TW201115234A - Biaxial compensator film - Google Patents

Abstract

The present invention provides a biaxial compensator film formed by material of dual refractive indexes, having refractive indexes nx, ny and nz, respectively, along the directions of x, y, and z that are normal to each other, and a compensation parameter P between 0.07 and 1.76, wherein P = nx(nz<2> - 1)<1/2> - nz(ny<2> - 1)<1/2>/nz(nx - ny). When the biaxial compensator film is used to perform an optical compensation, the optical compensation effect of which will not be changed by different refractive indexes of the biaxial compensator film, while ensuring the same light leakage improvement effect under dark state for biaxial compensator film materials of different refractive indexes.

Description

201115234 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光學膜（〇ptical film)，特別是指一 種補償膜（Optical Compensator film)。 【先前技術】 參閱圖1 ’現有的液晶顯示裝置包含一上偏光板U、一 下偏光板12、一夾置於該上、下偏光板u、12之間的液晶 13，及一设置於該下偏光板丨2遠離該液晶丨3之一側的背 光源14;該上、下偏光板n、12由朝向該液晶13方向分 別依序具有-保護膜111、121，及_偏光膜112、122，該 液晶13具有負誘電異方性’當由背光源14提供光時，入 射光依序穿越過該下偏光板u、液晶13，及該下偏光板12 時’入射光會受到該上、下偏光板u、12的極化，及該液 晶U偏振狀態的不同，而令該液晶顯示裝置顯示出亮態及 暗態的視覺感受。201115234 VI. Description of the Invention: [Technical Field] The present invention relates to an optical film, and more particularly to an optical compensator film. [Prior Art] Referring to FIG. 1 'The conventional liquid crystal display device includes an upper polarizing plate U, a lower polarizing plate 12, a liquid crystal 13 sandwiched between the upper and lower polarizing plates u and 12, and a liquid crystal 13 disposed therebetween. The polarizing plate 丨 2 is away from the backlight 14 on one side of the liquid crystal cell 3; the upper and lower polarizing plates n and 12 have a protective film 111, 121, and a polarizing film 112, 122, respectively, in the direction toward the liquid crystal 13 The liquid crystal 13 has a negative electric anisotropy. When the light is supplied from the backlight 14, the incident light sequentially passes through the lower polarizing plate u, the liquid crystal 13, and the lower polarizing plate 12, the incident light is received by the upper surface. The polarization of the lower polarizers u, 12 and the polarization state of the liquid crystal U cause the liquid crystal display device to exhibit a visual sense of a bright state and a dark state.

