200935146 六、發明說明： 【發明所屬之技術領域】 本發明涉及一種可以應用於諸如液晶電視、電腦、手機、… 等顯示器做為發光裝置的背光模組。 【先前技術】 對於一些電子產品而言，其操作介面是否能夠發光除了涉及 ❹照明效果外，還關係到視覺美觀、質感等方面的附加價值。所述 具有發光效果的操作介面，通常包含有一背光模組，該背光模組 的結構主要包括有一導光板與至少一光源，導光板包含一出光面 以及至少一入光面，與出光面相對之底面通常做為入光面，或可 將導光板的側邊做為入光面，並於該入光面設置光源；導光板的 正面可以按實際需要依序貼設增光片、擴散片等光學膜片。普遍 被使用_光式導光板，即在絲㈣至少_側邊設置光源，而 ❿導光板的底面通常設置有反射片，以將溢出導光板的光線反射回 收至導光板内重新整理利用，並防止背光模組漏光，經過增光片 與擴散片的光線由預定之視角或方向導出，以呈現良好的光輝度 與均勻度。 所述光源可為發光二極體(LED，light emitting diode)或冷 陰極管(CCFL) ·，由於體積小、耗電少、使用壽命長的優點，使用 於背光模組的光源已有逐漸由LED取代CCFL的趨勢。使用於背光 板組的光源多使用白光，而利用LED產生白光的方法有兩種： 3 200935146 第一種疋在藍光二極體令加入螢光劑來吸收藍光，進而釋放 出白色光’其色度由藍色晶片的波長及螢光劑成份決定。其優點 是驅動線路簡單；缺點則是一經選定色度或色溫，即無法在實際 應用中調整。 另一種白光則經由適當的混合紅、綠、藍三種顏色的色光來 達到。其優點是藉由紅、綠、藍，轉雜的搭配，可糊整出全 色域的光（包含白光）。缺點是驅動線路的設計複雜，成本很高。 ❹ 【發明内容】 本發明的目的在於提供一種可以微調整色度或色溫，且成本 低廉的背光模組與方法。 本發明的方法，其特徵是提供複數種不同色度的白光LED，並 以相同色度的白光led為一組分別連接獨立的電路迴路，藉由通 入電流而使不同色度的白光LE：D分別產生不同色度的光，並將該 ❹光投射進入導光板以在導光板内形成混光，藉由控制電流量的大 小’則可改變色度並做微調改變。 本發明的技術手段，是在導光板的至少一侧邊設置二種或二 種以上不同色度之白光led ’該些不同色度的白光LED可以在導光 板上做任何適當的排列組合佈置；相同色度的白光LED為一組並 分別連接一獨立的電路迴路，在通入電流時，不同色度的白光LED 分別產生不同的光色進入導光板，並在導光板内形成混光；又， 200935146 藉由控制電流量的大小，可改變色度，且該色度是在一特定的色 度範圍内（例如在所述不同色度的白光led之間）微調改變。 本發明可以在一導光板的一側設置二種不同色度的白光 LED ’其第一色度白光LED與第二色度白光LED可以在導光板上做 父錯排列佈置’或同色度者兩兩成一組地交錯排列佈置，或任何 適當的排列組合佈置。所述各個第一色度白光LED為一組連接一 獨立的電路迴路，各個第二色度白光LE：D為一組連接另一獨立的 Ο 電路迴路，藉由通入不同的電流量，使第一色度白光LED及/或第 二色度白光led產生不同色度的光，又藉由改變電流量時，可以 改變光的色度’在導光板中產生的混光也因而改變色度。 本發明可以在導光板的一側設置具有三種或三種以上不同色 度的白光LED ’該些不同色度的白光LED可以呈依序循環排列地佈 碑設於該導光板，或同色度者兩兩成一組再依序循環排列佈置， 或任何適當的排列組合佈置。相同色度的白光LED為一組並分別 ❹連接-獨立的電路迴路，藉由通入不同的電流量來微調改變光的 色度。 本發明也可以將前述數種不同色度白光LED的佈設，設於導 光板的二侧邊或二側邊以上，其設置的邊數可依導光板的面積 大小而定。 【實施方式】 200935146 以下配合圖式及元件符號對本發明的實施方式做更詳細的說 明，俾使熟習該項技藝者在研讀本說明書後能據以實施。 參閱第一圖所示，本發明的第一實施例，是在一導光板1的 一側佈設複數光源2’所述光源包含有兩種不同色度的第一色度白 光LED21與第二色度白光LED22，其可以等距離地佈設，也可以 不等距離地佈設；又，基於導光板發光均勻性的考量，所述第一 色度白光LED21與第二色度白光LED22最好呈交錯排列，使射入 Ο 導光板内的光能交錯地覆蓋；其中，該些第一色度白光LED21共 同連接一獨立的電路迴路’該些第二色度白光LED22共同連接另 一獨立的電路迴路；當通入電流時，得以使該些LED產生的光線 射入導光板1，且不同色度的白光LED分別產生不同的光色，該不 同的光色在所述導光板1内混光，從而在導光板表現出該光色。 本發明可以藉由分別控制通入第一色度白光LED21及/或第二色度 白光LED22的電流量大小來分別改變光色，使得導光板表現出不 © 同的色度’而該色度的差異，可以在所述白光LED的不同色度之 間微調改變者。除此之外，本發明也可以分別將相同色度的第一 色度白光LED兩兩排列成一組，以及將相同色度的第二色度白光 LED兩兩排列成一組後，再將各組交錯排列佈置。當然也可以將第 一色度白光LED與第二色度白光LED做任何適當的排列組合佈置 於導光板。 第二圖係顯示本發明的另一實施例，可以在一導光板1的一 200935146 側佈設包含有三種不同色度的第一色度白光1^1)2卜第二色度白光 LED22與第二色度白光LED ’該些LED可以等距離地佈設，也可以 不等距離地佈設；在此一實施例，所述第一色度白光LED2i、第二 色度白光LED22與第三色度白光LED23最好是依序循環排列佈 設’亦即三個不同色度的白光LED為一組地依序排列；其申，第 一色度白光LED21共同連接一獨立的電路迴路，第二色度白光 LED22共同連接另一獨立的電路迴路，第三色度白光LED23又連接 〇 另一獨立的電路迴路；當通入電流時，得以使該三種色度的led 將光線射入導光板1，以在導光板1内形成混光。同様的，本發明 可以藉由分別控制通入第一色度白光LED2卜第二色度白光LED22 及/或第三色度白光LED23的電流量大小來分別改變光色，使得導 光板表現出不同的色度，而該色度的差異，可以在所述白光LED 的不同色度之間微調改變者。除此之外，本發明也可以將三種不 同色度之白光LE：D，以相同色度者兩兩排列成一組後，再依序循環 φ 排列佈置，或任何適當的排列組合佈置。 第三圖所示係顯示本發明的又一實施例，可以在導光板1的 相對兩侧分別佈設包含有兩種不同色度的第一色度白光LED21與 第二色度白光LED22，該些LED可以等距離地佈設’也可以不等距 離地佈設；第一色度白光LED21與第二色度白光LED22是呈交錯 排列，或採混合排列；或是三種色度的白光LE：D以前述的方式排 列，或採混合排列；所述不同色度的白光LE：D各自為一組，並分 7 200935146 別連接一獨立的電路迴路；當通入不同的電流量時，得以改變射 入導光板内的光線色度。再者，可以將相同色度的白光LE：D設在 導光板兩側相對稱的位置，也可以將不同色度的白光led設在導 光板兩侧相對稱的位置。 前述數種不同色度的白光LED，也可以如第四圖所示地佈置在 導光板1的二邊，也可以佈置在一導光板的四邊(如第五圖所 ❹ 示）’且相同色度的白光LED各自連接一獨立的電路迴路，亦能達 到前述相同的微調整色度的要求。 以上所述者僅為用以解釋本發明之較佳實施例，並非企圖具 以對本發日績任铜M上之關，如， 下所作娜發明之任何 Z月精神 保護之射。 《$仍應包括在本發明意圖 200935146 【圖式簡單說明】 第-圖為顯示本㈣在導光板—側邊設置兩種不同色度之複數白 光且不同色度之白光LED呈交錯佈設之實施例示意圖。 第圖為顯不本發明在導光板一側邊設置三種不同色度之複數白 光LED且不同色度之白光LED呈依序循環排列佈言史之實施例示意 圖。 第三圖為顯示本發明在導光板相對兩側邊分別設置兩種不同色度 ❹之複數白* LED’且不同色度之白* 呈交錯佈設之實施例示意 圖。 第四圖為顯示本發明在導光板三侧邊分職置兩種不同色度之複 數白光LED’且不同色度之白光LED呈交錯佈設之實施例示意圖。 第五圖為顯示本發明在導光板四側邊分別設置兩種不同色度之複 數白光LED’且不同色度之白光LED呈交錯佈設之實施例示意圖。 © 【主要元件符號說明】 1……導光板 2......光源200935146 VI. Description of the Invention: [Technical Field] The present invention relates to a backlight module which can be applied to a display such as a liquid crystal television, a computer, a mobile phone, or the like as a light-emitting device. [Prior Art] For some electronic products, whether the operating interface can emit light is not only related to the lighting effect, but also relates to the added value of visual beauty and texture. The illuminating operation interface generally includes a backlight module. The backlight module mainly includes a light guide plate and at least one light source. The light guide plate includes a light emitting surface and at least one