200944894 九、發明說明： ‘ 【發明所屬之技術領域】 本發明係關於一種液晶顯示裝置。 【先前技術】 由於液晶面板為一種非自發光之顯示裝置，為達到顯 示目的，需給液晶面板提供一面光源裝置以實現其顯示功 能，如背光模組，其功能在於向液晶面板提供輝度充分且 分佈均勻之平面光。目前，背光模組主要分為直下式和侧 ❿光式兩種。光源可為冷陰極螢光燈（CCFL)、發光二極體 (LED)等。由於發光二極體具有污染小、長壽命、耐震動 及抗衝擊之特點，故已廣泛應用於各種光源照明系統。 請參閱圖1，係一種先前技術之液晶顯示裝置。該液 晶顯示裝置1包括一背光模組10，該背光模組10包括一 擴散片11、一導光板12、一反射片13、一印刷電路板14 及複數發光二極體15。該擴散片11、該導光板12及該反 射片13自上而下依序相鄰設置。該複數發光二極體15以 串聯或並聯之方式設置於該印刷電路板14，該印刷電路板 14驅動該複數發光二極體15以相同之輝度發光。 該導光板12包括一出光面121、一底面122及一入光 面123。該底面122與該出光面121相對，該入光面123 與該出光面121及該底面122垂直相交。該複數發光二極 體15對應該導光板12之入光面123設置。 隨著對液晶顯示裝置顯示品質要求之不斷提昇，動態 對比度（Dynamic Contrast Ratio，DCR)技術日益走向成熟 6 200944894 •並逐漸得到廣泛地應用。簡單地說，動態對比度技術係： 當晝面灰階之平均輝度較高（畫面以亮色調為主時），則增 大背光之輝度使晝面更亮；反之，當畫面灰階之平均輝^ 較低（晝面以暗色調為主時），則減小背光之輝度使畫面更 暗。如此，可使晝面獲得更佳之對比度。 一 一惟，當液晶顯示裝置1一部份畫面灰階之平均輝度較 高，另一部份畫面灰階之平均輝度較低時，該背光模組10 無論增大還是減小輝度都只能使一部分晝面之對比度增 ❹大，另-部分畫面之對比度減小，造成該液晶顯示裝置丄 之對比度不均勻，顯示效果較差。 【發明内容】 有鑑於此，提供一種對比度較佳，顯示效果較好之液 晶顯示裝置實為必要。 一種液晶顯示裝置，其包括—導光板、複數光源帶及 一液晶面板。該導光板包括複數出光區域；該複數光源帶 ❿分別為該複數出光區域提供光；該液晶面板接受經該導光 板出射之光並顯示對應畫面。當液晶面板對應出光區域處 畫面灰階之平均輝度較高時，對應該出光區域之光源帶為 該出光區域提供輝度較高之光；當液晶面板對應出光區域 處畫面灰階之平均輝度較低時，對應該出光區域之光源帶 為該出光區域提供輝度較低之光。 相較於先前技術，本發明液晶顯示裝置之背光模組包 括一導光板及複數光源帶。該導光板包括複數出光區域且 該導光板之每一側面至少包括一入光區域。每一出光區域 7 200944894 對應一入光區域。該複數光源帶分別對應該導光板之複數 • 入光區域設置，且每一光源帶之輝度係獨立控制。當液晶 面板對應出光區域處晝面灰階之平均輝度較高時，控制對 應該出光區域之光源帶以較高之輝度發光；當液晶面板對 應出光區域處晝面灰階之平均輝度較低時，控制對應該出 光區域之光源帶以較低之輝度發光。從而可根據液晶面板 所顯示不同影像之平均輝度之高低，分別調節相應出光區 域之輝度，進而可滿足整個晝面之對比度之需要。故，該 ❹液晶顯示裝置之對比度較佳，顯示效果較好。 【實施方式】 如圖2所示，係本發明液晶顯示裝置第一實施方式之 立體分解示意圖。該液晶顯示裝置2包括一液晶面板20 及一背光模組21。該背光模組21包括一擴散片22、一導 光板23、四光源帶24及一反射片25。該擴散片22、該導 光板23及該反射片25自上而下依序相鄰層疊設置。該四 • 光源帶24分設於該導光板23之四邊緣。 ❹ 請一併參閱圖3，係圖2所示導光板23及光源帶24 之位置關係示意圖。該導光板23包括四出光區域235a、 235b、235c、235d、一底面232及四側面233。該出光區 域235與該底面232相對，該四侧面233首尾垂直相連並 分別與該出光區域235及該底面232垂直相交。每一侧面 包括一入光區域234，該入光區域234之長度為所在侧面 233長度之二分之一。每一出光區域235a、235b、235c及 235d對應一入光區域234，且每一出光區域235a、235b、 8 200944894 * 235c及235d在其對應入光區域234上之投影與該入光區 域234重合。 每一光源帶24包括一印刷電路板241及複數發光二極 體242。該複數發光二極體242設置於該印刷電路板241 上並沿該印刷電路板241之延伸方向排列。該四光源帶24 對應該四入光區域234對稱設置於該導光板23之四邊緣， 且每一光源帶24與對應之入光區域234之長度相當。另， 該四光源帶24之明滅及輝度之強弱係分別控制。 ❹ 該光源帶24之複數發光二極體242在該印刷電路板 241之驅動下以相同之輝度發光。每一光源帶24發出之光 束自與其對應之入光區域234進入該導光板23,再藉由對 應之出光區域235出射後，射向該液晶面板20。當該液晶 面板20對應該出光區域235a處晝面灰階之平均輝度較高 時，控制對應該出光區域235a之光源帶24以較高輝度發 光，從而使該導光板23之出光區域235a部份之輝度較高。 當該液晶面板20對應該出光區域235d處晝面灰階之平均 輝度較低時，控制對應該出光區域235d之光源帶24以較 低輝度發光，從而使該導光板23之出光區域235d部份之 輝度較低。進而，該液晶面板20對應該出光區域235a處 晝面之平均輝度更高，對應該出光區域235d處畫面之平均 輝度更低。因此，該液晶面板20之整體畫面之動態對比度 更佳。 相較於先前技術，本發明液晶顯示裝置2之背光模組 21之導光板23包括四出光區域235a、235b、235c、235d 9 200944894 蠢 及四側面233。每一側面233包括一入光區域234。每一入 * 光區域234對應一出光區域235。該四光源帶24分別對應 該四出光區域235a、235b、235c及235d之入光區域234 對稱設置於該導光板23之四邊緣且該四光源帶24之明滅 及輝度之強弱係分別控制。因此，當該液晶面板20對應該 導光板23之某一出光區域235所顯示晝面之平均輝度較高 或較低時，該背光模組21可控制對應該出光區域235之入 光區域234而設置之光源帶24以較高或較低之輝度發光。 © 因此，本發明液晶顯示裝置2具有較佳之動態對比度。 請參閱圖4,係本發明液晶顯示裝置第二實施方式之 部份平面俯視圖。液晶顯示裝置3與液晶顯示裝置2之主 要區別在於：背光模組31包括一導光板310及六光源帶 311。該導光板310包括二相對之第一側面312及二相對之 第二側面313。其中，每一第一側面312包括一第一入光 區域314,每一第二侧面313包括二第二入光區域315。該 義第一入光區域314位於該導光板310之第一侧面312之中 ❹ 部，且長度為該第一侧面312之長度之三分之一；每一第 二侧面313之二第二入光區域315等長，且長度均為該第 二側面313之長度之二分之一。該導光板310包括六出光 區域（未標示），每一出光區域均對應該第一入光區域314 或該第二入光區域315其中之一，該六光源帶311分別對 應該第一入光區域314或該第二入光區域315倆倆對稱設 置於該導光板310之四邊緣，且長度分別與該第一入光區 域314或該第二入光區域315相當。 200944894 相較於先前技術，本發明液晶顯示裝置3之背光模組 • 31之導光板310包括六對稱之出光區域、二第一側面312 及二第二側面313。其中每一第一侧面312包括一第一入 光區域314,每一第二側面313包括二第二入光區域315。 該六光源帶311——對應該六出光區域設置於該第一入光 區域314或該第二入光區域315之外側，且該六光源帶311 之明滅及輝度之強弱係單獨控制，從而可根據液晶面板所 顯示晝面之平均輝度之高低調節該導光板310之對應出光 〇 區域之輝度。因此，更能滿足整個顯示晝面中不同影像之 對比度之需要。 如圖5所示，係本發明液晶顯示裝置第三實施方式之 部份平面俯視圖。液晶顯示裝置4與液晶顯示裝置3之主 要區別在於：背光模組41包括一導光板410及八光源帶 411。