TW202111361A - Liquid crystal display device - Google Patents

Abstract

The purpose of the present invention is to provide a liquid crystal display device that has superior color reproducibility, superior visibility when viewed through an optical member, said optical member having a polarizing effect, and minimized color irregularity. A liquid crystal display device according to the present invention comprises: a liquid crystal panel that includes a liquid crystal cell, a first polarizer positioned on a viewing side of the liquid crystal cell, and a second polarizer positioned on a back surface side; a phase difference layer that is positioned on the viewing side of the liquid crystal panel; and a backlight light source that illuminates the liquid crystal panel from the back surface side. The in-plane phase difference Re(550) of the phase difference layer is 100nm-180nm and satisfies the relationship Re(450) < Re(550) < Re(650). The angle formed by the slow axis of the phase difference layer and a long side of the liquid crystal panel is 35 DEG - 55 DEG. The backlight light source has a discontinuous emission spectrum.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device.

In recent years, opportunities for using liquid crystal display devices under strong external light, such as mobile phones, smart phones, tablet personal computers (PCs), car navigation systems, digital signs, and window displays, have increased. When the liquid crystal display device is used outdoors as described above, when the viewer wears polarized sunglasses to observe the liquid crystal display device, according to the viewing angle of the viewer, the direction of the transmission axis of the polarized sunglasses and the emission of the liquid crystal display device The direction of the transmission axis on the side becomes a state of orthogonal polarization. As a result, the screen may become black and the displayed image may not be visible. In order to solve this problem, a technique of arranging a λ/4 plate or ultra-high retardation film on the viewing side of the liquid crystal display device has been proposed. On the other hand, in order to improve the color reproducibility of liquid crystal display devices, attempts have been made to make the backlight light source close to the characteristics of individual light sources for red (R), green (G), and blue (B). However, in such an attempt, even if a λ/4 plate or an ultra-high retardation film is arranged only on the viewing side of the liquid crystal display device as a countermeasure for polarized sunglasses, there are problems such as coloration and/or color unevenness. [Prior Technical Literature] [Patent Literature] [Patent Document 1] Japanese Patent Laid-Open No. 2005-352068 [Patent Document 2] Japanese Patent Laid-Open No. 2011-107198

[The problem to be solved by the invention] The present invention was made in order to solve the aforementioned problems, and its object is to provide a liquid crystal display device that has excellent color reproducibility, excellent visibility when viewed by an optical member having a polarizing effect, and suppressed color unevenness. [Technical means to solve the problem] The liquid crystal display device of the present invention includes a liquid crystal panel including a liquid crystal cell, a first polarizing element arranged on the visible side of the liquid crystal cell, and a second polarizing element arranged on the back side of the liquid crystal cell; a retardation layer, which It is arranged on the visible side of the liquid crystal panel; and a backlight light source which illuminates the liquid crystal panel from the back side. The in-plane retardation Re(550) of the retardation layer is 100 nm to 180 nm, and satisfies the relationship of Re(450)<Re(550)<Re(650). The angle formed by the retardation axis of the retardation layer and the long side of the liquid crystal panel is 35°-55°. The backlight light source has a non-continuous emission spectrum. In one embodiment, the emission spectrum of the backlight light source has a peak P1 in the wavelength region of 430 nm to 470 nm, a peak P2 in the wavelength region of 530 nm to 570 nm, and a peak in the wavelength region of 630 nm to 670 nm P3. Set the wavelength of the peak P1 to λ1, set the height to hP1 and set the half-value width to Δλ1, set the wavelength of the peak P2 to λ2, set the height to hP2 and set the half-value width to Δλ2, set the peak P3 Set the wavelength of λ3 to λ3, set the height to hP3, set the half-value width to Δλ3, set the height of the trough between peak P1 and peak P2 to hB1, set the height of the trough between peak P2 and peak P3 as For hB2, these satisfy the following relational expressions (1)～(3): (λ2－λ1)/(Δλ2＋Δλ1)＞1・・・(1) (λ3－λ2)/(Δλ3＋Δλ2)＞1・・・(2) 0.8≦{hP2－(hB2＋hB1)/2}/hP2≦1・・・(3). In one embodiment, the refractive index ellipsoid of the retardation layer shows a relationship of nx>nz>ny, and the Nz coefficient is 0.2 to 0.8. In one embodiment, the liquid crystal display device further includes another retardation layer whose refractive index ellipsoid shows a relationship of nz>nx≧ny between the liquid crystal panel and the retardation layer. In one embodiment, the above-mentioned backlight light source includes red-emitting LED (Light Emitting Diode), green-emitting LED, and blue-emitting LED, and the fluorescent system of the red-emitting LED is tetravalent Manganese ion is activated. In another embodiment, the aforementioned backlight light source includes a blue-emitting LED and a wavelength conversion layer including quantum dots. In one embodiment, the absorption axis of the first polarizing element is substantially orthogonal or parallel to the long side of the liquid crystal panel, and the absorption axis of the second polarizing element is substantially orthogonal or parallel to the long side of the liquid crystal panel. Parallel, the absorption axis of the first polarizing element and the absorption axis of the second polarizing element are substantially orthogonal. [Effects of Invention] According to the embodiment of the present invention, by using a backlight light source with a specific emission spectrum, the retardation layer having a so-called inverse dispersion wavelength dependence and a specific in-plane phase difference is arranged on the viewing side at a specific axis angle , It is possible to realize a liquid crystal display device with excellent color reproducibility, excellent visibility when viewed through an optical member with a polarizing effect, and suppression of color unevenness.

(附相位差層之偏光板之製作) 針對以與實施例1相同之方式獲得之PET膜與偏光元件之積層體，經由UV硬化型接著劑將上述液晶固化層以將基材膜去除時之基材膜之剝離方向與偏光元件之吸收軸實質上成為平行之方式貼附於與PET膜為相反側之面。進而，將上述基材膜去除，並經由UV硬化型接著劑將以與實施例1相同之方式製作之相位差膜A以其遲相軸與偏光元件之吸收軸之角度實質上成為45°之方式貼附於液晶固化層之與偏光元件相反之側。進而，將PET膜自該積層體剝離後，經由UV硬化型接著劑貼合丙烯酸系保護膜，或者視需要貼合相位差層，而製作附相位差層之偏光板。 (液晶顯示裝置之製作) 使用上述附相位差層之偏光板、及使用具備不同之背光光源之智慧型手機，除此以外，以與實施例1相同之方式製作液晶顯示裝置。使該液晶顯示裝置顯示白色圖像，並於白色圖像狀態下對通過偏光太陽眼鏡之視認性進行評價。將評價結果示於表1。 ＜實施例4＞ (構成第1相位差層之相位差膜C之製作) 將以與實施例1相同之方式獲得之聚碳酸酯樹脂於80℃下真空乾燥5小時後，使用具備單軸擠出機(五十鈴化工機公司製造，螺桿直徑25 mm，汽缸設定溫度：220℃)、T字模(寬度900 mm，設定溫度：220℃)、冷卻輥(設定溫度：125℃)及捲取機之膜製膜裝置，製作厚度130 μm之聚碳酸酯樹脂膜。所獲得之聚碳酸酯樹脂膜之吸水率為1.2%。 利用依據日本專利特開2014-194483號公報之實施例1之方法使上述聚碳酸酯樹脂膜傾斜延伸，獲得相位差膜C。 相位差膜C之具體之製作順序如下所述：將聚碳酸酯樹脂膜(厚度130 μm，寬度765 mm)於延伸裝置之預熱區域預熱至142℃。於預熱區域，左右之夾具之夾具間距為125 mm。繼而，將膜放入至第1傾斜延伸區域C1，同時開始增大右側夾具之夾具間距，於第1傾斜延伸區域C1自125 mm增大至177.5 mm。夾具間距變化率為1.42。於第1傾斜延伸區域C1，關於左側夾具之夾具間距，開始減少夾具間距，於第1傾斜延伸區域C1自125 mm減少至90 mm。夾具間距變化率為0.72。進而，將膜放入至第2傾斜延伸區域C2，同時開始增大左側夾具之夾具間距，於第2傾斜延伸區域C2自90 mm增大至177.5 mm。另一方面，右側夾具之夾具間距於第2傾斜延伸區域C2維持為177.5 mm。又，與上述傾斜延伸同時地亦於寬度方向上進行1.9倍之延伸。再者，上述傾斜延伸係於135℃下進行。繼而，於收縮區域進行MD收縮處理。具體而言，使左側夾具及右側夾具之夾具間距均自177.5 mm減少至165 mm。MD收縮處理中之收縮率為7.0%。 以如上方式獲得相位差膜C(厚度40 μm)。所獲得之相位差膜C之Re(550)為140 nm，Rth(550)為168 nm，Re(450)/Re(550)為0.89。相位差膜C之遲相軸方向相對於長度方向為45°。 (附相位差層之偏光板及液晶顯示裝置之製作) 使用上述相位差膜C代替相位差膜A，除此以外，以與實施例1相同之方式製作附相位差層之偏光板，使用該附相位差層之偏光板，除此以外，以與實施例1相同之方式製作液晶顯示裝置。使該液晶顯示裝置顯示白色圖像，並於白色圖像狀態下對通過偏光太陽眼鏡之視認性進行評價。將評價結果示於表1。 ＜比較例1＞ (構成第1相位差層之相位差膜D之製作) 經由丙烯酸系黏著劑層(厚度15 μm)將雙軸延伸聚丙烯膜(Toray製造，商品名「Torayfan」(厚度60 μm))貼合於市售之ARTON膜(JSR公司製造，厚度70 μm)之兩側。其後，利用輥延伸機保持膜之長度方向並於147℃之空氣循環式恆溫烘箱內使之延伸至1.45倍而獲得相位差膜D。所獲得之相位差膜D之Re(550)為140 nm，Rth(550)為70 nm，Re(450)/Re(550)為1.00。 (附相位差層之偏光板及液晶顯示裝置之製作) 使用上述相位差膜D代替相位差膜A，除此以外，以與實施例1相同之方式製作附相位差層之偏光板，使用該附相位差層之偏光板，除此以外，以與實施例1相同之方式製作液晶顯示裝置。使該液晶顯示裝置顯示白色圖像，並於白色圖像狀態下對通過偏光太陽眼鏡之視認性進行評價。將評價結果示於表1。 ＜比較例2＞ (構成第1相位差層之相位差膜E之製作) 針對市售之ARTON膜(JSR公司製造，厚度100 μm)，利用輥延伸機保持膜之長度方向，並於147℃之空氣循環式恆溫烘箱內使之延伸至1.8倍而獲得相位差膜E。所獲得之相位差膜E之Re(550)為140 nm，Rth(550)為140 nm，Re(450)/Re(550)為1.00。 (附相位差層之偏光板之製作) 使用上述相位差膜E，除此以外，以與實施例1相同之方式製作附相位差層之偏光板。 (液晶顯示裝置之製作) 自具備IPS方式之液晶顯示裝置之智慧型手機(Apple公司製造iphone5：背光光源之發光光譜為連續)之液晶顯示裝置中取出液晶面板，將配置於液晶單元之視認側之偏光板去除，並將該液晶單元之玻璃面洗淨。接下來，經由丙烯酸系黏著劑(厚度20 μm)將上述附相位差板之偏光板之偏光元件側之面以偏光元件之吸收軸相對於該液晶單元之初始配向方向成為正交之方式積層於上述液晶單元之視認側之表面而獲得液晶面板。將積層有附相位差板之偏光板之上述液晶面板安裝於上述智慧型手機而作為本實施例之液晶顯示裝置。使該液晶顯示裝置顯示白色圖像，並於白色圖像狀態下對通過偏光太陽眼鏡之視認性進行評價。將評價結果示於表1。 ＜比較例3＞ (構成第1相位差層之相位差膜F之製作) 使用作為碳酸酯前驅物質之碳醯氯、作為芳香族二價苯酚成分之(A)2,2-雙(4-羥基苯基)丙烷及(B)1,1-雙(4-羥基苯基)-3,3,5-三甲基環己烷，並依據常規方法獲得(A)：(B)之重量比為4：6並且包含重量平均分子量(Mw)為60,000之下述化學式(II)及(III)之重複單元之聚碳酸酯系樹脂[數量平均分子量(Mn)＝33,000，Mw/Mn＝1.78]。將上述聚碳酸酯系樹脂70重量份及重量平均分子量(Mw)為1,300之苯乙烯系樹脂[數量平均分子量(Mn)＝716，Mw/Mn＝1.78](三洋化成製造之HIMER SB75)30重量份添加至二氯甲烷300重量份中，並於室溫下攪拌混合4小時而獲得透明之溶液。將該溶液澆鑄於玻璃板上，並於室溫下放置15分鐘後自玻璃板剝離，於80℃之烘箱中乾燥10分鐘，於120℃下乾燥20分鐘，獲得厚度40 μm、玻璃轉移溫度(Tg)為140℃之高分子膜。所獲得之高分子膜之波長590 nm下之透光率為93%。又，上述高分子膜之面內相位差值：Re(590)為5.0 nm，厚度方向之相位差值：Rth(590)為12.0 nm。平均折射率為1.576。 使所獲得之高分子膜於150℃之空氣循環式恆溫烘箱內單軸延伸至1.5倍而獲得相位差膜F。所獲得之相位差膜F之Re(550)為140 nm、Rth(550)為140 nm、Re(450)/Re(550)為1.06。 [化2]

