201100780 六、發明說明： 【發明所屬之技術領域】 本發明係關於使用複數之攝影裝置檢査液晶顯示面板 的畫質不良的方法及裝置。 【先前技術】 檢查液晶顯示面板之畫質不良（亮度不均、亮點缺陷 0 、黑點缺陷等）的方法，由根據作業員的目視之從前的檢 查方法，改變成根據攝影裝置之自動檢查方法。利用攝影 裝置的檢査所會遭遇到的問題之一是液晶顯示面板的視角 特性的問題。TN (扭轉向列）型液晶顯示面板，利用液晶 的複折射性來進行影像顯示，所以與視線對面板爲垂直方 向的場合相比，視線傾斜於上下方向的場合，與視線傾斜 於左右方向的場合，分別會隨著其傾斜的角度而使顯示的 對比不同。考慮個人電腦用的標準液晶顯示面板時，其顯 〇 示畫面爲橫長之長方形（左右尺寸比上下尺寸更大），對 於左右方向的視線的傾斜視角特性對顯示畫面的法線爲對 稱的’對於上下方向的視線傾斜則視角特性對顯示畫面之 法線爲非對稱的。以下說明此點。 圖2係顯示直立配置的TN型液晶顯示面板10的左右 方向的視角特性之立體圖。視角是指在特定的測定條件， 可得到特定倍數以上的對比比値的視線的傾斜角範圍。改 變測定條件及對比比値的話，即使是相同的液晶顯示面板 ，視角的數値也會不同。圖2係假設中間階調的資料，顯 -5- 201100780 示可得到特定倍以上的對比比値的角度範圍。以中間階調 的資料測定視角特性的話，與以亮度1 0 0 %的資料進行測 定的場合相比，視角會變窄。以顯示畫面12的左右方向 (亦即’平行於顯示畫面的上邊及下邊的方向）爲X方向 ，以上下方向（亦即，平行於顯示畫面的左邊與右邊的方 向）爲Y方向’以平行於顯示畫面12的法線14的方向（ 亦即’垂直於顯示畫面12的方向）爲Z方向的話，在XZ 平面1 6內之視角特性係對法線〗4爲左右對稱。亦即，使 0 視線由法線1 4的方向往右傾斜時可得到特定倍數以上的 對比比値的最大傾斜角爲φ 1，而往左傾斜時得到特定倍 數以上的對比比値的最大傾斜角φ 2爲實質相等。 相對於此’上下方向的視角特性爲非對稱的。圖3係 與圖2同樣之立體圖，顯示上下方向之視角特性。在γζ 平面1 8內之視角特性對法線1 4是上下非對稱的。亦即， 使視線由法線1 4的方向往上傾斜時可得到特定倍數以上 的對比比値的最大傾斜角爲φ 3，與往下傾斜時得到特定 《 倍數以上的對比比値的最大傾斜角φ 4是不同的。個人電 腦用之TN型液晶顯示面板的場合，係被製作成φ 3較大 而Φ 4較小。201100780 VI. Description of the Invention: [Technical Field] The present invention relates to a method and apparatus for inspecting a picture quality of a liquid crystal display panel using a plurality of imaging devices. [Prior Art] The method of checking the poor quality of the liquid crystal display panel (brightness unevenness, bright spot defect 0, black spot defect, etc.) is changed from the previous inspection method according to the operator's visual inspection to the automatic inspection method according to the photographing device. . One of the problems encountered with the inspection of the photographic apparatus is the problem of the viewing angle characteristics of the liquid crystal display panel. The TN (twisted nematic) type liquid crystal display panel performs image display by utilizing the birefringence of the liquid crystal. Therefore, when the line of sight is inclined in the vertical direction as compared with the case where the line of sight is perpendicular to the panel, the line of sight is inclined in the left and right direction. In this case, the contrast of the display will be different depending on the angle of the tilt. When considering a standard liquid crystal display panel for a personal computer, the display screen is a horizontally long rectangle (the left and right dimensions are larger than the upper and lower dimensions), and the oblique viewing angle characteristics of the line of sight in the left and right direction are symmetric to the normal of the display screen. When the line of sight is tilted in the up and down direction, the viewing angle characteristic is asymmetric to the normal of the display screen. This is explained below. Fig. 2 is a perspective view showing the viewing angle characteristics of the TN type liquid crystal display panel 10 in an upright configuration in the left and right direction. The viewing angle refers to a range of inclination angles of a line of sight of a specific magnification of a specific multiple or more under a specific measurement condition. If the measurement conditions and contrast ratios are changed, the number of viewing angles will be different even for the same liquid crystal display panel. Fig. 2 is a data of a hypothetical intermediate tone, which shows that the angle range of the contrast ratio 特定 above a certain multiple is obtained. When the viewing angle characteristic is measured with the data of the intermediate tone, the angle of view is narrower than when the measurement is performed with a data of 100% brightness. The left and right direction of the display screen 12 (that is, the direction parallel to the upper and lower sides of the display screen) is the X direction, and the upper and lower directions (that is, the directions parallel to the left and right sides of the display screen) are in the Y direction 'parallel to When the direction of the normal 14 of the display screen 12 (that is, the direction perpendicular to the display screen 12) is the Z direction, the viewing angle characteristic in the XZ plane 16 is bilaterally symmetric with respect to the normal line 4. That is, when the 0 line of sight is tilted to the right by the direction of the normal line 14, the maximum tilt angle of the contrast ratio 値 of a specific multiple or more is φ 1, and when tilted to the left, the maximum tilt of the contrast ratio of a specific multiple or more is obtained. The angle φ 2 is substantially equal. The viewing angle characteristics in the 'up and down direction' are relatively asymmetrical. Fig. 3 is a perspective view similar to Fig. 2, showing the viewing angle characteristics in the up and down direction. The viewing angle characteristic in the γ ζ plane 18 is asymmetrically up and down with respect to the normal line 14. That is, when the line of sight is tilted upward from the direction of the normal 14 to obtain a contrast ratio of a specific multiple or more, the maximum tilt angle is φ 3, and when tilted downward, a maximum tilt of the contrast ratio of more than the multiple is obtained. The angle φ 4 is different. In the case of a TN type liquid crystal display panel for a personal computer, it is made that φ 3 is large and Φ 4 is small.