該導光板410之每一侧面412分別包括二入光區域 413,每一入光區域413之長度為所在側面412長度之二分 I 之一。該導光板410包括八出光區域（未標示），每一出光 區域對應一入光區域413，該八光源帶411分別對應該八 出光區域之入光區域413對稱設置於該導光板410之四邊 緣，且每一光源帶411之長度與該入光區域413之長度相 當。 相較於先前技術，本發明液晶顯示裝置4之背光模組 41之導光板410包括八出光區域及八入光區域413。該八 光源帶411分別對應該複數出光區域之入光區域413對稱 設置於該導光板410之四邊緣，且每一光源帶411之明滅 11 200944894 及輝度之強弱係分別控制，從而可根據液晶面板所顯示畫 面:不同影像之對比度之需要調節該導光板410中相應出 光區域之輝度。因此，該液晶顯示裝置4之動態對比度更 佳0 准本發明不限於上述實施方式，如該導光板之相互 垂直相連之一側面之相鄰兩光源帶可連接在一起。 ’”示上所述本發明確已符合發明專利之要件，爰依法200944894 IX. Description of the invention: ‘Technical field to which the invention pertains The present invention relates to a liquid crystal display device. [Prior Art] Since the liquid crystal panel is a non-self-illuminating display device, in order to achieve the display purpose, the liquid crystal panel needs to provide a light source device to realize its display function, such as a backlight module, and its function is to provide sufficient and distributed brightness to the liquid crystal panel. Evenly flat light. At present, the backlight module is mainly divided into a direct type and a side light type. The light source may be a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), or the like. Since the light-emitting diode has the characteristics of small pollution, long life, vibration resistance and impact resistance, it has been widely used in various light source illumination systems. Please refer to FIG. 1, which is a prior art liquid crystal display device. The liquid crystal display device 1 includes a backlight module 10 including a diffusion sheet 11, a light guide plate 12, a reflection sheet 13, a printed circuit board 14, and a plurality of LEDs 15. The diffusion sheet 11, the light guide plate 12, and the reflection sheet 13 are disposed adjacent to each other in order from top to bottom. The plurality of light-emitting diodes 15 are disposed in series or in parallel on the printed circuit board 14, and the printed circuit board 14 drives the plurality of light-emitting diodes 15 to emit light with the same luminance. The light guide plate 12 includes a light emitting surface 121, a bottom surface 122, and a light incident surface 123. The bottom surface 122 faces the light-emitting surface 121, and the light-incident surface 123 intersects the light-emitting surface 121 and the bottom surface 122 perpendicularly. The plurality of light-emitting diodes 15 are disposed corresponding to the light incident surface 123 of the light guide plate 12. As the display quality requirements for liquid crystal display devices continue to increase, the Dynamic Contrast Ratio (DCR) technology is becoming more and more mature. 6 200944894 • It is gradually being widely used. Simply put, the dynamic contrast technique is: When the average luminance of the grayscale of the face is high (when the picture is dominated by bright tones), the brightness of the backlight is increased to make the face brighter; otherwise, when the gray level of the picture is average ^ Lower (when the face is dominated by dark tones), the brightness of the backlight is reduced to make the picture darker. In this way, a better contrast can be obtained for the kneading surface. However, when the average luminance of a portion of the gray scale of the liquid crystal display device 1 is high, and the average luminance of the gray scale of the other portion of the screen is low, the backlight module 10 can only increase or decrease the luminance. The contrast of a part of the kneading surface is increased, and the contrast of the other part of the picture is reduced, resulting in uneven contrast of the liquid crystal display device and poor display effect. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a liquid crystal display device having a better contrast and a better display effect. A liquid crystal display device includes a light guide plate, a plurality of light source bands, and a liquid crystal panel. The light guide plate includes a plurality of light exiting regions; the plurality of light source strips respectively provide light for the plurality of light exiting regions; and the liquid crystal panel receives the light emitted through the light guide plate and displays a corresponding picture. When the average luminance of the gray level of the screen corresponding to the light exiting area of the liquid crystal panel is high, the light source strip corresponding to the light exiting area provides light with higher brightness for the light emitting area; and when the average brightness of the gray level of the screen corresponding to the light emitting area of the liquid crystal panel is low, A light source strip corresponding to the light exiting area provides light having a lower luminance to the light exiting area. Compared with the prior art, the backlight module of the liquid crystal display device of the present invention comprises a light guide plate and a plurality of light source strips. The light guide plate includes a plurality of light exiting regions and each side of the light guide plate includes at least one light incident region. Each light exit area 7 200944894 corresponds to a light entrance area. The plurality of light source strips are respectively disposed corresponding to the plurality of light guide plates, and the brightness of each light source belt is independently controlled. When the average luminance of the gray level of the pupil surface corresponding to the light exiting area of the liquid crystal panel is high, the light source strip corresponding to the light exiting area is controlled to emit light with a higher luminance; when the average luminance of the gray level of the surface of the liquid crystal panel corresponding to the light emitting area is low, The light source strip corresponding to the light exiting area is controlled to emit light with a lower luminance. Therefore, according to the average brightness of different images displayed on the liquid crystal panel, the brightness of the corresponding light-emitting area can be adjusted separately, thereby satisfying the contrast of the entire surface. Therefore, the contrast of the liquid crystal display device is better, and the display effect is better. [Embodiment] FIG. 2 is a perspective exploded view showing a first embodiment of a liquid crystal display device of the present invention. The liquid crystal display device 2 includes a liquid crystal panel 20 and a backlight module 21. The backlight module 21 includes a diffusion sheet 22, a light guide plate 23, four light source strips 24, and a reflection sheet 25. The diffusion sheet 22, the light guide plate 23, and the reflection sheet 25 are sequentially stacked adjacent to each other from top to bottom. The four light source strips 24 are disposed on four edges of the light guide plate 23. ❹ Please refer to FIG. 3 together, which is a schematic diagram showing the positional relationship between the light guide plate 23 and the light source belt 