(附相位差層之偏光板及液晶顯示裝置之製作) 使用上述相位差膜F代替相位差膜A，除此以外，以與實施例1相同之方式製作附相位差層之偏光板，使用該附相位差層之偏光板，除此以外，以與實施例1相同之方式製作液晶顯示裝置。使該液晶顯示裝置顯示白色圖像，並於白色圖像狀態下對通過偏光太陽眼鏡之視認性進行評價。將評價結果示於表1。 [表1]    第1相位差層 第2相位差層 背光光源 視認性 面內相位差Re550(nm) 波長分散特性(Re450/Re550) Nz係數 厚度方向相位差Rth550(nm) 光譜 (λ2－λ1)/(△λ2＋△λ1) (λ3－λ2)/(△λ3＋△λ2) {hP2－(hB2＋hB1)/2}/hP2 實施例1 140 0.89 1.0 - 非連續 1.38 1.63 0.90 良好 實施例2 140 0.89 0.5 - 非連續 1.38 1.63 0.90 良好 實施例3 140 0.89 1.0 -100 非連續 1.22 1.71 0.85 良好 實施例4 140 0.89 1.2 - 非連續 1.38 1.63 0.90 良好 比較例1 140 1.00 0.5 - 非連續 1.38 1.63 0.90 不良 比較例2 140 1.00 1.0 - 連續 0.88 0.44 0.55 不良 比較例3 140 1.06 1.0 - 非連續 1.38 1.63 0.90 不良 [產業上之可利用性] 本發明之液晶顯示裝置可較佳地用於可攜式資訊終端(PDA)、行動電話、鐘錶、數相位機、可攜式遊戲機等行動裝置、電腦監視器、筆記型電腦、影印機等辦公自動化設備、攝錄影機、液晶電視、微波爐等家用電氣設備、後部監視器、汽車導航系統用監視器、汽車音響等車載用設備、商業店鋪用資訊用監視器等展示設備、監視用監視器等警戒設備、護理用監視器、醫療用監視器等護理、醫療機器等各種用途。Hereinafter, representative embodiments of the present invention will be described, but the present invention is not limited to these embodiments. (Definition of terms and symbols) The definitions of terms and symbols in this manual are as follows. (1) Refractive index (nx, ny, nz) "Nx" refers to the refractive index in the direction in which the in-plane refractive index becomes the largest (i.e., the direction of the late axis), and "ny" refers to the refractive index in the direction orthogonal to the late axis (i.e., the direction of the advancing axis) in the plane, "Nz" is the refractive index in the thickness direction. (2) In-plane phase difference (Re) "Re(λ)" measures the in-plane retardation of the resulting film using light with a wavelength of λnm at 23°C. For example, "Re(450)" uses light with a wavelength of 450 nm at 23°C to measure the in-plane retardation of the resulting film. When the thickness of the film is d (nm), Re (λ) is obtained by the formula: Re=(nx-ny)×d. (3) Phase difference in thickness direction (Rth) "Rth(λ)" is measured using light with a wavelength of 550 nm at 23°C in the thickness direction of the film obtained. For example, "Rth(450)" uses light with a wavelength of 450 nm at 23°C to measure the retardation in the thickness direction of the resulting film. When the thickness of the film is d (nm), Rth(λ) is obtained by the formula: Rth=(nx-nz)×d. (4) Nz coefficient The Nz coefficient is obtained by Nz=Rth/Re. (5) nx=ny, nx=nz, ny=nz The so-called nx=ny includes not only the case where nx and ny are exactly the same, but also the case where nx and ny are substantially the same. The same applies to the relationship between nx=nz and ny=nz. (6) Substantially orthogonal or parallel The expressions "substantially orthogonal" and "substantially orthogonal" include the case where the angle formed by the two directions is 90°±10°, preferably 90°±7°, and more preferably 90°±5°. The expressions "substantially parallel" and "substantially parallel" include the case where the angle formed by the two directions is 0°±10°, preferably 0°±7°, and more preferably 0°±5°. Furthermore, when it is simply referred to as "orthogonal" or "parallel", it may also include a state of being substantially orthogonal or substantially parallel. (7) Angle In this specification, when referring to an angle, unless specifically stated otherwise, the angle includes the angle in both the clockwise and counterclockwise directions. A. The overall structure of the liquid crystal display device Fig. 1 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. In the drawings, in order to facilitate observation, the ratio of the thickness of each layer and each optical member is different from the actual product. The liquid crystal display device 500 of the present embodiment includes a liquid crystal panel 100, a retardation layer 200 arranged on the visible side of the liquid crystal panel 100, and a backlight light source 300 that illuminates the liquid crystal panel 100 from the back side. In the example shown in the figure, another retardation layer 400 may be further disposed between the liquid crystal panel 100 and the retardation layer 200. Depending on the purpose, configuration, required characteristics, etc., the other retardation layer may be omitted. In addition, for convenience of description, the retardation layer 200 may be referred to as a first retardation layer, and the other retardation layer 400 may be referred to as a second retardation layer. In the embodiment of the present invention, the in-plane retardation Re(550) of the first retardation layer 200 is 100 nm to 180 nm, preferably 110 nm to 170 nm, and more preferably 120 nm to 160 nm, especially Preferably, it is 135 nm to 155 nm. Furthermore, the first retardation layer 200 satisfies the relationship of Re(450)<Re(550)<Re(650). In addition, in the embodiment of the present invention, the backlight light source 300 has a non-continuous emission spectrum. The liquid crystal panel 100 includes a liquid crystal cell 10, a first polarizing element 20 arranged on the visible side of the liquid crystal cell 10, and a second polarizing element 30 arranged on the back side of the liquid crystal cell 10. The absorption axis of the first polarizing element 20 is substantially perpendicular or parallel to the long side of the liquid crystal panel 100 (liquid crystal cell 10). In addition, the absorption axis of the second polarizing element 30 is also substantially orthogonal or parallel to the long side of the liquid crystal panel 100 (liquid crystal cell 10). Furthermore, the long side of the liquid crystal panel can be either the left-right direction of the display screen or the up-down direction. The absorption axis of the first polarizing element 20 and the absorption axis of the second polarizing element 30 are substantially orthogonal. A protective film (not shown) may be disposed on one side or both sides of the first polarizing element 20. Similarly, a protective film (not shown) may be disposed on one side or both sides of the second polarizing element 30. The angle formed by the slow axis of the first retardation layer 200 and the long side of the liquid crystal panel 100 is 35°-55°, preferably 38°-52°, more preferably 40°-50°, and more preferably 42°～48°, particularly preferably 44°～46°, particularly preferably about 45°. Therefore, the angle formed by the slow axis of the first retardation layer 200 and the absorption axis of the first polarizer 20 is preferably 35° to 55°, more preferably 38° to 52°, and still more preferably 40° to 50°, particularly preferably 42°～48°, particularly preferably 44°～46°, most preferably about 45°. In one embodiment, a conductive layer (not shown) may be provided between the first polarizing element 20 and the liquid crystal cell 10. By providing such a conductive layer, the liquid crystal display device can function as a so-called built-in touch panel type input display device in which a touch sensor is integrated between the display unit (liquid crystal unit) and the polarizing element. Optionally, any appropriate optical compensation layer (another retardation layer) may be disposed between the first polarizing element 20 and the liquid crystal cell 10 and/or between the second polarizing element 30 and the liquid crystal cell 10 as needed. The arrangement number, combination, arrangement position, arrangement sequence, optical characteristics (such as refractive index ellipsoid, in-plane retardation, thickness direction retardation, Nz coefficient), mechanical characteristics of such optical compensation layers can be based on the purpose, and the liquid crystal display device The composition and required characteristics are appropriately set. Hereinafter, the constituent elements (optical film, optical member) of the liquid crystal display device will be described. B. LCD panel B-1. Liquid crystal cell The liquid crystal cell 10 has a pair of substrates 11 and 12, and a liquid crystal layer 13 as a display medium sandwiched between the substrates. In a general configuration, a color filter and a black matrix are provided on one substrate 11, and a switching element for controlling the electro-optical characteristics of liquid crystal is provided on the other substrate 12, a scanning line for providing gate signals to the switching element, and providing Source signal signal line, pixel electrode and counter electrode. The interval (cell gap) between the above-mentioned substrates 11 and 12 can be controlled by a spacer or the like. For example, an alignment film containing polyimide or the like may be provided on the side of the substrates 11 and 12 that is in contact with the liquid crystal layer 13. In one embodiment, the liquid crystal layer 13 includes liquid crystal molecules that are aligned along the plane in the absence of an electric field. Typically, the refractive index ellipsoid of such a liquid crystal layer (the result is a liquid crystal cell) shows a relationship of nx>ny=nz. As a representative example of a driving mode using such a liquid crystal layer exhibiting a three-dimensional refractive index, a lateral electric field effect (IPS) mode, a fringe field switching (FFS) mode, etc. can be cited. The IPS mode includes Super·In plane switching (S-IPS) mode or Advanced·Super·In plane switching (AS-IPS) mode using V-shaped electrodes or zigzag electrodes. The FFS mode includes Advanced·Fringe-Field Switching (A-FFS) mode or Ultra Fringe-Field Switching (U-FFS) mode using V-shaped electrodes or zigzag electrodes. In the driving mode (such as IPS mode, FFS mode) of liquid crystal molecules aligned along the surface in the absence of an electric field, there is no tilt inversion, and the tilt viewing angle is wide, so it can be viewed from the tilt direction The advantage of the excellent visibility of Time. In another embodiment, the liquid crystal layer 13 includes liquid crystal molecules that are aligned in a vertical arrangement in the absence of an electric field. As a driving mode used for liquid crystal molecules aligned in a vertical arrangement in the absence of an electric field, for example, a vertical alignment (VA) mode can be cited. The VA mode includes the multi-domain VA (MVA) mode. In the driving mode (such as VA mode) that uses liquid crystal molecules aligned vertically in the absence of an electric field, since the transmissivity of the halftone in the oblique direction is higher than the transmissivity of the halftone in the front direction, it has self-contained The halftones viewed obliquely have the advantage of being brighter and less black. B-2. Polarizing element As the first polarizing element 20 and the second polarizing element 30, any appropriate polarizing element can be used. The material, thickness, optical characteristics, etc. of the first polarizing element 20 and the second polarizing element 30 may be the same or different. Hereinafter, the first polarizing element 20 and the second polarizing element 30 may be collectively referred to as a polarizing element. The resin film forming the polarizing element may be a single-layer resin film or a laminate of two or more layers. Specific examples of polarizing elements composed of a single-layer resin film include polyvinyl alcohol (PVA)-based films, partially formalized PVA-based films, ethylene-vinyl acetate copolymer-based partially saponified films, etc., which are highly hydrophilic. The molecular film is formed by dyeing and stretching using dichroic substances such as iodine or dichroic dyes, and polyene-based alignment films such as dehydrated PVA or dehydrated polyvinyl chloride. In terms of excellent optical characteristics, it is preferable to use a polarizing element obtained by dyeing a PVA-based film with iodine and uniaxially stretching it. The dyeing by the above-mentioned iodine can be performed by immersing the PVA-based film in an iodine aqueous solution, for example. The stretching magnification of the above-mentioned uniaxial stretching is preferably 3 to 7 times. Stretching can be done after dyeing, or it can be stretched while dyeing. Also, dyeing may be performed after stretching. The PVA-based film may be subjected to swelling treatment, cross-linking treatment, washing treatment, drying treatment, etc. as needed. For example, by immersing the PVA-based film in water for washing before dyeing, not only the stains or anti-caking agent on the surface of the PVA-based film can be washed away, but also the PVA-based film can be swollen to prevent uneven dyeing. As a specific example of a polarizing element obtained by using a laminate, a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a coating formed on the resin substrate A polarizing element obtained by a laminate of PVA-based resin layers of the resin base material. A polarizing element obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to the resin substrate and drying it. A PVA-based resin layer is formed on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; the laminate is extended and dyed to use the PVA-based resin layer as a polarizing element. In this embodiment, the stretching typically includes stretching after immersing the laminate in an aqueous boric acid solution. Furthermore, stretching may further include performing aerial stretching of the laminate at a high temperature (for example, 95° C. or higher) before stretching in an aqueous boric acid solution as necessary. The obtained resin substrate/polarizing element laminate can be used directly (that is, the resin substrate can also be used as a protective layer for the polarizing element), or the resin substrate can be peeled from the resin substrate/polarizing element laminate. And use it after peeling off any suitable protective layer corresponding to the purpose of the area layer. The details of the manufacturing method of such a polarizing element are described in, for example, Japanese Patent Laid-Open No. 2012-73580. Regarding this gazette, the entire description is cited in this specification as a reference. The thickness of the polarizing element is preferably 15 μm or less, more preferably 1 μm-12 μm, still more preferably 3 μm-10 μm, and particularly preferably 3 μm-8 μm. If the thickness of the polarizing element is in this range, curling during heating can be well suppressed and good appearance durability during heating can be obtained. Furthermore, if the thickness of the polarizing element is in this range, it can contribute to the thinning of the liquid crystal display device. The polarizing element preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm. The monomer transmittance of the polarizing element is preferably 43.0%-46.0%, more preferably 44.5%-46.0%. The degree of polarization of the polarizing element is preferably 97.0% or more, more preferably 99.0% or more, and still more preferably 99.9% or more. As described above, a protective film may be disposed on one side or both sides of the first polarizing element 20, and a protective film may be disposed on one side or both sides of the second polarizing element 30. That is, the polarizing element may be used as a constituent element of the liquid crystal display device alone, or the form of a polarizing plate including the polarizing element and a protective film may be used as the constituent element of the liquid crystal display device. Furthermore, the polarizing element and the protective film may be laminated separately (that is, the polarizing element and the protective film are separated) as a constituent element of the liquid crystal display device. The protective film is formed of any suitable film. Specific examples of the material that becomes the main component of the film include: cellulose resins such as triacetyl cellulose (TAC) or polyester, polyvinyl alcohol, polycarbonate, polyamide, polyamide, etc. Transparent resins such as imine, polyether ether, polystyrene, polystyrene, polynorene, polyolefin, (meth)acrylic, acetate, etc. In addition, thermosetting resins such as (meth)acrylic, urethane, (meth)acrylate urethane, epoxy, silicone, etc., or UV-curable resins can also be cited Resin etc. In addition, for example, glassy polymers such as silicone polymers can also be cited. In addition, the polymer film described in Japanese Patent Laid-Open No. 2001-343529 (WO01/37007) can also be used. As the material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted amide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain can be used For example, a resin composition having an alternating