表示面側に偏光フィルムを備えた液晶表示素子と、該表示素子を保護する透明カバーを含んだ表示装置を有する携帯情報機器であって、透明カバーは、面内で厚さに分布を有する複屈折材料で構成されている、ことを特徴とする。
複屈折材料の光学的主軸と偏光フィルムの偏光軸とは斜交している。
透明カバーの基材は、樹脂である。
透明カバーは、観察者に対して凸形状を有する。
凸形状は単峰形状である。
凸形状は複峰形状である。
複峰形状は、レンチキュラレンズ状の形状である。
複峰形状は、蠅の目レンズ状の形状である。 In order to solve the above-described problems, a portable information device of the present invention includes a liquid crystal display element having a polarizing film at least on the display surface side and a display device including a transparent cover that protects the display element. The transparent cover is made of a birefringent material having a thickness distribution in the plane.
The optical principal axis of the birefringent material and the polarization axis of the polarizing film are oblique.
The base material of the transparent cover is a resin.
The transparent cover has a convex shape with respect to the observer.
The convex shape is a single peak shape.
The convex shape is a bimodal shape.
The bimodal shape is a lenticular lens shape.
The bimodal shape is the shape of a lenticular lens.

また、本発明の携帯情報機器は、少なくとも表示面側に偏光フィルムを備えた液晶表示素子を含む表示装置を有する携帯情報機器であって、透明でかつ表示装置へ着脱可能な付属部品を有することを特徴とする。
透明でかつ着脱可能な付属部品は、面内で厚さに分布を有する複屈折材料で構成されている。
複屈折材料の光学的主軸と偏光フィルムの偏光軸とは斜交している。
透明でかつ着脱可能な付属部品の基材は、樹脂である。
透明でかつ着脱可能な付属部品は、観察者に対して凸形状を有する。
凸形状は単峰形状である。
凸形状は複峰形状である。
複峰形状は、レンチキュラレンズ状の形状である。
複峰形状は、蠅の目レンズ状の形状である。 The portable information device of the present invention is a portable information device having a display device including a liquid crystal display element having a polarizing film at least on the display surface side, and has a transparent and detachable accessory part to the display device. It is characterized by.
The transparent and detachable accessory is made of a birefringent material having a thickness distribution in the plane.
The optical principal axis of the birefringent material and the polarization axis of the polarizing film are oblique.
The base material of the accessory that is transparent and detachable is a resin.
The transparent and detachable accessory has a convex shape with respect to the observer.
The convex shape is a single peak shape.
The convex shape is a bimodal shape.
The bimodal shape is a lenticular lens shape.
The bimodal shape is the shape of a lenticular lens.

また、本発明の携帯情報機器の付属部品は、少なくとも表示面側に偏光フィルムを備えた液晶表示素子を含む表示装置を有する携帯情報機器の透明でかつ表示装置へ着脱可能な付属部品であって、透明でかつ着脱可能な付属部品は、面内で厚さに分布を有する複屈折材料で構成されている、ことを特徴とする。
複屈折材料の光学的主軸と偏光フィルムの偏光軸とは斜交している。
透明でかつ着脱可能な付属部品の基材は、樹脂である。
透明でかつ着脱可能な付属部品は、観察者に対して凸形状を有する。
凸形状は単峰形状である。
凸形状は複峰形状である。
複峰形状は、レンチキュラレンズ状の形状である。
複峰形状は、蠅の目レンズ状の形状である。 Further, the accessory part of the portable information device of the present invention is a transparent accessory of the portable information device having a display device including a liquid crystal display element provided with a polarizing film at least on the display surface side, and detachable from the display device. The transparent and detachable accessory is characterized in that it is composed of a birefringent material having a thickness distribution in the plane.
The optical principal axis of the birefringent material and the polarization axis of the polarizing film are oblique.
The base material of the accessory that is transparent and detachable is a resin.
The transparent and detachable accessory has a convex shape with respect to the observer.
The convex shape is a single peak shape.
The convex shape is a bimodal shape.
The bimodal shape is a lenticular lens shape.
The bimodal shape is the shape of a lenticular lens.

本発明では、透明保護カバーが複屈折を有しかつ曲率を持っているために、液晶表示パネルを透過した光の偏光特性が表示面全体で一定の方向を向いておらず場所によって異なるため、偏光サングラスをかけた場合でも、表示面が面内でどのような方位に向いていても表示の視認が可能となる。   In the present invention, since the transparent protective cover has birefringence and has a curvature, the polarization characteristics of the light transmitted through the liquid crystal display panel are not directed in a certain direction over the entire display surface, and thus vary depending on the location. Even when wearing polarized sunglasses, the display can be visually recognized regardless of the orientation of the display surface in the plane.