以下說明於TN型之液晶顯示面板，視角特性爲非對 稱的理由。圖4係說明TN型液晶顯示面板的視角特性之 側面圖，特別是顯示中間階調資料之視角特性。液晶顯示 面板之2枚基板20,22之間存在者液晶分子24。圖4( A )顯示於2枚基板20，22之間施加特定的電壓的狀態（ON -6- 201100780 狀態）。遠離基板2 0，2 2的液晶分子2 4 ’受到電壓的影響 ，朝向對基板幾乎垂直的方向。因與配置於基板的外側之 偏光元件之關係，在此狀態時’光線不會透過液晶顯示面 板。亦即，畫面是暗的。另一方面，圖4(C)顯示於2 枚基板2 0，2 2之間不施加電壓的狀態（〇 F F狀態）。遠離 基板20,22的液晶分子24，朝向對基板幾乎平行的方向。 但是，由一方之基板20朝向另一方之基板22，液晶分子 0 2 4的方向約被扭轉9 0度。此狀態時光線透過液晶顯示面 板，畫面明亮。此爲所謂的常白模式（normally white mode )。圖4 ( B )顯示中間階調資料的狀態。於2枚基 板20,22之間被施加中間強度的電壓。液晶分子24立起 至途中。此狀態時由垂直於顯示畫面的方向來看液晶顯示 面板時，畫面看起來是灰色的。此時，由朝上傾斜的方向 來看的話，液晶分子24幾乎爲躺下的狀態，所以畫面看 起來會比灰色更亮。相反地，由朝下傾斜的方向來看的話 〇 ’液晶分子24幾乎爲立起的狀態，所以畫面看起來會比 灰色更暗。如此般，特別是在中間階調時，非對稱的視角 特性會更被強調。 考慮使用1台攝影裝置檢査具有如前述的視角特性的 液晶顯示面板的場合。圖5 ( A )係使液晶顯示面板的顯 示畫面12與攝影裝置的攝影區域28重疊顯示之正面圖。 攝影區域28具有完全覆蓋顯示畫面12的面積。由顯示畫 面12的法線方向來看（亦即，由正面來看），攝影裝置 26的中心3 0 (亦即，攝影裝置的受光面的中心）與顯示 201100780 畫面12的中心是一致的。圖5(b)係槪略顯示以攝影裝 置26攝影之顯示畫面12的攝影資料之亮度。顯示畫面12 之所有的畫素上顯示相同的中間階調資料的場合，在上下 方向的中央附近成爲灰色的資料32,上端附近成爲比中央 附近更暗的資料34’下端附近成爲比中央附近更亮的資料 36。其理由如上述。 圖ό係由橫向所見之圖5 ( a )的狀況之側面圖。圖6 (A)係由橫向所見之攝影裝置26的攝影區域28。以對 向於液晶顯示面板10的顯示畫面的方式配置攝影裝置 26’以使液晶顯示面板10的顯示畫面12進入攝影裝置26 的攝影區域28內的方式，設定液晶顯示面板10與攝影裝 置26之距離。如圖6(B)所示，連結顯示畫面12的上 端與攝影裝置26的中心3 0的線段3 8 (相當於視線）對顯 示畫面12的法線14僅傾斜角度θ丨。此角度01比圖3之 下側的最大傾斜角Φ 4還要大時，變得無法得到特定的對 比比値’例如於顯示畫面中有亮點缺陷，也很難以攝影裝 置區分該缺陷。另一方面，於圖6(B)，連結顯示畫面 12的下端與攝影裝置26的中心30的線段40對顯示畫面 12的法線14僅傾斜角度Θ 2。此角度Θ 2比圖3的上側之 最大傾斜角度Φ 3更大的話，變得無法得到特定的對比比 値。T N型液晶顯示面板的場合，φ 4比φ 3更小，所以在 顯示畫面的上端附近變得無法得到特定的對比比値，在上 端附近會由無法順利進行畫質檢査之虞。接著，液晶顯示 面板的尺寸越大，起因於視角特性的檢查不良的影響就越 -8- 201100780 大。 作爲解消起因於這樣的視角特性的檢査不良的方法’ 已知有增加攝影裝置的數目的方法。記載於日本特開 2000-81368號公報（專利文獻1)的液晶顯示面板檢查方 法，係將液晶顯示面板的顯示畫面分割爲複數個區域’於 各該區域以不同個之攝影裝置進行攝影，以減少視角特性 的影響。具體而言，將液晶顯示面板的顯示畫面分割爲4 0 個區域，使用4台攝影機攝影分別的區域。此外，記載於 特開平7-27714號公報（專利文獻2)的顯示面板檢查裝 置，也將液晶顯示面板的顯示畫面分割爲4個區域，使用 4台攝影機攝影分別的區域。 〔先前技術文獻〕 〔專利文獻〕 〔專利文獻1〕日本專利特開2000 — 8 1 3 68號公報 〔專利文獻2〕日本專利特開平7 — 277 1 4號公報 〇 【發明內容】 〔發明所欲解決之課題〕 增加攝影裝置的台數的話，確實會使視角特性的影響 減少’但是增加攝影裝置的台數的話，會使檢查裝置變得 昂貴。此處’在使用複數之攝影裝置的場合，希望能有儘 可能地減少攝影裝置的台數，且儘可能地減少視角特性的 ' 影響的方法。 本發明之目的在於提供使用複數之攝影裝置檢查點亮 201100780 的液晶顯示面板的場合’儘可能地減少攝影裝置的台 且儘可能地減少視角特性的影響之檢查方法及裝置。 〔供解決課題之手段〕 本發明之檢查方法之作爲查對象的液晶顯不面 係具有矩形的顯示畫面者，把分別平行於接於該矩形 爲直角的兩個邊的方向作爲X方向及γ方向而平行 示畫面的法線的方向爲z方向的場合’於xz平面內 角特性對前述法線爲對稱的而於γζ平面內的視角特 前述法線爲非對稱。接著，本發明之檢查方法，係點 晶顯示面板，使用複數之攝影裝置攝影其顯示畫面者 示畫面被分割爲與攝影裝置的台數相同數目的部分區 以這些之部分區域與複數之攝影裝置爲1對1對應的 以攝影裝置攝影部分區域。在本發明具有特徵者爲沿 述γ方向排列的攝影裝置的台數，比沿著X方向排 攝影裝置的台數更多。例如，沿著Υ方向排列的攝影 的台數爲2台，而沿著X方向排列之攝影裝置的台數 台。或者是，沿著Υ方向排列的攝影裝置的台數爲3 而沿著X方向排列之攝影裝置的台數爲2台。 針對所有的攝影裝置，可以使連結前述部分區域 心及與其對應的攝影裝置的中心之線段對前述法線爲 。或者是，針對至少一攝影裝置，可以使連結前述部 域的中心及與其對應的攝影裝置的中心之線段於前述 平面內對前述法線傾斜往視角特性良好的方向。這樣 數， 板， 之互 於顯 的視 性對 見液 。顯 域， 方式 著前 列之 裝置 爲1 台， 的中 平行 分區 ；ΥΖ 使其 -10- 201100780 傾斜的場合，由前述法線方向來看，可以使至少一攝影裝 置的中心來到平行於顯示畫面的X方向之一個邊之上。此 外，對前述法線之前述線段的傾斜角可以在2〜10度的範 圍內。 本發明之檢査裝置，係以與前述檢查方法之發明同樣 以液晶顯示面板爲檢查對象。而且爲了攝影點亮的液晶顯 示面板的顯示畫面而具備複數之攝影裝置。此檢查裝置之 0 特徵之一，係沿著前述Y方向排列的攝影裝置的台數，比 沿著X方向排列之攝影裝置的台數更多。攝影裝置可以移 動於前述Y方向。 . 〔發明之效果〕 根據本發明的話，在使用複數之攝影裝置的場合，考 慮液晶顯示面板之特性之非對稱性，藉由特定出排列較多 攝影裝置的方向，可以使用儘可能少的數目之攝影裝置， Q 以視角特性的影響很少的狀態檢查液晶顯示面板的畫質不 良。 【實施方式】 圖1係顯示本發明的檢查方法之攝影機的配置狀態之 第1實施例之立體圖。矩形之液晶顯示面板10爲TN型， 在假設使用者的使用狀態之直立狀態（配置爲橫長而使用 的狀態），在點亮狀態下具有圖2與圖3所示之視角特性 。亦即，對於左右方向之視線的傾斜視角特性係對顯示畫 -11 - 201100780 面1 2的法線爲對稱的，對於上下方向之視線的傾斜 特性係對顯示畫面〗2的法線爲非對稱的。以顯示畫^ 的左右方向（亦即，平行於顯示畫面的上邊62及下； 的方向）爲X方向，以上下方向（亦即，平行於顯示 的左邊66與右邊68的方向）爲γ方向，以平行於顯 面12的法線14的方向（亦即，垂直於顯示畫面12 向）爲Z方向的話，在χζ平面內之視角特性係對顯 面Ϊ 2的法線爲左右對稱，在YZ平面內之視角特性係 示畫面12的法線爲上下非對稱。上邊62及下邊64、 邊66及右邊68係相互以直角相接的。 以對向於液晶顯示面板10的顯示畫面12的方式 2台攝影機40,42。這些攝影機相當於本發明之攝影 ’具體而言係CCD攝影機。第1攝影機40與第2攝 42在γ方向上隔著間隔被配置。第1攝影機40的攝 域44係以相當充裕的方式覆蓋住顯示畫面1 2的上半 第2攝影機42的攝影區域46係以相當充裕的方式覆 顯示畫面12的下半部。 圖7係於圖1之立體圖加上XZ平面與YZ平面 ° 2台攝影機40,42的中心存在於同一之YZ平面18 亦即，視角特性非對稱的平面內）。另一方面’ 2台 機40,42的中心不存在於同一個xz平面16內。 圖8爲圖1之配置狀態的正面圖。由正面看，第 影機40的中心41位於顯示畫面1 2的上部區域的中 。第2攝影機42的中心43位於顯示畫面12的下部 視角 a 12 I 64 畫面 不畫 的方 不畫 對顯 與左 配置 裝置 影機 影區 部。 蓋住 之圖 內（ 攝影 1攝 心上 區域 -12- 201100780 的中心上。第1攝影機40的攝影區域44係以相當 方式覆蓋住顯示畫面12的上部區域。第2攝影機 影區域46係以相當充裕的方式覆蓋住顯示畫面12 區域。2台攝影機40,42係沿著視角特性非對稱的 亦即沿著Y方向隔著間隔而配置的。視角特性爲釣 向，亦即X方向上，攝影機的台數只有1台。如此 著Y方向排列的攝影裝置的台數（在此實施例爲2 0 沿著X方向排列之攝影裝置的台數（在此實施例爲 更多是本發明的特徵。藉此，可儘可能地減少攝影 數，且可防止起因於視角特性的檢查不良。 圖9爲圖1之配置狀態的側面圖。圖9(A) 向來看2台攝影機40,42的攝影區域44,46。圖9 顯示2台攝影機40,42的視線的最大角度。於圖9 對液晶顯示面板1 〇的顯示畫面1 2之上部區域（上 區域）的攝影是由第1攝影機40負責。顯示畫面 〇 度（上下方向的尺寸）爲Η的話，上部區域的中 位於顯示畫面1 2的上端起算H/4的位置。於此中/丨 顯示畫面12立起法線的話，第1攝影機40的中心 光面的中心）位於該法線上。連結上部區域的上端 攝影機4 〇的中心4 1的線段5 0對顯示畫面1 2的法 斜角度Θ1。與攝影機1台的場合（先前技術）之G )的角度Θ1相比，圖9(B)之角度θι變小。亦 角度θ1變得比圖3的上側之最大傾斜角度φ 3更小 部區域的上端附近，也可以確保特定的對比比値。 ’充裕的 42的攝 的下部 f方向， ’稱的方 ，般，沿 台）比 1台） 機的台 係由橫 (B )係 (B )針 半部的 12的高 丨、48係 > 48對 41 (受 與第1 線僅傾 圓6 ( B 即，此 ，於上 另一方 -13 - 201100780 面，連結上部區域的下端（顯示畫面12的上下方向的中 點）與第1攝影機4 0的中心41的線段5 2對顯示畫面12 的法線僅傾斜角度Θ2。對於此側的角度Θ2因爲是在視角 特性良好之側，所以對比比値可充分確保。此外’對於顯 示畫面12的左右方向之視角特性，如圖2所示，即使視 線在左右方向上相當傾斜也確保了充分的對比比値，所以 即使在顯示畫面的右端及左端’也不會產生檢查不良。 於圖9(B)針對液晶顯示面板1〇的顯示畫面12之 下部區域（下半部的區域）的攝影是由第2攝影機42負 責。下部區域的中心54位於由顯示畫面12的下端起算 Η/4的位置。於此中心54對顯示畫面1 2立起法線的話， 第2攝影機4 2的中心4 3 (受光面的中心）位於該法線上 。對於第2攝影機42之角度Θ3及Θ4係與第1攝影機4〇 的角度θ 1及Θ2相同。亦即，針對下部區域也可不受到視 角特性影響地，進行根據第2攝影機42的檢査。如此般 ，藉由沿著視角特性非對稱的方向排列2台攝影機4〇,42 可以解消起因於視角特性的檢查不良。 圖10係針對本發明的檢查方法之第2實施例之與圖9 同樣的側面圖。圖1 〇 ( A )對應於圖9 ( A )，圖1 0 ( Β ) 對應於圖9(B) 。2台攝影機4 0，42與圖9相比，對於顯 示畫面12僅於上方移位距離S而已。在此實施例距離S 爲顯示畫面12的高度Η的8分之一（亦即，12.5%)。 連結顯示畫面12的上部區域的中心48與第1攝影機40 的中心41的線段5 6對顯示畫面1 2的法線僅往上方傾斜 -14- 201100780 角度αΐ。亦即，線段56傾斜往視角特性良好的方向。如 圖3所示’視線往上方傾斜的方向，是視角特性良好的方 向。該傾斜角α1係由移位量S、與從顯示畫面12至第1 攝影機40的受光面爲止的距離D所決定的。例如，顯示 畫面12的高度η爲280mm的話，移位量s爲其8分之― 之3 5mm。距離D例如爲i〇〇〇mm。此場合，傾斜角αΐ約 爲2度。 0 連結顯示畫面12的上部區域的上端與第1攝影機40 的中心41的線段50對顯示畫面12的法線僅傾斜角度Θ1 。此角度Θ1比圖9 (Β)之Θ1更小約2度。藉此，與圖9 (Β )相比，可以使在上端附近之視角特性的影響更少。 另一方面，連結上部區域的下端（顯示畫面12的上下方 向的中點）與第1攝影機40的中心41的線段52對顯示 畫面1 2的法線僅傾斜角度Θ2，此側的角度Θ2比圖9 ( Β )之Θ2更大約2度。對於由上方所見之側的角度Θ2’因 Q 爲是在視角特性良好之側’所以即使Θ 2增加對比比値可 充分確保。 顯示畫面12的下部區域的攝影狀況也與上部區域相 同。連結顯示畫面12的下部區域的中心54與第2攝影機 4 2的中心4 3的線段5 8對顯示畫面1 2的法線僅往上方傾 斜角度α2。α2等於αΐ。角度Θ3等於Θ1，角度Θ4等於Θ2 〇 • 圖11爲圖10之配置狀態的正面圖。與圖8相比’對 顯示畫面12，2台攝影機40,42的攝影區域44,46作爲全 -15- 201100780 體往上方移位Η/S。與圖8相比，顯示畫面12的上部區域 ，藉由攝影區域44的比較下側的部分來攝影。同樣地’ 顯示畫面12的下部區域，藉由攝影區域46的比較下側的 部分來攝影。 圖12係針對本發明的檢查方法之第3實施例之與圖9 同樣的側面圖。2台攝影機40,42與圖9相比，對於顯示 畫面12僅於上方移位距離S而已。在此第3實施例S爲 顯示畫面12的高度Η的4分之一（亦即，25%)比圖1〇 的第2實施例移位量更大。由正面看，第1攝影機40的 中心41重疊於顯示畫面12的上端。連結顯示畫面12的 上部區域的中心4 8與第1攝影機4 0的中心41的線段5 6 對顯示畫面1 2的法線僅往上方傾斜角度α 1。圖1 2之傾斜 角αΐ爲圖10之傾斜角αΐ的約2倍，例如約爲4度。 連結顯示畫面12的上部區域的上端與第1攝影機40 的中心41的線段50，與顯示畫面12的法線平行。亦即角 度Θ1爲0度。藉此，與圖10(B)相比，可以使在上端 附近之視角特性的影響更少。另一方面，連結上部區域的 下端（顯示畫面12的上下方向的中點）與第1攝影機40 的中心41的線段5 2對顯示畫面1 2的法線僅傾斜角度Θ2 ，此側的角度Θ2比圖10(B)之Θ2又更大約2度。對於 由上方所見之側的角度Θ 2，因爲是在視角特性良好之側， 所以即使Θ2增加對比比値可充分確保。