copolymer containing isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer can be cited. The polymer film may be, for example, an extrusion molded product of the above-mentioned resin composition. The thickness of the protective film is preferably 20 μm to 200 μm, more preferably 30 μm to 100 μm, and still more preferably 35 μm to 95 μm. When a protective film (inner protective film) is disposed on the liquid crystal cell 10 side of the first polarizing element 20 and/or the second polarizing element 30, the inner protective film is preferably optically isotropic. In this specification, "optical isotropy" means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is -10 nm to +10 nm. C. The first retardation layer As described above, the in-plane retardation Re(550) of the first retardation layer 200 is 100 nm to 180 nm, preferably 110 nm to 170 nm, more preferably 120 nm to 160 nm, and particularly preferably 135 nm ~155 nm. That is, the first retardation layer can function as a so-called λ/4 plate. Therefore, the first retardation layer has a function of converting the linearly polarized light emitted from the polarizing element to the visible side into elliptical polarized light or circularly polarized light. In this way, by arranging the first retardation layer that can function as a λ/4 plate in a specific axial relationship as described above on the viewing side of the viewing side polarizing element (first polarizing element 20), When viewing the display screen through an optical member with a polarizing effect (such as polarized sunglasses), excellent visibility can also be achieved. Therefore, the liquid crystal display device of the present invention can be preferably used outdoors. Furthermore, as described above, the first retardation layer satisfies the relationship of Re(450)<Re(550)<Re(650). That is, the first retardation layer shows the wavelength dependence of the inverse dispersion whose retardation value increases in accordance with the wavelength of the measurement light. The Re(450)/Re(550) of the first retardation layer is preferably 0.8 or more and less than 1.0, more preferably 0.8 to 0.95. Re(550)/Re(650) is preferably 0.8 or more and less than 1.0, more preferably 0.8 to 0.97. Typically, the refractive index characteristic of the first retardation layer shows a relationship of nx>ny and has a slow axis. As described above, the angle formed by the slow axis of the first retardation layer 200 and the absorption axis of the first polarizing element 20 is preferably 35° to 55°, more preferably 38° to 52°, and still more preferably 40 °～50°, particularly preferably 42°～48°, particularly preferably 44°～46°, most preferably about 45°. If the angle is in this range, by setting the first retardation layer as a λ/4 plate and arranging the first retardation layer on the viewing side more than the first polarizing element (viewing side polarizing element), even Excellent visibility can also be achieved when viewing the display screen through an optical member with a polarizing effect (such as polarized sunglasses). Therefore, the liquid crystal display device of the present invention can also be preferably used outdoors. As long as the first retardation layer has a relationship of nx>ny, any appropriate refractive index ellipsoid will be shown. Preferably, the refractive index ellipsoid of the first retardation layer shows a relationship of nx>nz>ny. The Nz coefficient of the first retardation layer is preferably 0.2 to 0.8, more preferably 0.3 to 0.7, still more preferably 0.4 to 0.6, and particularly preferably about 0.5. By satisfying this relationship, there is an advantage of suppressing coloration when viewed from an oblique direction through an optical member having a polarizing effect (for example, polarized sunglasses). The absolute value of the first retardation layer including the photoelastic coefficient is preferably 2×10^-11 m² /N or less, preferably 2.0×10^-13 m² /N～1.5×10^-11 m² /N, more preferably 1.0×10^-12 m² /N～1.2×10^-11 m² /N of resin. If the absolute value of the photoelastic coefficient is in this range, the phase difference will not change easily when the shrinkage stress during heating occurs. As a result, heat unevenness in the liquid crystal display device can be prevented favorably. The thickness of the first retardation layer can be set in such a way that the λ/4 plate functions optimally. In other words, the thickness can be set in such a way that the required in-plane phase difference can be obtained. Specifically, the thickness is preferably 1 μm to 80 μm, more preferably 10 μm to 80 μm, still more preferably 10 μm to 60 μm, and particularly preferably 30 μm to 50 μm. The first retardation layer is formed of any appropriate resin that can satisfy the above-mentioned characteristics. Examples of the resin forming the first retardation layer include polycarbonate resins, polyvinyl acetal resins, cycloolefin resins, acrylic resins, and cellulose ester resins. Preferably it is a polycarbonate resin. As the above-mentioned polycarbonate resin, any appropriate polycarbonate resin can be used as long as the effects of the present invention can be obtained. Preferably, the polycarbonate resin contains a structural unit derived from a stilbene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from alicyclic diol, alicyclic dimethanol, two The structural unit of at least one dihydroxy compound in the group consisting of, tri- or polyethylene glycol, and alkylene glycol or spirodiol. Preferably, the polycarbonate resin contains a structural unit derived from a stilbene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from alicyclic dimethanol, and/or a structural unit derived from two, three Or a structural unit of polyethylene glycol; more preferably, it contains a structural unit derived from a stilbene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from di-, tri-, or polyethylene glycol Structural units. The polycarbonate resin may optionally contain other structural units derived from dihydroxy compounds. Furthermore, the details of the polycarbonate resin that can be preferably used in the present invention are described in, for example, Japanese Patent Laid-Open No. 2014-10291 and Japanese Patent Laid-Open No. 2014-26266, and the description is incorporated by reference. In this manual. The glass transition temperature of the polycarbonate resin is preferably 110°C or higher and 250°C or lower, more preferably 120°C or higher and 230°C or lower. If the glass transition temperature is too low, the heat resistance tends to be deteriorated, which may cause dimensional changes after the film is formed, and may also reduce the image quality of the obtained liquid crystal display device. If the glass transition temperature is too high, the forming stability during film forming may deteriorate, and the transparency of the film may be impaired. In addition, the glass transition temperature is determined based on JIS K 7121 (1987). The molecular weight of the above polycarbonate resin can be represented by reduced viscosity. The reduced viscosity is measured by using dichloromethane as the solvent to accurately prepare the polycarbonate concentration to 0.6 g/dL and using a Ubbelohde viscosity tube at a temperature of 20.0°C±0.1°C. The lower limit of the reduction viscosity is usually preferably 0.30 dL/g, more preferably 0.35 dL/g or more. The upper limit of the reduction viscosity is generally preferably 1.20 dL/g, more preferably 1.00 dL/g, and still more preferably 0.80 dL/g. If the reduction viscosity is less than the above lower limit, there may be a problem that the mechanical strength of the molded product decreases. On the other hand, if the reduction viscosity is greater than the above upper limit, there may be a problem of reduced fluidity during molding, and reduced productivity or moldability. The retardation film constituting the first retardation layer can be obtained by, for example, stretching a film formed of the above-mentioned polycarbonate resin. As a method of forming a film from a polycarbonate-based resin, any appropriate forming method can be adopted. Specific examples include: compression molding method, transfer molding method, injection molding method, extrusion molding method, blow molding method, powder molding method, FRP (Fiber Reinforced Plastics, fiber reinforced plastic) molding method, casting coating method (For example, casting method), calender forming method, hot pressing method, etc. Preferably, it is an extrusion molding method or a cast coating method. The reason is that the smoothness of the obtained film can be improved, so that good optical uniformity can be obtained. The molding conditions can be appropriately set according to the composition or type of the resin used, the required characteristics of the retardation film, and the like. The thickness of the resin film (unstretched film) can be set to any appropriate value according to the required thickness of the obtained retardation film, the required optical properties, the following stretching conditions, and the like. Preferably, it is 50 μm to 300 μm. Any appropriate stretching method and stretching conditions (e.g. stretching temperature, stretching magnification, stretching direction) can be used for the above-mentioned stretching. Specifically, various extension methods such as free end extension, fixed end extension, free end contraction, and fixed end contraction can be used individually, or simultaneously or successively. Regarding the extension direction, it may be performed in various directions or dimensions such as the length direction, the width direction, the thickness direction, and the oblique direction. By appropriately selecting the above-mentioned stretching method and stretching conditions, a retardation film having the above-mentioned required optical characteristics (for example, refractive index characteristics, in-plane retardation, and Nz coefficient) can be obtained. In one embodiment, the retardation film is produced by uniaxially extending a resin film or uniaxially extending a fixed end. As a specific example of uniaxial extension of the fixed end, a method of moving the resin film in the longitudinal direction on one side and extending in the width direction (lateral direction) on the other side can be cited. The stretching ratio is preferably 1.1 to 3.5 times. In another embodiment, the retardation film can be produced by continuously extending a long resin film obliquely in a direction at a specific angle with respect to the longitudinal direction. By adopting oblique stretching, it is possible to obtain a long stretched film with a specific angle of alignment (having a late phase axis in the direction of a specific angle) with respect to the longitudinal direction of the film. For example, it can be rolled when laminated with a polarizing element. The rollers can simplify the manufacturing steps. Furthermore, the above-mentioned specific angle may be the angle formed by the absorption axis of the first polarizing element and the slow axis of the first retardation layer in the liquid crystal display device. As mentioned above, the angle is preferably 35°-55°, more preferably 38°-52°, still more preferably 40°-50°, particularly preferably 42°-48°, particularly preferably 44°-46 °, the best is about 45 °. As the stretching machine used for oblique stretching, for example, a tenter-type stretching machine that can impart conveying force or stretching force or extracting force at different speeds in the lateral direction and/or longitudinal direction can be exemplified. Tenter-type stretching machines include horizontal uniaxial stretching machines, synchronous biaxial stretching machines, etc. Any suitable stretching machine can be used as long as the long resin film can be stretched continuously and obliquely. In the above stretching machine, by appropriately controlling the left and right speeds, respectively, a retardation film having the required in-plane retardation and a slow axis in the required direction (substantially a long strip) can be obtained. The retardation film). As the method of oblique extension, for example, Japanese Patent Laid-Open No. 50-83482, Japanese Patent Laid-Open No. 2-113920, Japanese Patent Laid-Open No. 3-182701, Japanese Patent Laid-Open No. 2000-9912, Methods described in Japanese Patent Laid-Open No. 2002-86554 and Japanese Patent Laid-Open No. 2002-22944. The retardation film that can be preferably used in the embodiment of the present invention (that is, the retardation film with an Nz coefficient of less than 1.0) can be bonded to one side or both sides of the resin film by using, for example, an acrylic adhesive. Then, a laminated body is formed, and the laminated body is subjected to the above-mentioned stretching to be produced. By adjusting the structure of the heat shrinkable film (for example, shrinking force) and stretching conditions (for example, stretching temperature), a retardation film with the required Nz coefficient can be obtained. The stretching temperature of the above-mentioned film can be changed according to the required in-plane retardation value and thickness of the retardation film, the type of resin used, the thickness of the film used, the stretching ratio, etc. Specifically, the stretching temperature is preferably Tg-30°C to Tg+30°C, more preferably Tg-15°C to Tg+15°C, and most preferably Tg-10°C to Tg+10°C. By stretching at such a temperature, a retardation film with appropriate characteristics can be obtained in the present invention. Furthermore, Tg is the glass transition temperature of the constituent material of the film. A commercially available film can also be used as the polycarbonate resin film. As specific examples of commercially available products, we can cite: the product names "PURE-ACEWR-S", "PURE-ACEWR-W", "PURE-ACEWR-M" manufactured by Teijin, and the product names "NRF" manufactured by Nitto Denko ". The commercially available film can be used directly, or the commercially available film can be used after secondary processing (such as elongation treatment, surface treatment) according to the purpose. D. Backlight The backlight light source 300 is included in a backlight unit (not shown). In addition to the light source, the backlight unit typically includes a light guide plate, a diffuser sheet, and a scallop sheet. As mentioned above, the backlight light source has a non-continuous emission spectrum. The so-called "having a non-continuous emission spectrum" means that there are clear peaks in the respective wavelength regions of red (R), green (G), and blue (B) and the respective peaks are clearly distinguished. Fig. 2 is a diagram schematically showing an example of a discontinuous emission spectrum. As shown in FIG. 2, the emission spectrum of the backlight light source has a peak P1 in the wavelength region (blue wavelength region) preferably from 430 nm to 470 nm, more preferably from 440 nm to 460 nm, and preferably from 530 nm to 530 nm. The wavelength region of 570 nm, more preferably 540 nm to 560 nm (wavelength region of green) has a peak P2, and the wavelength region of preferably 630 nm to 670 nm, more preferably 640 nm to 660 nm (wavelength of red) Area) has a peak P3. Preferably, the wavelength λ1 of the peak P1, the height hP1 and the half-value width Δλ1, the wavelength λ2 of the peak P2, the height hP2 and the half-value width Δλ2, the wavelength λ3 of the peak P3, the height hP3 and the half-value width Δλ3, the peak P1 and the peak P2 The height of the trough between hB1 and the height of the trough hB2 between the crest P2 and the crest P3 satisfy the following relations (1) to (3): (λ2－λ1)/(Δλ2＋Δλ1)＞1・・・(1) (λ3－λ2)/(Δλ3＋Δλ2)＞1・・・(2) 0.8≦{hP2－(hB2＋hB1)/2}/hP2≦1・・・(3). (Λ2-λ1)/(Δλ2+Δλ1) in formula (1) is more preferably 1.01 to 2.00, and still more preferably 1.10 to 1.50. (Λ3-λ2)/(Δλ3+Δλ2) in the formula (2) is more preferably 1.01 to 2.00, and still more preferably 1.10 to 1.50. {HP2-(hB2+hB1)/2} of formula (3) is more preferably 0.85-1, and still more preferably 0.9-1. Equation (1) means that the relationship between blue light and green light is independent as a light source without color mixing. The formula (2) means that the relationship between green light and red light is independent as a light source without mixing colors. The