‘、、、而自於該液晶13具有雙光軸的特性，因此入射光 於穿過該液晶13時會產生-相位差Und)，使得液晶在 1、暗態或灰階轉換過程中，因為不同波長的人射光會隨 者視角的變化而產生漏伞认味t 生馮先的情形，特別是在暗態時，隨著 不同視角的變化暗態漏光問題更為清楚。 -般在解決上述液晶顯示裝置暗態漏光的光學補償問 題’大都!以兩個部份進行修正：―是修正在不同視角上 液曰a顯不裔之上、了兩片偏光板之吸光軸在非正交時所產 生的漏光現象，另—是修正液晶分子於不同視角下所造成 201115234 的相位差（A nd)值。 其中，用以修正液晶分子於不同視角下所造成的相位 差（Δη(1)值的光學補償方法，大都是在上、下兩片偏光板的 兩側設置具有適當光學補償值之光學補償膜加以修正，例 如：在上、下偏光板11、12與液晶13之間分別增加一由雙 折射率材料所構成的雙轴補償膜（Biaxial Compensator)l 5、 16’形成如圖2所示具有雙軸補償膜之液晶顯示裝置，利 用雙軸補償膜15、16補償入射光於穿越過該液晶13時產 生的相位差，以提鬲侧視角的對比值，減低暗態漏光的程 度’而可呈現較佳的視角表現。 參閱圖3，圖3是雙轴補償膜沿各方向之折射率、視角 及方位角示意圖。目前設計以雙軸補償膜進行光學補償的 方式，疋以下列式（A)得到一與液晶之相位差值相互補償的 補償參數後Nz後，再以該具有補償參數队的雙軸補償膜來 降低液晶顯示器之暗態漏光。',, and since the liquid crystal 13 has the characteristics of a double optical axis, the incident light will generate a -phase difference Und when passing through the liquid crystal 13, so that the liquid crystal is in the 1, dark state or gray scale conversion process because People with different wavelengths will have a leaky umbrella with the change of the angle of view. In particular, in the dark state, the problem of dark light leakage is more clear with different viewing angles. Generally, the optical compensation problem of the dark light leakage of the above liquid crystal display device is solved. Most of the corrections are made in two parts: - it is to correct the absorption axis of two polarizing plates on different angles of view. The phenomenon of light leakage generated during non-orthogonality is another way to correct the phase difference (A nd) of 201115234 caused by liquid crystal molecules at different viewing angles. Among them, an optical compensation method for correcting the phase difference (Δη(1) value caused by liquid crystal molecules at different viewing angles is generally provided with optical compensation films having appropriate optical compensation values on both sides of the upper and lower polarizing plates. Corrected, for example, by adding a biaxial compensation film (5, 16) formed of a birefringent material between the upper and lower polarizing plates 11, 12 and the liquid crystal 13, respectively, as shown in FIG. The liquid crystal display device of the biaxial compensation film compensates the phase difference generated when the incident light passes through the liquid crystal 13 by using the biaxial compensation film 15, 16 to improve the contrast value of the side view angle and reduce the degree of dark state light leakage. A better viewing angle performance is presented. Referring to Figure 3, Figure 3 is a schematic diagram of the refractive index, viewing angle and azimuth angle of the biaxial compensation film along various directions. Currently, a two-axis compensation film is used for optical compensation, and the following formula (A) After obtaining a compensation parameter that compensates for the phase difference between the liquid crystals and Nz, the dual-axis compensation film with the compensation parameter team is used to reduce the dark state light leakage of the liquid crystal display.

t〜、〜分別為雙軸補償膜沿兩兩相互垂直之X、丫、 z方向之折射率。 …:而以上述方式所設計的雙軸補償膜實際應用於液晶 顯不裝置進仃光學補償時，由於光線折射角度會隨著不同 材料而改變’因此’往往換了不同雙轴補償膜的材料之 後同樣的補償值就無法得到相同的光學補償結果。 參閱圖4 I) 5’圖4是將圖2所示之液晶顯示裝置在 201115234 選定入射波長（λ)為545nm，液晶層的相位差（△“）為 二Onm’在方位角⑷=45。之位置時，固定雙抽補償膜的補 償參數Nz為3，量測該雙軸補償膜在不同平均折射率 (n=(W〜)/3)下的暗態大視角漏光圖；圖5為上述補償參 數Nz=3的雙軸補償膜在不同平均折射率⑻下之全視角對比 圖’圖中深黑線部分為對比度（c_rast Rati〇，cr)=彻的 ，對比線；由圖4及圖5令清楚可知：當補償參數Nz值固t~, ~ are respectively the refractive indices of the biaxial compensation film along the X, 丫, and z directions perpendicular to each other. ...: The two-axis compensation film designed in the above manner is actually applied to the optical compensation of the liquid crystal display device, because the light refraction angle changes with different materials, so the material of the different biaxial compensation film is often changed. After the same compensation value, the same optical compensation result cannot be obtained. Referring to Fig. 4 I) 5' Fig. 4 shows that the liquid crystal display device shown in Fig. 2 has an incident wavelength (λ) of 545 nm selected at 201115234, and the phase difference (Δ" of the liquid crystal layer is two Onm' at an azimuth angle (4) = 45. In the position, the compensation parameter Nz of the fixed double-draw compensation film is 3, and the dark-state large-angle light leakage diagram of the biaxial compensation film at different average refractive indexes (n=(W~)/3) is measured; FIG. 5 is The above-mentioned compensation parameter Nz=3 of the biaxial compensation film under different average refractive index (8) is compared with the full view angle of the figure. The dark black line part of the figure is the contrast (c_rast Rati〇, cr)=complete, contrast line; Figure 5 makes it clear that when the compensation parameter Nz is solid

