201137455 六、發明說明： 【發明所屬之技術領域】 本發明相關於一種改善液晶顯示面板顯示品質之方法， 尤指一種可改善液晶顯示面板色偏現象之方法。 【先前技術】 液晶顯示器（liquid crystal display，LCD)具有低輕射、體積 小及低耗能等優點，已逐漸取代傳統的陰極射線管（cathode ray tube，CRT)顯示器，進而被廣泛地應用在筆記型電腦、個 人數位助理（personal digital assistant，PDA)、平面電視，或 行動電話等資訊產品上。液晶分子在不同排列狀態下對光線 具有不同偏振或折射效果，因此可透過控制光線的穿透率來 提供色彩豐富的影像。依照驅動方式，液晶顯示器之種類主 要可分為靜態驅動（Static )、被動式（Passive )驅動，以及 主動矩陣驅動（Active Matrix )等三種。目前主要應用多半 為主動式驅動’其中扭曲向列（Twisted Nematic，TN )驅動 和超扭曲向列（Super Twisted Nematic，STN )驅動兩種技術 結構簡單’但是在較大尺寸的應用中，使用者在斜視時觀察 時容易有影像偏紅的現象，此種晝面偏紅現象在高飽和度面 板上更為顯著。 201137455 第1圖至第3圖為先前技術中液晶顯示面板驅動方式之 不意圖，其中第1圖顯示了一液晶顯示面板之光線穿透頻譜 CF0( λ )’第2圖顯示了 一般色彩飽和度液晶顯示面板之背 光頻譜BLN (人），而第3圖顯示了高色彩飽和度液晶顯示 面板之背光頻譜BLH ( λ )。在一般色彩飽和度的應用中， 當以一特定視角0觀察晝面時，波長範圍λ1〜λ2内之光線 • 強度正比於;在高色彩飽和度的應用中，當以 一特定視角0觀察畫面時，波長範圍λ工〜λ2内之光線強度 正比於。 Λ1 在第1圖中，CF〇 ( λ )為視角〇度時之正視光線穿透 頻4，CFm ( λ )為視角30度時之斜視光線穿透頻譜，而 CFeo ( λ )為視角60度時之斜視光線穿透頻譜。如第】圖 所不，在635nm〜70〇nm的長波長範圍内，光線穿透率會隨 著視角增加而上升，而在45〇nm〜490nm的短波長範圍内， 光線穿透率會著視角增加而降低。換而言之，若觀賞書面 的視角增加，紅光（波長約莫7〇〇nm )穿透率會變大，而藍 光（波長約莫435.8nm)穿透率則會變小，因此在斜視時會 形成畫面偏紅現象，影響顯示品質。 在第2圖和第3圖所示之背光頻譜中，藍色波峰範圍約 201137455 為420 nm至450 nm’綠色波峰範圍約為530nm至560 nm， 紅色波峰範圍約為600 nm至630 nm。在第2圖所示之一般 色彩飽和度液晶顯示面板之背光頻譜BLn ( λ )中，中波長 範圍之綠光亮度波峰具最大值，若長波長範圍之紅光穿透率 因斜視而〜加時’中波長範圍之綠光可提供混色以猶微減少 現ί:但仍然無法有效地改善晝面的顯示品質。 (λ)中色錢和度液晶顯示面板之背光頻譜BLh 並鉦中浊晷夂嚀具最大值，在斜視時 極為顯著。 因此晝面偏紅的現象會 【發明内容】 本發明提供一種可改善 法，其包含調H^岭色偏現象之方 仪日日顯不面板之—彩 紅光穿透率，使得在—特定視角下，片在正視時之 所對應之-斜視色溫其值高於—預==穿透率 穿透率求出液晶_岐之—正穿降後之紅光 正視光線穿透頻譜來調 線穿透頻谱;以及依據 合-正視規格。 如使液晶顯示面板符 【實施方式】 201137455 第4a和4b圖為液晶顯示面板之正視/斜視情形之示意 圖。在第4a圖中’ d代表彩色濾光片之厚度，0代表視角， 因此正視時光線在彩色濾光片内之行進路徑長度約為d，而 斜視時光線在彩色濾光片内之行進路徑長度約為。 一般通常以Θ =45來觀察面板中央斜視色偏現象，而面板兩 側的實際視角會大於45度。因此，本發明可採用更嚴格的 斜視視角標準。第4a圖以0 =60。來做說明，此時正視時光 φ 線在彩色濾光片内之行進路徑長度約為d，而斜視時光線在 彩色濾光片内之行進路徑長度約為2d。 第4b圖顯示了正視光線穿透率CF〇( λ )、斜視光線穿透 率CF6〇(又）以及兩者之間差值acf的關係。當0=6〇。時， 斜視時之光線行進路徑長度會加倍，使得CF6g ( λ )約莫為 CF〇 ( Λ )之平方值，因此當正視光線穿透率CF〇 (久）降 低時，斜視光線穿透率CF6G U )會以更大的幅度減少，亦 即正視/斜視光線穿透率之差值會隨著正視光線穿透率 ( λ )呈正向變化。因此’本發明可透過調整彩色遽光 片參數來降低正視時之紅光穿透率，進而改#斜視時畫面偏 紅的情況。 衫色渡光片之X、Υ、Ζ參數可由下列公式來表示： ⑴201137455 VI. Description of the Invention: [Technical Field] The present invention relates to a method for improving the display quality of a liquid crystal display panel, and more particularly to a method for improving the color shift phenomenon of a liquid crystal display panel. [Prior Art] Liquid crystal display (LCD) has the advantages of low light weight, small size and low energy consumption, and has gradually replaced the traditional cathode ray tube (CRT) display, and is widely used in Notebook computer, personal digital assistant (PDA), flat-screen TV, or mobile phone and other information products. Liquid crystal molecules have different polarization or refraction effects on light in different alignment states, so they can provide color-rich images by controlling the transmittance of light. According to the driving method, the types of liquid crystal displays can be mainly classified into static driving (Static), passive (passive) driving, and active matrix driving (Active Matrix). At present, most of the main applications are active drives. The Twisted Nematic (TN) drive and the Super Twisted Nematic (STN) drive are two simple structures. But in larger applications, users When the squint is observed, it is easy to have a reddish image, and the redness of the face is more prominent on the high saturation panel. 