formula (3) means that the bottom of the valley between the peaks P1, P2, and P3 is low and the peaks of blue light, green light, and red light are clearly distinguished. By defining formulas (1) to (3), there is an advantage of improved color reproducibility. The synergistic effect of the backlight light source 300 that satisfies the emission spectrum of the formula (1) to the formula (3) and the first retardation layer 200 can achieve excellent color reproducibility and visual recognition by optical members with polarizing effects. A liquid crystal display device with excellent performance and suppressed color unevenness. For example, compared with the previous backlight light source (a white light source combining only red, green, and blue LEDs) with the emission spectrum shown in FIG. 3, the color reproducibility can be achieved through the use of polarized light. The visibility and color unevenness of the functional optical components are all significantly improved. The backlight light source has any suitable configuration that can realize the above-mentioned emission spectrum. In one embodiment, the backlight light source includes a red emitting LED, a green emitting LED, and a blue emitting LED, and the fluorescent system of the red emitting LED is activated by tetravalent manganese ions. By activating the phosphor of the red emitting LED, the overlap of the red light and the green light in the emission spectrum shown in FIG. 3 can be reduced, so that the emission spectrum shown in FIG. 2 can be realized. As a preferred specific example of this red phosphor activated by tetravalent manganese ions, one can cite William M. Yen and Marvin J. Weber's "INORGANIC PHOSPHORS" p.212 (SECTION 4: PHOSPHOR DATA 4.10 Miscellaneous) published by CRC. Oxides) exemplified by Mn^{4 +} Activated Mg fluorogermanate phosphor (2.5MgO・MgF₂ : Mn^{4 +} ) And the Journal of the Electrochemical Society: SOLID-STATE SCIENCE AND TECHNOLOGY, July 1973, p942 exemplified M¹ ₂ M² F₆ : Mn^{4 +} (M¹ =Li, Na, K, Rb, Cs; M² =Si, Ge, Sn, Ti, Zr) phosphors. A backlight light source using such a red phosphor is described in, for example, Japanese Patent Laid-Open No. 2015-52648. In addition, a backlight light source having a general configuration including red-emitting LEDs, green-emitting LEDs, and blue-emitting LEDs is described in, for example, Japanese Patent Laid-Open No. 2012-256014. The records in these bulletins are cited in this specification as a reference. In another embodiment, the backlight light source includes a blue-emitting LED and a wavelength conversion layer including quantum dots. With this configuration, part of the blue light emitted from the LED is converted into red light and green light by the wavelength conversion layer, and the other part of the blue light is directly emitted in the form of blue light. As a result, white light can be realized. Furthermore, by appropriately configuring the wavelength conversion layer, it is possible to realize a light emission spectrum with clear peaks of red light, green light, and blue light and a small overlap of each color light (emission spectrum as shown in FIG. 2). Typically, the wavelength conversion layer includes a matrix and quantum dots dispersed in the matrix. As the material constituting the matrix (hereinafter also referred to as matrix material), any appropriate material can be used. Examples of such materials include resins, organic oxides, and inorganic oxides. The matrix material preferably has low oxygen permeability and moisture permeability, high light stability and chemical stability, has a specific refractive index, has excellent transparency, and/or has excellent dispersibility for quantum dots . Taking these into consideration comprehensively, the matrix material is preferably a resin. The resin may be a thermoplastic resin, a thermosetting resin, or an active energy ray-curing resin (for example, electron beam curing resin, ultraviolet curing resin, visible light curing resin). Preferably it is a thermosetting resin or an ultraviolet curable resin, More preferably, it is a thermosetting resin. The resin can be used alone or in combination (for example, blending, copolymerization). Quantum dots can control the wavelength conversion characteristics of the wavelength conversion layer. Specifically, by appropriately combining quantum dots with different emission center wavelengths, a wavelength conversion layer that realizes light with a desired emission center wavelength can be formed. The emission center wavelength of quantum dots can be adjusted by the material and/or composition of the quantum dots, particle size, shape, etc. As quantum dots, for example, there are known quantum dots having a center wavelength of emission in the wavelength band of 600 nm to 680 nm (hereinafter referred to as quantum dot A), and emitting light in the wavelength band of 500 nm to 600 nm. A quantum dot with a central wavelength (hereinafter referred to as quantum dot B), a quantum dot with a central wavelength of emission in the wavelength band of 400 nm to 500 nm (hereinafter referred to as quantum dot C). The quantum dot A is excited by the excitation light (light from the backlight source in the present invention) to emit red light, the quantum dot B emits green light, and the quantum dot C emits blue light. By appropriately combining these, and when light of a specific wavelength (light from a backlight light source) is incident and passed through the wavelength conversion layer, light with a luminous center wavelength in the required wavelength band can be realized. The quantum dots can be made of any suitable material. The quantum dots can be composed of preferably inorganic materials, more preferably inorganic conductive materials or inorganic semiconductor materials. As the semiconductor material, for example, semiconductors of Group II-VI, Group III-V, Group IV-VI, and Group IV can be cited. Specific examples include Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdSeZn, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si₃ N₄ , Ge₃ N₄ , Al₂ O₃ , (Al, Ga, In)₂ (S, Se, Te)₃ , Al₂ CO. These can be used individually or in combination of 2 or more types. The quantum dots may also contain p-type dopants or n-type dopants. The size of the quantum dot can be any appropriate size according to the required emission wavelength. The size of the quantum dot is preferably 1 nm to 10 nm, more preferably 2 nm to 8 nm. If the size of the quantum dot is in this range, green and red respectively show bright light emission, so that high color rendering can be achieved. For example, green light can emit light at a quantum dot size of about 7 nm, and red light can emit light at about 3 nm. Regarding the size of the quantum dot, when the quantum dot is, for example, a true spherical shape, it is the average particle diameter, and in the case of other shapes, it is the size along the smallest axis of the shape. Furthermore, as the shape of the quantum dot, any appropriate shape can be adopted according to the purpose. Specific examples include a true spherical shape, a scaly shape, a plate shape, an elliptical spherical shape, and an irregular shape. The quantum dots can be formulated in a ratio of preferably 1 part by weight to 50 parts by weight, more preferably 2 parts by weight to 30 parts by weight relative to 100 parts by weight of the host material. If the deployment amount of quantum dots is in this range, a liquid crystal display device with excellent balance of all RGB hues can be realized. The details of quantum dots are described in, for example, Japanese Patent Publication No. 2012-169271, Japanese Patent Publication No. 2015-102857, Japanese Patent Publication No. 2015-65158, Japanese Patent Publication No. 2013-544018, Japanese Patent Japanese Patent Application Publication No. 2013-544018 and Japanese Patent Application Publication No. 2010-533976, and the descriptions in these publications are incorporated into this specification by reference. Commercially available quantum dots can also be used. The thickness of the wavelength conversion layer is preferably 1 μm to 500 μm, more preferably 100 μm to 400 μm. If the thickness of the wavelength conversion layer is in this range, the conversion efficiency and durability can be excellent. The wavelength conversion layer in the backlight unit is arranged on the emitting side of the LED (light source) in the form of a film. E. Second retardation layer As described above, the refractive index characteristic of the second retardation layer 400 shows the relationship of nz>nx≧ny. The thickness direction retardation Rth(550) of the second retardation layer is preferably -260 nm to -10 nm, more preferably -230 nm to -15 nm, and still more preferably -215 nm to -20 nm. By providing a second retardation layer with such optical characteristics, the color when viewed from an oblique direction through an optical member having a polarizing effect (such as polarized sunglasses) is significantly improved. As a result, very excellent viewing angle characteristics can be obtained. The liquid crystal display device. In one embodiment, the refractive index of the second retardation layer shows a relationship of nx=ny. In another embodiment, the refractive index of the second retardation layer shows a relationship of nx>ny. Therefore, there are cases where the second retardation layer has a slow axis. In this case, the slow axis of the second retardation layer is substantially perpendicular or parallel to the absorption axis of the first polarizing element 20. In addition, the in-plane retardation Re(550) of the second retardation layer is preferably 10 nm to 150 nm, more preferably 10 nm to 80 nm. The second retardation layer can be formed of any appropriate material. Preferably, it is a liquid crystal layer fixed in a vertical alignment. The liquid crystal material (liquid crystal compound) capable of vertical alignment can be either a liquid crystal monomer or a liquid crystal polymer. As specific examples of the liquid crystal compound and the method of forming the liquid crystal layer, the liquid crystal compound and the method of forming described in [0020] to [0042] of JP 2002-333642 A can be cited. In this case, the thickness is preferably 0.1 μm to 5 μm, more preferably 0.2 μm to 3 μm. As another preferable specific example, the second retardation layer may be a retardation film formed of a fumarate diester resin described in JP 2012-32784 A. In this case, the thickness is preferably 5 μm to 80 μm, more preferably 10 μm to 50 μm. F. Conductive layer Typically, the conductive layer (not shown) is transparent (that is, the conductive layer is a transparent conductive layer). Since a conductive layer is formed between the first polarizing element 20 and the liquid crystal cell 10, the liquid crystal display device can function as a so-called built-in touch panel type input display device. The conductive layer can be used alone as a constituent layer of the liquid crystal display device, or it can be provided to the liquid crystal display device in the form of a laminate with a substrate (conductive layer with a substrate). In the case of a conductive layer alone, the conductive layer can be transferred from the substrate on which the conductive layer is formed to a specific position of the liquid crystal display device. The conductive layer may be patterned as needed. By patterning, the conductive portion and the insulating portion can be formed. As a result, electrodes can be formed. The electrode can function as a touch sensor electrode that senses contact with the touch panel. The shape of the pattern is preferably a pattern that functions well as a touch panel (for example, an electrostatic capacitance type touch panel). Specific examples include Japanese Patent Publication No. 2011-511357, Japanese Patent Application Publication No. 2010-164938, Japanese Patent Application Publication No. 2008-310550, Japanese Patent Application Publication No. 2003-511799, and Japanese Patent Application Publication. The pattern described in the 2010-541109 Bulletin. The total light transmittance of the conductive layer is preferably 80% or more, more preferably 85% or more, and still more preferably 90% or more. For example, if the following conductive nanowires are used, a transparent conductive layer with openings can be formed, and a transparent conductive layer with high light transmittance can be obtained. The density of the conductive layer is preferably 1.0 g/cm³ ～10.5 g/cm³ , More preferably 1.3 g/cm³ ～3.0 g/cm³ . The surface resistance of the conductive layer is preferably 0.1 Ω/□～1000 Ω/□, more preferably 0.5 Ω/□～500 Ω/□, and still more preferably 1 Ω/□～250 Ω/□. Representative examples of the conductive layer include a conductive layer containing a metal oxide, a conductive layer containing a conductive nanowire, and a conductive layer containing a metal mesh. Preferably, it is a conductive layer containing conductive nanowires or a conductive layer containing metal mesh. The reason is that it is excellent in bending resistance, even if it is bent, the conductivity is not easy to disappear, so it can form a conductive layer that can be bent well. As a result, the liquid crystal display device can be configured to be flexible. The conductive layer containing metal oxide can be formed by any suitable film forming method (such as vacuum evaporation, sputtering, CVD (Chemical Vapor Deposition, chemical vapor deposition) method, ion plating method, spray method, etc.) A metal oxide film is formed on any suitable substrate. Examples of metal oxides include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide. Among them, indium-tin composite oxide (ITO) is preferred. The conductive layer containing conductive nanowires can be coated on any suitable substrate by applying a dispersion of conductive nanowires in a solvent (conductive nanowire dispersion) to make the coating layer Dry and form. As the conductive nanowire, any appropriate conductive nanowire can be used as long as the effects of the present invention can be obtained. The so-called conductive nanowire refers to a conductive material with a needle-like or thread-like shape and a nanometer-sized diameter. Conductive nanowires can be linear or curved. As described above, the conductive layer containing conductive nanowires has excellent bending resistance. In addition, the conductive layer containing conductive nanowires is formed into a grid by forming gaps between the conductive nanowires. Even a small amount of conductive nanowires can form a good conductive path and obtain resistance. Smaller conductive layer. Furthermore, by making the conductive nanowires into a grid shape, openings can be formed in the gaps of the grids to obtain a conductive layer with high light transmittance. Examples of conductive nanowires include metal nanowires made of metal, conductive nanowires containing carbon nanotubes, and the like. The ratio of the thickness d of the conductive nanowire to the length L (aspect ratio: L/d) is preferably 10 to 100,000, more preferably 50 to 100,000, and still more preferably 100 to 10,000. If a conductive nanowire with a size such as this large is used, the conductive nanowires cross well and the conductivity can be higher than that of a small amount of conductive nanowires. As a result, a conductive layer with high light transmittance can be obtained. Furthermore, in this specification, the "thickness of the conductive nanowire" means the diameter when the cross-section of the conductive nanowire is round, and when it is elliptical, it means The short diameter, in the case of a polygon, means the longest diagonal. The thickness and length of the conductive nanowires can be confirmed with a scanning electron microscope or a transmission electron microscope. The thickness of the conductive nanowire is preferably less than 500 nm, more preferably less than 200 nm, still more preferably 1 nm to 100 nm, and particularly preferably 1 nm to 50 nm. If it is in this range, a conductive layer with high light transmittance can be formed. The length of the conductive nanowire is preferably 2.5 μm to 1000 μm, more preferably 10 μm to 500 μm, and still more preferably 20 μm to 100 μm. If it is in this range, a conductive layer with higher conductivity can be obtained. As the