1375201 九、發明說明： 【發明所屬之技術領域】 尤其係一種用於液晶顯 本發明係關於一種背光模組 示盗或液晶電視之背光模組。 【先翁技術】 因此==裝置㈣之液晶顯示面板係非發光性元件， 以-現顯：：：效果，需給液晶顯示面板提供一光源裝置1375201 IX. Description of the invention: [Technical field to which the invention pertains] In particular, the invention relates to a backlight module for a backlight module or a liquid crystal television. [First Weng technology] Therefore, the liquid crystal display panel of the device (4) is a non-illuminating component, and the liquid crystal display panel is provided with a light source device.
背光模組，其功能在於向液晶顯示面 板k供輝度充分且分佈均勾之背光源。 清參閱目1 ’得、一種A前技術背光模組之電路示意 圖三該月光杈組包括一電源電路1〇及複數燈管u。每一 燈g ^1包括一鬲壓端及一低壓端。該電源電路忉與該複 數燈官11之咼壓端電連接，其為該複數燈管U提供交流 驅動電壓。該複數燈管U之低壓端接地。該複數燈管U 為冷陰極螢光燈管。 請參閱圖2’係該背光模组之複數燈管u之理想工作 電壓示意圖。該理想工作電壓之波形為正弦波，其不包括 直流電壓成份。 ' 6月參閱圖3及圖4，係該背光模組之複數燈管^ 1之實 際工作電壓示意圖。圖3中，該工作電壓包括一直流電壓 成份Va，其值大於0，將導致該複數燈管u之汞離子偏 向低壓端移動。圖4中，該工作電壓包括一直流電壓成份 Vb’其值小於〇，將導致該複數燈管u之汞離子偏向該複 數燈管11之高壓端移動。 由於該複數燈管11之實際工作電壓中包括一直流電 6 1375201 壓成份Va或Vb，其導致該複數燈管11之汞離子偏向該複 _數燈管11之高壓端或低壓端移動。這將造成該複數燈管 -11之汞離子聚集現象，破壞該複數燈管11之汞離子均勻 分布之狀態，影響該複數燈管11之發光均勻性，從而影響 玆呰氺槿細夕硌#.始匀，W：诂綜标玆昔槿釦之I合。The backlight module has a function of providing a backlight with sufficient brightness and a uniform distribution to the liquid crystal display panel k. See Figure 1 for a circuit diagram of a front-end backlight module. Figure 3 shows that the moonlight group includes a power supply circuit 1 and a plurality of lamps u. Each lamp g ^1 includes a pressing end and a low end. The power circuit 忉 is electrically connected to the pressing end of the plurality of lamps 11 for supplying an alternating driving voltage to the plurality of lamps U. The low voltage end of the plurality of lamps U is grounded. The plurality of lamps U are cold cathode fluorescent tubes. Please refer to FIG. 2' for a schematic diagram of the ideal operating voltage of the plurality of lamps u of the backlight module. The waveform of the ideal operating voltage is a sine wave that does not include a DC voltage component. 'See the FIG. 3 and FIG. 4 in June, which is a schematic diagram of the actual working voltage of the plurality of lamps 1 1 of the backlight module. In Fig. 3, the operating voltage includes a DC voltage component Va whose value is greater than 0, which causes the mercury ions of the plurality of lamps to shift toward the low voltage end. In Fig. 4, the operating voltage includes a DC voltage component Vb' whose value is less than 〇, which causes the mercury ions of the plurality of lamps to be biased toward the high voltage end of the plurality of lamps 11. Since the actual operating voltage of the plurality of lamps 11 includes the constant current 6a, the pressure component Va or Vb, the mercury ions of the plurality of lamps 11 are biased toward the high voltage or low pressure end of the plurality of lamps 11. This will cause the mercury ion accumulation phenomenon of the plurality of lamps 11 to destroy the state of uniform distribution of the mercury ions of the plurality of lamps 11, affecting the uniformity of illumination of the plurality of lamps 11, thereby affecting the 呰氺槿 呰氺槿 硌 硌 # . Start even, W: 诂 标 标 兹 槿 槿 槿 I I I I.