第1攝影機40的 中心41與顯示畫面12的上端（上邊）一致，所以顯示晝 面的上部區域之全部畫素，成爲由正面方向或傾斜於上方 -16- 201100780 的方向來攝影。藉此，變成不會由傾斜於下方的方向來攝 影，可以避免由視角特性差的方向來攝影。 顯示畫面12的下部區域的攝影狀況也與上部區域相 同。連結顯示畫面1 2的下部區域的中心54與第2攝影機 42的中心43的線段58對顯示畫面1 2的法線僅往上方傾 斜角度α2。α2等於αΐ。角度Θ3爲0度，角度Θ4等於Θ2 〇 0 圖13爲圖12之配置狀態的正面圖。與圖8相比，對 顯示畫面12，2台攝影機40,42的攝影區域44,46作爲全 體往上方移位Η/4。與圖8相比，顯示畫面12的上部區域 ，藉由攝影區域44大約下半部來攝影。同樣地，顯示畫 面12的下部區域，藉由攝影區域46的下半部來攝影。於 圖13，由正面看，可知第1攝影機40的中心41與顯示畫 面12的上端（上邊）一致。第2攝影機42的中心43與 顯示畫面12的中心一致。 Q 圖10所示之角度al，ct2之較佳的數値，依存於圖3 所示之視角特性的非對稱性。即使同樣的液晶顯示面板’ 隨著使用於檢查的中間階調資料的亮度不同視角特性也會 不同，所以角度α 1 ,α2之較佳的數値，會隨著液晶顯示面 板與其檢查條件而有所不同。一般的ΤΝ型液晶顯示面板 的場合，角度α1,α2爲2〜10度的範圍內較佳。在圖10 之實施例’ α1=α2=約2度’在圖12之實施例’ α1=α2 =約4度。 圖1 4係顯示液晶顯示面板的顯示畫面的攝影分割方 -17- 201100780 法之說明圖。圖14(A)顯示使用複數攝影機的場合之從 前的分割方法。在以前的方法，攝影機比1台更多的場合 ，係由1台增加至4台。此點係如前述專利文獻1及專利 文獻2所記載的。將顯示畫面分割爲4個部分區域R1， R2，R3 ’ R4，分別以不同的攝影機進行攝影。在X方向 與Y方向將顯示畫面進行2分割，而使攝影機增爲複數台 的場合下最小台數成爲4台。相對於此，在本發明，如圖 14 ( B )所示，僅在視角特性非對稱的方向（Y方向，亦 即上下方向）進行2分割，成爲R1與R2兩個部分區域。 在視角特性對稱的方向（X方向，亦即左右方向）則不分 割。如此一來，攝影機的台數2台就夠了。因爲只有在視 角特性非對稱的方向上會有檢查不良的問題，所以只在該 方向增加攝影機的台數，就可以解消檢查不良的問題。圖 1 4 ( C )係於從前的方法，比4台更多地進而增加攝影機 台數的情形。在此場合，使液晶顯示面板在上下方向及左 右方向都進行3分割，所以被分割爲9個部分區域R1〜 R9 ’而攝影機的台數成爲9台。相對於此，在本發明，攝 影機台數比圖1 4 ( B )更爲增加時，係如圖1 4 ( D )所示 ’在Y方向進行3分割，使Y方向的攝影機台數成爲3 台。X方向的攝影機台數，只要比Y方向的攝影機台數更 少就可以，可以是1台或2台。在圖14(B)使X方向之 攝影機台數爲2台，部分區域成爲R1〜R6之6個，攝影 機6台就夠用。 於圖1，2台攝影機40,42可以移動於Y方向，亦即 -18- 201100780 箭頭60所示之方向。藉由使攝影機移動於γ方向’可以 改變圖10(B)之角度α1,α2。αΐ與α2可以爲互異的角度 。進而，改變進行檢查的液晶顯示面板的尺寸時’有必要 配合該尺寸而改變攝影機40,42的位置，藉由使攝影機 4 0,42移動於Υ方向，可以進行那樣的位置變更。 於圖1，2台攝影機40，42亦可以移動於Ζ方向，亦 即箭頭61所示之方向。藉由使攝影機移動於Ζ方向，可 0 以配合液晶顯示面板的大小，改變液晶顯示面板與攝影機 之距離。亦即，在液晶顯示面板很大的場合，可使液晶顯 示面板與攝影機之距離遠離，相反的，在液晶顯示面板很 小的場合，可使液晶顯示面板與攝影機之距離拉近。藉此 ，可不管面板的大小，而使根據攝影機之攝影分解能保持 一定。 圖1 5顯示將顯示畫面進行2分割之其他方法（比較 例）。在此場合，對於橫長的顯示畫面1 2，將2台攝影機 〇 40,42排列於X方向上。接著，以使分別的攝影機的攝影 區域4夂46 (假設爲長方形）成爲縱長的方式改變2台攝 影機的姿勢。如此一來，對於長方形的顯示畫面12可以 儘可能不浪費攝影區域的方式來配置2台攝影機40,42。 與本發明的實施例之圖1 1比較的話，圖1 5之比較例，不 浪費W影區域44,46所以從攝影影像分解能的觀點來看是 有效率的。然而’在圖1 5的比較例，起因於視角特性的 ' 非對稱性之檢查不良的問題仍然是未被改善。而且，這樣 的攝影機配置，即使可以減少到比4台更少的攝影機台數 -19 - 201100780 但是無法得到本發明的效果。 【圖式簡單說明】 圖1係顯示本發明的檢査方法之攝影機的配置狀態之 第1實施例之立體圖。 圖2係顯示直立配置的TN型液晶顯示面板10的左右 方向的視角特性之立體圖。 圖3係顯示上下方向之視角特性之與圖2同樣之立體 圖。 圖4係說明TN型液晶顯示面板的視角特性之側面圖 ，特別是顯示中間階調資料之視角特性。 圖5係以1台攝影裝置攝影液晶面板的狀況之正面圖 〇 圖6係由橫向所見之圖5 ( A )的狀況之側面圖。 圖7係於圖1之立體圖加上XZ平面與YZ平面之圖 〇 圖8爲圖1之配置狀態的正面圖。 圖9爲圖1之配置狀態的側面圖。 圖1 〇係針對本發明的檢查方法之第2實施例之與圖9 同樣的側面圖。 圖11爲圖10之配置狀態的正面圖。 圖1 2係針對本發明的檢查方法之第3實施例之與圖9 同樣的側面圖。 圖13爲圖12之配置狀態的正面圖。 -20- 201100780 圖1 4係顯示液晶顯示面板的顯示畫面的攝影分割方 法之說明圖。 圖1 5係將顯示畫面2分割之其他方法（比較例）之 正面圖。 【主要元件符號說明】 1 〇 :液晶顯不面板 12 :顯不畫面 1 4 :法線 1 6 : XZ平面 1 8 : YZ平面 20,22 ：基板 24 :液晶分子 26 :攝影裝置 2 8 :攝影區域 Q 3 0 :攝影裝置的中心 3 2 :灰色資料 3 4 :暗的資料 3 6 :亮的資料 3 8 :線段 40 :第1攝影機 41 :第1攝影機的中心 _ 42 :第2攝影機 43 :第2攝影機的中心 -21 - 201100780 44:第1攝影機的攝影區域 46:第2攝影機的攝影區域 48 :上部區域的中心 5〇:連結上部區域的上端與第1攝影機的中心之線段 52:連結上部區域的下端與第1攝影機的中心之線段 54 :下部區域的中心 56:連結上部區域的中心與第1攝影機的中心之線段 5 8 :連結下部區域的中心與第2攝影機的中心之線段 6〇:攝影機之往Y方向的移動 61 :攝影機之往Z方向的移動 62 :上邊 64 :下邊 66 :左邊 68 :右邊 -22-The reason why the viewing angle characteristic is asymmetrical in the TN type liquid crystal display panel will be described below. Fig. 4 is a side view showing the viewing angle characteristics of the TN type liquid crystal display panel, particularly showing the viewing angle characteristics of the intermediate tone data. Liquid crystal molecules 24 are present between the two substrates 20, 22 of the liquid crystal display panel. Fig. 4(A) shows a state in which a specific voltage is applied between the two substrates 20 and 22 (ON -6-201100780 state). The liquid crystal molecules 2 4 ' away from the substrate 20, 2 2 are affected by the voltage, and are oriented in a direction substantially perpendicular to the substrate. Due to the relationship with the polarizing element disposed on the outer side of the substrate, light does not pass through the liquid crystal display panel in this state. That is, the picture is dark. On the other hand, Fig. 4(C) shows a state in which no voltage is applied between the two substrates 20 and 22 (〇 F F state). The liquid crystal molecules 24 away from the substrates 20, 22 are oriented in a direction substantially parallel to the substrate. However, from the substrate 20 of one of the substrates 20 toward the other substrate 22, the direction of the liquid crystal molecules 0 24 is about 90 degrees. In this state, light passes through the LCD panel and the picture is bright. This is the so-called normally white mode. Figure 4 (B) shows the state of the intermediate tone data. An intermediate strength voltage is applied between the two substrates 20, 22. The liquid crystal molecules 24 stand up to the middle. In this state, when the LCD panel is viewed from the direction perpendicular to the display screen, the screen looks gray. At this time, when viewed from the direction in which the upward direction is inclined, the liquid crystal molecules 24 are almost in a lying state, so that the screen looks brighter than the gray. Conversely, when viewed from the downward direction, the liquid crystal molecules 24 are almost in an upright state, so the picture looks darker than gray. In this way, especially in the middle tone, the asymmetric viewing angle characteristics are more emphasized. A case where a liquid crystal display panel having the viewing angle characteristics as described above is inspected using one photographing device is considered. Fig. 5 (A) is a front view showing the display screen 12 of the liquid crystal display panel superimposed on the imaging area 28 of the imaging device. The photographing area 28 has an area that completely covers the display screen 12. Viewed from the normal direction of the display screen 12 (i.e., viewed from the front), the center 30 of the photographing device 26 (i.e., the center of the light receiving surface of the photographing device) coincides with the center