!289〇3〇 九、發明說明： 【發明所屬之技術領域】 —本發明側於液晶顯示背光模組，翻後—_振式液晶顯 示背光模組。 【先前技術】 &者液晶顯不技術的發展，液晶顯示器已成為電腦的基本配 備在大尺、」液晶顯不器的技術成熟後，也將取代家中的電視成 為家庭視聽設備。 因此，液晶顯示裝置中點亮液晶以顯示色彩的背光燈管在這 個技術範疇中也是一個相當重要的技術課題。 先前技術所揭露之多燈管模組中，以雙燈管為例，依推彭 控制燈管的線路結構，有『第6A圖』以及『第6B圖』所示兩種。 請參考『第6八圖』，圖中所示的背光模組由_控制/推動電 路100以及一推動變壓器2〇〇所組成，推動變壓器2〇〇將控制燦 動電路1〇〇所出的電壓升壓以點亮背光燈管300。背光燈管3〇〇 的低壓端祕有整流二極體3㈤m以及·D2，作為整流之用， 正*-極體300D1與接地端間串聯有一取樣電阻R1，用以取樣背 光燈管300的回授電流。 每一根背光燈管和其控制/推動電路為一組獨立電路，採用多 k g ’即是將此電路重複多次，以構成—多燈管模組。這個電 路主要關題是龜成本依燈管數等比例直線上升，且所有推動 迅路時鐘訊號必須同步以避免背光閃爍。 1289030 請參考『第6B圖』，多燈管僅由1制/推動電路ι〇〇來推 動。燈管之間的電流差異由串接在背光燈管別、32〇高壓端的平 衡電容310C、就來補償，背光燈管31〇、32〇的低壓端輕接有 整流二極體3順、3臟以及32_、32_，作為整流之用， 整流二極體31GD1和320D1與接地端間串聯有―取樣電阻於， 用以取樣背光燈管310和320的回授電流。 第6B圖』中所示的多燈管模組的問題主要在於要使平衡 電容避、遞有平衡管電⑽_，平衡f容道、就的 阻抗必須接近燈管阻抗。如此則大幅度提升推動變壓器二次側的 工作電壓’造成變壓器成本上升，模組可靠性下降。模組電力效 率也會因而降低。 〜隨著液晶顯㈣翻逐漸驗，其尺寸也逐漸加大，因此背 择、'、斤制的々陰讀目也必須隨著增加以維持相同或較高的亮 :土“度刀佈韵F延長燈管壽命要求，燈管電流的絕對值 差轉嚴謹㈣。因鱗料燈管液晶顯示背光模組需要 —個有效的解決方案。 【發明内容】 的問題’本翻社要目的在於提供，諧振式液 銜*/株組’係_單—控制/推動電路加上背光燈管電流平 κ 、，—、滿足雙燈官/組背光推動模組低成本與電流平衡的需 求’亚㈣解決先前技術所存在的技術問題。 1289030 因此，為達上述目μ ,^ 、，本务明所揭露之諧振式 模組，用以推動-第1f/組與 Ί日顯不月先 衡，包括有-控制/雜電路 ’且s、且亚達燈f電流平 電源，·-推動變壓器，將兮六'“輪入的直流電源轉換成交流 南電壓；以及-電流平衡電路，用以在 作，所而 率和紐㊉社紅作轉—科達鮮雜頻 卜簡化雙燈管模組電路，_單_控制/推 及 =厂堅變_來機雙燈f，w降低科數，提升電力效率=靠 2、可降紐管额縣又有效平碰㈣流。 男關本發日_徵與實作，聽合圖树最佳實 明如下。 【實施方式】 本!X明所揭路之譜振式液晶顯示背光模組請參考『第 圖』’係由-控制/推動電路1〇〇、一推動變壓器2〇〇、_電流平衡 電路400、以及一燈管電流取樣電路500，组成，以推動一第一燈管 301以及-第二燈管3〇2。其中第一燈管3〇1亦可為多支燈管所組 成之燈管組，第二燈管302亦同。 控制/推動f路⑽將輸人錢電祕轉為交流電壓以驅動推 1289030 動k壓$ 2GG的-次側’同時可調變輸人功率瓦數以調變燈 流。 推動變壓益200將一次侧的低壓提升到點亮第一燈管3〇ι以 及-第二燈管302所需的高壓。燈管電流取樣電路5⑻則將第一 燈官301卩及一第二燈管302的電流週授到控制/推動電路1〇〇中。 由於燈管阻抗·差異，如直接並聯推動，燈f電流會不一 致，造成背光亮度不均勻和降低燈管壽命。本發明以電感和平衡 %谷組成的電Μ平衡電路4⑻來分離第一燈管以及一第二燈 官302的推動點，再以電流平衡電路4⑻在接近諧振頻率時的阻 抗特性來補償燈管間差異以達到轉燈管電流平衡。電流平衡雷 路的諧振頻率和燈管工作頻率一致時可以達到最佳燈管電漭平 衝 『第1Α圖』中所示的電流平衡電路4⑻係轉接於燈管的高 壓编，『第1Β圖』中所示的電流平衡電路4⑻係轉接於燈管的低 壓端，若採取雙高壓接法，例如，長燈管或U型燈管，則雷流平 衡電路4⑻可如『第1C圖』中所示耦接於燈管高壓端之任一端。 電流平衡電路400的組成如『第2圖』所示，係由由五個元 件構成分別為第一阻抗Za、第二阻抗2；1)、第三阻抗Zc、第四阻 抗Zd以及第五阻抗Ze，其中第一阻抗Za以及第二阻抗办為同 型元件，第四阻抗Zd以及第五阻抗Ze為同型元件，各阻抗可為 電感或電谷或電感與電谷的組合。此五個組阻抗組成_個四端點 1289030 平衡包路’分別透過_第一端·點N1以及第二端‘點奶連接燈管/ 組。第三端點N3以及第四端點N4連接燈管推動訊號。 『第3圖』為『第1A圖』變壓器二次側等效電路，其中& 為變壓器二次側漏感，Zp錢壓器二次側電容。Za、办、&、& 乂及Ze*第燈官3〇1以及第二燈管搬則構成—雙端點 N2)RLC共振魏，因此變㈣二:域域Zs和變壓&次側電 容邙對第—燈管301以及第二燈管3〇2電流平衡無作用。一 電流平衡電路的平衡原理可以從N1和N2兩端點來看， z说b、Zc、Zd+Ze和燈管構成一組尺L c 聯共振電路。里中， 燈管為R，LC則由第一阻抗Za、第二阻抗zb、第三阻抗Zc、第 四阻抗z仏及第五阻抗Ze構成。當控制/推動電路⑽的工作頻 车(亦即燈管工作頻率)和電流平衡電路4()_振頻率相等時，再 加上A與Zb的比等於Zd與Ze的比條件，第—燈管观和第二 燈管竭恤會為第-阻抗办和第二阻抗㈣反比例 t弟-燈官3〇i的電流边=第二燈管3〇2電祕。如z柯 叫Zd=Ze，則第-燈管則和第二燈管3〇2的電流會大小與相 位皆相等，即使其阻抗有大的差異。 『第4圖』為燈f電流的頻率嚮應，此_示5GK歐姆(第一 ^管3叫和祖歐_二鮮地)域在接近級赫兹 a+Zb、Z。、Zc^Ze的諧麵稱錢流切於相等，平衡時的 頻率F—/，(LC)，L與c分料鱗巾㈣祕與電容值。 1289030 電流平衡電路的第-實施例如『第5A圖』所示，其中第一 戸充之a苐一阻抗办為電感（La、Lb)與電容（Ca、Cb )組合， 第二卩且抗Zc、第四阻抗2(1以及第五阻抗為電容（Cc、Cd、[289] 〇 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 。 。 。 。 。 [Prior Art] With the development of LCD technology, LCD monitors have become the basic equipment for computers. After the technology of LCD monitors is mature, it will replace TVs in homes as home audio-visual equipment. Therefore, a backlight tube in which a liquid crystal is lit to display a color in a liquid crystal display device is also a very important technical subject in this technical field. In the multi-lamp module disclosed in the prior art, the two-lamp tube is taken as an example, and the circuit structure of the control tube according to the push-pull is two types shown in "A 6A" and "6B". Please refer to "6th 8th". The backlight module shown in the figure is composed of _ control/push circuit 100 and a push transformer 2〇〇. Pushing the transformer 2〇〇 will control the output of the switch circuit 1 The voltage is boosted to illuminate the backlight tube 300. The low-voltage end of the backlight tube has a rectifying diode 3 (f) m and · D2 for rectification, and a sampling resistor R1 is connected in series between the positive-polar body 300D1 and the ground for sampling the back of the backlight tube 300. Give current. Each backlight tube and its control/push circuit are a set of independent circuits, which are repeated multiple times using multiple k g ' to form a multi-lamp module. The main concern of this circuit is that the cost of the turtle rises linearly according to the number of lamps, and all the driving signals of the Xun Road must be synchronized to avoid backlight flicker. 1289030 Please refer to "Picture 6B". Multi-lamps are only driven by the 1/push circuit. The current difference between the lamps is compensated by the balance capacitor 310C connected in series with the backlight tube and the 32-inch high-voltage end. The low-voltage terminals of the backlight tubes 31〇 and 32〇 are connected with the rectifying diodes 3 and 3 Dirty and 32_, 32_, for rectification, between the rectifying diodes 31GD1 and 320D1 and the ground terminal, there is a "sampling resistor" for sampling the feedback current of the backlight tubes 310 and 320. The problem with the multi-lamp module shown in Fig. 6B is that the balance capacitor should be avoided and the balance tube (10)_ should be balanced. The balance f capacity must be close to the lamp impedance. In this way, the operating voltage on the secondary side of the transformer is greatly increased, resulting in an increase in transformer cost and a decrease in module reliability. Module power efficiency is also reduced. ~ With the liquid crystal display (four) turn gradually, its size is gradually increased, so the back choice, ', the cubital reading of the catty system must also increase with the same to maintain the same or higher brightness: soil "degree knife cloth rhyme F extends the lamp life requirement, and the absolute value difference of the lamp current is rigorous (4). Because the squaring lamp liquid crystal display backlight module needs an effective solution. [Inventive content] The problem is to provide , Resonant liquid type * / group 'system _ single - control / push circuit plus backlight tube current level κ,, -, meet the needs of dual-lamp official / group backlight push module low cost and current balance 'Asia (four) Solving the technical problems existing in the prior art. 1289030 Therefore, in order to achieve the above-mentioned objectives, the resonant module disclosed in the present invention is used to promote - the 1f/group