疋時，大視角漏光的特性會隨著不同的平均折射率而有不 一樣的漏光程度。 由上述結果可知，目前被設計來解決暗態大視角漏光 問題的雙軸補償膜’在折射率改變時其光學補償效果也會 跟者改變’所以當雙轴補償膜的使用材料改變時均須經過 :^實驗才可得到—具有適當補償參數之雙軸補償膜， 僅耗時且會使製程成本增加，因此如何尋求一可適用於 =折射率之雙柄補償膜’使暗態漏光情形得到最佳改善 直疋相關業者不斷尋求解決的方向。 【發明内容】 改盖發明之目的是在提供-種雙轴補償膜，可供 又。暗態漏光’且其光學 而有所變化m 會文到折射率的不同 X、斤良化’錢軸補償膜具有分別沿χ、”ζ方向，且 Z方向為彼此相互垂直之折射率〜、〜，及，” 義—補償參數p， p介 Z疋 公式。 ；Hi.76之間’且符合式⑴之 201115234 /nAnx~ny).......⑴ 本發明之功效在於：利用具有光學補償參數P介於_ •07 -1.76之間’且p符合上述式z所示的雙轴補償膜進行 光予補仏’ S光學補償效果不會受到雙轴補償膜折射率的 不同而有所變化，且對不同折射率之雙軸補償膜材料，均 可得到相同的暗態漏光改善效果。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 X下配5參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 本發明的雙軸補償膜可與偏光板或液晶等結合，或直 接運用於需要光學補償之顯示裝置，而可用於改善因為入 射光於穿越液晶時產生相位差所導致的漏光問題，於本較 佳實把例中疋將該雙軸補償膜直接運用於液晶顯示裝置為 例作說明。 參閱圖6,本發明該具有雙軸補償膜的液晶顯示裝置的 -較佳實施例包含：一上偏光板2、一下偏光板3、一液晶 4、一雙軸補償膜5，及一背光源6。 、該上偏光板2，設置在該液晶4的—側面具有朝鄰近該 液晶4方向依序形成的一保護膜21、—偏光膜22，及一相 位差補償膜23。 該下偏光板3，設置在該液晶4相對該上偏光板2的另 一側面，具有朝鄰近該液晶4方向依序形成的一保護膜 201115234 31，及一偏光膜32。 由於該偏光膜22、32、該保護膜21、22及該相位差補 償膜23的構成材料及種類選擇是本技術領域者所週知，因 此不再多加說明，於本實施例中該偏光膜22、32是由聚乙 烯醇所構成，該保護膜21、22是由三醋酸纖維素所構成， 且該相位差補償膜23為C-plate。 該液晶4由具有負誘電異方性的材料所構成，且相位 差值介於270〜400nm之間。 配合參閱圖7,該雙軸補償膜5為設置在該上偏光板2 與該液晶4之間，由雙重折射率材料所構成，具有分別沿 x、y、z方向，且x、y、z方向為彼此相互垂直之折射率 \％ ’及，，及一介於-0.07〜_1.76之間的補償參數P， 且 Ρ= ηχψι^ - \-n.^ny2 - \ / /nMx~ny).......⑴When 疋, the characteristics of light leakage at large viewing angles will have different light leakage levels with different average refractive indices. It can be seen from the above results that the biaxial compensation film currently designed to solve the dark-state large-angle light leakage problem will change its optical compensation effect when the refractive index changes, so when the material used for the biaxial compensation film changes, After the experiment: ^ can be obtained - the double-axis compensation film with appropriate compensation parameters, only time-consuming and will increase the cost of the process, so how to find a double-handle compensation film that can be applied to = refractive index to make the dark state light leakage situation The best improvement is the direction that the relevant industry is constantly seeking to solve. SUMMARY OF THE INVENTION The purpose of the invention is to provide a dual-axis compensation film. The dark state leaks light' and its optical changes. The difference between the refractive index and the refractive index is the difference between the X and the jinliang's money axis compensation film, which have a refractive index perpendicular to each other along the χ and ζ directions, and the Z direction is perpendicular to each other. ~, and," meaning - compensation parameter p, p-Z 疋 formula. ; Hi.76 between 'and conforms to the formula (1) 201115234 /nAnx~ny)....... (1) The effect of the invention lies in: using the optical compensation parameter P between _ • 07 - 1.76 'and p The optical compensation effect of the biaxial compensation film according to the above formula z is not changed by the refractive index of the biaxial compensation film, and the biaxial compensation film materials of different refractive indexes are The same dark state light leakage improvement effect can be obtained. [Embodiment] The foregoing and other technical contents, features and effects of the present invention will be apparent from the detailed description of a preferred embodiment of the present invention. The biaxial compensation film of the present invention can be combined with a polarizing plate or a liquid crystal or the like, or can be directly applied to a display device requiring optical compensation, and can be used to improve the light leakage problem caused by a phase difference caused by incident light passing through the liquid crystal. In the example, Jiashi will use the biaxial compensation film directly for the liquid crystal display device as an example. Referring to FIG. 6, a preferred embodiment of the liquid crystal display device having the biaxial compensation film of the present invention comprises: an upper polarizing plate 2, a lower polarizing plate 3, a liquid crystal 4, a biaxial compensation film 5, and a backlight. 6. The upper polarizing plate 2 is provided on a side surface of the liquid crystal 4 with a protective film 21, a polarizing film 22, and a phase difference compensation film 23 which are sequentially formed adjacent to the liquid crystal 4. The lower polarizing plate 3 is disposed on the other side of the liquid crystal 4 opposite to the upper polarizing plate 2, and has a protective film 201115234 31 and a polarizing film 32 which are sequentially formed adjacent to the liquid crystal 4. Since the constituent materials and types of the polarizing films 22 and 32, the protective films 21 and 22, and the phase difference compensation film 23 are well known in the art, the polarizing film is not described in this embodiment. 22 and 32 are composed of polyvinyl alcohol, and the protective films 21 and 22 are composed of cellulose triacetate, and the phase difference compensation film 23 is a C-plate. The liquid crystal 4 is composed of a material having a negative electric anisotropy and a phase difference of between 270 and 400 nm. Referring to FIG. 7, the biaxial compensation film 5 is disposed between the upper polarizing plate 2 and the liquid crystal 4, and is composed of a double refractive index material having x, y, and z directions, respectively, and x, y, and z. The directions are mutually perpendicular refractive indices \% ' and , and a compensation parameter P between -0.07 and_1.76, and Ρ = ηχψι^ - \-n.^ny2 - \ / /nMx~ny) .......(1)