201137455 Fig. 1 to Fig. 3 are schematic diagrams showing the driving method of the liquid crystal display panel in the prior art, wherein Fig. 1 shows the light transmission spectrum CF0(λ) of a liquid crystal display panel. Fig. 2 shows the general color saturation. The backlight spectrum BLN (human) of the liquid crystal display panel, and the third figure shows the backlight spectrum BLH (λ) of the high color saturation liquid crystal display panel. In general color saturation applications, when viewing a pupil at a particular viewing angle 0, the intensity of the light in the wavelength range λ1 to λ2 is proportional; in applications with high color saturation, when viewing the image at a particular viewing angle 0 When the wavelength range λ work ~ λ2 within the light intensity is proportional to.第1 In Fig. 1, CF〇(λ) is the front view light penetration frequency 4 when the viewing angle is ,, CFm (λ) is the squint light penetration spectrum when the viewing angle is 30 degrees, and CFeo (λ) is the viewing angle 60 degrees. The squint light penetrates the spectrum. As shown in the figure, in the long wavelength range of 635nm~70〇nm, the light transmittance will increase with the increase of the viewing angle, and in the short wavelength range of 45〇nm~490nm, the light transmittance will The angle of view increases and decreases. In other words, if the viewing angle of viewing increases, the transmittance of red light (wavelength about 7〇〇nm) will become larger, and the transmittance of blue light (wavelength about 435.8nm) will become smaller, so it will be in strabismus. The phenomenon of reddish picture is formed, which affects the display quality. In the backlight spectrum shown in Figures 2 and 3, the blue peak range is approximately 201137455 for the 420 nm to 450 nm' green peak range of approximately 530 nm to 560 nm, and the red peak range is approximately 600 nm to 630 nm. In the backlight spectrum BLn ( λ ) of the general color saturation liquid crystal display panel shown in FIG. 2, the green light luminance peak in the middle wavelength range has a maximum value, and if the long wavelength range of the red light transmittance is due to squinting The green light in the mid-wavelength range provides a color mixture to reduce the thickness of the picture: but still does not effectively improve the display quality of the face. (λ) The color spectrum and the backlight spectrum BLh of the liquid crystal display panel are the maximum value of the turbidity in the sputum, which is extremely significant in squinting. Therefore, the phenomenon that the face is reddish will result in the invention. The present invention provides an improved method, which includes a color red light transmittance of a panel that is tuned to the H^ ridge color shift phenomenon, so that the specific From the perspective of the film, the squint color temperature corresponding to the film is higher than the pre-== penetration rate of the liquid crystal _ 岐 - the red light of the forward-looking red light is transmitted through the spectrum to adjust the line Penetration spectrum; and according to the combination - face to face specifications. For example, the liquid crystal display panel symbol [Embodiment] 201137455 Figures 4a and 4b are schematic views of the front view/squint of the liquid crystal display panel. In Fig. 4a, 'd represents the thickness of the color filter, and 0 represents the angle of view. Therefore, the length of the path of the light in the color filter is about d in the front view, and the path of the light in the color filter in the squint. The length is approximately. Generally, Θ = 45 is used to observe the squint color shift phenomenon in the center of the panel, and the actual viewing angle on both sides of the panel is greater than 45 degrees. Therefore, the present invention can adopt a more stringent squint viewing angle standard. Figure 4a shows 0 = 60. To illustrate, the length