metal constituting the conductive nanowire (metal nanowire), any suitable metal can be used as long as it is a metal with relatively high conductivity. The metal nanowire is preferably composed of one or more metals selected from the group consisting of gold, platinum, silver, and copper. Among them, from the viewpoint of conductivity, silver, copper, or gold is preferred, and silver is more preferred. In addition, a material obtained by plating the above-mentioned metal (for example, gold plating) can also be used. As the carbon nanotube, any appropriate carbon nanotube can be used. For example, so-called multi-layer carbon nanotubes, two-layer carbon nanotubes, single-layer carbon nanotubes, etc. can be used. Among them, in terms of higher conductivity, single-layer carbon nanotubes can be preferably used. As the metal mesh, any appropriate metal mesh can be used as long as the effects of the present invention can be obtained. For example, the pattern of the metal wiring layer provided on the film base material can be formed into a mesh shape. The details of the conductive nanowire and the metal mesh are described in, for example, Japanese Patent Application Publication No. 2014-113705 and Japanese Patent Application Publication No. 2014-219667. The description of this gazette is cited in this specification as a reference. The thickness of the conductive layer is preferably 0.01 μm to 10 μm, more preferably 0.05 μm to 3 μm, and still more preferably 0.1 μm to 1 μm. If it is in this range, a conductive layer excellent in conductivity and light transmittance can be obtained. Furthermore, when the conductive layer contains a metal oxide, the thickness of the conductive layer is preferably 0.01 μm to 0.05 μm. G. Adhesive layer or adhesive layer Regarding the build-up of each layer and optical member constituting the liquid crystal display device of the present invention, any suitable adhesive layer or adhesive layer can be used. Typically, the adhesive layer is formed of an acrylic adhesive. Typically, the adhesive layer is formed of a polyvinyl alcohol-based adhesive. [Example] Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. In addition, the measuring method of each characteristic is as follows. In addition, as long as it is not specifically described, the "parts" and "%" in the examples are based on weight. (1) Thickness A dial gauge (manufactured by PEACOCK, product name "DG-205", dial gauge holder (product name "pds-2")) was used for measurement. (2) Phase difference A 50 mm×50 mm sample was cut from each retardation film and liquid crystal cured layer as a measurement sample, and the measurement was performed using Axoscan manufactured by Axometrics. The measurement wavelength is 450 nm and 550 nm, and the measurement temperature is 23°C. In addition, the average refractive index was measured using an Abbe refractometer manufactured by Atago, and the refractive indexes nx, ny, and nz were calculated based on the obtained retardation value. (3) Water absorption It is measured in accordance with the "Test Method for Water Absorption and Boiling Water Absorption of Plastics" described in JIS K 7209. The size of the test piece is a square with a side length of 50 mm, which is determined by immersing the test piece in water at 25°C for 24 hours and measuring the weight change before and after the immersion. the unit is%. (4) Backlight spectrum measurement The liquid crystal display device obtained in each example and each comparative example was allowed to display a white image, and the emission spectrum was measured using SR-UL1R manufactured by Topcon Corporation. Based on the wavelength λ1, wavelength λ2, wavelength λ3, height hP1, height hP2, height hP3, height hB1, height hB2, half-value width Δλ1, half-value width Δλ2, and half-value width shown in Fig. 2 related to the obtained luminescence spectrum The value width Δλ3 is calculated by the following formulas (4), (5), and (6). Furthermore, the spectrum of the display light when the liquid crystal display device displays a white image is approximately equal to the emission spectrum of the backlight light source, so the spectrum of the display light when the white image is displayed is set as the emission spectrum of the backlight light source. (λ2－λ1)/(Δλ2＋Δλ1)・・・(4) (λ3－λ2)/(Δλ3＋Δλ2)・・・(5) {hP2－(hB2＋hB1)/2}/hP2・・・(6) (5) Visibility evaluation The liquid crystal display devices obtained in each Example and each Comparative Example were allowed to display a white image, and the visibility when the image was observed through polarized sunglasses was evaluated based on the following criteria. Good・・・No coloring and uneven rainbow Defect...coloring occurs <Example 1> (Production of retardation film A constituting the first retardation layer) The polymerization was carried out using a batch polymerization device including two vertical reactors equipped with stirring blades and a reflux condenser controlled at 100°C. Combine 9,9-[4-(2-hydroxyethoxy)phenyl] 茀 (BHEPF), isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC), and magnesium acetate The tetrahydrate becomes BHEPF/ISB/DEG/DPC/magnesium acetate in molar ratio = 0.348/0.490/0.162/ 1.005/1.00×10^-5 The way to add. After the inside of the reactor is sufficiently replaced with nitrogen (the oxygen concentration is 0.0005 to 0.001 vol%), it is heated with a heating medium, and stirring is started when the internal temperature reaches 100°C. 40 minutes after the temperature rise started, the internal temperature was brought to 220°C, and the temperature was maintained at that temperature. The pressure was started at the same time, and the temperature was set to 13.3 kPa within 90 minutes after reaching 220°C. The phenol vapor that is by-produced with the polymerization reaction is introduced into a reflux condenser at 100°C, a certain amount of monomer components contained in the phenol vapor are returned to the reactor, and the uncondensed phenol vapor is introduced to 45°C for condensation And recycle. After introducing nitrogen into the first reactor and temporarily returning to atmospheric pressure, the oligomerized reaction liquid in the first reactor is transferred to the second reactor. Then, the heating and depressurization in the second reactor was started, and the internal temperature was 240° C. and the pressure was 0.2 kPa within 50 minutes. Thereafter, polymerization is carried out until a specific stirring power is reached. At the time when the specific power is reached, nitrogen is introduced into the reactor for recompression, the reaction liquid is taken out in the form of strands, and pelletized by a rotary cutting machine to obtain BHEPF/ISB/DEG=34.8/49.0/16.2[ mol%] polycarbonate resin composed of copolymerization. The reduced viscosity of the polycarbonate resin is 0.430 dL/g, and the glass transition temperature is 128°C. After drying the obtained polycarbonate resin in vacuum at 80°C for 5 hours, a single-screw extruder (manufactured by Isuzu Chemical Industry Co., Ltd., screw diameter 25 mm, cylinder setting temperature: 220°C) and T-die (width 900 mm, set temperature: 220°C), cooling roll (set temperature: 125°C), and film forming device of the coiler to produce a polycarbonate resin film with a thickness of 70 μm. The water absorption rate of the obtained polycarbonate resin film was 1.2%. The obtained polycarbonate resin film was uniaxially stretched 2.0 times at 133°C, thereby obtaining a retardation film A (thickness 50 μm). The Re(550) of the obtained retardation film A is 140 nm, the Rth(550) is 140 nm, and the Re(450)/Re(550) is 0.89. (Production of polarizing element) Prepare A-PET (amorphous-polyethylene terephthalate) film, (manufactured by Mitsubishi Plastics Co., Ltd., trade name: NOVACLEAR SH046 200 μm) as a substrate, and apply corona treatment (58 W/ m² /min). On the other hand, it is prepared to add 1 wt% of acetyl acetyl modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER Z200 (polymerization degree 1200, saponification degree of 99.0% or more, acetyl acetate modified) 4.6%)) PVA (polymerization degree 4200, saponification degree 99.2%), coated on the substrate so that the film thickness after drying becomes 12 μm, and dried by hot air drying at 60°C For 10 minutes, a laminate with a PVA-based resin layer provided on the base material was produced. Then, the layered body was first stretched 2.0 times in the MD direction (Machine direction) at 130°C in air to produce an elongated layered body. Then, a step of immersing the stretched laminate in a boric acid insoluble aqueous solution at a liquid temperature of 30° C. for 30 seconds to insolubilize the PVA layer in which the PVA molecules contained in the stretched laminate are aligned is performed. The boric acid aqueous solution for insolubilization in this step is made to contain 3 parts by weight of boric acid content with respect to 100 parts by weight of water. The colored layered body is produced by dyeing the stretched layered body that has passed the insolubilization step. In this colored laminate system, the stretched laminate is immersed in a dyeing solution so that the PVA layer contained in the stretched laminate adsorbs iodine. The dyeing solution contains iodine and potassium iodide, the temperature of the dyeing solution is set to 30°C, water is used as a solvent, the iodine concentration is set to be in the range of 0.08 to 0.25% by weight, and the potassium iodide concentration is set to be in the range of 0.56 to 1.75% by weight. The ratio of the concentration of iodine to potassium iodide is set to 1 to 7. As the dyeing conditions, the iodine concentration and immersion time were set so that the transmittance of the monomer of the PVA-based resin layer constituting the polarizing element became 40.9%. Next, a step of immersing the colored laminate in an aqueous solution of boric acid for crosslinking at 30°C for 60 seconds to crosslink the PVA molecules of the PVA layer with iodine adsorbed to each other is performed. The boric acid aqueous solution for crosslinking used in this crosslinking step has a boric acid content of 3 parts by weight relative to 100 parts by weight of water, and a potassium iodide content of 3 parts by weight relative to 100 parts by weight of water. Furthermore, the obtained colored layered body is stretched 2.7 times in the same direction as the previous stretch in air at a stretching temperature of 70°C in a boric acid aqueous solution, so that the final stretch magnification becomes 5.4 times. Obtained an optical film laminate containing a polarizing element for trial use. In the boric acid aqueous solution used in this extension step, the content of boric acid was 4.0 parts by weight relative to 100 parts by weight of water, and the content of potassium iodide was set to 5 parts by weight relative to 100 parts by weight of water. The obtained optical film laminate was taken out from the boric acid aqueous solution, and the boric acid adhering to the surface of the PVA layer was washed with an aqueous solution containing 4 parts by weight of potassium iodide content relative to 100 parts by weight of water. The cleaned optical film laminate was dried by a drying step performed with hot air at 60° C. to obtain a polarizing element with a thickness of 5 μm laminated on the PET film. (Production of polarizing plate with retardation layer) In the polarizing element produced in the above manner, for the polarizing element laminated on the PET film with a thickness of 5 μm, the retardation film A is set between its slow axis and the polarizing element through a UV (Ultraviolet) curing adhesive. The angle of the absorption axis is substantially 45°, and it is attached to the surface on the opposite side of the PET. Furthermore, the PET film was peeled from this laminated body, and the polarizing plate with retardation layer was obtained. (Production of liquid crystal display device) The liquid crystal panel is taken out of the liquid crystal display device of a smartphone equipped with an IPS method liquid crystal display device (Xperia Z4 manufactured by SONY: the emission spectrum of the backlight light source is non-continuous), and the polarizing plate arranged on the visible side of the liquid crystal cell is removed, And clean the glass surface of the liquid crystal cell. Next, through the acrylic adhesive (thickness 20 μm), the surface of the polarizer side of the polarizing plate with phase difference plate is set so that the absorption axis of the polarizing element is orthogonal to the initial alignment direction of the liquid crystal cell (No. 1 The angle formed by the retardation axis of the retardation layer and the long side of the liquid crystal panel becomes 45°, and the angle formed by the absorption axis of the polarizing element and the long side of the liquid crystal panel becomes 0°) Laminating on the above-mentioned liquid crystal cell On the side surface, a liquid crystal panel is obtained. The backlight unit of the smart phone is mounted on the liquid crystal panel laminated with a polarizing plate with a phase difference plate as the liquid crystal display device of this embodiment. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. <Example 2> (Production of retardation film B constituting the first retardation layer) The polycarbonate resin (10 kg) obtained in the same manner as in Example 1 was dissolved in dichloromethane (73 kg) to prepare a birefringent layer forming material. Next, the above-mentioned birefringent layer forming material was directly coated on a shrinkable film (longitudinal uniaxially stretched polypropylene film, manufactured by Tokyo Ink Co., Ltd., trade name "Noblen"), and the coating film was dried at a drying temperature of 30°C. Dry for 5 minutes and at 80°C for 5 minutes to form a laminate of shrinkable film/birefringent layer. Using a synchronous 2-axis stretching machine, the obtained laminate was stretched in the MD direction with a shrinkage ratio of 0.80 at a stretching temperature of 155°C, and stretched to 1.3 times in the TD direction (Transverse Direction), thereby on the shrinkable film The retardation film B is formed. Next, this retardation film B is peeled from the shrinkable film. The retardation film B (thickness 60 μm) was obtained in the above manner. Re(550) of the obtained retardation film B is 140 nm, Rth(550) is 70 nm, and Re(450)/Re(550) is 0.89. The slow axis direction of the retardation film B is 90° with respect to the longitudinal direction. (Production of polarizing plate with retardation layer and liquid crystal display device) The above-mentioned retardation film B was used instead of the retardation film A, except that the polarizing plate with the retardation layer was produced in the same manner as in Example 1, and the polarizing plate with the retardation layer was used. The liquid crystal display device was fabricated in the same manner as in Example 1. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. <Example 3> (Production of liquid crystal cured layer constituting the second retardation layer) The following chemical formula (I) (the numbers 65 and 35 in the formula represent the molar% of the monomer unit, and for the convenience of description, it is expressed as a block polymer: a weight average molecular weight of 5000), which is a side chain liquid crystal polymer 20 Parts by weight, 80 parts by weight of polymerizable liquid crystal (manufactured by BASF Corporation: trade name Paliocolor LC242) showing a nematic liquid crystal phase, and 5 parts by weight of a photopolymerization initiator (manufactured by Ciba Specialty Chemicals: trade name Irgacure 907) dissolved in the ring A liquid crystal coating liquid was prepared in 200 parts by weight of pentanone. Next, the coating solution was applied to the base film (Non-ene-based resin film: manufactured by Japan ZEON Co., Ltd., trade name "ZEONEX") with a bar coater, and then heated and dried at 80°C 4 minutes, thereby aligning the liquid crystal. The liquid crystal layer is irradiated with ultraviolet rays to harden the liquid crystal layer, thereby forming a liquid crystal cured layer (thickness: 1.10 μm) that becomes the second retardation layer on the base film. The Re (550) of the liquid crystal cured layer is 0 nm, and the Rth (550) is -100 nm, showing the refractive index characteristic of nz>nx=ny. [化1]