該背光源6設置在該下偏光板3遠離該液晶4的一 側。 當由該背光源6提供入射光依序穿越過該下偏光板3 及該液晶4時，由於該液晶分子41具有雙光軸的特性因 此入射光於穿過該液晶4時會產生一相位差（△“），而當產 生相位差的光線在穿過該液晶4進入該雙軸補償膜$時， 則利用該雙軸補償膜5補償入射光於穿越過該液晶4時產 生的相位差，而可提高液晶面板側視角的對比值，減低暗 201115234 〜漏光的各度’且由於本發明該雙軸補償膜$的光學補償 =险不又到該雙軸補償膜5的折射率影響，因此當換用不 之又轴補償膜5材料時’只要固定預定之補償參數’即 °得到相同之光學補償效果’所以可改善習知因變換不同 材料時即需再耗時尋求不同之補償參數的問題，而可更簡 便使用’且可降低因尋求不同之補償參數所耗費的時間及 材料成本。 該雙轴補償膜5的光學補償參數p在以下的說明後應 可更清楚表示。 雙轴補償膜在不同視野角的相位差值可由下列式B求 得：The backlight 6 is disposed on a side of the lower polarizing plate 3 away from the liquid crystal 4. When the incident light provided by the backlight 6 sequentially passes through the lower polarizing plate 3 and the liquid crystal 4, since the liquid crystal molecules 41 have the characteristics of the two optical axes, incident light will generate a phase difference when passing through the liquid crystal 4. (Δ"), and when the light having the phase difference enters the biaxial compensation film $ through the liquid crystal 4, the biaxial compensation film 5 is used to compensate the phase difference generated when the incident light passes through the liquid crystal 4, Moreover, the contrast value of the side view angle of the liquid crystal panel can be increased, and the degree of darkness 201115234~light leakage can be reduced. And since the optical compensation of the biaxial compensation film $ of the present invention is not affected by the refractive index of the biaxial compensation film 5, When the material of the shaft compensation film 5 is replaced, 'as long as the predetermined compensation parameter is fixed, that is, the same optical compensation effect is obtained, so that the conventional compensation effect can be improved by changing the time when the different materials are changed. The problem can be used more easily' and the time and material cost for seeking different compensation parameters can be reduced. The optical compensation parameter p of the biaxial compensation film 5 should be more clearly indicated after the following description. The phase difference of the compensation film at different viewing angles can be obtained by the following formula B:

sin2 # cos2 彡、 L v \ K JSin2 # cos2 彡, L v \ K J

sin2 Θ .........(B) 當上式（D)0=〇度時，可將其簡化成式c。 ^_______\ R( Θ , 0 =〇)= d —- sin2 Θ -Jny2 - sin2 Θ .........(C)Sin2 Θ .........(B) When the above formula (D)0=〇, it can be reduced to the equation c. ^_______\ R( Θ , 0 =〇)= d —- sin2 Θ -Jny2 - sin2 Θ .........(C)

、n: v J 上式（E)當Θ =0度時，可將其簡化成式C-2，得到一軸 上的平面補償值R。。 R( Θ =0，0 =〇)=d(Wjc-%)=R〇 ..........(C-2) 上式（E)當θ =90度時，可將其簡化成式C-2 ’得到一 軸上的縱向補償值Rth'。 R( Θ -90, φ =〇)= d ~&gt;Ιη：2~1- jn 2 -ίΐ =Rth U V y J .......(C-2) 201115234 發明之雙軸補償膜的補償參數/R。，且 P= n^4^\~nz^~{/ /η-Χη,-η^ .......⑴ 要 明 β , ’本發明之雙轴補償膜會對應不同液晶產 生之相位差而且士 有一補償參數P，由於該補償參數P即為該 雙軸補償膜的輪上縱向補償值與該轴上平面補償值r。 的比值’因此當該雙軸補償膜的材料改變使得 &amp; ~亦跟著變化時’補償參數p不會因〜、％，及，〜 的不同而有所改變；較佳地，該雙轴補償膜的補償參數? 是介於-0.07〜-1 &gt; 0a &gt; • 0之間’且適用相位差介於270nm〜400nm 之間的液晶’更佳地，該雙軸補償膜的補償參數p是介於_ 之間且適用相位差介於300nm〜350nm之間的 液晶。 參閱圖8〜1〇’圖8是以相位差（Δικί)介於270〜400nm 之間的液晶分子與補償參數P之作圖結果，圖9是本發明 该較佳實施例選定在人射光波長（λ )為545nm，液晶分子的 相位差（△：!(!)為330nm，在方位角（0)=45。的位置時，補 償參數值固定為’雙軸補償膜的軸上平面補償值R。為 62〜79nm的條件下，具有不同平均折射率（n)的雙軸補償膜 的暗態大視角漏光圖；圖1〇為具有不同平均折射率（η)的雙 軸補償膜之全視角對比圖，圖中深黑線部分為對比度, n: v J above (E) When Θ =0 degrees, it can be reduced to the formula C-2 to obtain the plane compensation value R on one axis. . R( Θ =0,0 =〇)=d(Wjc-%)=R〇..........(C-2) The above formula (E) can be used when θ = 90 degrees Simplified into the formula C-2 'to obtain the longitudinal compensation value Rth' on one axis. R( Θ -90, φ =〇)= d ~&gt;Ιη:2~1- jn 2 -ίΐ =Rth UV y J .......(C-2) 201115234 Invented biaxial compensation film Compensation parameter /R. And P= n^4^\~nz^~{/ /η-Χη,-η^ .......(1) To explain β, 'The biaxial compensation film of the present invention corresponds to the phase of different liquid crystal generation The difference is a compensation parameter P, because the compensation parameter P is the on-wheel longitudinal compensation value of the biaxial compensation film and the on-axis plane compensation value r. The ratio 'so when the material of the biaxial compensation film changes such that &amp; ~ also changes, the compensation parameter p does not change due to the difference of ~, %, and ~; preferably, the two-axis compensation The compensation parameter of the film is between -0.07~-1 &gt; 0a &gt; • 0' and the liquid crystal with a phase difference between 270 nm and 400 nm is used. More preferably, the compensation parameter of the biaxial compensation film is p. It is between _ and applies a liquid crystal with a phase difference between 300 nm and 350 nm. Referring to FIG. 8 to FIG. 8A, FIG. 8 is a result of plotting liquid crystal molecules with a phase difference (Δικί) between 270 and 400 nm and a compensation parameter P. FIG. 9 is a wavelength of human light selected in the preferred embodiment of the present invention. (λ ) is 545 nm, the phase difference of the liquid crystal molecules (Δ:! (!) is 330 nm, and the position of the azimuth angle (0)=45. The compensation parameter value is fixed to the on-axis plane compensation value of the 'double-axis compensation film'. R. is a dark-state large-angle light leakage pattern of a biaxial compensation film having different average refractive indices (n) under the condition of 62 to 79 nm; FIG. 1 is a full-length two-axis compensation film having different average refractive indices (η) View angle comparison chart, the dark black line part of the figure is the contrast