and the next day are not balanced, including With - control / miscellaneous circuit and s, and Yada lamp f current flat power supply, ·- push the transformer, convert the six-'" wheeled DC power into AC south voltage; and - current balance circuit for , and the rate and the New Ten Society red work turn - Kodak fresh frequency Dual-lamp module circuit, _ _ single control / push and becomes firm _ = factory machine dual lamp to f, w reduce the number of subjects, to enhance the power efficiency by = 2, the tube can be reduced York County and effective amount of (iv) flat touch stream. The men's customs issue _ levy and implementation, listening to the picture tree best practices are as follows. [Embodiment] Please refer to the "Graphic" of the spectrum-type liquid crystal display backlight module of the X-Ming's road. The control/push circuit 1〇〇, the push transformer 2〇〇, the _ current balance circuit 400 And a lamp current sampling circuit 500, which is configured to push a first lamp tube 301 and a second lamp tube 3〇2. The first tube 3〇1 may also be a tube group composed of a plurality of tubes, and the second tube 302 is also the same. Control/push the f-way (10) to convert the input money to the AC voltage to drive the push-up 1289030 to push the $2GG-sub-side' and simultaneously adjust the input power wattage to modulate the lamp flow. Pushing the pressure relief 200 raises the low pressure on the primary side to the high voltage required to illuminate the first tube 3〇 and the second tube 302. The lamp current sampling circuit 5 (8) applies the current of the first lamp 301 卩 and the second lamp 302 to the control/push circuit 1 。. Due to the difference in lamp impedance, such as direct parallel drive, the lamp f current will not be uniform, resulting in uneven backlight brightness and reduced lamp life. The present invention separates the driving points of the first lamp and the second lamp 302 by the electric balance circuit 4 (8) composed of the inductance and the balance % valley, and compensates the lamp with the impedance characteristic of the current balancing circuit 4 (8) at the proximity of the resonance frequency. The difference is between the lamp current balance. When the resonant frequency of the current-balanced lightning path and the working frequency of the lamp are the same, the optimal balance of the lamp can be achieved. The current balancing circuit 4 (8) shown in the first diagram is a high-voltage code that is switched to the lamp. The current balancing circuit 4 (8) shown in the figure is switched to the low voltage end of the lamp. If a double high voltage connection method, for example, a long lamp or a U-shaped lamp, is adopted, the lightning flow balancing circuit 4 (8) can be as shown in FIG. 1C. The coupling is shown at either end of the high voltage end of the lamp. The composition of the current balancing circuit 400 is as shown in FIG. 2, and is composed of five elements: a first impedance Za, a second impedance 2; 1), a third impedance Zc, a fourth impedance Zd, and a fifth impedance. Ze, wherein the first impedance