200924564 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種白光系統之驅動方法，特別係關於一 種藉由控制一輔助光源之開啟動作而控制白光系統之功效 消耗及發光特性的驅動方法。 【先前技術】 使用發光二極體（Light Emitting Diode，LED )構成之 光源具備「高細腻度」、「高輝度」、「無水銀」、「高 色再現性」及「省空間」等特點，因而能夠賦予許多需要 光源之電子產品（例如液晶面板）更高的附加價值。隨著平面 電視逐漸受到消費者青睞而逐漸有取代映像管電視成為主 流之際，相關業者也希望尋找色彩表現更佳的背光源，其 中lx光一極體由於能夠呈現更光党的色澤（c〇i〇r gamma)且 具有使用壽命更長的優點，因而在平面電視的發展上深受 觀注。 美國專利US 6,680,588揭示一種白光系統，其利用冷陰極 燈管（cold cathode fluorescent lamp，CCFL· )產生白光， 並利用FBI與FB2二個回饋電路偵測之輸出電流，控制 CCFL之電源’而達到白光系統的穩定性。 美國專利US 7,067,995亦揭示一種白光系統，其利用多組 的RGB發光二極體（LED)陣列來逹到一樣的光強度與色溫 座標。然而，US 7,067,995揭示之白光系統在發光二極體製 作成本與控制電路的控制接腳上皆相當昂貴與複雜。 美國專利US 6,943,770揭示另一種白光系統，其利用冷陰BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a white light system, and more particularly to a driving method for controlling power consumption and light emitting characteristics of a white light system by controlling an opening action of an auxiliary light source. . [Prior Art] Light sources made of Light Emitting Diodes (LEDs) are characterized by "high detail", "high brightness", "anhydrous silver", "high color reproducibility" and "saving space". Therefore, it is possible to impart a higher added value to many electronic products (such as liquid crystal panels) that require a light source. As flat-panel TVs are gradually favored by consumers and gradually replace the image tube TV as the mainstream, the relevant industry also hopes to find a backlight with better color performance, in which the lx light pole can present a more brilliant color (c〇 I〇r gamma) has the advantage of longer service life and is therefore highly regarded in the development of flat-panel TVs. U.S. Patent No. 6,680,588 discloses a white light system which uses a cold cathode fluorescent lamp (CCFL) to generate white light and uses the FBI and FB2 two feedback circuits to detect the output current to control the CCFL power supply to achieve white light. System stability. U.S. Patent No. 7,067,995 also discloses a white light system that utilizes multiple sets of RGB light emitting diode (LED) arrays to achieve the same light intensity and color temperature coordinates. However, the white light system disclosed in US 7,067,995 is quite expensive and complicated in the control pin of the cost and control circuit of the light emitting diode. U.S. Patent No. 6,943,770 discloses another white light system that utilizes cold shade
125527.DOC -6 - 200924564 極燈管（CCFL)與發光二極體（LED)互相搭配來達到所需白 光色溫座標。 【發明内容】 本發明提供一種藉由控制一輔助光源之開啟動作而控制 白光系統之功效消耗及發光特性的驅動方法。 本發明之白光系統之驅動方法首先根據一主要光源之輸 出值與一參考值計算一輔助光源的開啟時間（DTi)。其次， 設定一訊框時間（FT)及一單元時間（UT)，並計算該訊框時 間可容納之單元時間的個數（M)。之後，根據一輔助光源之 開啟時間（DTi)及該單元時間（UT)，計算該輔助光源之開啟 次數（Ni)及補償時間（CTiV最後，根據該開啟次數（Ν〇及補 償時間（CTi)，驅動該輔助光源發出光束。 本發明係根據一主要光源之輸出值與一參考值計算一輔 助光源的開啟時間（DTi)，將該辅助光源之各發光模組的開 啟時間細分成N個單元時間（UT)及一補償時間，並在該訊框 知間執行該N個單元時間（UT)。若該訊框時間不足以執行該 N個單元時間，則使用該補償時間予以補足。如此 本發明即可藉由控制輔助光源之開啟動作而控制該白光系 統之功效消耗及發光特性（例如色溫或亮度）。 【實施方式】 圖1例示本發明之白光系統1〇。