24 shown in FIG. 2 . The light guide plate 23 includes four light exiting regions 235a, 235b, 235c, and 235d, a bottom surface 232, and four side surfaces 233. The light exiting area 235 is opposite to the bottom surface 232. The four side surfaces 233 are vertically connected end to end and perpendicularly intersect the light exiting area 235 and the bottom surface 232, respectively. Each side includes a light entrance region 234 having a length that is one-half the length of the side surface 233. Each of the light exiting regions 235a, 235b, 235c, and 235d corresponds to a light incident region 234, and a projection of each of the light exiting regions 235a, 235b, 8 200944894 * 235c and 235d on the corresponding light incident region 234 coincides with the light incident region 234 . Each of the light source strips 24 includes a printed circuit board 241 and a plurality of light emitting diodes 242. The plurality of LEDs 242 are disposed on the printed circuit board 241 and arranged along the extending direction of the printed circuit board 241. The four light source strips 24 are symmetrically disposed on the four edges of the light guide plate 23 corresponding to the four light incident regions 234, and each of the light source strips 24 is equivalent to the length of the corresponding light incident region 234. In addition, the brightness of the four light source strips 24 and the intensity of the luminance are separately controlled. The plurality of light-emitting diodes 242 of the light source strip 24 are illuminated by the printed circuit board 241 with the same brightness. The light beam emitted from each of the light source strips 24 enters the light guide plate 23 from the corresponding light incident region 234, and is emitted to the liquid crystal panel 20 through the corresponding light exiting region 235. When the average luminance of the gray level of the surface of the liquid crystal panel 20 corresponding to the light exiting region 235a is high, the light source strip 24 corresponding to the light exiting region 235a is controlled to emit light with a higher luminance, so that the light exiting region 235a of the light guiding plate 23 is partially The brightness is higher. When the average luminance of the gray level of the surface of the liquid crystal panel 20 corresponding to the light exiting region 235d is low, the light source strip 24 corresponding to the light exiting region 235d is controlled to emit light with a lower luminance, so that the light exiting region 235d of the light guiding plate 23 is partially The brightness is low. Further, the liquid crystal panel 20 has a higher average luminance corresponding to the pupil plane at the light exiting region 235a, and the average luminance of the screen corresponding to the light exiting region 235d is lower. Therefore, the dynamic contrast of the overall picture of the liquid crystal panel 20 is better. Compared with the prior art, the light guide plate 23 of the backlight module 21 of the liquid crystal display device 2 of the present invention includes four light exiting regions 235a, 235b, 235c, 235d 9 200944894 stupid and four side faces 233. Each side 233 includes a light entrance region 234. Each of the light-emitting regions 234 corresponds to a light-emitting region 235. The four light source strips 24 are symmetrically disposed on the four edges of the light guide plate 23 corresponding to the light incident regions 234 of the four