本発明の実施の形態について図面を参照して説明する。   Embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の第１の実施例としての携帯情報機器の表示装置の断面構成図（図１（Ａ））と表示装置部分の上面図（図１（Ｂ））を示す。図１（Ａ）に示すように、携帯情報機器の表示装置は、液晶表示パネル１を偏光軸が直交した偏光フィルム２、３によって挟んで有し、さらに、強度、防水性等を考慮して、透明保護カバー４が筐体５に固定設置されている。その透明保護カバー４は、透明樹脂の成形品である。
本発明では、この透明保護カバー４の形状と光学特性に特徴を持つ。図１では、透明保護カバー４は、液晶表示パネルに接する側の面とは反対側の面のみに曲率を持たせた半円状の断面形状としている。ここでは、この形状は、液晶表示パネルの表示の視認性及び透明保護カバーの加工性を考慮した周辺に比べて中心部が盛り上がった円筒形状としている。
樹脂でできている透明保護カバー４は、複屈折性を有しており、図１（Ｂ）に示すように、屈折率楕円体のＺ軸すなわちＣ軸６は、液晶表示素子の表示面側の偏光フィルム２の透過偏光軸に対して４５度程度傾いて斜交している。
そして、円筒形状の一部で構成されている透明保護カバー４の厚さが厚い中心部では、複屈折による位相差が１／２波長の奇数倍程度にしてある。すなわち、中心部では透過光が９０度の偏光回転を受け、中心部を離れるに従って偏光回転が減ずるように設定されている。 FIG. 1 shows a cross-sectional configuration diagram (FIG. 1 (A)) of a display device of a portable information device as a first embodiment of the present invention and a top view (FIG. 1 (B)) of the display device portion. As shown in FIG. 1A, the display device of a portable information device has a liquid crystal display panel 1 sandwiched between polarizing films 2 and 3 whose polarization axes are orthogonal to each other, and further considers strength, waterproofness, and the like. The transparent protective cover 4 is fixedly installed on the housing 5. The transparent protective cover 4 is a molded product of transparent resin.
The present invention is characterized by the shape and optical characteristics of the transparent protective cover 4. In FIG. 1, the transparent protective cover 4 has a semicircular cross-sectional shape in which only the surface opposite to the surface in contact with the liquid crystal display panel has a curvature. Here, this shape is a cylindrical shape whose center is raised compared to the periphery in consideration of the visibility of the display of the liquid crystal display panel and the workability of the transparent protective cover.
The transparent protective cover 4 made of resin has birefringence, and as shown in FIG. 1B, the Z axis of the refractive index ellipsoid, that is, the C axis 6 is on the display surface side of the liquid crystal display element. The polarizing film 2 is inclined at an angle of about 45 degrees with respect to the transmission polarization axis.
And in the central part where the thickness of the transparent protective cover 4 formed of a part of the cylindrical shape is thick, the phase difference due to birefringence is set to an odd multiple of ½ wavelength. That is, it is set so that the transmitted light undergoes a 90 ° polarization rotation at the center, and the polarization rotation decreases as the center moves away.