(Production of polarizing plate with retardation layer) Regarding the laminate of the PET film and the polarizing element obtained in the same manner as in Example 1, the above-mentioned liquid crystal cured layer was cured through a UV curable adhesive to remove the substrate film in the peeling direction of the substrate film and the absorption of the polarizing element It is attached to the surface on the opposite side of the PET film so that the axis becomes substantially parallel. Furthermore, the above-mentioned base film was removed, and the retardation film A produced in the same manner as in Example 1 through a UV-curable adhesive, the angle between the slow axis and the absorption axis of the polarizing element became substantially 45° The method is attached to the side of the liquid crystal cured layer opposite to the polarizing element. Furthermore, after peeling the PET film from the laminate, an acrylic protective film or, if necessary, a retardation layer is bonded via a UV curable adhesive to produce a polarizing plate with a retardation layer. (Production of liquid crystal display device) A liquid crystal display device was produced in the same manner as in Example 1, except that the above-mentioned polarizing plate with retardation layer and a smart phone equipped with a different backlight light source were used. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. <Example 4> (Production of retardation film C constituting the first retardation layer) The polycarbonate resin obtained in the same manner as in Example 1 was vacuum dried at 80°C for 5 hours, and then a single-screw extruder (manufactured by Isuzu Chemical Industry Co., Ltd., screw diameter 25 mm, cylinder setting temperature: 220°C) ), T-die (width 900 mm, set temperature: 220°C), cooling roll (set temperature: 125°C), and film-making device of the coiler to produce a polycarbonate resin film with a thickness of 130 μm. The water absorption rate of the obtained polycarbonate resin film was 1.2%. The above-mentioned polycarbonate resin film was obliquely stretched by the method according to Example 1 of Japanese Patent Laid-Open No. 2014-194483 to obtain a retardation film C. The specific production sequence of the retardation film C is as follows: the polycarbonate resin film (thickness 130 μm, width 765 mm) is preheated to 142°C in the preheating zone of the stretching device. In the preheating zone, the clamp spacing between the left and right clamps is 125 mm. Then, the film was put into the first inclined extension area C1, and at the same time, the clamp spacing of the right clamp was increased. In the first inclined extension area C1, it increased from 125 mm to 177.5 mm. The rate of change in clamp spacing is 1.42. In the first oblique extension area C1, the distance between the clamps on the left side of the clamp began to decrease. In the first oblique extension area C1, it was reduced from 125 mm to 90 mm. The rate of change in clamp spacing is 0.72. Furthermore, the film was placed in the second oblique extension area C2, and at the same time, the clamp spacing of the left clamp was increased. In the second oblique extension area C2, it was increased from 90 mm to 177.5 mm. On the other hand, the clamp spacing of the right clamp is maintained at 177.5 mm in the second inclined extension area C2. In addition, at the same time as the above-mentioned oblique extension, the extension is 1.9 times in the width direction. Furthermore, the above-mentioned oblique stretching was performed at 135°C. Then, MD shrinking treatment is performed on the shrinking area. Specifically, the clamp spacing between the left clamp and the right clamp was reduced from 177.5 mm to 165 mm. The shrinkage rate in MD shrinking treatment is 7.0%. The retardation film C (thickness 40 μm) was obtained in the above manner. Re(550) of the obtained retardation film C is 140 nm, Rth(550) is 168 nm, and Re(450)/Re(550) is 0.89. The slow axis direction of the retardation film C is 45° with respect to the longitudinal direction. (Production of polarizing plate with retardation layer and liquid crystal display device) The above-mentioned retardation film C was used instead of the retardation film A, except that a polarizing plate with a retardation layer was produced in the same manner as in Example 1, and the polarizing plate with a retardation layer was used. The liquid crystal display device was fabricated in the same manner as in Example 1. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. ＜Comparative example 1＞ (Production of retardation film D constituting the first retardation layer) A biaxially stretched polypropylene film (manufactured by Toray, trade name "Torayfan" (thickness 60 μm)) is bonded to a commercially available ARTON film (manufactured by JSR, thickness 70 μm) through an acrylic adhesive layer (thickness 15 μm) On both sides. After that, the length direction of the film was maintained by a roll stretcher and stretched to 1.45 times in an air circulation constant temperature oven at 147°C to obtain a retardation film D. Re(550) of the obtained retardation film D is 140 nm, Rth(550) is 70 nm, and Re(450)/Re(550) is 1.00. (Production of polarizing plate with retardation layer and liquid crystal display device) The above-mentioned retardation film D was used instead of the retardation film A. Other than that, a polarizing plate with a retardation layer was produced in the same manner as in Example 1, and the polarizing plate with a retardation layer was used. The liquid crystal display device was fabricated in the same manner as in Example 1. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. ＜Comparative example 2＞ (Production of retardation film E constituting the first retardation layer) Regarding the commercially available ARTON film (manufactured by JSR, thickness 100 μm), the length direction of the film was maintained by a roll stretcher and stretched to 1.8 times in an air circulation constant temperature oven at 147°C to obtain a retardation film E. Re(550) of the obtained retardation film E is 140 nm, Rth(550) is 140 nm, and Re(450)/Re(550) is 1.00. (Production of polarizing plate with retardation layer) Except for using the above-mentioned retardation film E, in the same manner as in Example 1, a polarizing plate with a retardation layer was produced. (Production of liquid crystal display device) Take out the liquid crystal panel from the liquid crystal display device of the smart phone (iPhone5 manufactured by Apple Inc.: the emission spectrum of the backlight light source is continuous) with the liquid crystal display device of the IPS method, remove the polarizing plate arranged on the viewing side of the liquid crystal cell, and The glass surface of the liquid crystal cell is cleaned. Next, through an acrylic adhesive (thickness 20 μm), the surface of the polarizing element side of the polarizing plate with phase difference plate was laminated so that the absorption axis of the polarizing element became orthogonal to the initial alignment direction of the liquid crystal cell. The surface of the visible side of the above-mentioned liquid crystal cell obtains a liquid crystal panel. The above-mentioned liquid crystal panel on which a polarizing plate with a phase difference plate was laminated was mounted on the above-mentioned smartphone as the liquid crystal display device of the present embodiment. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. <Comparative Example 3> (Production of retardation film F constituting the first retardation layer) Use carbon chloride as a precursor of carbonate, (A) 2,2-bis(4-hydroxyphenyl)propane and (B) 1,1-bis(4-hydroxyphenyl) as an aromatic divalent phenol component )-3,3,5-trimethylcyclohexane, and obtained according to conventional methods (A): (B) with a weight ratio of 4:6 and containing the following chemical formula (II) with a weight average molecular weight (Mw) of 60,000 ) And (III) polycarbonate resin [number average molecular weight (Mn)=33,000, Mw/Mn=1.78]. 70 parts by weight of the above polycarbonate resin and a styrene resin with a weight average molecular weight (Mw) of 1,300 [number average molecular weight (Mn) = 716, Mw/Mn = 1.78] (HIMER SB75 manufactured by Sanyo Chemical Industry) 30 weight 1 part was added to 300 parts by weight of dichloromethane, and stirred and mixed at room temperature for 4 hours to obtain a transparent solution. The solution was cast on a glass plate, and placed at room temperature for 15 minutes, then peeled from the glass plate, dried in an oven at 80°C for 10 minutes, and dried at 120°C for 20 minutes to obtain a thickness of 40 μm and a glass transition temperature ( Tg) is a polymer film at 140°C. The light transmittance of the obtained polymer film at a wavelength of 590 nm was 93%. In addition, the in-plane retardation value of the polymer film: Re(590) is 5.0 nm, and the thickness direction retardation value: Rth(590) is 12.0 nm. The average refractive index is 1.576. The obtained polymer film was uniaxially stretched to 1.5 times in an air circulating constant temperature oven at 150° C. to obtain a retardation film F. Re(550) of the obtained retardation film F is 140 nm, Rth(550) is 140 nm, and Re(450)/Re(550) is 1.06. [化2]