of the display 201100780 screen 12. Fig. 5(b) schematically shows the brightness of the photographic data on the display screen 12 photographed by the photographing device 26. When the same intermediate tone data is displayed on all the pixels of the display screen 12, the data 32 becomes gray near the center in the vertical direction, and the vicinity of the upper end is darker than the vicinity of the center. Bright material 36. The reason is as described above. Figure 侧面 is a side view of the condition of Figure 5 (a) seen horizontally. Fig. 6(A) shows the photographing area 28 of the photographing device 26 seen in the lateral direction. The imaging device 26 ′ is disposed so as to face the display screen of the liquid crystal display panel 10 such that the display screen 12 of the liquid crystal display panel 10 enters the imaging region 28 of the imaging device 26 , and the liquid crystal display panel 10 and the imaging device 26 are set. distance. As shown in Fig. 6(B), the line segment 38 (corresponding to the line of sight) connecting the upper end of the display screen 12 and the center 30 of the photographing device 26 is inclined by an angle θ 对 with respect to the normal 14 of the display screen 12. When the angle 01 is larger than the maximum inclination angle Φ 4 on the lower side of Fig. 3, it becomes impossible to obtain a specific contrast ratio 値', for example, there is a bright spot defect in the display screen, and it is difficult to distinguish the defect by the photographing device. On the other hand, in Fig. 6(B), the line segment 40 connecting the lower end of the display screen 12 and the center 30 of the photographing device 26 is inclined at an angle Θ 2 to the normal 14 of the display screen 12. If the angle Θ 2 is larger than the maximum inclination angle Φ 3 of the upper side of Fig. 3, it becomes impossible to obtain a specific contrast ratio 値. In the case of the T N type liquid crystal display panel, since φ 4 is smaller than φ 3 , a specific contrast ratio 变得 is not obtained in the vicinity of the upper end of the display screen, and the image quality inspection cannot be performed smoothly in the vicinity of the upper end. Then, the larger the size of the liquid crystal display panel, the greater the effect of the inspection failure due to the viewing angle characteristics is -8-201100780. As a method of canceling the inspection failure due to such viewing angle characteristics, a method of increasing the number of photographing apparatuses is known. In the liquid crystal display panel inspection method of the Japanese Patent Publication No. 2000-81368 (Patent Document 1), the display screen of the liquid crystal display panel is divided into a plurality of regions, and each of the regions is photographed by a different imaging device. Reduce the impact of viewing angle characteristics. Specifically, the display screen of the liquid crystal display panel is divided into 40 areas, and the respective areas are photographed using four cameras. In addition, the display panel inspection device of the liquid crystal display panel divides the display screen of the liquid crystal display panel into four regions, and photographs the respective regions using four cameras. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-A No. Hei. No. Hei. Problem to be solved] When the number of imaging devices is increased, the influence of the viewing angle characteristics is surely reduced. However, if the number of imaging devices is increased, the inspection device becomes expensive. Here, when a plurality of photographing apparatuses are used, it is desirable to reduce the number of photographing apparatuses as much as possible and to reduce the influence of the viewing angle characteristics as much as possible. SUMMARY OF THE INVENTION An object of the present invention is to provide an inspection method and apparatus for reducing the influence of viewing angle characteristics as much as possible when the liquid crystal display panel of the 201100780 is inspected by a plurality of photographing apparatuses. [Means for Solving the Problem] The liquid crystal display surface to be inspected by the inspection method of the present invention has a rectangular display screen, and the directions parallel to the two sides which are perpendicular to the rectangle are taken as the X direction and γ. In the case where the direction of the normal to the direction parallel to the screen is the z direction, the angular characteristics in the xz plane are symmetrical with respect to the normal line, and the angle of view in the γ ζ plane is asymmetrical. Next, the inspection method of the present invention is a dot crystal display panel, and a plurality of photographing devices are used to photograph the display screen, and the screen is divided into the same number of partial regions as the number of photographing devices, and the partial regions and the plurality of photographing devices. A partial area of the photographing device corresponding to the one-to-one correspondence. In the present invention, the number of photographing apparatuses arranged in the γ direction is more than the number of photographing apparatuses along the X direction. For example, the number of photographing devices arranged in the x direction is two, and the number of photographing devices arranged in the X direction is a plurality. Alternatively, the number of photographing apparatuses arranged along the x-direction is 3, and the number of photographing apparatuses arranged along the X direction is two. For all the photographing apparatuses, the line segment connecting the center of the partial region and the center of the photographing device corresponding thereto can be made to