図２は、携帯情報機器の表示装置を見る観察者が掛ける偏光サングラスの透過偏光軸（図２（Ａ））と、偏光フィルムを持った液晶表示素子出力光の偏光軸（図２（Ｃ））と、透明保護カバーを透過した光の偏光軸（図２（Ｂ））との関係を示す。
例えば、液晶表示パネルの光出力側に設けた偏光フィルタ２の透過偏光軸が横方向の場合、透明保護カバーを通すと、透明保護カバーには円筒状の曲率が施されているため、光の透過する場所によって偏光軸は一定方向ではなく、模式的には図２（Ｂ）のようなイメージとなる。
一方、偏光サングラスの透過する光の偏光軸は、通常、図示のように縦方向のものが多い。本発明の透明保護カバー３によって、偏光フィルム２を透過した光の偏光は、透明保護カバー３を透過する位置によって偏光回転の受け方が異なる。円筒の厚い部分を透過した直線偏光は、９０度回転を受け、変更状態が偏光サングラスの透過偏光軸と一致するため、液晶表示素子の表示が観察者には明るく見え、周辺部は暗く見える。
仮に温度の変化や湿度の変化によって、透明保護カバー４の複屈折の大きさが変わり、厚さの厚い中心部で偏光回転角が９０度を上回って、少し暗くなっても、中心部より厚さが少し薄い部分での偏光回転角が９０度となって、その部分の表示が明るく見えるようになる。
また、液晶表示素子を９０度面内で回転した時は、透明保護カバーの厚さの厚い中心部分を透過した光の偏光は偏光サングラスの透過偏光軸と直交するため、表示が少し暗くなるが、厚さの薄い周辺部の表示が明るく見える。このため常に表示画面全体が見えなくなることはない。 FIG. 2 shows a transmission polarization axis of polarized sunglasses (FIG. 2A) worn by an observer who watches a display device of a portable information device, and a polarization axis of liquid crystal display element output light having a polarization film (FIG. 2C). ) And the polarization axis (FIG. 2B) of the light transmitted through the transparent protective cover.
For example, when the transmission polarization axis of the polarizing filter 2 provided on the light output side of the liquid crystal display panel is in the horizontal direction, if the transparent protective cover is passed, the transparent protective cover has a cylindrical curvature. Depending on the transmission location, the polarization axis is not a fixed direction, and an image as shown in FIG.
On the other hand, the polarization axis of light transmitted through polarized sunglasses usually has a vertical direction as shown in the figure. With the transparent protective cover 3 of the present invention, the polarization of the light transmitted through the polarizing film 2 is different in the way of polarization rotation depending on the position through which the transparent protective cover 3 is transmitted. The linearly polarized light transmitted through the thick part of the cylinder is rotated 90 degrees and the change state coincides with the transmission polarization axis of the polarized sunglasses, so that the display on the liquid crystal display element looks bright to the observer and the peripheral part looks dark.
If the temperature and humidity change, the birefringence of the transparent protective cover 4 changes, and even if the polarization rotation angle exceeds 90 degrees in the thick central part and becomes a little dark, it is thicker than the central part. The polarization rotation angle in a slightly thin part becomes 90 degrees, and the display of that part appears bright.
In addition, when the liquid crystal display element is rotated in the 90-degree plane, the polarization of the light transmitted through the thick central portion of the transparent protective cover is orthogonal to the transmission polarization axis of the polarized sunglasses, so the display is slightly darkened. The thin peripheral display looks bright. For this reason, the entire display screen is not always lost.

図３は、本発明の第２の実施例を示す図であって、図３（Ａ）は透明保護カバーの断面、図３（Ｂ）は、透明保護カバーを透過した光の変更状態、図３（Ｃ）は、偏光サングラスを透過した光の強度分布を示す図である。
図３の透明保護カバー４の主面の一面は、中心部が厚い球面状を成している。透明樹脂でできている透明保護カバー４は、複屈折を有し、Ｃ軸は液晶表示素子の表示面側の偏光フィルム２の透過偏光軸に対して４５度程度傾いている。
そして、球面形状の一部で構成されている透明保護カバー３の厚さが厚い中心部では、複屈折による位相差が１／２波長の奇数倍程度に作ってある。すなわち、中心部では透過光が９０度の偏光回転を受け、中心部を離れるに従ってＣ軸とこれに直交する軸に対する偏光成分間の位相差が減ずるように設定されており（図３（Ｂ））、厚さが減ずるに応じて楕円偏光→円偏光→楕円偏光と推移する。偏光サングラスを透過する光の強度は、透明保護カバーの中心を最大として点対称の放射状に小さくなる。
仮に温度の変化や湿度の変化によって、透明保護カバー４の複屈折の大きさが変わり、厚さの厚い中心部で偏光回転角が９０度を上回って、少し暗くなっても、中心部より厚さが少し薄い部分での偏光回転角が９０度となって、その部分の表示が明るく見えるようになる。
また、液晶表示素子を９０度面内で回転した時は、透明保護カバーの厚さの厚い中心部分を透過した光の偏光は偏光サングラスの透過偏光軸と直交するため、表示が少し暗くなるが、厚さの薄い周辺部の表示が明るく見える。このため常に表示画面全体が見えなくなることはない。 3A and 3B are diagrams showing a second embodiment of the present invention, in which FIG. 3A is a cross-sectional view of a transparent protective cover, FIG. 3B is a change state of light transmitted through the transparent protective cover, and FIG. 3 (C) is a diagram showing an intensity distribution of light transmitted through polarized sunglasses.
One surface of the main surface of the transparent protective cover 4 in FIG. 3 has a spherical shape with a thick central portion. The transparent protective cover 4 made of a transparent resin has birefringence, and the C axis is inclined about 45 degrees with respect to the transmission polarization axis of the polarizing film 2 on the display surface side of the liquid crystal display element.
And in the central part where the thickness of the transparent protective cover 3 constituted by a part of the spherical shape is thick, the phase difference due to birefringence is made to be an odd multiple of 1/2 wavelength. In other words, the transmitted light undergoes a 90 ° polarization rotation at the center, and the phase difference between the polarization components with respect to the C axis and the axis perpendicular thereto decreases as the distance from the center increases (FIG. 3B). ) As the thickness decreases, the transition is from elliptically polarized light to circularly polarized light to elliptically polarized light. The intensity of light transmitted through the polarized sunglasses decreases radially in a point-symmetric manner with the center of the transparent protective cover as a maximum.
If the temperature and humidity change, the birefringence of the transparent protective cover 4 changes, and even if the polarization rotation angle exceeds 90 degrees in the thick central part and becomes a little dark, it is thicker than the central part. The polarization rotation angle in a slightly thin part becomes 90 degrees, and the display of that part appears bright.
In addition, when the liquid crystal display element is rotated in the 90-degree plane, the polarization of the light transmitted through the thick central portion of the transparent protective cover is orthogonal to the transmission polarization axis of the polarized sunglasses, so the display is slightly darkened. The thin peripheral display looks bright. For this reason, the entire display screen is not always lost.