(Contrast Ratio，CR) =500 的等對比線 Q 由圖8可知，本發明該雙軸補償膜的補償參數p在符 201115234 合上述式⑴之公式之限定條件下，在不同的相位差(“d)時 均可對應出-特；t之補償參數值，且由圖9〜1G得知各固定 該雙軸補償㈣㈣參數料，即使改變雙㈣^的平 均折射率⑻，其在不同視野㈣暗態漏光情形均可得到相 同之改善，即本發明該雙軸補償膜的補償特性不受到該雙 軸補償膜本身材料之折射率的影響，均可對液晶顯示器的 暗態大視角漏光得到相同的改善，而可解決習知因雙轴補 償膜之材料的折射率不同時，大視角暗態漏光的特性亦會 隨著不同材料的平均折射率⑻而有不-樣的料程度的缺 點。 參閱圖11值得一提的是，本發明該液晶顯示裝置可更 包含一設置在該液晶4與該下偏光板3之間的雙軸補償膜 7,藉由同時設置在該上下偏光板該的雙軸補償膜5、7可 更進一步改善該液晶顯示器的暗態漏光問題。 參閱圖12〜圖丨4，圖12是以相位差（Δη(1)介於 270〜400nm之間的液晶分子與補償參數p之作圖結果， 13〜14是圖7所不的液晶顯示裝置之暗態漏光量測結果，圖 13為選定在入射波長（λ )為545nm，液晶層的相位差（And) 為295nm，在方位角（0)=45。的位置、固定補償參數值為_ 〇·23，及雙軸補償膜的軸上平面補償值R。為43〜6〇nm的條 件下’不同平均折射率之雙軸補償膜的暗態大視角漏光 圖’圖14則為不同平均折射率（n)之雙軸補償膜的全視角對 比圖圖中，木黑線部分為對比度（Contrast Ratio，CR) =900 的等對比線。 10 201115234 上ϋκτ、^可知’當雙轴補償膜的補償參數p在符合 限定條件下，其對具有不时均折射率 視角視野角的暗態穿透率均低於G.G1%，對暗態大 視角漏先問題可得到極佳之改善。 所述本發明利用一具有補償參數p介於_〇〇7〜_ β的又轴補仏膜，作為改善液晶顯示器的暗態大視角漏 ^ 不僅簡便，且在雙軸補償膜的補償參數ρ為符合(Contrast Ratio, CR) = 500 isotope line Q. As can be seen from Fig. 8, the compensation parameter p of the biaxial compensation film of the present invention is different in phase difference under the condition of the formula 201115234 and the formula of the above formula (1) (" d) can correspond to the value of the compensation parameter of the special-t; t, and it is known from Fig. 9~1G that each of the two-axis compensation (four) (four) parameter material is fixed, even if the average refractive index (8) of the double (four)^ is changed, it is in different fields of view (four) In the case of the dark state light leakage, the same improvement can be obtained, that is, the compensation characteristic of the biaxial compensation film of the present invention is not affected by the refractive index of the material of the biaxial compensation film itself, and the light leakage of the dark state of the liquid crystal display can be the same. The improvement can solve the conventional problem that when the refractive index of the material of the biaxial compensation film is different, the light leakage characteristics of the large viewing angle dark state also have the disadvantage of not being the same as the average refractive index (8) of the different materials. Referring to FIG. 11, it is worth mentioning that the liquid crystal display device of the present invention further includes a biaxial compensation film 7 disposed between the liquid crystal 4 and the lower polarizing plate 3, which is simultaneously disposed on the upper and lower polarizing plates. Biaxial compensation film 5, 7 can Further improving the dark light leakage problem of the liquid crystal display. Referring to FIG. 12 to FIG. 4, FIG. 12 is a result of plotting the liquid crystal molecules with a phase difference (Δη(1) between 270 and 400 nm and the compensation parameter p, 13 ～14 is the dark state light leakage measurement result of the liquid crystal display device shown in FIG. 7, and FIG. 13 is selected such that the incident wavelength (λ) is 545 nm, the phase difference (And) of the liquid crystal layer is 295 nm, and the azimuth angle (0)= 45. The position, the fixed compensation parameter value is _ 〇 · 23, and the on-axis plane compensation value R of the biaxial compensation film. Under the condition of 43~6 〇 nm, the dark state of the biaxial compensation film with different average refractive indexes The large-angle light leakage diagram 'Fig. 14 is a full-view contrast diagram of the biaxial compensation film with different average refractive indices (n), and the black line portion is a contrast line of Contrast Ratio (CR) = 900. 10 201115234 The upper ϋκτ, ^ knows that when the compensation parameter p of the biaxial compensation film meets the qualification conditions, the dark state transmittance of the view angle with the view angle of the time-average refractive index is lower than G.G1%, and the dark state is large. The leakage problem can be greatly improved. The invention utilizes a compensation parameter The reaming film of the number p between _〇〇7 and _β is not only simple as a large angle of view for improving the dark state of the liquid crystal display, but also the compensation parameter ρ of the biaxial compensation film is in accordance with