該白光系統包含一用以產 生控制訊號之微處理器12、一電源供應器14、一白光光源 20、一根據該控制訊號導通該電源供應器丨4之電流而驅動 忒白光光源20之白光驅動器22、一辅助光源丨6、複數個根125527.DOC -6 - 200924564 The polar light tube (CCFL) and the light-emitting diode (LED) are matched to each other to achieve the desired white color temperature coordinates. SUMMARY OF THE INVENTION The present invention provides a driving method for controlling power consumption and illuminating characteristics of a white light system by controlling an opening operation of an auxiliary light source. The driving method of the white light system of the present invention first calculates the turn-on time (DTi) of an auxiliary light source based on the output value of a primary light source and a reference value. Next, set a frame time (FT) and a unit time (UT), and calculate the number of unit time (M) that can be accommodated in the frame time. Then, according to the opening time (DTi) of the auxiliary light source and the unit time (UT), the number of times (Ni) and the compensation time of the auxiliary light source are calculated (CTiV, finally, according to the number of times of opening (Ν〇 and compensation time (CTi)) The auxiliary light source is driven to emit a light beam. The invention calculates an opening time (DTi) of an auxiliary light source according to an output value of a main light source and a reference value, and subdivides the opening time of each of the auxiliary light sources into N units. Time (UT) and a compensation time, and the N unit time (UT) is executed between the frames. If the frame time is not enough to execute the N unit time, the compensation time is used to make up. The invention can control the power consumption and the light-emitting characteristics (such as color temperature or brightness) of the white light system by controlling the opening action of the auxiliary light source. [Embodiment] FIG. 1 illustrates a white light system 1 of the present invention. The white light system includes one use. The microprocessor 12 for generating a control signal, a power supply 14, a white light source 20, and a current driven by the control signal to turn on the power supply 丨4 22, an auxiliary light source Shu 6, a plurality of white root white light source driver 20 of the
125527.DOC -7- 200924564 據該控制訊號導通該電源供應器14之電流而驅動該輔助光 源16之輔助驅動器18、一可根據一感測單元3〇之感測訊號 而產生一回饋訊號之訊號調整器24。 該感測單元30包含一電流感測器30A、一色彩感測器3〇B 以及度感測器3 0 C ’用以產生感測訊號至該訊號調整器 24。該微處理器22包含一可將該回饋訊號轉換為數位訊號 之類比/數位轉換器22A以及一可將數位訊號轉換為類比訊 號之數位/類比轉換器22B，而一顯示裝置26則用以顯示該 數位/類比轉換器22B輸出之類比訊號。該微處理器22係藉 由一控制訊號產生器28A產生一控制訊號（脈寬調制電壓訊 號）至該白光驅動器22，並利用一控制訊號產生器28B產生 一輔助控制訊號至該輔助驅動器1 8。 圖2例示本發明第一實施之白光系統1〇之驅動方法。首先 根據該白光光源20之輸出值（亦即該感測單元3〇產生之色 溫、亮度、或電流值）與一參考值產生一誤差值，並根據該 誤差值計算該輔助光源1 6之複數個發光模組16A、16B及 16C的開啟時間（DTi)。其次，設定一訊框時間（ρτ)及一單 元時間（UT) ’再根據公式m=FT/(PxUT)計算該訊框時間可 容納之單元時間的個數（M)。之後，根據該輔助光源16之複 數個發光模組16A、16B及16C的開啟時間（DTi)及該單元時 間（UT) ’計算該複數個發光模組16A、16B及16C之開啟次 數（Ni)及補償時間（CTih最後，根據該開啟次數（Ni)及補償 時間（CTi) ’驅動該輔助光源16之複數個發光模組16A、16B 及16C發出光束。