図４は、本発明の第３の実施例の、透明保護カバーの構成を示す。第１の実施例や第２の実施例では、透明保護カバーの円筒形状や球面形状は１つの曲面で構成されているが、複数で構成しても本発明の効果は得られる。図４（Ａ）は複数の円筒面で構成したレンチキュラー状の場合であり、図４（Ｂ）〜（Ｅ）はフライアイ（蠅の目）状に構成した場合である。図４（Ｂ）、（Ｃ）、（Ｅ）は球面、（Ｄ）は回転楕円面である。   FIG. 4 shows the configuration of the transparent protective cover according to the third embodiment of the present invention. In the first embodiment and the second embodiment, the cylindrical shape and the spherical shape of the transparent protective cover are configured by one curved surface, but the effect of the present invention can be obtained even when the transparent protective cover is configured by a plurality. FIG. 4A shows a case of a lenticular shape formed by a plurality of cylindrical surfaces, and FIGS. 4B to 4E show a case of a fly eye shape. 4B, 4C, and 4E are spherical surfaces, and FIG. 4D is a spheroid.

図５には、本発明の第４の実施例の構成を示す。第４の実施例は、偏光フィルムと液晶表示パネルと透明保護カバーから成る液晶表示装置は、図６に示した透明保護カバーが複屈折性を持たない従来の構成であって、複屈折性を有する第２の透明保護カバーを付属品としてその上から被せる場合を示している。図５では、折り畳み型携帯電話機の主表示装置に被せた場合（図５（Ａ））と、主表示装置の背面に設けた副表示装置に被せた場合（図５（Ｂ））の例を示している。
アタッチメントとしての第２の透明保護カバーのもつ曲面は、実施例１〜３のいずれであってもよい。 FIG. 5 shows the configuration of the fourth embodiment of the present invention. In the fourth embodiment, a liquid crystal display device comprising a polarizing film, a liquid crystal display panel, and a transparent protective cover has a conventional structure in which the transparent protective cover shown in FIG. The case where the 2nd transparent protective cover which has is covered from the top as an accessory is shown. FIG. 5 shows an example of a case where the main display device of the foldable mobile phone is put on (FIG. 5A) and a case where it is put on the sub display device provided on the back of the main display device (FIG. 5B). Show.
The curved surface of the second transparent protective cover as the attachment may be any of the first to third embodiments.