light exit regions 235a, 235b, 235c, and 235d, respectively, and the brightness of the four light source strips 24 and the intensity of the luminance are separately controlled. Therefore, when the average brightness of the surface of the liquid crystal panel 20 corresponding to a light-emitting region 235 of the light guide plate 23 is higher or lower, the backlight module 21 can control the light-input region 234 corresponding to the light-emitting region 235. The light source strip 24 is provided to emit light at a higher or lower luminance. © Therefore, the liquid crystal display device 2 of the present invention has a better dynamic contrast ratio. Referring to Figure 4, there is shown a plan view of a portion of a second embodiment of a liquid crystal display device of the present invention. The main difference between the liquid crystal display device 3 and the liquid crystal display device 2 is that the backlight module 31 includes a light guide plate 310 and six light source strips 311. The light guide plate 310 includes two opposite first side faces 312 and two opposite second side faces 313. Each of the first side surfaces 312 includes a first light incident region 314, and each of the second side surfaces 313 includes two second light incident regions 315. The first light incident region 314 is located in the middle portion of the first side surface 312 of the light guide plate 310, and has a length of one third of the length of the first side surface 312; The light regions 315 are equally long and have a length that is one-half the length of the second side 313. The light guide plate 310 includes six light exiting regions (not labeled), and each of the light exiting regions corresponds to one of the first light incident region 314 or the second light incident region 315, and the six light source strips 311 respectively correspond to the first light incident layer. The region 314 or the second light incident region 315 is symmetrically disposed on the four edges of the light guide plate 310, and has a length corresponding to the first light incident region 314 or the second light incident region 315, respectively. Compared with the prior art, the light guide plate 310 of the backlight module 31 of the liquid crystal display device 3 of the present invention comprises six symmetrical light exit regions, two first side faces 312 and two second side faces 313. Each of the first side faces 312 includes a first light incident region 314, and each of the second side faces 313 includes two second light incident regions 315. The six light source strips 311 are disposed on the outer side of the first light incident region 314 or the second light incident region 315, and the brightness of the six light source strips 311 and the intensity of the brightness are separately controlled. The luminance of the corresponding exit pupil region of the light guide plate 310 is adjusted according to the average luminance of the pupil plane displayed on the liquid crystal panel. Therefore, it is more suitable for the contrast of different images in the entire display surface. Fig. 5 is a partial plan view showing a third embodiment of the liquid crystal display device of the present invention. The main difference between the liquid crystal display device 4 and the liquid crystal display device 3 is that the backlight module 41 includes a light guide plate 410 and eight light source strips 411. Each side 412 of the light guide plate 410 