125527.DOC -7- 200924564 The auxiliary driver 18 driving the auxiliary light source 16 according to the current of the control signal to turn on the current of the power supply 14 , a signal capable of generating a feedback signal according to the sensing signal of the sensing unit 3 Adjuster 24. The sensing unit 30 includes a current sensor 30A, a color sensor 3〇B, and a degree sensor 3 0 C ' for generating a sensing signal to the signal adjuster 24. The microprocessor 22 includes an analog/digital converter 22A that converts the feedback signal into a digital signal and a digital/analog converter 22B that converts the digital signal into an analog signal, and a display device 26 displays The digital/analog converter 22B outputs an analog signal. The microprocessor 22 generates a control signal (pulse width modulation voltage signal) to the white light driver 22 by a control signal generator 28A, and generates an auxiliary control signal to the auxiliary driver 18 by using a control signal generator 28B. . Fig. 2 is a view showing a driving method of the white light system 1 of the first embodiment of the present invention. First, an error value is generated according to an output value of the white light source 20 (that is, a color temperature, a brightness, or a current value generated by the sensing unit 3 与) and a reference value, and the plurality of auxiliary light sources 16 are calculated according to the error value. The turn-on time (DTi) of the light-emitting modules 16A, 16B and 16C. Next, a frame time (ρτ) and a cell time (UT) are set to calculate the number of unit times (M) that the frame time can accommodate according to the formula m=FT/(PxUT). Then, the number of times (Ni) of the plurality of light-emitting modules 16A, 16B, and 16C is calculated according to the opening time (DTi) of the plurality of light-emitting modules 16A, 16B, and 16C of the auxiliary light source 16 and the unit time (UT)' And the compensation time (CTih finally, a plurality of light-emitting modules 16A, 16B, and 16C that drive the auxiliary light source 16 emit light beams according to the number of times of opening (Ni) and the compensation time (CTi).
125527.DOC 200924564 P係正整數，代表該輔助光源16之發光模組的個數，此 一貫施例包含三個發光模組丨6A、丨6B及1 6C，故P=3。該發 光模組16A可由藍光二極體構成，該發光模組16B可由綠光 發光二極體構成，該發光模組16C可由紅光發光二極體構成 。特而έ之，P可大於或等於3，例如使用二個綠光發光模 組、一個藍光發光模組及一個紅光發光模組，則ρ=4。 s亥複數個發光模組16Α、16Β及16C之開啟次數（Ni)及補償 時間（CTi)之計算程序首先根據公式Ni=DTi/UT計算該複數 個發光模組16A、16B及16C之開啟次數（Ni)。其次，檢查Μ 疋否大於該複數個Ni之最大值，若檢查結果為真，則設定 該複數個發光模組16A、16B及16C之補償時間（CTi)為零； 若檢查結果為否且Μ大於等於Ni，則設定該補償時間（CTi) 為零’若檢查結果為否且Μ小於Ni，則根據公式CTi=(Ni-M) xUT設定該補償時間。 圖3例示本發明第二實施之白光系統1〇之驅動方法。圖2 及圖3揭示之實施例差異為該複數個發光模組16A、16]3及 16C之開啟次數（Ni)及補償時間（CTi)之計算程序不同。參考 圖3 ’該複數個發光模組16A、16B及16C之開啟次數（Ni)及 補償時間（CTi)之計算流程，首先執行步驟⑷根據公式 Ni=DTi/UT計算一發光模組之開啟次數（Ni)。其次’執行步 驟（b)若Μ大於等於Ni則設定該發光模組之補償時間（CTi) 為零；若Μ小於Ni則根據公式CTi=(Ni-M)xUT設定該發光模 組之補償時間。之後，重覆步驟（a)及（b)—預定次數，直到 i=P，即完成該複數個發光模組16A、16B及16C之開啟次數125527.DOC 200924564 P is a positive integer representing the number of light-emitting modules of the auxiliary light source 16. The conventional embodiment includes three light-emitting modules 丨6A, 丨6B and 16C, so P=3. The light-emitting module 16A can be composed of a blue light-emitting diode, and the light-emitting module 16B can be composed of a green light-emitting diode. The light-emitting module 16C can be composed of a red light-emitting diode. Specifically, P can be greater than or equal to 3, for example, using