尚、上記の実施例の説明において、複屈折を有する透明保護カバーの光学的主軸と液晶表示装置がもつ表示面側の偏光フィルムの偏光軸とが成す角度は、４５度に限るものではなく、平行または直交を除いた任意の角度であっても本発明の効果は得られる。
また、透明保護カバーの観察者を向く主面は、観察者に対して凸形状を成す場合を説明したが、凹形状であっても本発明の効果は得られる。また、両主面とも凸形状、または、両主面とも凹形状であってもよい。 In the description of the above embodiment, the angle formed by the optical principal axis of the transparent protective cover having birefringence and the polarization axis of the polarizing film on the display surface side of the liquid crystal display device is not limited to 45 degrees, The effect of the present invention can be obtained even at an arbitrary angle excluding parallel or orthogonal.
Moreover, although the main surface which faces the observer of a transparent protective cover demonstrated the case where a convex shape was comprised with respect to the observer, the effect of this invention is acquired even if it is a concave shape. Moreover, both main surfaces may be convex, or both main surfaces may be concave.

本発明の携帯情報機器の表示装置における透明保護カバーの第１の実施例の構成を示す図である。It is a figure which shows the structure of the 1st Example of the transparent protective cover in the display apparatus of the portable information device of this invention. 本発明の携帯情報機器の表示装置における透明保護カバーの第１の実施例の動作を示す図である。It is a figure which shows operation | movement of the 1st Example of the transparent protective cover in the display apparatus of the portable information device of this invention. 本発明の携帯情報機器の表示装置における透明保護カバーの第２の実施例の構成と動作を示す図である。It is a figure which shows the structure and operation | movement of the 2nd Example of the transparent protective cover in the display apparatus of the portable information device of this invention. 本発明の携帯情報機器の表示装置における透明保護カバーの第３の実施例の構成を示す図である。It is a figure which shows the structure of the 3rd Example of the transparent protective cover in the display apparatus of the portable information device of this invention. 本発明の携帯情報機器の表示装置における透明保護カバーの第４の実施例の構成を示す図である。It is a figure which shows the structure of the 4th Example of the transparent protective cover in the display apparatus of the portable information device of this invention. 従来の携帯情報機器の表示装置における透明保護カバーの構成を示す図である。It is a figure which shows the structure of the transparent protective cover in the display apparatus of the conventional portable information device. 従来の携帯情報機器の表示装置における透明保護カバーの動作を示す図である。It is a figure which shows operation | movement of the transparent protective cover in the display apparatus of the conventional portable information device.

符号の説明Explanation of symbols

１ 液晶表示パネル
２、３ 偏光フィルム
４ 透明保護カバー
５ 筐体
６ Ｃ軸
DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Polarizing film 4 Transparent protective cover 5 Case 6 C axis

Claims (25)