light incident surface, and the light emitting surface is opposite to the light emitting surface. The bottom surface is generally used as a light incident surface, or the side of the light guide plate can be used as a light incident surface, and a light source is disposed on the light incident surface; the front surface of the light guide plate can be sequentially attached with opticals such as a brightness enhancement sheet and a diffusion sheet according to actual needs. Diaphragm. Generally used _ light-type light guide plate, that is, at least the side of the wire (four) is provided with a light source, and the bottom surface of the ❿ light guide plate is usually provided with a reflective sheet to reflect and reflect the light of the overflow light guide plate to the light guide plate for rearrangement and utilization, and The backlight module is prevented from leaking light, and the light passing through the brightness enhancement sheet and the diffusion sheet is derived from a predetermined viewing angle or direction to exhibit good brightness and uniformity. The light source may be a light emitting diode (LED) or a cold cathode tube (CCFL). Due to the advantages of small size, low power consumption and long service life, the light source used in the backlight module has been gradually LEDs replace the trend of CCFL. The light source used in the backlight panel group uses white light, and the LED uses white light to generate white light. 3 200935146 The first type of germanium in the blue light diode adds a fluorescent agent to absorb blue light, thereby releasing white light. The degree is determined by the wavelength of the blue wafer and the composition of the phosphor. The advantage is that the drive line is simple; the disadvantage is that once the selected color or color temperature is selected, it cannot be adjusted in practical applications. Another type of white light is achieved by appropriately mixing the colors of the red, green and blue colors. The advantage is that the red, green, blue, and miscellaneous mixes can be used to illuminate the full color gamut (including white light). The disadvantage is that the design of the drive line is complicated and costly. SUMMARY OF THE INVENTION [0005] It is an object of the present invention to provide a backlight module and method that can finely adjust chromaticity or color temperature and at low cost. The method of the present invention is characterized in that a plurality of white LEDs of different chromaticities are provided, and white light LEDs of the same chromaticity are respectively connected as a group of independent circuit loops, and white light LE of different chromaticities is obtained by passing current: D respectively generates light of different chromaticities, and projects the illuminating light into the light guide plate to form a mixed light in the light guide plate, and by controlling the magnitude of the current amount, the chromaticity can be changed and the fine adjustment can be made. The technical means of the present invention is to provide two or more white light LEDs of different chromaticities on at least one side of the light guide plate. The white LEDs of different chromaticities can be arranged in any suitable arrangement on the light guide plate; The white LEDs of the same color are a group and are respectively connected to a separate circuit loop. When the current is applied, the white LEDs of different chromaticities respectively generate different light colors into the light guide plate, and form a mixed light in the light guide plate; , 200935146 By controlling the amount of current, the chromaticity can be changed, and the chromaticity is a fine-tuning change within a specific chromaticity range (for example, between white light LEDs of different chromaticities). The invention can provide two white LEDs of different chromaticity on one side of a light guide plate. The first chromatic white LED and the second chromatic white LED can be arranged in a wrong arrangement on the light guide plate or two of the same chromaticity. Arranged in a staggered arrangement, or in any suitable arrangement. Each of the first chromatic white