上述式⑴之條件下’其補償特性不受到該雙轴補償膜本身 材料之折射率的影響，均可對液晶顯示器的暗態大視角漏 光得到相同較善，故確實能達成本發明之目的。 惟以上所述者，僅為本發明之較佳實施例與具體例而 已，當不能以此限定本發明實施之範圍，即大凡依本發明 申請專利範圍及發明說明内容所作之簡單的等效變化與修 飾’皆仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一示意圖，說明習知垂直配向型液晶顯示裝 置； 圖2是一示意圖’說明圖丨中更包含有雙軸補償膜的 態樣； 圖3是一示意圖，說明習知之雙轴補償膜的方向及角 度； 圖4是一曲線圖，說明圖2之光學補償膜與不同的液 晶分子相位差（Δ nd )之作圖結果 圖5是一全視角對比圖，說明圖2之液晶顯示裝置的 11 201115234 全視角對比結果；Under the condition of the above formula (1), the compensation characteristic is not affected by the refractive index of the material of the biaxial compensation film itself, and the dark state large-angle light leakage of the liquid crystal display can be obtained as the same, so that the object of the present invention can be achieved. The above is only the preferred embodiment and the specific examples of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change according to the scope of the invention and the description of the invention. And the modifications are still within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional vertical alignment type liquid crystal display device; FIG. 2 is a schematic view showing an embodiment in which a biaxial compensation film is further included; FIG. 3 is a schematic view showing The direction and angle of the conventional biaxial compensation film; FIG. 4 is a graph illustrating the result of the phase difference (Δ nd ) of the optical compensation film of FIG. 2 and different liquid crystal molecules. FIG. 5 is a full view comparison chart, illustrating Figure 11 is a liquid crystal display device 11 201115234 full viewing angle comparison result;