two green light emitting modules, one blue light emitting module, and one red light emitting module, then ρ=4. The calculation procedure of the number of times of opening (Ni) and the compensation time (CTi) of the plurality of light-emitting modules 16 Α, 16 Β and 16 C is calculated by first calculating the number of times of opening of the plurality of light-emitting modules 16A, 16B and 16C according to the formula Ni=DTi/UT (Ni). Next, the check Μ 大于 is greater than the maximum value of the plurality of Ni. If the check result is true, the compensation time (CTi) of the plurality of light-emitting modules 16A, 16B, and 16C is set to zero; if the check result is no and Μ If the value is greater than or equal to Ni, the compensation time (CTi) is set to zero. If the result of the check is no and Μ is less than Ni, the compensation time is set according to the formula CTi=(Ni-M) xUT. Fig. 3 is a view showing a driving method of the white light system 1 of the second embodiment of the present invention. The difference between the embodiment disclosed in FIG. 2 and FIG. 3 is that the calculation procedures of the number of times of opening (Ni) and the compensation time (CTi) of the plurality of light-emitting modules 16A, 16]3 and 16C are different. Referring to FIG. 3, the calculation procedure of the number of times (Ni) and the compensation time (CTi) of the plurality of light-emitting modules 16A, 16B, and 16C is first performed by step (4) calculating the number of times of opening of a light-emitting module according to the formula Ni=DTi/UT. (Ni). Secondly, 'execution step (b), if Μ is greater than or equal to Ni, the compensation time (CTi) of the illuminating module is set to zero; if Μ is less than Ni, the compensation time of the illuminating module is set according to the formula CTi=(Ni-M)xUT . Thereafter, steps (a) and (b) are repeated for a predetermined number of times until i=P, that is, the number of times of opening the plurality of light-emitting modules 16A, 16B, and 16C is completed.
I25527.DOC 200924564 (Ni)及補償時間（CTi)之計算。 參考圖4及圖5，本發明係將各發光模組之開啟冑間（即責 任時間，duty time)細分成N個單元時間（υτ)及—補償時間 (CT)。若Μ個單元日夺間（υτ)之加總小於各發光模组之開^ 時間，即Μ小於Ν，則使用該補償時間（CT)予以補足。特而 言之，各發光模組之開啟時間等於訊框時間内之單元時間 總和加上補償時間。圖4例示各發光模組之開啟時間相同， 亦即專於5個早元時間之總和加上補償時間。 如此，該驅動器18在該訊框時間内僅導通該電源供應器Calculation of I25527.DOC 200924564 (Ni) and compensation time (CTi). Referring to Figures 4 and 5, the present invention subdivides the turn-on time (i.e., duty time) of each lighting module into N unit times (υτ) and compensation time (CT). If the sum of the unit 日 υ (υτ) is less than the opening time of each illuminating module, that is, Μ is less than Ν, the compensation time (CT) is used to make up. In particular, the turn-on time of each light-emitting module is equal to the sum of the unit time in the frame time plus the compensation time. FIG. 4 illustrates that the opening times of the respective lighting modules are the same, that is, the sum of the five early time times plus the compensation time. Thus, the driver 18 only turns on the power supply during the frame time.