LEDs is connected to a set of independent circuit loops, and each of the second chromatic white lights LE:D is connected to another independent 电路 circuit loop by using different current amounts. The first chromatic white LED and/or the second chromatic white LED generate light of different chromaticities, and by changing the amount of current, the chromaticity of the light can be changed, and the chromaticity generated in the light guide plate also changes the chromaticity. . The invention can be provided with white LEDs having three or more different chromaticities on one side of the light guide plate. The white LEDs of different chromaticities can be arranged in a sequence of arbitrarily arranged on the light guide plate, or two of the same chromaticity. The two groups are arranged in a sequential arrangement, or in any suitable arrangement. White LEDs of the same chromaticity are grouped and connected separately - independent circuit loops, which are fine-tuned to change the chromaticity of the light by passing different amounts of current. In the present invention, the arrangement of the plurality of different chromatic white LEDs may be provided on the two sides or both sides of the light guide plate, and the number of sides may be determined according to the size of the light guide plate. [Embodiment] The embodiments of the present invention will be described in more detail below with reference to the drawings and the reference numerals, and the skilled person will be able to implement the present invention after studying the present specification. Referring to the first embodiment, in a first embodiment of the present invention, a plurality of light sources 2' are disposed on one side of a light guide plate 1. The light source includes two first color white LEDs 21 and a second color of different chromaticities. The white LEDs 22 can be arranged equidistantly or unequally. Moreover, the first chromatic white LEDs 21 and the second chromatic white LEDs 22 are preferably staggered based on the consideration of the uniformity of the light guide. The light energy incident on the light guide plate is alternately covered; wherein the first color white LEDs 21 are connected in common to a separate circuit circuit. The second color white LEDs 22 are connected to another independent circuit circuit; When the current is applied, the light generated by the LEDs is incident on the light guide plate 1, and the white LEDs of different chromatic colors respectively generate different light colors, and the different light colors are mixed in the light guide plate 1 The light color is exhibited on the light guide plate. The present invention can respectively change the color of the light by separately controlling the amount of current flowing into the first chromatic white LED 21 and/or the second chromatic white LED 22, so that the light guide exhibits the same chromaticity 'the chromaticity The difference is that the changer can be fine-tuned between different chromaticities of the white LED. In addition, the present invention can also respectively arrange the first chromatic white LEDs of the same chromaticity into two groups, and arrange the second chromatic white LEDs of the same chromaticity into two groups, and then set each group. Staggered arrangement. It is of course also possible to arrange the first chromatic white LED and the second chromatic white LED in any suitable arrangement in the light guide. The second figure shows another embodiment of the present invention. A first chromatic white light 1^1) 2 and a second chromatic white LED 22 and a third chromaticity may be disposed on a side of a light guide plate 1 on a 200935146 side. Two-color white LEDs 'The LEDs may be arranged equidistantly or may be arranged at different distances; in this embodiment, the first chromatic white LED 2i, the second chromatic white LED 22 and the third chromatic white light Preferably, the LEDs 23 are arranged in a sequential arrangement, that is, three white LEDs of different chromaticities are sequentially arranged in a group; wherein, the first chromatic white LEDs 21 are connected in common to an independent circuit loop, and the