**Ό 厂J I / X 、·— / V ^ · — _ ·-，— ，- —· f- ^ _ 〆 ％ · ，，^ I 【發明内容】 有鑑於此，提供一種發光均勻度較高及壽命較長之背光 模組貫為必需。 φ —種背光模組，其包括至少一第一燈管；一電源電路， 其為該第一燈管提供交流驅動電壓；一第一偵測電路，用於 偵測該第一燈管一端之直流電壓成份；及一第一直流補償電 路，其根據該第一偵測電路偵測之直流電壓成份為該第一燈 管之另一端提供一第一直流補償電壓。 一種背光模組，其包括至少一第一燈管；一電源電路， 其與該第一燈管之高壓端電連接，為該第一燈管提供交流驅 動電壓；一第一偵測電路，其輸入端與其中一第一燈管之高 •壓端電連接，用於偵測該第一燈管高壓端之直流電壓成份； 及一第一直流補償電路，其輸入端與該第一偵測電路之輸出 端電連接，輸出端與該至少一第一燈管之低壓端電連接，為 該至少一第一燈管之低壓端提供一第一直流補償電壓。 相較於先前技術，由於前述背光模組.包括一偵測電路及 -一直流補償電路，該偵測電路偵測一燈管高壓端之直流電壓 成份，該直流補償電路根據該偵測電路偵測之直流電壓成份 為該複數燈管之低壓端提供直流補償電壓，使該複數燈管二 端之直流電壓差為0，避免該複數燈管之汞離子在直流電壓 7 1375201 作用下偏向燈管之某一端，提高了該複數燈管之發光均勻度 '及其壽命，從而提高了該背光模組之發光均勻性，延長了該 -背光模組之壽命。 【實施方式】 請參閱圖5，係本發明背光模組第一實施方式之電路 示意圖。該背光模組包括複數燈管21、一電源電路20、一 偵測電路22及一直流補償電路23。該背光模組為直下式 背光模組。 • 該複數燈管21平行排列，每一燈管21包括一高壓端 211及一低壓端212,該複數高壓端211位於同一端，該複 數低壓端212位於另一端。該複數燈管21之低壓端212 電連接至該電源電路20之迴路端201。該電源電路20之 輸出端203與該複數燈管21之高壓端211電連接。該偵測 電路22之輸入端與某一燈管21之高壓端211電連接，該 偵測電路22之輸出端與該直流補償電路23之輸入端電連 接。該直流補償電路23之輸出端與該複數燈管21之低壓 _端212電連接。 該電源電路20為該複數燈管21提供交流驅動電壓。 該偵測電路22用於偵測流過該被偵測之燈管21之直流電 壓成份。該直流補償電路23根據偵測之直流電壓成份為該 複數燈管21之低壓端212提供直流補償電壓。該複數燈管 • 21為冷陰極螢光燈管。 當該背光模組工作時，該偵測電路22偵測該燈管21 高壓端211之直流電壓成份。設該直流電壓成份為Vi，則 該直流補償電路23為該複數燈管21之低壓端212提供一 8 1375201 直流補償電壓Vo，且Vi = Vo，即該直流補償電壓Vo與該 '偵測電路22偵測到之直流電壓成份Vi大小正負均相同。 -如此，該直流補償電壓Vo補償該複數燈管21低壓端212 之直流電壓，使得該複數燈管21二端之直流電壓差為0。 與先前技街相比，甴於該背光模組包括一偵測電路22 及一直流補償電路23，該偵測電路22偵測該燈管21高壓 端211之直流電壓成份，該直流補償電路23對該複數燈管 21低壓端212提供直流補償電壓，使該複數燈管21二端 鲁之直流電壓差為0，避免該複數燈管21之汞離子在直流電 作用下偏向該複數燈管21之某一端，提高了該複數燈管 21之發光均勻度及其壽命，從而提高了該背光模組之發光 均勻度及壽命。 請參閱圖6,係本發明背光模組第二實施方式之電路 示意圖。該背光模組包括複數燈管31、一電源電路30、一 第一偵測電路32、一第二偵測電路35、一第一直流補償電 路33及一第二直流補償電路36。 • 該複數燈管31平行排列，每一燈管31包括一高壓端 311及一低壓端312,該複數高壓端311位於同一端，該複 數低壓端312位於另一端。該偶數燈管31之低壓端312 電連接至該電源電路30之第一迴路端301，該奇數燈管31 之低壓端312電連接至該電源電路30之第二迴路端302。 •該電源電路30之輸出端303與該複數燈管31之高壓端311 ‘電連接。 該第一偵測電路32之輸入端與一偶數燈管31之高壓 端311電連接，該第一偵測電路32之輸出端與該第一直流 9 1375201 補償1路33之輸入端電連接。該第一直流補償電路之 輸出端與該複數偶數燈管31之低壓端312電連接。 該第二偵測電路35之輸入端與一奇數燈管31之高壓 端311電連接’該第二偵測電路35之輸出端與該第二2济 補償電路36之輪入端電連接。該第二直流補償電路％: 輸出端與該複數奇數燈管31之低壓端312電連接。 該電源電路30為該複數燈管31提供交流驅動電壓。 相鄰燈管之交流驅動電壓之相位相反，即該複數奇數燈管 31與該複數偶數燈管31之交流驅動電壓相位相反。 忒第一偵測電路32用於偵測該偶數燈管31高壓端 311之直流電壓成份。該第一直流補償電路33根據該第— 偵測電路32偵測之直流電壓成份為該複數偶數燈管31之 低壓端312提供-第-直流補償電壓。該第—直流補償電 壓與該第—偵測電& 32偵測到之直流電壓成份大小正負 均相同，使該複數偶數燈管31二端之直流電壓差為〇。 該第二偵測電路35用於偵測該奇數燈管31高壓端 311之直流電壓成份。該第二直流補償電路％根據該第二 偵測電路35偵測之直流電壓成份為該複數奇數燈管之 低壓端312提供一第二直流補償電壓。該第二直流補償電 虔與該第二谓測電路35偵測到之直流電壓成份大小正負 均相同，使該複數奇數燈管31二端之直流電壓差為〇。 該第-偵測電路32與該第二偵測電路％相同。該第 一直流補償電路33與該第二直流補償電路％相同。 由於該電源電路30提供給該複數奇數燈管31與該複 數偶數燈管31之交流驅動電壓之相位相反，該複數奇數燈 1375201 管31與該複數偶數燈管31之直流電壓成份不同。該第二 實施方式採取分㈣該複數奇數燈f 31及該複數偶數产 管提供直流補償電壓之方法，使補償更加準確。反 本發明背光模組之燈管個數亦可為一或二，該背光模 組亦可為倒邊式背光模组。該偵測電路亦可偵測該擦營= 壓端之直流㈣成份而該直流補償電路為該燈管之高壓诚 提供直流補償電壓。 細 綜上所述，本發明確已符合發明專利之要件 ^出專利申請。惟，以上所述者僅為本發明之較佳實施、方 ^ ’本發明之範圍並^上述實施方式為限，舉凡孰 士援：本發明之精神所作之等效修錦或變化， 白應涵盍於以下申請專利範圍内。 【圖式簡單說明】Ό 厂 Factory JI / X , · - / V ^ · — _ ·-, —, — —· f- ^ _ 〆% · ,, ^ I [Invention] In view of this, it provides a higher uniformity of illumination A long-life backlight module is required. The φ backlight module includes at least one first tube; a power circuit for supplying an AC driving voltage to the first tube; and a first detecting circuit for detecting one end of the first tube a DC voltage component; and a first DC compensation circuit, wherein the first DC compensation voltage is provided to the other end of the first lamp according to the DC voltage component detected by the first detection circuit. A backlight module includes at least one first lamp tube; a power supply circuit electrically connected to the high voltage end of the first lamp tube to provide an AC driving voltage for the first lamp tube; and a first detecting circuit The input end is electrically connected to the high voltage terminal of