Za and the second impedance are homo-type elements, and the fourth impedance Zd and the fifth impedance Ze are homo-type elements, and each impedance may be an inductance or an electric valley or a combination of an inductance and an electric valley. The five groups of impedance components _ a four-terminal 1289030 balanced packet 'passed through the first end point N1 and the second end ‘point milk connection lamp/group. The third endpoint N3 and the fourth endpoint N4 are connected to the lamp push signal. "3rd picture" is the "second 1st" transformer secondary side equivalent circuit, where & is the secondary side leakage inductance of the transformer, and the secondary side capacitance of the Zp money regulator. Za, Office, &, & 乂 and Ze* lamp officer 3〇1 and the second lamp tube are configured to form - double-end N2) RLC resonance Wei, thus change (4) 2: domain Zs and transformer & The secondary side capacitor 无 has no effect on the current balance of the first lamp tube 301 and the second lamp tube 3〇2. The balance principle of a current balancing circuit can be seen from the points of N1 and N2, and b, Zc, Zd+Ze and the lamp form a set of L C coupling resonance circuits. In the middle, the lamp is R, and the LC is composed of the first impedance Za, the second impedance zb, the third impedance Zc, the fourth impedance z仏, and the fifth impedance Ze. When the operating frequency of the control/pushing circuit (10) (ie, the operating frequency of the lamp) and the current balancing circuit 4 () are equal to each other, the ratio of A to Zb is equal to the ratio of Zd to Ze, and the first lamp Guan Guan and the second lamp will be the first impedance and the second impedance (four) inverse ratio t-light officer 3〇i current side = second lamp 3〇2 secret. If z is called Zd=Ze, the current of the first lamp and the second lamp 3〇2 will be equal in magnitude and phase, even if the impedance is greatly different. "Fig. 4" is the frequency of the lamp f current, which shows that 5GK ohms (the first ^ tube 3 and the Zuo _ two fresh ground) are in the near-level Hertz a + Zb, Z. Zc^Ze's harmonic surface is said to be equal to the money flow, the frequency of the balance F-/, (LC), L and c material scales (four) secret and capacitance values. The first implementation of the 1289030 current balancing circuit is shown in Figure 5A, where the first voltage is a combination of inductance (La, Lb) and capacitance (Ca, Cb), and the second is anti-Zc. The fourth impedance 2 (1 and the fifth impedance are capacitors (Cc, Cd,
Ce)。於實際應料，第_阻抗办、第二阻抗zb的電容可以是 ， 或含電感的圈與圈間雜散電容，第三阻抗2^可以是或含燈管高壓 引線間雜散電容。第四阻抗Zd、第五阻抗Ze可以是或含下列雜 散電容：燈管高壓㈣對地、燈管高壓引線對低壓引線、燈管高 壓端對地。此時，網路中的電感L=La+Lb，電容c==(c^ φCe). In actual application, the capacitance of the first impedance and the second impedance zb may be , or a stray capacitance between the coil and the inductor, and the third impedance 2^ may be or contain a stray capacitance between the high voltage leads of the lamp. The fourth impedance Zd and the fifth impedance Ze may be or contain the following stray capacitances: the lamp high voltage (4) to the ground, the lamp high voltage lead to the low voltage lead, and the lamp high pressure end to the ground. At this point, the inductance L=La+Lb in the network, the capacitance c==(c^ φ