of the path of the φ line in the color filter is about d, and the length of the path of the light in the color filter is about 2d. Figure 4b shows the relationship between the forward light transmittance CF〇(λ), the strabismus light transmittance CF6〇 (again), and the difference acf between the two. When 0=6〇. When squinting, the length of the ray path is doubled, so that CF6g ( λ ) is about the square value of CF 〇 ( Λ ), so when the light transmittance CF 〇 (long) decreases, the squint light transmittance CF6G U ) will be reduced by a larger extent, that is, the difference in the light transmittance of the front/squint will change positively with the forward light transmittance (λ). Therefore, the present invention can reduce the red light transmittance in front view by adjusting the color light film parameters, thereby changing the situation in which the picture is reddish during squinting. The X, Υ, and Ζ parameters of the shirt color crossing film can be expressed by the following formula: (1)
X = k\CF{X)*P(X)*~x(X)dX 201137455X = k\CF{X)*P(X)*~x(X)dX 201137455
Y = k jCF(^,)*p^)*y{X)dA vis yZ) Z = k\CF{X)*p(X)*~z(x)dx 在上述公式中，k值為常數’Cf(a)代表特定波長又之 光線穿透率’ P ( ；i )代表特定波長λ之光源強度（例如標 準C光源之強度）’積分符號丨代表可見光的波長區域，而 vis ^⑷、[⑷、9々分別為CIE色度系統中定義之人眼三刺激值 (tdstimuius values)。其中公式⑺所示之γ值相關於光線穿 透率，若在紅光、綠光、藍光波長範_分別積分公式(2)， 則可分別求出對應於紅光、綠光、藍光穿透率光之Υ值YR、 YG、YB。本發明可透過使用不同吸光能力之色料、改變色料 的濃度，或是改變彩色遽光片之厚度來調整各色光之γ值， 進而降低斜視時之紅光穿透率以改善色偏。 第5圖和第6圖說明了本發明改善斜視色偏之方法，第5 2斜視色溫和彩色濾、光片參數之關係圖，而第6圖為斜視 巴差ΔΕ和彩色濾光片參數之關係圖。在第5圖 彩色濾光片之參數中紅光¥值Yr和綠光¥值％之比‘‘、、 而縱轴為斜視時之液晶顯示面板之色溫。在第6圖中細 為紅光丫值YR和綠光丫值Υβ之比值’而縱軸為 ： 液晶顯示面板之色差值Δ£。色差值ΔΕ之計算公式’ x) + (yi-y)2]1/2 ’其中(Xl，yi)係為在液晶顯示面板上=(以1 201137455 某特定視請觀察到之色度值，（x，y)係為由液晶顯示面板 正上方觀察到的色度值，而色度值係由CIE色度座標所定 義。 先前技術之液晶顯示面板為了提升光線穿透率，一般會 將YR/YB之值設在〇,3〜〇·455之間，此時斜視色溫低於 3800Κ ’畫φ偏紅現象極為顯著。本發侧是調整彩色滤光 片參數中之YR值以降低斜視時之紅光穿透率。如第5圖和 第6圖所示，若是將Yr/Yb<值調至小於一預定值（例如〇 3) 時可將斜視色溫调升至高於一特定色溫（例如38狐）， 此時曰大中田降低斜視時之色差值，進而改善晝面偏紅的情 形。 由於降低紅光穿透率亦會影響正視畫面的顯示品質，本 發明會依據調整後之Y值套入液晶顯示面板取得光線穿透 頻譜’再依此難背光頻譜以讓液錢示面板具符合正視規 格之特定白點色度和色溫’例如白點色度（〇 313 〇 329)和 色溫65G0K。因此’本發明能在符合正視規格的情況下改盖 斜視色偏。在前述朗t内容中所舉例之數字僅為了說日林 發明之實施例，並不限定本發明之範疇。 以上所述僅為本發明之較佳實施例，凡依本發明申請專 利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 201137455 【圖式簡單說明】 第1圖為一液晶顯示面板之光線穿透頻譜。 第2圖為一般色彩飽和度液晶顯示面板之背光頻譜。 第3圖為一高色彩飽和度液晶顯示面板之背光頻譜。 第4a和4b圖為液晶顯示面板之正視/斜視情形之示意圖 第5圖為本發明中斜視色溫和彩色濾光片參數之關係圖。 第6圖為本發明中斜視色差和彩色濾光片參數之關係圖。 【主要元件符號說明】 光線穿透頻譜 背光頻譜 斜視色差 彩色濾光片厚度 斜視光線行進路徑 彩色濾光片參數 CF〇 ⑴、CF3〇 ⑴、CF6〇 ⑴ BLn ( λ ) ' BLh ( λ ) ΔΕ d 2dY = k jCF(^,)*p^)*y{X)dA vis yZ) Z = k\CF{X)*p(X)*~z(x)dx In the above formula, k is a constant 'Cf(a) represents a specific wavelength and the light transmittance ' P ( ;i ) represents the intensity of the light source at a specific wavelength λ (for example, the intensity of a standard C light source) 'the integral symbol 丨 represents the wavelength region of visible light, and vis ^(4), [(4), 9々 are the human eye tristimulus values (tdstimuius values) defined in the CIE chromaticity system, respectively. The γ value shown in the formula (7) is related to the light transmittance. If the red, green, and blue wavelength ranges are respectively integrated into the formula (2), the corresponding gamma, green, and blue light penetrations can be obtained. The threshold value of the light is YR, YG, YB. The invention can adjust the gamma value of each color light by using the color materials of different light absorbing ability, changing the concentration of the color material, or changing the thickness of the color light slab, thereby reducing the red light transmittance at the time of squinting to improve the color shift. Fig. 5 and Fig. 6 illustrate the method for improving