the first lamp tube for detecting the DC voltage component of the high voltage end of the first lamp tube; and a first DC compensation circuit, the input end thereof and the first detection The output end of the measuring circuit is electrically connected, and the output end is electrically connected to the low voltage end of the at least one first lamp tube to provide a first DC compensation voltage for the low voltage end of the at least one first lamp tube. Compared with the prior art, the backlight module includes a detecting circuit and a DC current compensation circuit, and the detecting circuit detects a DC voltage component of a high voltage end of the lamp, and the DC compensation circuit detects the circuit according to the detecting circuit. The measured DC voltage component provides a DC compensation voltage for the low voltage end of the plurality of lamps, so that the DC voltage difference between the two ends of the plurality of lamps is 0, and the mercury ions of the plurality of lamps are prevented from deflecting toward the lamp under the action of the DC voltage 7 1375201. At one end, the uniformity of illumination of the plurality of lamps is improved and the lifetime thereof is improved, thereby improving the uniformity of illumination of the backlight module and prolonging the life of the backlight module. [Embodiment] Please refer to FIG. 5, which is a circuit diagram of a first embodiment of a backlight module of the present invention. The backlight module includes a plurality of lamps 21, a power circuit 20, a detecting circuit 22, and a DC compensation circuit 23. The backlight module is a direct type backlight module. • The plurality of lamps 21 are arranged in parallel. Each of the lamps 21 includes a high voltage end 211 and a low pressure end 212. The plurality of high voltage ends 211 are at the same end, and the plurality of low voltage ends 212 are located at the other end. The low voltage terminal 212 of the plurality of lamps 21 is electrically connected to the loop terminal 201 of the power circuit 20. The output terminal 203 of the power supply circuit 20 is electrically connected to the high voltage terminal 211 of the plurality of lamps 21. The input end of the detecting circuit 22 is electrically connected to the high voltage end 211 of a certain lamp tube 21. The output end of the detecting circuit 22 is electrically connected to the input end of the DC compensating circuit 23. The output of the DC compensation circuit 23 is electrically connected to the low voltage terminal 212 of the plurality of lamps 21. The power supply circuit 20 supplies an alternating drive voltage to the plurality of lamps 21. The detecting circuit 22 is configured to detect a DC voltage component flowing through the detected lamp tube 21. The DC compensation circuit 23 provides a DC compensation voltage to the low voltage terminal 212 of the plurality of lamps 21 based on the detected DC voltage component. The plurality of lamps • 21 is a cold cathode fluorescent tube. When the backlight module is in operation, the detecting circuit 22 detects the DC voltage component of the high voltage end 211 of the lamp tube 21. If the DC voltage component is Vi, the DC compensation circuit 23 provides an 8 1375201 DC compensation voltage Vo for the low voltage terminal 212 of the plurality of lamps 21, and Vi = Vo, that is, the DC