second chromatic white light The LEDs 22 are connected in common to another independent circuit loop, and the third chromatic white LEDs 23 are connected to another independent circuit loop; when the current is applied, the LEDs of the three chromaticities are incident on the light guide plate 1 to A light mixture is formed in the light guide plate 1. Similarly, the present invention can separately change the color of the light by separately controlling the amount of current flowing into the first chromatic white LED 2 and the second chromatic white LED 22 and/or the third chromatic white LED 23, so that the light guide plate exhibits different The chromaticity, and the difference in chromaticity, can be fine-tuned between the different chromaticities of the white LED. In addition, the present invention can also arrange three kinds of white light LE:D of different chromaticities, arranged in a group of the same chromaticity, and then arranged in a sequence of φ, or any suitable arrangement. The third figure shows a further embodiment of the present invention. First chrominance white LEDs 21 and second chromatic white LEDs 22 including two different chromaticities may be respectively disposed on opposite sides of the light guide plate 1 . The LEDs can be arranged equidistantly or can be arranged at different distances; the first chromatic white LEDs 21 and the second chromatic white LEDs 22 are staggered or mixed; or three chromatic whites LE:D are as described above. Arranged in a manner or mixed arrangement; the white light LE:D of different chromaticities is a group, and is connected to an independent circuit loop according to 7 200935146; when different current amounts are input, the injection guide can be changed. The chromaticity of the light inside the light panel. Furthermore, the white light LE:D of the same chromaticity can be set at a position opposite to the two sides of the light guide plate, and the white light LEDs of different chromaticities can be disposed at opposite positions on both sides of the light guide plate. The foregoing several different color chromatic white LEDs may also be arranged on the two sides of the light guide plate 1 as shown in the fourth figure, or may be arranged on the four sides of a light guide plate (as shown in the fifth figure) and the same color. The white LEDs of each degree are connected to a separate circuit loop, and the same micro-adjusted chromaticity requirements can be achieved. The above description is only for explaining the preferred embodiment of the present invention, and is not intended to be used for the purpose of the present invention. "$ should still be included in the intention of the present invention 200935146 [Simple description of the figure] The first picture shows the implementation of (4) setting a plurality of white lights of different chromaticities on the side of the light guide plate and white light LEDs of different chromaticities are staggered. Illustration of the example. The figure shows a schematic diagram of an embodiment in which a plurality of white LEDs of different chromaticities are disposed on one side of the light guide plate and white light LEDs of different chromaticity are sequentially arranged in a sequence. The third figure is a schematic view showing an embodiment in which two different color ❹ plural white * LED's are disposed on opposite sides of the light guide plate, and whites of different chromaticities are arranged in a staggered manner. The fourth figure is a schematic diagram showing an embodiment in which the white light LEDs of two different chromaticities are placed on the three sides of the light guide plate and the white LEDs of different chromaticities are staggered. The fifth figure is a schematic view showing an embodiment in which a plurality of white LEDs of different chromaticities are disposed on the four sides of the light guide plate, and white LEDs of different chromaticities are staggered. © [Main component symbol description] 1... Light guide plate 2... Light source
21......第一色度白光LED21...first chromatic white LED
22······第二色度白光LED22······Second color white LED
23......第三色度白光LED23...third chromatic white LED