TWI649979B - Optical signal transmission method carried out with ac led capable of light compensation - Google Patents
Optical signal transmission method carried out with ac led capable of light compensation Download PDFInfo
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Abstract
本發明係關於一種能夠進行光能補償之交流發光二極體的光訊號輸出方法，包含：以交流電源峰值出現之時間點為基準，將交流發光二極體的發光週期對稱分割成一前區及一後區；在該前區中，選擇電源峰值高的區塊作為一前半部，使該前半部的發光作為照明與選擇性的數據傳輸；在該後區中，選擇電源峰值高的區塊作為一後半部，使該後半部的發光作為照明與光能補償；以一微控制器控制該前半部與該後半部的發光方式，輸出一補償光能，使得該交流發光二極體在發光過程中能維持相同的平均照度。The present invention relates to an optical signal output method for an AC light-emitting diode capable of performing light energy compensation, comprising: symmetrically dividing an illumination period of an AC light-emitting diode into a front region based on a time point at which an AC power peak occurs; a rear region; in the front region, a block with a high power peak is selected as a front half, and the light of the first half is used as illumination and selective data transmission; in the rear region, a block with a high power peak is selected. As a second half, the illumination of the second half is compensated as illumination and light energy; and a micro-controller controls the illumination modes of the front half and the second half to output a compensation light energy, so that the AC LED is illuminated. The same average illuminance can be maintained during the process.
Description
本發明係關於一種光訊號輸出方法，尤指能夠進行光能補償之交流發光二極體的光訊號輸出方法。The present invention relates to an optical signal output method, and more particularly to an optical signal output method of an AC light-emitting diode capable of performing optical energy compensation.
中華民國發明專利公告第I411131號「控制交流發光二極體光通訊之方法」，該發明係為一種控制交流發光二極體光通訊之方法，主要目的在利用控制交流發光二極體之明區及暗區之變化而輸出光通訊訊號，其中明區為交流發光二極體發光狀態，暗區為交流發光二極體不發光狀態。其先以一交流市電相位截取電路截取一交流相位，再整合經調變之通訊訊號及交流相位訊號，而輸出調變訊號，調控交流發光二極體之亮度，藉此達成利用交流發光二極體之同步輸出光通訊訊號之功效。The Republic of China Invention Patent Bulletin No. I411131 "Method for Controlling AC Light Diode Optical Communication", which is a method for controlling AC light-emitting diode optical communication, mainly for utilizing the bright region of the control AC light-emitting diode And the change of the dark area and the output of the optical communication signal, wherein the bright area is the light-emitting diode light-emitting state, and the dark area is the AC light-emitting diode non-light-emitting state. The utility model first intercepts an AC phase by an AC mains phase intercepting circuit, integrates the modulated communication signal and the AC phase signal, and outputs a modulation signal to adjust the brightness of the AC LED, thereby achieving the use of the AC LED. The effect of synchronous output optical communication signals.
上述前案雖亦以交流發光二極體做為光通訊訊號的發射源之方法，但該案係掌控交流相位時間下，控制交流發光二極體在亮的位置或暗的位置加上調變訊號以傳送不同亮度、速率、調變形式之光通訊訊號，雖可控制亮度，但並未提出如何補償光訊號傳輸時所損失之光能，無法讓交流發光二極體在進行光訊號傳輸時仍提供相同的平均照度。Although the above-mentioned predecessor also uses the AC light-emitting diode as the emission source of the optical communication signal, the case controls the AC light-emitting diode to adjust the modulation signal in a bright position or a dark position under the control of the phase time. In order to transmit brightness of different brightness, rate and modulation type optical communication signals, it does not propose how to compensate for the lost light energy during optical signal transmission, and the AC light-emitting diode cannot be used for optical signal transmission. Provide the same average illumination.
爰此，本發明提出一種能夠進行光能補償之交流發光二極體的光訊號輸出方法，包含下列步驟：Accordingly, the present invention provides an optical signal output method for an AC light-emitting diode capable of performing optical energy compensation, comprising the following steps:
以交流電源峰值出現之時間點為基準，將交流發光二極體的發光週期對稱分割成一前區及一後區；在該前區中，選擇電源峰值高的區塊作為一前半部，使該前半部的發光作為照明與選擇性的數據傳輸；在該後區中，選擇電源峰值高的區塊作為一後半部，使該後半部的發光作為照明與光能補償；以一微控制器控制該前半部與該後半部的發光方式，其中該前半部依時間序輸出依明暗順序或依暗明順序排列的發光方式，該後半部之明暗變化與該前半部相反，且該後半部之排列順序鏡像對稱於該前半部，以輸出一補償光能，使得該交流發光二極體在發光過程中能維持相同的平均照度。Taking the time point of the peak of the AC power source as a reference, the illumination period of the AC LED is symmetrically divided into a front area and a back area; in the front area, a block with a high power peak is selected as a front half, so that the The first half of the illumination is used as illumination and selective data transmission; in the rear region, the block with the highest peak value of the power source is selected as a second half, and the illumination of the second half is compensated as illumination and light energy; controlled by a microcontroller a light-emitting manner of the front half and the second half, wherein the front half outputs a light-emitting manner in a light-dark order or a dark-light order in a time sequence, wherein a brightness change of the second half is opposite to the front half, and the rear half is arranged The sequential mirror is symmetric to the front half to output a compensated light energy such that the alternating current LED maintains the same average illumination during illumination.