14之電流至該二個發光模組丨6a、16B及16C之一，m ^ W 口而該 電源供應器14在該訊框時間内之供應電流為一定值，且該 電源供應器14在該補償時間（CT)内之供應電流亦為—定值 (lBlue + lGreen + IRed)，亦即該電源供應器14輪出準定電流，士 圖4所示。相對地，若M個單元時間（υτ)之加總大於等於^ 發光模組之開啟時間，即Μ大於等，則不需使用補償時 間（ct)，故設為零。如此，該電源供應器14在該訊框時間 内之供應電流為一定值，且該電源供應器14在該補償時間 (ct)内之供應電流為零，亦即該電源供應器14輸出準定電 流，因而可有效地降低驅動發光元件之電功率，如圖5所示 〇 圖6例不本發明之白光系統1〇的驅動訊號波形圖。本發明 係將各發光模組之開啟時間（即責任時間，duty time)細分成 N個單元時間（UT)及一補償時間。該發光模組丨6A(藍光二極 體）之開啟時間較長，訊框時間内之單元時間加總仍小於竽 125527.DOC -10- 200924564 開啟時間，故使用補償時間予以補足。相對地，該發光模 組16B(綠光發光二極體）及該發光模組i6c(紅光發光二極 體）之開啟時間較短，小於訊框時間内之單元時間加總，故 補償時間設為零。 圖7利用CIE色彩座標系統比較本發明之白光系統與習知 技藝之白光系統。CIE色彩座標系統利用顏色之紅（R)、 綠（G )和藍（B )三原色光之相對應數值來確定顏色。習 知技藝之白光系統可產生之光線的座標明顯地小於本發明 之白光系統可產生之光線的座標，亦即’本發明之白光系 統可產生之光線範圍遠大於習知技藝之白光系統。 特而言之’假設圖1之色溫感測器30B感測該白光光源2〇 產生之色溫為2000k，則該微處理器22將該色溫值與一參考 值（例如4500k)比較而產生一誤差值，並根據該誤差值計算 該輔助光源16之複數個發光模組16A、16B及16C的開啟時 間（DTi)。之後，根據該輔助光源16之複數個發光模組ι6Α 、16B及16C的開啟時間（DTi)及該單元時間（UT)，計算該複 數個發光模組16A、16B及16C之開啟次數（Ni)及補償時間 (CTi)，而該輔助驅動器18再根據該開啟次數（Ni)及補償時 間（CTi) ’驅動該輔助光源16之複數個發光模組16A、16B及 16C發出光束，使得該白光系統20之整體輸出色溫為該參考 值，即 4500k。 本發明係根據一主要光源之輸出值與一參考值計算—輔 助光源的開啟時間（DTi)，將該辅助光源之各發光模組的開 啟時間細分成N個單元時間（UT)及一補償時間，並在該訊框 I25527.DOC -11- 200924564 時間執行該N個單元時間（UT)。若該訊框時間不足以執行該 Ν個單元時間（UT)，則使用該補償時間（CT)予以補足。如此 本發明即可藉由控制輔助光源之開啟動作而控制白光系統 之色溫及亮度。 本發明之技術内容及技術特點已揭示如上，然而熟悉本 項技術之人士仍可能基於本發明之教示及揭示而作種種不 背離本發明精神之替換及修飾。因此，本發明之保護範圍 應不限於實施例所揭示者’而應包括各種不背離本發明之 替換及修飾，並為以下之申請專利範圍所涵蓋。 【圖式簡要說明】 圖1例示本發明之白光系統； 圖2例示本發明第一實施之白光系統之驅動方法； 圖3例示本發明第二實施之白光系統之驅動方法； 圖4及圖5例示本發明之驅動訊號波形圖； 圖6例示本發明之白光系統的驅動訊號波形圖；以及 圖7利用CIE色彩座標系統比較本發明之白光系統與習知 技藝之白光系統。 【主要元件符號說明】 1 〇 光源 14 電源供應器 16 辅助光源 16A發光模組 16B發光模組 16C發光模組The current of 14 is one of the two light-emitting modules 丨6a, 16B and 16C, m ^ W, and the supply current of the power supply 14 during the frame time is a certain value, and the power supply 14 is The supply current in the compensation time (CT) is also - set value (lBlue + lGreen + IRed), that is, the power supply 14 turns out the quasi-set current, as shown in Figure 4. In contrast, if the sum of the M unit times (υτ) is greater than or equal to the opening time of the illuminating module, that is, Μ is greater than or equal to, the compensation time (ct) is not required, so it is set to zero. In this way, the supply current of the power supply 14 during the frame time is a certain value, and the supply current of the power supply 14 within the compensation time (ct) is zero, that is, the power supply 14 outputs the calibration. The current can thus effectively reduce the electric power of the driving light-emitting element, as shown in Fig. 5, which is a driving signal waveform diagram of the white light system 1 of the present invention. The invention divides the opening time (ie duty time) of each lighting module into N unit time (UT) and a compensation time. The illumination module 丨6A (blue LED) has a longer turn-on time, and the unit time of the frame time is still less than the 竽 125527.DOC -10- 200924564 turn-on time, so the compensation time is used to make up. In contrast, the light-emitting module 16B (green light-emitting diode) and the light-emitting module i6c (red light-emitting diode) have a shorter opening time, which is less than the unit time of the frame time, so the compensation time Set to zero. Figure 7 compares the white light system of the present invention with the conventional white light system using the CIE color coordinate system. The CIE color coordinate system uses the corresponding values of the three primary colors of color red (R), green (G), and blue (B) to determine the color. The white light system of the prior art can