the normal line. Alternatively, for at least one of the imaging devices, the line connecting the center of the region and the center of the imaging device corresponding thereto may be inclined in the plane in the plane in which the viewing angle characteristic is good. In this way, the plates, which are visible to each other, are visible to each other. In the case of the explicit field, the device in the front row is one, and the parallel partition is in the middle; when the -10-201100780 is tilted, the center of at least one camera can be made parallel to the display screen. Above one side of the X direction. Further, the inclination angle of the aforementioned line segment of the aforementioned normal may be in the range of 2 to 10 degrees. In the inspection apparatus of the present invention, the liquid crystal display panel is inspected in the same manner as the invention of the above-described inspection method. Further, a plurality of imaging devices are provided for displaying a display screen of the liquid crystal display panel that is illuminated. One of the zero characteristics of the inspection apparatus is that the number of photographing apparatuses arranged along the Y direction is larger than the number of photographing apparatuses arranged along the X direction. The photographing device can be moved in the aforementioned Y direction. [Effects of the Invention] According to the present invention, in the case of using a plurality of imaging devices, considering the asymmetry of the characteristics of the liquid crystal display panel, it is possible to use as few numbers as possible by specifying the direction in which a plurality of imaging devices are arranged. The photographing device Q checks the image quality of the liquid crystal display panel in a state in which the influence of the viewing angle characteristics is small. [Embodiment] FIG. 1 is a perspective view showing a first embodiment of an arrangement state of a camera of the inspection method of the present invention. The rectangular liquid crystal display panel 10 is of the TN type, and assumes the viewing angle characteristics shown in Figs. 2 and 3 in the lighting state in the upright state (the state in which the user is used in the horizontal position). That is, the oblique viewing angle characteristic for the line of sight in the left and right direction is symmetrical with respect to the normal of the display -11 - 201100780 plane 1 2, and the inclination characteristic of the line of sight for the up and down direction is asymmetric to the normal of the display picture 〖2 of. The left and right direction of the display ^ (that is, the direction parallel to the upper side 62 and the lower side of the display screen) is the X direction, and the upper and lower directions (that is, the directions parallel to the left side 66 and the right side 68 of the display) are the γ direction. When the direction parallel to the normal 14 of the display 12 (that is, perpendicular to the display screen 12 direction) is the Z direction, the viewing angle characteristic in the pupil plane is bilaterally symmetric with respect to the normal of the plane Ϊ 2 . The viewing angle characteristics in the YZ plane indicate that the normal to the picture 12 is asymmetrical. The upper side 62 and the lower side 64, the side 66 and the right side 68 are connected at right angles to each other. Two cameras 40, 42 are opposed to the display screen 12 of the liquid crystal display panel 10. These cameras correspond to the photography of the present invention', specifically a CCD camera. The first camera 40 and the second camera 42 are arranged at intervals in the γ direction. The field 44 of the first camera 40 covers the upper half of the display screen 1 in a relatively abundant manner. The imaging area 46 of the second camera 42 covers the lower half of the screen 12 in a relatively sufficient manner. Figure 7 is a perspective view of Figure 1 plus the XZ plane and the YZ plane. The center of the two cameras 40, 42 is present in the same YZ plane 18, i.e., in a plane where the viewing angle characteristics are asymmetric. On the other hand, the centers of the two machines 40, 42 do not exist in the same xz plane 16. Fig. 8 is a front elevational view showing the configuration of Fig. 1. Viewed from the front, the center 41 of the first camera 40 is located in the upper area of the display screen 12. The center 43 of the second camera 42 is located at the lower portion of the display screen 12. The angle of view a 12 I 64 The picture is not drawn and the left side of the camera is not shown. In the picture (1), the photographing area 44 of the first camera 40 covers the upper area of the display screen 12. The second camera shadow area 46 is equivalent. There is ample way to cover the area of the display screen 12. The two cameras 40 and 42 are arranged asymmetrically along the viewing angle, that is, along the Y direction. The viewing angle characteristic is the fishing direction, that is, the X direction, the camera The number of the photographing devices arranged in the Y direction (in this embodiment is the number of photographing devices arranged along the X direction in this embodiment (in this embodiment, more is the feature of the present invention). Thereby, the number of shots can be reduced as much as possible, and inspection defects due to viewing angle characteristics can be prevented. Fig. 9 is a side view of the arrangement state of Fig. 1. Fig. 9(A) shows the photographing of two cameras 40, 42 The area 44, 46. Fig. 9 shows the maximum angle of the line of sight of the two cameras 40, 42. The photographing of the upper portion (upper area) of the display screen 1 of the liquid crystal display panel 