其中，該前半部不需作數據傳輸時，在該前半部以高於數據傳輸速率的頻率且平均分配明暗狀態或暗明狀態。Wherein, when the first half does not need to perform data transmission, the first half is at a frequency higher than the data transmission rate and the light and dark state or the dark state is evenly distributed.
其中，該微控制器輸出一控制訊號至一開關單元，該開關單元根據該控制訊號導通或截斷交流發光二極體，以產生一明區或一暗區，該明區及該暗區係為不同單位時間之倍數，界定依明暗順序或依暗明順序排列的發光方式。The microcontroller outputs a control signal to a switch unit, and the switch unit turns on or off the AC light-emitting diode according to the control signal to generate a bright area or a dark area, wherein the bright area and the dark area are Multiples of different unit time, defining the illuminating manner in light or dark order or in dark order.
根據上述技術特徵可達成以下功效：According to the above technical features, the following effects can be achieved:
1.前半部的發光作為照明與選擇性的數據傳輸，後半部的發光作為照明與光能補償，係用以維持交流發光二極體於照明時，調節交流發光二極體於發光週期內的總輸出光能，於交流電源的每半個週期內，使其保持穩定，所形成的照度不受本身進行光訊號傳輸動作之影響，藉以提供穩定的平均照度。1. The first half of the light is used for illumination and selective data transmission, and the second half of the light is used as illumination and light energy compensation to maintain the AC light-emitting diode during illumination. The total output light energy is kept stable during each half cycle of the AC power supply, and the illuminance formed is not affected by the optical signal transmission operation itself, thereby providing a stable average illumination.
2.不需作數據傳輸時，藉由以遠高於視覺可以覺察之頻率平均分配交流發光二極體在整個發光週期的明暗狀態，除了可以繼續保持相同的平均照度，同時也避免了交流發光二極體低頻率的切換動作所可能造成視覺之光源閃爍感。2. When data transmission is not required, the AC light-emitting diodes are evenly distributed in the light-dark state of the entire illumination period at a frequency far higher than the visually perceptible frequency, in addition to maintaining the same average illumination, and avoiding the AC illumination II. The low frequency switching action of the polar body may cause the visual source to flicker.
綜合上述技術特徵，本發明能夠進行光能補償之交流發光二極體的光訊號輸出方法主要功效將可於下述實施例清楚呈現。In summary of the above technical features, the main effect of the optical signal output method of the AC light-emitting diode capable of performing light energy compensation can be clearly demonstrated in the following embodiments.
請先參閱第一圖及第二圖所示，本發明提出一種光通訊電路系統，包含：Referring to the first figure and the second figure, the present invention provides an optical communication circuit system, including:
一第一微控制器（1），電連接一供電單元（11）及一第一過零點偵測電路（12），該第一微控制器（1）用以輸出一控制訊號（13）。A first microcontroller (1) is electrically connected to a power supply unit (11) and a first zero-crossing detection circuit (12) for outputting a control signal (13).
一傳送端（2），包括一交流電源（21）及一交流發光二極體（22），該交流電源（21）串聯該交流發光二極體（22），該傳送端（2）經由一開關單元(3)間接受控於該第一微控制器（1）。a transmitting end (2) includes an alternating current power source (21) and an alternating current light emitting diode (22), the alternating current power source (21) is connected in series with the alternating current light emitting diode (22), and the transmitting end (2) is connected via a The switching unit (3) is indirectly controlled by the first microcontroller (1).
該第一過零點偵測電路（12）提供代表該交流電源(21)之零點位置出現在該交流發光二極體（22）之觸發脈波訊號，以供電路核心之該第一微控制器（1）同步各項運作時序之用。The first zero-crossing detecting circuit (12) provides a triggering pulse signal representing the zero-point position of the alternating current power source (21) on the alternating current light-emitting diode (22) for the first microcontroller of the circuit core (1) Synchronize the operation timing of each operation.