includes a two-into-light region 413, and each of the light-incident regions 413 has a length that is one-half of the length of the side surface 412. The light guide plate 410 includes eight light exiting regions (not shown), and each light exiting region corresponds to a light incident region 413. The eight light source strips 411 are symmetrically disposed on the four edges of the light guide plate 410 corresponding to the light incident regions 413 of the eight light exit regions. And the length of each light source strip 411 is equivalent to the length of the light incident region 413. Compared with the prior art, the light guide plate 410 of the backlight module 41 of the liquid crystal display device 4 of the present invention includes eight light exiting regions and eight light incident regions 413. The eight light source strips 411 are symmetrically disposed on the four edges of the light guide plate 410 corresponding to the plurality of light exit regions, and each of the light source strips 411 is separately controlled, and the intensity of the luminance is separately controlled, so that the liquid crystal panel can be controlled according to the liquid crystal panel. The displayed picture: the contrast of different images needs to adjust the brightness of the corresponding light-emitting area in the light guide plate 410. Therefore, the dynamic contrast ratio of the liquid crystal display device 4 is better. The present invention is not limited to the above embodiment, and the adjacent two light source strips on one side of the light guide plate which are vertically connected to each other can be connected. The invention described above has indeed met the requirements of the invention patent,
Ο =出專射請:惟，以上料輕為本發蚊㈣實施方 2ί發明之範圍並不以上述實施方式為限，舉凡熟悉本 ^ 之人士援依本發明之精神所作之等效修飾或變化， 白應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 先前技術液晶顯示裝置之立體分解示意圖。 ^。係本發明液晶顯示裝置第—實施方式之立體分解示意 f圖2所示導光板與光源帶之位置關係示意圖。 圓4係本發明液晶顯示裝 圖 圖。 施方式之部份平面俯視 施方式之部份平面俯視 圖5係本發明液晶顯示裂置第二實 圖。 12 200944894Ο 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 出 惟 惟 惟 惟 惟 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Changes, white shall be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS A perspective exploded view of a prior art liquid crystal display device. ^. A perspective exploded view of a first embodiment of a liquid crystal display device of the present invention. FIG. 2 is a schematic view showing a positional relationship between a light guide plate and a light source strip. The circle 4 is a schematic view of the liquid crystal display of the present invention. Partial plan view of a portion of the plan view is a plan view of the liquid crystal display of the present invention. 12 200944894
【主要元件符號說明】 液晶顯示裝置 2、3、4 入光區域 234 、 420 液晶面板 20 出光區域 235a > 235b 235c ' 235d 背光模組 21 、 31 、 41 印刷電路板 241 擴散片 22 發光二極體 242 導光板 23、310、 410 第一侧面 312 光源帶 24 、 311 、 411 第二側面 313 反射片 25 第一入光區域 314 底面 232 第二入光區域 315 側面 233 、 412[Description of main component symbols] Liquid crystal display devices 2, 3, 4 Light-in areas 234, 420 Liquid crystal panel 20 light-emitting area 235a > 235b 235c ' 235d Backlight module 21, 31, 41 Printed circuit board 241 Diffusion sheet 22 Light-emitting diode Body 242 light guide plate 23, 310, 410 first side 312 light source belt 24, 311, 411 second side 313 reflective sheet 25 first light incident region 314 bottom surface 232 second light incident region 315 side 233, 412
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