少なくとも表示面側に偏光フィルムを備えた液晶表示素子と、該表示素子を保護する透明カバーを含んだ表示装置を有する携帯情報機器であって、
前記透明カバーは、面内で厚さに分布を有する複屈折材料で構成されている、
ことを特徴とする携帯情報機器。 A portable information device having a display device including a liquid crystal display element having a polarizing film on at least the display surface side and a transparent cover for protecting the display element,
The transparent cover is made of a birefringent material having a thickness distribution in the plane,
A portable information device characterized by that. 前記複屈折材料の光学的主軸と前記偏光フィルムの偏光軸とは、
斜交している、
ことを特徴とする請求項１に記載の携帯情報機器。 The optical principal axis of the birefringent material and the polarization axis of the polarizing film are:
Crossed,
The portable information device according to claim 1. 前記透明カバーの基材は、樹脂である、
ことを特徴とする請求項１に記載の携帯情報機器。 The base material of the transparent cover is a resin,
The portable information device according to claim 1. 前記透明カバーは、前記観察者に対して凸形状を有する、
ことを特徴とする請求項１に記載の携帯情報機器。 The transparent cover has a convex shape with respect to the observer;
The portable information device according to claim 1. 前記凸形状は単峰形状である、
ことを特徴とする請求項４に記載の携帯情報機器。 The convex shape is a single peak shape,
The portable information device according to claim 4. 前記凸形状は複峰形状である、
ことを特徴とする請求項４に記載の携帯情報機器。 The convex shape is a bimodal shape,
The portable information device according to claim 4. 前記複峰形状は、レンチキュラレンズ状の形状である、
ことを特徴とする請求項６に記載の携帯情報機器。 The bimodal shape is a lenticular lens shape,
The portable information device according to claim 6. 前記複峰形状は、蠅の目レンズ状の形状である、
ことを特徴とする請求項６に記載の携帯情報機器。 The bimodal shape is a shape of an eyelet lens,
The portable information device according to claim 6. 少なくとも表示面側に偏光フィルムを備えた液晶表示素子を含む表示装置を有する携帯情報機器であって、
透明でかつ前記表示装置へ着脱可能な付属部品を有する、
ことを特徴とする携帯情報機器。 A portable information device having a display device including a liquid crystal display element provided with a polarizing film at least on the display surface side,
Having an accessory that is transparent and detachable from the display device;
A portable information device characterized by that. 前記透明でかつ着脱可能な付属部品は、面内で厚さに分布を有する複屈折材料で構成されている、
ことを特徴とする請求項９に記載の携帯情報機器。 The transparent and detachable accessory is composed of a birefringent material having a thickness distribution in the plane,
The portable information device according to claim 9. 前記複屈折材料の光学的主軸と前記偏光フィルムの偏光軸とは、
斜交している、
ことを特徴とする請求項９に記載の携帯情報機器。 The optical principal axis of the birefringent material and the polarization axis of the polarizing film are:
Crossed,
The portable information device according to claim 9. 前記透明でかつ着脱可能な付属部品の基材は、樹脂である、
ことを特徴とする請求項９に記載の携帯情報機器。 The transparent and detachable accessory base material is a resin,
The portable information device according to claim 9. 前記透明でかつ着脱可能な付属部品は、前記観察者に対して凸形状を有する、
ことを特徴とする請求項９に記載の携帯情報機器。 The transparent and detachable accessory has a convex shape with respect to the observer,
The portable information device according to claim 9. 前記凸形状は単峰形状である、
ことを特徴とする請求項１３に記載の携帯情報機器。 The convex shape is a single peak shape,
The portable information device according to claim 13. 前記凸形状は複峰形状である、
ことを特徴とする請求項１３に記載の携帯情報機器。 The convex shape is a bimodal shape,
The portable information device according to claim 13. 前記複峰形状は、レンチキュラレンズ状の形状である、
ことを特徴とする請求項１５に記載の携帯情報機器。 The bimodal shape is a lenticular lens shape,
The portable information device according to claim 15. 前記複峰形状は、蠅の目レンズ状の形状である、
ことを特徴とする請求項１５に記載の携帯情報機器。 The bimodal shape is a shape of an eyelet lens,
The portable information device according to claim 15. 少なくとも表示面側に偏光フィルムを備えた液晶表示素子を含む表示装置を有する携帯情報機器の透明でかつ前記表示装置へ着脱可能な付属部品であって、
前記透明でかつ着脱可能な付属部品は、面内で厚さに分布を有する複屈折材料で構成されている、
ことを特徴とする携帯情報機器の付属部品。 It is a transparent portable information device having a display device including a liquid crystal display element provided with a polarizing film at least on the display surface side, and is an accessory that can be attached to and detached from the display device,
The transparent and detachable accessory is composed of a birefringent material having a thickness distribution in the plane,
An accessory for a portable information device. 前記複屈折材料の光学的主軸と前記偏光フィルムの偏光軸とは、
斜交している、
ことを特徴とする請求項１８に記載の携帯情報機器の付属部品。 The optical principal axis of the birefringent material and the polarization axis of the polarizing film are:
Crossed,
The accessory part of the portable information device according to claim 18. 前記透明でかつ着脱可能な付属部品の基材は、樹脂である、
ことを特徴とする請求項１８に記載の携帯情報機器の付属部品。 The transparent and detachable accessory base material is a resin,
The accessory part of the portable information device according to claim 18. 前記透明でかつ着脱可能な付属部品は、前記観察者に対して凸形状を有する、
ことを特徴とする請求項１８に記載の携帯情報機器の付属部品。 The transparent and detachable accessory has a convex shape with respect to the observer,
The accessory part of the portable information device according to claim 18. 前記凸形状は単峰形状である、
ことを特徴とする請求項２１に記載の携帯情報機器の付属部品。 The convex shape is a single peak shape,
The accessory part of the portable information device according to claim 21. 前記凸形状は複峰形状である、
ことを特徴とする請求項２１に記載の携帯情報機器の付属部品。 The convex shape is a bimodal shape,
The accessory part of the portable information device according to claim 21. 前記複峰形状は、レンチキュラレンズ状の形状である、
ことを特徴とする請求項２３に記載の携帯情報機器の付属部品。 The bimodal shape is a lenticular lens shape,
The accessory part of the portable information device according to claim 23. 前記複峰形状は、蠅の目レンズ状の形状である、
ことを特徴とする請求項２３に記載の携帯情報機器の付属部品。
The bimodal shape is a shape of an eyelet lens,
The accessory part of the portable information device according to claim 23.
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