Cb)/(Ca+Cb)+Cc+(CdxCe)/(Cd+Ce)。 第二貫施例讀芩考『第5B圖』，其中第一阻抗^、第二阻 仇Zb為電感、、La、Lb)與電容（Ca、Cb)組合。Za和Zb的雷 感（U、Lb)互相耦合，耦合極性要求燈管電流產生磁通方向相 反。第三阻抗Zc、第四阻抗Zd以及第五阻抗Ze為電容（&、以、Cb) / (Ca + Cb) + Cc + (CdxCe) / (Cd + Ce). The second example is to read "5B", in which the first impedance ^, the second impedance Zb is the inductance, La, Lb) and the capacitance (Ca, Cb). The lightning inductances (U, Lb) of Za and Zb are coupled to each other, and the coupling polarity requires the lamp current to be opposite to the direction of the magnetic flux. The third impedance Zc, the fourth impedance Zd, and the fifth impedance Ze are capacitances (&,
Ce) °於貫際應用時，第一阻抗Za、第二阻抗Zb的電容可以是 或含電感的圈與圈間雜散電容，第三阻抗Zc可以是或含燈管高壓 看| 引線間雜散電容。第四阻抗Zd、第五阻抗Ze可以是或含下列雜 政電容：燈管南壓引線對地、燈管高壓引線對低壓引線、燈管高 壓端對地。此時，網路中的電感L=La+Lb+2Kx，(LaxLb)，K為耦 _ 合係數，電容 C=(CaxCb)/(Ca+Cb)+Cc+(CdxCe)/，(Cd+Ce)。 . 第三實施例請參考『第5C圖』，其中第三阻抗Zc為電感(Le) 輿電容(Cc)組合。第一阻抗Za、第二阻抗Zb、第四阻抗Zd以及 10 1289030 弟五阻抗&為電容（Ca、Cb、Cd、Ce)i__ 阻抗Zc可以是或含下列雜散電容：燈管高刻線間雜容^ 感的圈與關雜散電容。第四阻抗Zd、第五阻抗&可以曰= 下列雜散電容：燈管高壓引t 疋气各Ce) ° When applied in a continuous manner, the capacitance of the first impedance Za and the second impedance Zb may be or the inter-turn stray capacitance of the inductor, and the third impedance Zc may be or include a high voltage of the lamp | stray capacitance between the leads . The fourth impedance Zd and the fifth impedance Ze may be or include the following hybrid capacitors: the lamp south lead to the ground, the lamp high voltage lead to the low voltage lead, and the lamp high end to the ground. At this time, the inductance L=La+Lb+2Kx in the network, (LaxLb), K is the coupling coefficient, and the capacitance C=(CaxCb)/(Ca+Cb)+Cc+(CdxCe)/, (Cd+Ce ). For the third embodiment, please refer to "5C", wherein the third impedance Zc is an inductance (Le) tantalum capacitor (Cc) combination. First impedance Za, second impedance Zb, fourth impedance Zd, and 10 1289030 The fifth impedance & is the capacitance (Ca, Cb, Cd, Ce) i__ The impedance Zc may be or contain the following stray capacitance: the lamp is highly engraved Between the capacitors and the stray capacitance. The fourth impedance Zd, the fifth impedance & 曰 = the following stray capacitance: the lamp high voltage leads t 疋 each
崎對地、燈官祕引線對低壓H “同h對地1時，網路中的電感此Saki to the ground, the light official secret line to the low voltage H "the same h to the ground 1, the inductance in the network
Cb)/(Ca+Cb)+Cc+(CdxCe)/(Cd+Ce) 〇 (" 本發明—射魏平衡電路的燈雜組，具有燈管〜 千_技術功效，並可降低雙燈管模組的成本。 ^ 雖然本發__之較佳實施觸露如上，㈣並非、 定本發明，任何熟習相像技藝者，在不脫離本發明之娜 内，當可作錢之更__，本㈣==關 本說明書所附之申請專利範圍所界定者為準。^乾_視 【圖式簡單說明】 第1A圖係為本發明所揭露之譜 圖，1中雷冷承, W之日日-貝不月先換紐之電路方境 μ U衡電路使用蛾管的高電壓端； 弟1Β圖係為本發明所揭 、^ ^ 圄，邊〜液晶顯示背光魅之電路大抬 ，，其中電流平衡電路使用在燈管的低健端；满方塊 翠ic圖係為本發明所揭露之 圖，其中雷产v從日日'，項不月先挺组之電路方埗 〜 电•千衡電路使用在燈管的任-高虔端； 鬼 以圖係為本發騎揭露 電路组成树； _«麵平衡 1289030 第3圖係為本發明所揭露之諧振式液晶顯示背光模組之電路第ΙΑ 圖的等效電路； 第4圖係為本發明所揭露之諧振式液晶顯示背光模組之燈管電流 的頻率嚮應； 第5Α圖係為本發明所揭露之電流平衡電路之第一實施例； 第5Β圖係為本發明所揭露之電流平衡電路之第二實施例； 第5C圖係為本發明所揭露之電流平衡電路之第三實施例； 第6Α圖為習用雙燈管模組電路結構之一：以及 第6Β圖為習用雙燈管模組電路結構之二。 