1 is performed by the first camera 40 in Fig. 9. Display screen width (upper and lower If the size is Η, the upper portion of the upper portion of the display screen 12 is at the position of H/4. When the normal display screen 12 is raised to the normal, the center of the center light surface of the first camera 40) Located on the normal line, the line segment 50 of the center 4 1 of the upper camera 4 〇 of the upper region is connected to the normal angle Θ1 of the display screen 1 2 . Compared with the angle Θ 1 of the case of the camera (the prior art G) The angle θι of Fig. 9(B) becomes smaller. Also, the angle θ1 becomes smaller than the upper end of the upper side of the maximum inclination angle φ 3 of Fig. 3, and a specific contrast ratio 値 can be ensured. The lower part of the F direction, the 'weighing side, the general, along the stage' is more than one). The unit of the machine is made up of the sorghum of the half (B) (B) of the needle half of the needle, 48 series > 48 pairs of 41 ( It is only rounded to the first line by 6 (B, here, on the other side -13 - 201100780, the lower end of the upper area (the midpoint of the vertical direction of the display screen 12) and the center 41 of the first camera 40 are connected. The line segment 5 2 is only inclined at an angle Θ2 to the normal of the display screen 12. The angle Θ2 for this side is because Since the angle characteristic is good, the contrast ratio can be sufficiently ensured. Further, as shown in Fig. 2, the viewing angle characteristics of the left and right directions of the display screen 12 ensure a sufficient contrast ratio even if the line of sight is relatively inclined in the left-right direction. Therefore, even in the right end and the left end of the display screen, no inspection failure occurs. In Fig. 9(B), the lower portion of the display screen 12 of the liquid crystal display panel 1 (the lower half of the area) is photographed by the second camera. 42. The center 54 of the lower area is located at the position of Η/4 from the lower end of the display screen 12. When the center 54 raises the normal to the display screen 1 2, the center 4 3 (the center of the light receiving surface) of the second camera 4 2 is located on the normal line. The angles Θ3 and Θ4 of the second camera 42 are the same as the angles θ 1 and Θ2 of the first camera 4 。. That is, the inspection by the second camera 42 can be performed for the lower region without being affected by the viewing angle characteristics. In this way, by arranging the two cameras 4A in a direction asymmetric with respect to the viewing angle characteristics, the inspection failure due to the viewing angle characteristics can be canceled. Fig. 10 is a side view similar to Fig. 9 showing a second embodiment of the inspection method of the present invention. Fig. 1 〇 (A) corresponds to Fig. 9 (A), and Fig. 10 ( Β ) corresponds to Fig. 9(B). The two cameras 40, 42 are shifted by the distance S from the display screen 12 as compared with Fig. 9 . In this embodiment, the distance S is one eighth (i.e., 12.5%) of the height 显示 of the display screen 12. The line 48 of the upper region of the connection display screen 12 and the line segment 56 of the center 41 of the first camera 40 are inclined only upward by -14-201100780 angle αΐ from the normal line of the display screen 1 2 . That is, the line segment 56 is inclined in a direction in which the viewing angle characteristics are good. As shown in Fig. 3, the direction in which the line of sight is inclined upward is a direction in which the viewing angle characteristics are good. This inclination angle α1 is determined by the shift amount S and the distance D from the display screen 12 to the light receiving surface of the first camera 40. For example, when the height η of the display screen 12 is 280 mm, the shift amount s is 3 5 mm which is 8 points. The distance D is, for example, i〇〇〇mm. In this case, the inclination angle α ΐ is about 2 degrees. The upper end of the upper region of the connection display screen 12 and the line segment 50 of the center 41 of the first camera 40 are inclined by an angle Θ1 with respect to the normal to the display screen 12. This angle Θ1 is about 2 degrees smaller than Θ1 of Fig. 9 (Β). Thereby, compared with FIG. 9 (Β), the influence of the viewing angle characteristics in the vicinity of the upper end can be made less. On the other hand, the lower end of the upper region (the midpoint of the vertical direction of the display screen 12) and the line segment 52 of the center 41 of the first camera 40 are inclined at an angle Θ2 to the normal of the display screen 12, and the angle Θ2 of this side is Figure 9 ( Β ) Θ 2 is about 2 degrees. With respect to the angle Θ2' on the side seen from above, since Q is on the side where the viewing angle characteristics are good, even if Θ 2 is increased, the contrast ratio can be sufficiently ensured. The photographing condition of the lower region of the display screen 12 is also the same as that of the upper region. The line 54 of the lower region of the connection display screen 12 and the line segment 58 of the center 43 of the second camera 42 are inclined upward by an angle α2 only with respect to the normal line of the display screen 12. 