(Production of polarizing plate with retardation layer and liquid crystal display device) The above-mentioned retardation film F was used instead of the retardation film A. Except for this, a polarizing plate with a retardation layer was produced in the same manner as in Example 1, and the polarizing plate with a retardation layer was used. The liquid crystal display device was fabricated in the same manner as in Example 1. The liquid crystal display device was allowed to display a white image, and the visibility through polarized sunglasses was evaluated in the white image state. The evaluation results are shown in Table 1. [Table 1] 1st retardation layer Second retardation layer Backlight light source Visibility In-plane phase difference Re550(nm) Wavelength dispersion characteristics (Re450/Re550) Nz coefficient Thickness direction retardation Rth550(nm) spectrum (λ2－λ1)/(△λ2＋△λ1) (λ3－λ2)/(△λ3＋△λ2) {hP2－(hB2＋hB1)/2}/hP2 Example 1 140 0.89 1.0 - non-continuous 1.38 1.63 0.90 good Example 2 140 0.89 0.5 - non-continuous 1.38 1.63 0.90 good Example 3 140 0.89 1.0 -100 non-continuous 1.22 1.71 0.85 good Example 4 140 0.89 1.2 - non-continuous 1.38 1.63 0.90 good Comparative example 1 140 1.00 0.5 - non-continuous 1.38 1.63 0.90 bad Comparative example 2 140 1.00 1.0 - continuous 0.88 0.44 0.55 bad Comparative example 3 140 1.06 1.0 - non-continuous 1.38 1.63 0.90 bad [Industrial availability] The liquid crystal display device of the present invention can be preferably used in portable information terminals (PDA), mobile phones, clocks, digital phase machines, portable game consoles and other mobile devices, computer monitors, notebook computers, photocopiers, etc. Office automation equipment, camcorders, LCD TVs, LCD TVs, microwave ovens and other household electrical equipment, rear monitors, car navigation system monitors, car audio and other automotive equipment, commercial store information monitors and other display equipment, surveillance monitoring Various applications such as security equipment such as monitors, nursing care monitors, and medical monitors, etc.