the squint color shift of the present invention, the relationship between the squint color temperature and the color filter and the light film parameters, and the sixth figure is the squint difference ΔΕ and the color filter parameters. relation chart. In the parameter of the color filter of Fig. 5, the ratio of the red light value Yr and the green light value % is ' ‘, and the vertical axis is the color temperature of the liquid crystal display panel when squinting. In Fig. 6, the ratio of the red 丫 value YR to the green 丫 value Υ β is fined and the vertical axis is: the color difference Δ£ of the liquid crystal display panel. The formula for calculating the color difference ΔΕ ' x) + (yi-y) 2] 1/2 ' where (Xl, yi) is on the liquid crystal display panel = (1 201137455 chromaticity value observed for a particular viewing (x, y) is the chromaticity value observed directly above the liquid crystal display panel, and the chromaticity value is defined by the CIE chromaticity coordinate. In order to improve the light transmittance, the prior art liquid crystal display panel generally The value of YR/YB is set between 〇, 3~〇·455. At this time, the color temperature of squint is lower than 3800Κ. The phenomenon of reddish φ is very significant. The side of the hair is adjusting the YR value in the color filter parameters to reduce strabismus. The red light transmittance of the time. As shown in Fig. 5 and Fig. 6, if the Yr/Yb< value is adjusted to less than a predetermined value (for example, 〇3), the squint color temperature can be raised above a specific color temperature ( For example, 38 foxes), at this time, 曰大中田 reduces the color difference when squinting, and thus improves the situation of reddish enamel. Since reducing the red light transmittance will also affect the display quality of the front view, the present invention will be based on the adjusted The Y value is nested in the liquid crystal display panel to obtain the light penetration spectrum, and then the difficult backlight spectrum is used to allow the liquid money to display the panel. The specific white point chromaticity and color temperature of the specification are as follows: for example, white point chromaticity (〇313 〇 329) and color temperature 65G0K. Therefore, the present invention can change the slanting color shift in the case of conforming to the front view specification. The exemplified figures are merely examples of the inventions of the invention, and are not intended to limit the scope of the invention. The foregoing is only a preferred embodiment of the invention, and the equivalent variations and modifications made by the scope of the invention All should fall within the scope of the present invention. 201137455 [Simple diagram of the diagram] Figure 1 is the light penetration spectrum of a liquid crystal display panel. Figure 2 is the backlight spectrum of a general color saturation liquid crystal display panel. The backlight spectrum of a high color saturation liquid crystal display panel. The 4a and 4b are schematic diagrams of the front view/squint view of the liquid crystal display panel. Fig. 5 is a diagram showing the relationship between the squint color temperature and the color filter parameters in the present invention. The relationship between the squint chromatic aberration and the color filter parameters in the present invention. [Main component symbol description] Light penetration spectrum backlight spectrum squint chromatic aberration color filter thickness squint light The travel path of the color filter parameter CF〇 ⑴, CF3〇 ⑴, CF6〇 ⑴ BLn (λ) 'BLh (λ) ΔΕ d 2d
Yr、ΥΒYr, ΥΒ