compensation voltage Vo and the 'detection circuit 22 The detected DC voltage component Vi has the same positive and negative magnitude. - The DC compensation voltage Vo compensates the DC voltage of the low voltage terminal 212 of the plurality of lamps 21 such that the DC voltage difference between the two ends of the plurality of lamps 21 is zero. Compared with the prior art street, the backlight module includes a detecting circuit 22 and a DC compensation circuit 23, and the detecting circuit 22 detects a DC voltage component of the high voltage end 211 of the lamp tube 21. The DC compensation circuit 23 Providing a DC compensation voltage to the low voltage terminal 212 of the plurality of lamps 21, so that the DC voltage difference between the two ends of the plurality of lamps 21 is 0, so that the mercury ions of the plurality of lamps 21 are prevented from being biased toward the plurality of lamps 21 by the direct current. At one end, the uniformity of illumination and the lifetime of the plurality of lamps 21 are improved, thereby improving the uniformity and lifetime of illumination of the backlight module. Please refer to FIG. 6, which is a circuit diagram of a second embodiment of a backlight module of the present invention. The backlight module includes a plurality of lamps 31, a power circuit 30, a first detecting circuit 32, a second detecting circuit 35, a first DC compensation circuit 33, and a second DC compensation circuit 36. The plurality of lamps 31 are arranged in parallel. Each of the lamps 31 includes a high voltage end 311 and a low voltage end 312. The plurality of high voltage ends 311 are at the same end, and the plurality of low voltage ends 312 are located at the other end. The low voltage end 312 of the even lamp tube 31 is electrically connected to the first loop end 301 of the power circuit 30, and the low voltage end 312 of the odd number lamp tube 31 is electrically connected to the second loop end 302 of the power circuit 30. • The output end 303 of the power supply circuit 30 is 'electrically connected' to the high voltage end 311 of the plurality of lamps 31. The input end of the first detecting circuit 32 is electrically connected to the high voltage end 311 of an even number of lamps 31, and the output end of the first detecting circuit 32 is electrically connected to the input end of the first DC 9 1375201 compensation 1 way 33 . The output end of the first DC compensation circuit is electrically connected to the low voltage end 312 of the complex even lamp tube 31. The input end of the second detecting circuit 35 is electrically connected to the high voltage end 311 of the odd-numbered lamp tube 31. The output end of the second detecting circuit 35 is electrically connected to the wheel-in end of the second second compensation circuit 36. The second DC compensation circuit %: is electrically connected to the low voltage end 312 of the plurality of odd lamps 31. The power supply circuit 30 supplies an alternating drive voltage to the plurality of lamps 31. The phase of the alternating driving voltage of the adjacent lamps is opposite, that is, the phase of the alternating driving voltage of the plurality of odd lamps 31 and the plurality of even lamps 31 is opposite. The first detecting circuit 32 is configured to detect a DC voltage component of the high voltage terminal 311 of the even lamp tube 