【主要元件符號說明】 100控制/推動電路 200推動變壓器 300燈管 301第一燈管 302第二燈管 310燈管 320燈管 400電流平衡電路 500燈管電流取樣電路 300D1整流二極體 300D2整流二極體 1289030 310D1整流二極體 310D2整流二極體 320D1整流二極體 320D2整流二極體 310C平衡電容 320C平衡電容 R1取樣電阻 R2取樣電阻 Za第一阻抗 Zb第二阻抗 Zc第三阻抗 Zd第四阻抗 Ze第五阻抗 Zs變壓器二次側漏感 Zp變壓器二次侧電容 N1第一端點 N2第二端點 N3第三端點. N4第四端點Cb) / (Ca + Cb) + Cc + (CdxCe) / (Cd + Ce) 〇 (" The present invention - the light balance circuit of the lamp balance group, with a lamp ~ thousand technical effects, and can reduce the double lamp The cost of the module. ^ Although the preferred implementation of the present invention is as above, (4) is not, the invention, any familiar art, in the absence of the invention, when the money can be more __, this (4) == The definition of the scope of the patent application attached to this manual shall prevail. ^干_视 [Simple description of the diagram] The 1A diagram is the spectrum disclosed in the invention, 1 in Lei Lengcheng, W The day-before the moon does not change the circuit of the circuit, the U-balance circuit uses the high-voltage end of the moth tube; the brother 1Β is the invention disclosed, ^ ^ 圄, the side ~ liquid crystal display backlight charm circuit, The current balance circuit is used in the low-end of the lamp tube; the full-frame Cui ic diagram is the picture disclosed in the invention, wherein the lightning production v is from the day of the day, and the circuit of the item is not the first step of the group. The balance circuit is used in any of the high-end ends of the lamp; the ghost is based on the figure and the circuit of the circuit is exposed; _«face balance 1289030 Figure 3 is disclosed in the present invention The equivalent circuit of the circuit of the resonant liquid crystal display backlight module is shown in Fig. 4; the fourth embodiment is the frequency response of the lamp current of the resonant liquid crystal display backlight module disclosed in the present invention; The first embodiment of the disclosed current balancing circuit; the fifth embodiment is a second embodiment of the current balancing circuit disclosed in the present invention; and the fifth embodiment is a third embodiment of the current balancing circuit disclosed in the present invention; The sixth figure shows one of the circuit structures of the conventional dual lamp module: and the sixth drawing shows the circuit structure of the conventional dual lamp module. [Main component symbol description] 100 control/push circuit 200 pushes the transformer 300 lamp 301 first lamp 302 second lamp 310 lamp 320 lamp 400 current balance circuit 500 lamp current sampling circuit 300D1 rectifier diode 300D2 rectifier diode 1289030 310D1 rectifier diode 310D2 rectifier diode 320D1 rectifier two Polar body 320D2 rectifying diode 310C balancing capacitor 320C balancing capacitor R1 sampling resistor R2 sampling resistance Za first impedance Zb second impedance Zc third impedance Zd fourth impedance Ze fifth impedance Zs transformer secondary side leakage Zp transformer secondary-side capacitor first terminal N1 N2 N3 third endpoint second endpoint. N4 fourth terminal