圖0是一示意圖’說明本發明較佳實施例之液晶顯示 裝置； ~ U 圖7是一示意圖，說明該較佳實施例之雙軸補償膜的 方向及角度示意圖； 圖8是一曲線圖，說明圖6具有不同之補償參數值的 又轴補償膜與不同的液晶分子相位差（And)之作圖結果； 圖9是一暗態大視角漏光圖，說明圖6之液晶顯示裝 置的暗態大視角漏光量測結果； 鲁 圖10是一全視角對比圖，說明圖6的全視角對比量測 結果； 圖11是一示意圖，說明本發明該較佳實施例之液晶顯 示裝置的另一態樣； 圖12是一曲線圖，說明圖11具有不同之補償參數值的 雙轴補償膜與不同的液晶分子相位差（△nd)之作圖結果； 圖13是一暗態大視角漏光圖，說明圖11的暗態大視角 ® 漏光量測結果；及 圖14是一全視角對比圖，說明圖11的全視角對比量測 結果。 12 201115234 【主要元件符號說明】 2 ..........上偏光板 21 ........保護膜 22 ........偏光膜 23 ........相位差補償膜 3 ..........下偏光板 3 1......保護膜 32........偏光膜 4’………液晶 5 ..........雙韩補償膜 6 ..........背光源 7 &quot;雙韩補償膜FIG. 0 is a schematic view showing a liquid crystal display device according to a preferred embodiment of the present invention; FIG. 7 is a schematic view showing the direction and angle of the biaxial compensation film of the preferred embodiment; FIG. 8 is a graph. FIG. 6 is a graph showing the phase difference between the axial compensation film and the different liquid crystal molecules with different compensation parameter values; FIG. 9 is a dark state large-angle light leakage diagram illustrating the dark state of the liquid crystal display device of FIG. Large viewing angle light leakage measurement result; Lutu 10 is a full viewing angle comparison diagram, illustrating the full viewing angle comparison measurement result of FIG. 6; FIG. 11 is a schematic diagram illustrating another state of the liquid crystal display device of the preferred embodiment of the present invention Figure 12 is a graph illustrating the results of the phase difference (Δnd) of the two-axis compensation film with different compensation parameter values and different liquid crystal molecules in Figure 11; Figure 13 is a dark state large-angle light leakage diagram, The dark state large viewing angle о light leakage measurement result of FIG. 11 is illustrated; and FIG. 14 is a full view angle comparison diagram illustrating the full view angle comparison measurement result of FIG. 12 201115234 [Description of main component symbols] 2 ..........Upper polarizer 21 ........Protective film 22 ........Polarized film 23 ..... ...phase difference compensation film 3 ..... lower polarizing plate 3 1 ... protective film 32........ polarizing film 4'... liquid crystal 5 . .........Shuanghan compensation film 6 ..........Backlight 7 &quot;Shuanghan compensation film

1313

Claims (1)

201115234 七、申請專利範圍： !•-種雙轴補償膜，用於補償入射光於穿過液晶分子時產 生之相位差，包含： 該雙軸補償膜由雙重折射率之材料所構成，具有分 別沿兩兩相互垂直之x、y、z方向的折射率〜、〜、 〜，及一介於-0.07與-1&gt;76的補償參數p，且 P 2·依據申請專利範園裳1 — x 軏圍第1項所述的雙軸補償膜，其中，該 雙軸補償膜還罝右厘许一, 遢/、有厚度d，軸上平面補償值R。，及一轴 上縱向補償值Rth,， Α巾， th ^ τ &gt; R0= d{nx-ny) Rth= ' d 且 p= Rth&quot;R0。 3. 依據申明專利叙圍第2項所述的雙轴補償膜，其中，該 補償參數P是介y 、 义’丨於-0.37〜-0.75之間。 依據申請專利筋 料是選-軏圍第1項所述的雙轴補償膜，其構成材 :' 3黾纖維素、環烯烴共聚物、環烯烴聚合 物、熱可塑性樹月匕，十甘士 何如，或其中之一组合。 14201115234 VII. Patent application scope: •• A kind of biaxial compensation film for compensating the phase difference generated when incident light passes through liquid crystal molecules, including: The biaxial compensation film is composed of materials with double refractive index, respectively The refractive index of the x, y, and z directions perpendicular to each other is ～, 〜, 〜, and a compensation parameter p of -0.07 and -1 &gt; 76, and P 2 · according to the patent application Fan Yuanshang 1 - x 軏The biaxial compensation film according to Item 1, wherein the biaxial compensation film is further defined by a right ,, a thickness d, and an on-axis plane compensation value R. And the longitudinal longitudinal compensation value Rth,, Α, th ^ τ &gt; R0 = d{nx-ny) Rth = ' d and p = Rth&quot;R0. 3. The biaxial compensation film according to claim 2, wherein the compensation parameter P is between y and y = between -0.37 and -0.75. According to the patented reinforced material, the biaxial compensation film described in item 1 of the selection is as follows: '3 黾 cellulose, cyclic olefin copolymer, cycloolefin polymer, thermoplastic tree 匕, ten gans How as, or a combination of them. 14