31. The first DC compensation circuit 33 provides a -first DC compensation voltage to the low voltage terminal 312 of the complex even lamp tube 31 according to the DC voltage component detected by the first detecting circuit 32. The first DC compensation voltage is equal to the magnitude of the DC voltage component detected by the first detection power & 32, so that the DC voltage difference between the two ends of the plurality of even lamps 31 is 〇. The second detecting circuit 35 is configured to detect a DC voltage component of the high voltage terminal 311 of the odd lamp tube 31. The second DC compensation circuit % provides a second DC compensation voltage for the low voltage terminal 312 of the plurality of odd lamps according to the DC voltage component detected by the second detection circuit 35. The second DC compensation voltage is equal to the magnitude of the DC voltage component detected by the second pre-measure circuit 35, so that the DC voltage difference between the two ends of the plurality of odd-numbered lamps 31 is 〇. The first detecting circuit 32 is identical to the second detecting circuit %. The first DC compensation circuit 33 is identical to the second DC compensation circuit %. Since the power supply circuit 30 supplies the phase of the alternating driving voltage of the plurality of odd-numbered lamps 31 to the complex even-numbered lamps 31, the complex odd-numbered lamps 1375201 and the complex-numbered lamps 31 have different DC voltage components. The second embodiment adopts a method of providing (4) the plurality of odd-numbered lamps f 31 and the complex even-numbered tubes to provide a DC compensation voltage, so that the compensation is more accurate. The number of the lamps of the backlight module of the present invention may also be one or two, and the backlight module may also be a flip-type backlight module. The detection circuit can also detect the DC (four) component of the wiper = voltage terminal and the DC compensation circuit provides a DC compensation voltage for the high voltage of the lamp. In summary, the present invention has indeed met the requirements of the invention patent. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is limited to the above embodiments, and the equivalent of the spirit or the change of the spirit of the present invention, Bai Yinghan It is within the scope of the following patent application. [Simple description of the map]
圖1係一 圖2係圖 圖3及圖 圖。 種先；技術背光模組之電路示专图 1所示背光模組燈管之理想 4係圖1所示背光模組燈管 工作電壓示意圖。 之實際工作電壓示意 圖5係本發明背光模組 第 • - — — -· 月知方式 圖6係本發明背光模組第二實施方式 【主要元件符號說明】 電源電路 20 燈管 21 輸出端 203、 迴路端 201、301、 '30 、31 303 302 偵測Ί 直流相 1¾壓端 低壓罐 路示意圖。 路示意圖。 22 ' 32 、 35 路 23 、 33 、 36 211 ' 311 212 、 312 11Figure 1 is a diagram of Figure 2 and Figure 3 and Figure. First, the circuit diagram of the technical backlight module is ideal. The ideal example of the backlight module lamp shown in Fig. 1 is the schematic diagram of the working voltage of the backlight module lamp shown in Fig. 1. 5 is the backlight module of the present invention. FIG. 6 is a second embodiment of the backlight module of the present invention. [Main component symbol description] Power circuit 20 lamp tube 21 output terminal 203, The loop ends 201, 301, '30, 31 303 302 detect the Ί DC phase 13⁄4 pressure terminal low pressure tank schematic. Road map. 22 ' 32 , 35 Road 23 , 33 , 36 211 ' 311 212 , 312 11