22 is equal to αΐ. The angle Θ3 is equal to Θ1, and the angle Θ4 is equal to Θ2 〇 • Fig. 11 is a front view of the configuration state of Fig. 10. Compared with Fig. 8, the image capturing areas 44, 46 of the two cameras 40, 42 are shifted upward by Η/S as the full -15-201100780 body. Compared with Fig. 8, the upper region of the display screen 12 is photographed by comparing the lower portion of the photographing region 44. Similarly, the lower region of the display screen 12 is photographed by comparing the lower portion of the photographing region 46. Fig. 12 is a side view similar to Fig. 9 showing a third embodiment of the inspection method of the present invention. The two cameras 40, 42 are shifted by only the distance S from the display screen 12 as compared with Fig. 9. Here, in the third embodiment S, one quarter (i.e., 25%) of the height Η of the display screen 12 is larger than the shift amount of the second embodiment of Fig. 1A. The center 41 of the first camera 40 is superposed on the upper end of the display screen 12 as seen from the front. The line 48 of the upper region of the connection display screen 12 and the line segment 5 of the center 41 of the first camera 40 are inclined at an angle α1 upward only to the normal of the display screen 1 2 . The tilt angle α 图 of Fig. 12 is about 2 times the tilt angle α 图 of Fig. 10, for example, about 4 degrees. The line segment 50 connecting the upper end of the upper region of the display screen 12 and the center 41 of the first camera 40 is parallel to the normal line of the display screen 12. That is, the angle Θ 1 is 0 degrees. Thereby, compared with Fig. 10(B), the influence of the viewing angle characteristics in the vicinity of the upper end can be made less. On the other hand, the lower end of the upper region (the midpoint of the vertical direction of the display screen 12) and the line segment 52 of the center 41 of the first camera 40 are inclined by only the angle Θ2 to the normal of the display screen 12, and the angle Θ2 of this side is It is about 2 degrees more than Θ2 of Fig. 10(B). Since the angle Θ 2 on the side seen from above is on the side with good viewing angle characteristics, even if Θ 2 is increased, the contrast ratio can be sufficiently ensured. Since the center 41 of the first camera 40 coincides with the upper end (upper side) of the display screen 12, all the pixels of the upper region of the face are displayed, and the pixels are photographed in the front direction or in the direction of the upper -16 - 201100780. Thereby, it is not possible to take a picture by being inclined in the downward direction, and it is possible to avoid photographing in a direction in which the viewing angle characteristics are poor. The photographing condition of the lower region of the display screen 12 is also the same as that of the upper region. The line 54 connecting the center 54 of the lower region of the display screen 1 and the center 43 of the second camera 42 is inclined upward by an angle α2 only to the normal of the display screen 1 2 . 22 is equal to αΐ. The angle Θ3 is 0 degrees, and the angle Θ4 is equal to Θ2 〇 0. Fig. 13 is a front view of the configuration state of Fig. 12. Compared with Fig. 8, on the display screen 12, the imaging areas 44, 46 of the two cameras 40, 42 are shifted upward by Η/4 as a whole. Compared with Fig. 8, the upper region of the display screen 12 is photographed by the lower half of the photographing region 44. Similarly, the lower area of the display screen 12 is photographed by the lower half of the photographing area 46. As seen from the front, it can be seen from the front that the center 41 of the first camera 40 coincides with the upper end (upper side) of the display screen 12. The center 43 of the second camera 42 coincides with the center of the display screen 12. Q The angle a, the preferred number of ct2 shown in Fig. 10 depends on the asymmetry of the viewing angle characteristics shown in Fig. 3. Even if the same liquid crystal display panel 'has different viewing angle characteristics depending on the brightness of the intermediate tone data used for inspection, the preferred number of angles α 1 , α2 will vary depending on the liquid crystal display panel and its inspection conditions. Different. In the case of a general sputum type liquid crystal display panel, the angles α1 and α2 are preferably in the range of 2 to 10 degrees. In the embodiment of Fig. 10, 'α1 = α2 = about 2 degrees'. In the embodiment of Fig. 12, α1 = α2 = about 4 degrees. Fig. 1 is a diagram showing the photographic division of the display screen of the liquid crystal display panel -17-201100780. Fig. 14(A) shows the previous division method in the case of using a multi-camera. In the previous method, the number of cameras increased from one to four. This point is as described in the aforementioned Patent Document 1 and Patent Document 2. The display screen is divided into four partial regions R1, R2, R3' R4, which are respectively photographed by different cameras. When the display screen is divided into two in the X direction and the Y direction, and the number of the cameras is increased to a plurality of units, the minimum number of units is four. On the other hand, in the present invention, as shown in Fig. 14(B), only the direction in which the viewing angle characteristic is asymmetric (the Y direction, that is, the vertical direction) is divided into two, and the two partial regions R1 and R2 are formed. In the direction in which the viewing angle characteristics are symmetrical (the X direction, that is, the left and right direction), it is not divided. In this way, the number of cameras is enough. Since there is a problem of poor inspection in the direction in which the viewing angle characteristics are asymmetrical, the number of cameras can be increased only in this direction, and the problem of poor inspection can be solved. Figure 1 4 (C) is based on the previous method, which increases the number of cameras more than four. In this case, since the liquid crystal display panel is divided into three in the vertical direction and the left and right directions, the liquid crystal display panel is divided into nine partial