produce coordinates that are significantly smaller than the coordinates of the light that can be produced by the white light system of the present invention, i.e., the white light system of the present invention can produce a light range that is much larger than conventional white light systems. In particular, if the color temperature sensor 30B of FIG. 1 senses that the color temperature generated by the white light source 2 is 2000 k, the microprocessor 22 compares the color temperature value with a reference value (for example, 4500 k) to generate an error. And calculating an on time (DTi) of the plurality of illumination modules 16A, 16B, and 16C of the auxiliary light source 16 according to the error value. Then, based on the turn-on time (DTi) of the plurality of light-emitting modules ι6 Α , 16B and 16C of the auxiliary light source 16 and the unit time (UT), the number of times (Ni) of the plurality of light-emitting modules 16A, 16B and 16C is calculated. And the compensation time (CTi), and the auxiliary driver 18 emits a light beam by driving the plurality of light-emitting modules 16A, 16B and 16C of the auxiliary light source 16 according to the number of times of opening (Ni) and the compensation time (CTi), so that the white light system The overall output color temperature of 20 is the reference value, which is 4500k. The invention calculates the turn-on time (DTi) of the auxiliary light source according to the output value of a main light source and a reference value, and subdivides the turn-on time of each light-emitting module of the auxiliary light source into N unit time (UT) and a compensation time. And execute the N unit time (UT) at the time frame I25527.DOC -11- 200924564. If the frame time is not sufficient to perform the unit time (UT), the compensation time (CT) is used to make up. Thus, the present invention can control the color temperature and brightness of the white light system by controlling the opening action of the auxiliary light source. The technical contents and technical features of the present invention have been disclosed as above, and those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is not to be construed as limited by the scope of BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates a white light system of the present invention; Fig. 2 illustrates a driving method of a white light system according to a first embodiment of the present invention; and Fig. 3 illustrates a driving method of a white light system according to a second embodiment of the present invention; Figs. 4 and 5 The driving signal waveform diagram of the present invention is illustrated; FIG. 6 illustrates a driving signal waveform diagram of the white light system of the present invention; and FIG. 7 compares the white light system of the present invention with the conventional white light system using the CIE color coordinate system. [Main component symbol description] 1 〇 Light source 14 Power supply 16 Auxiliary light source 16A light module 16B light module 16C light module
125527.DOC -12- 200924564 18 驅動器 20 白光光源 22 微處理器 22A類比/數位轉換器 22B數位/類比轉換器 24 訊號調整器 26 顯示裝置 28A控制訊號產生器 28B控制訊號產生器 30 感測單元 30A電流感測器 30B 色溫感測器 30C溫度感測器 125527.DOC -13125527.DOC -12- 200924564 18 Driver 20 White light source 22 Microprocessor 22A analog/digital converter 22B digital/analog converter 24 Signal adjuster 26 Display device 28A Control signal generator 28B Control signal generator 30 Sensing unit 30A Current Sensor 30B Color Temperature Sensor 30C Temperature Sensor 125527.DOC -13