10: LCD unit 11: substrate 12: substrate 13: liquid crystal layer 20: The first polarizing element 30: The second polarizing element 100: LCD panel 200: retardation layer (first retardation layer) 300: Backlight light source 400: Another retardation layer (second retardation layer) 500: Liquid crystal display device

Fig. 1 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing an example of the emission spectrum of the backlight light source that can be used in the liquid crystal display device of the embodiment of the present invention. Fig. 3 is a diagram schematically showing an example of the emission spectrum of the previous backlight light source.

10: LCD unit

11: substrate

12: substrate

13: liquid crystal layer

20: The first polarizing element

30: The second polarizing element

100: LCD panel

200: retardation layer (first retardation layer)

300: Backlight light source

400: Another retardation layer (second retardation layer)

500: Liquid crystal display device

Claims (7)

A liquid crystal display device including: A liquid crystal panel including a liquid crystal cell, a first polarizing element arranged on the visible side of the liquid crystal cell, and a second polarizing element arranged on the back side of the liquid crystal cell; The retardation layer is arranged on the visible side of the liquid crystal panel; and Backlight source, which illuminates the liquid crystal panel from the back side; The retardation layer is formed of polycarbonate resin; The in-plane retardation Re(550) of the retardation layer is 100 nm～180 nm, and satisfies the relationship of Re(450)<Re(550)<Re(650), The angle formed by the retardation axis of the retardation layer and the long side of the liquid crystal panel is 35°～55°, The backlight light source has a non-continuous emission spectrum. The liquid crystal display device of claim 1, wherein the light emission spectrum of the backlight light source has a peak P1 in the wavelength region of 430 nm to 470 nm, a peak P2 in the wavelength region of 530 nm to 570 nm, and a peak value of P2 in the wavelength region of 630 nm to 670 nm. The wavelength region has a peak P3, Set the wavelength of peak P1 to λ1, the height to hP1, and the half-value width to Δλ1, the wavelength of peak P2 to λ2, the height to hP2, and the half-value width to Δλ2, and the wavelength of peak P3 to λ3, the height is set to hP3 and the half-value width is set to Δλ3, the height of the trough between the peak P1 and the peak P2 is set to hB1, and the height of the trough between the peak P2 and the peak P3 is set to hB2, these Satisfy the following relational expressions (1)～(3): (λ2－λ1)/(Δλ2＋Δλ1)＞1・・・(1) (λ3－λ2)/(Δλ3＋Δλ2)＞1・・・(2) 0.8≦{hP2－(hB2＋hB1)/2}/hP2≦1・・・(3). The liquid crystal display device of claim 1, wherein the refractive index ellipsoid of the retardation layer shows a relationship of nx>nz>ny, and the Nz coefficient is 0.2-0.8. According to any one of claims 1 to 3, the liquid crystal display device further includes another retardation layer whose refractive index ellipsoid shows the relationship of nz>nx≧ny between the liquid crystal panel and the retardation layer. Such as the liquid crystal display device of any one of claim 1 to 3, wherein the backlight light source includes red emitting LED, green emitting LED, and blue emitting LED, and the fluorescent system of the red emitting LED is tetravalent Manganese ion is activated. The liquid crystal display device according to any one of claims 1 to 3, wherein the backlight light source includes blue-emitting LEDs and a wavelength conversion layer including quantum dots. The liquid crystal display device of any one of claims 1 to 3, wherein the absorption axis of the first polarizing element is substantially orthogonal or parallel to the long side of the liquid crystal panel, and the absorption axis of the second polarizing element is relative to the The long sides of the liquid crystal panel are substantially orthogonal or parallel, and the absorption axis of the first polarizing element and the absorption axis of the second polarizing element are substantially orthogonal.

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