regions R1 to R9', and the number of cameras is nine. On the other hand, in the present invention, when the number of cameras is increased more than that in FIG. 14(B), as shown in FIG. 14(D), 'three divisions are made in the Y direction, and the number of cameras in the Y direction is set to three. station. The number of cameras in the X direction may be smaller than the number of cameras in the Y direction, and may be one or two. In Fig. 14(B), the number of cameras in the X direction is two, and the partial area is six of R1 to R6, and six cameras are sufficient. In Fig. 1, two cameras 40, 42 can be moved in the Y direction, that is, the direction indicated by arrow -18-201100780 arrow 60. The angles α1, α2 of Fig. 10(B) can be changed by moving the camera in the γ direction. Αΐ and α2 can be mutually different angles. Further, when the size of the liquid crystal display panel to be inspected is changed, it is necessary to change the positions of the cameras 40 and 42 in accordance with the size, and such a position change can be performed by moving the cameras 40 and 42 in the x direction. In Fig. 1, the two cameras 40, 42 can also be moved in the x-direction, i.e., the direction indicated by arrow 61. By moving the camera in the Ζ direction, it is possible to change the distance between the liquid crystal display panel and the camera in accordance with the size of the liquid crystal display panel. That is, in the case where the liquid crystal display panel is large, the distance between the liquid crystal display panel and the camera can be kept away. Conversely, when the liquid crystal display panel is small, the distance between the liquid crystal display panel and the camera can be made close. Thereby, regardless of the size of the panel, the photographic decomposition according to the camera can be kept constant. Figure 15 shows another method (comparative example) of dividing the display screen into two. In this case, the two camera frames 40, 42 are arranged in the X direction on the horizontally long display screen 1 2 . Next, the postures of the two cameras are changed so that the imaging areas 4 to 46 (assuming a rectangle) of the respective cameras are vertically long. In this way, the two cameras 40, 42 can be arranged in a rectangular display screen 12 so as not to waste the photographing area as much as possible. In comparison with Fig. 11 of the embodiment of the present invention, the comparative example of Fig. 15 does not waste the W shadow areas 44, 46, so it is efficient from the viewpoint of photographic image decomposition energy. However, in the comparative example of Fig. 15, the problem of poor detection of the asymmetry due to the viewing angle characteristic is still not improved. Moreover, such a camera configuration can be reduced to a smaller number of cameras than four units -19 - 201100780, but the effect of the present invention cannot be obtained. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment of an arrangement state of a camera of the inspection method of the present invention. Fig. 2 is a perspective view showing the viewing angle characteristics of the TN type liquid crystal display panel 10 in an upright configuration in the left and right direction. Fig. 3 is a perspective view similar to Fig. 2 showing the viewing angle characteristics in the up and down direction. Fig. 4 is a side view showing the viewing angle characteristics of the TN type liquid crystal display panel, particularly showing the viewing angle characteristics of the intermediate tone data. Fig. 5 is a front view showing a state in which a liquid crystal panel is photographed by one photographing device. Fig. 6 is a side view showing the state of Fig. 5 (A) seen from the lateral direction. Figure 7 is a perspective view of the perspective view of Figure 1 plus the XZ plane and the YZ plane. Figure 8 is a front elevational view of the configuration of Figure 1. Fig. 9 is a side view showing the arrangement state of Fig. 1. Fig. 1 is a side view similar to Fig. 9 of a second embodiment of the inspection method of the present invention. Fig. 11 is a front elevational view showing the arrangement state of Fig. 10. Fig. 1 is a side view similar to Fig. 9 for a third embodiment of the inspection method of the present invention. Figure 13 is a front elevational view showing the configuration of Figure 12; -20- 201100780 Figure 1 4 is an explanatory diagram showing the method of dividing the photographing of the display screen of the liquid crystal display panel. Fig. 15 is a front view showing another method (comparative example) in which the screen 2 is divided. [Main component symbol description] 1 〇: LCD display panel 12: Display screen 1 4: Normal line 1 6 : XZ plane 1 8 : YZ plane 20, 22: Substrate 24: Liquid crystal molecule 26: Photographic device 2 8: Photography Area Q 3 0 : Center of the photographing device 3 2 : Gray data 3 4 : Dark data 3 6 : Bright material 3 8 : Line 40 : First camera 41 : Center of the first camera _ 42 : 2nd camera 43 : Center of the second camera - 201100780 44: The shooting area of the first camera 46: The shooting area of the second camera 48: The center of the upper area 5: The line connecting the upper end of the upper area and the center of the first camera 52: Link A line segment 54 of the lower end of the upper region and the center of the first camera: a center 56 of the lower region: a line segment connecting the center of the upper region and the center of the first camera 5 8 : a line segment connecting the center of the lower region and the center of the second camera 6 〇: Camera movement in the Y direction 61: Camera movement in the Z direction 62: Upper side 64: Lower side 66: Left side 68: Right side -22-