如第二圖所示，該開關單元（3）於本實施例中係為一光耦合器，該開關單元（3）更電連接一電阻（31）及一直流電源（32），該電阻（31）串聯該直流電源（32），該電阻（31）之電阻值於本實施例中係為100歐姆，該直流電源（32）於本實施例中係為5伏特。As shown in the second figure, the switch unit (3) is an optocoupler in the embodiment, and the switch unit (3) is further electrically connected to a resistor (31) and a DC power source (32). 31) The DC power source (32) is connected in series, and the resistance value of the resistor (31) is 100 ohms in this embodiment, and the DC power source (32) is 5 volts in this embodiment.
請再搭配參閱第三圖所示，一接收端（4），該接收端（4）與該傳送端（2）成對應關係配置，該接收端（4）包括一光偵測器（41）、一訊號處理單元（42）、一第二微控制器（43）及一第二過零點偵測電路（44），該光偵測器（41）於本實施例中係為一光二極體，該光偵測器（21）與該訊號處理單元（42）之間電連接一電阻（45），該電阻（45）之電阻值於本實施例中係為68K歐姆。Please refer to the third figure, a receiving end (4), the receiving end (4) is configured in correspondence with the transmitting end (2), and the receiving end (4) includes a photodetector (41). a signal processing unit (42), a second microcontroller (43), and a second zero-crossing detection circuit (44). The photodetector (41) is a photodiode in this embodiment. A resistor (45) is electrically connected between the photodetector (21) and the signal processing unit (42). The resistance of the resistor (45) is 68K ohms in this embodiment.
需特別說明的是，原本用於檢測460奈米區域附近藍光之光二極體，被採用於該接收端（4）進行二元數據資料之感應，因目前的高亮度白光二極體主要以藍光發光二極體激發黃色螢光粉而得，故在光譜上的藍光區域會有一相對較高之發光強度，有助於以該光偵測器（41）對於解讀訊號。It should be specially noted that the light diode originally used to detect the blue light near the 460 nm region is used in the receiving end (4) for binary data sensing, because the current high-brightness white light diode is mainly blue light. The light-emitting diode excites the yellow phosphor, so that the blue region of the spectrum has a relatively high luminous intensity, which helps the light detector (41) to interpret the signal.
請再搭配參閱第四圖所示，為了使光源輸出之訊號能有最大辨識度，本發明提出一種能夠進行光能補償之交流發光二極體的光訊號輸出方法，係以該交流電源（21）峰值出現之時間點為基準，圖中係以一虛線（B）為界，將該交流發光二極體（22）之一發光週期（A）對稱分割成一前區（A1）及一後區（A2）Please refer to the fourth figure. In order to maximize the recognition of the signal output from the light source, the present invention provides an optical signal output method for the AC light-emitting diode capable of performing optical energy compensation, which is the AC power supply (21). The time point at which the peak appears is the reference. The figure is divided by a broken line (B), and the illuminating period (A) of one of the alternating current illuminating diodes (22) is symmetrically divided into a front area (A1) and a rear area. (A2)
請再搭配參閱第五圖所示，在該前區（A1）中，選擇電源峰值高的區塊作為一前半部（A11），使該前半部（A11）的發光作為照明與選擇性的數據傳輸，在該後區（A2）中，選擇電源峰值高的區塊作為一後半部（A21），使該後半部（A21）的發光作為照明與光能補償。需特別說明的是，該交流發光二極體（22）發光強度隨時間變化，其中，該發光週期（A）的前後 兩端以一發光強度變化區塊（C）表示該交流發光二極體（22）之不完全發光區域（因為此時期的發光強度較弱，因此只作為照明之用，不另外用於數據的傳送），由圖可知該發光強度變化區塊（C）之發光強度有限，進行數據傳輸之辨識度較差，因此，本發明選擇在電源峰值高的該前半部（A11）傳輸數據資料。Please refer to the fifth figure. In the front area (A1), select the block with the highest power peak as the first half (A11), and make the light of the front half (A11) as the illumination and selectivity data. In the rear area (A2), a block having a high power peak is selected as a rear half (A21), and the light of the second half (A21) is compensated for illumination and light energy. It should be particularly noted that the luminous intensity of the alternating current light emitting diode (22) changes with time, wherein the front and rear ends of the light emitting period (A) are represented by a luminous intensity changing block (C). (22) Incompletely illuminating area (because the illuminating intensity of this period is weak, so it is only used for illumination, and is not used for data transmission). It can be seen from the figure that the luminous intensity of the illuminating intensity change block (C) is limited. The identification of data transmission is poor. Therefore, the present invention selects to transmit data in the first half (A11) where the peak value of the power supply is high.
請再搭配參閱第六圖所示，再藉由該第一微控制器（1）輸出該控制訊號（13）至該開關單元（3），控制該前半部（A11）輸出一光訊號（A111），該光訊號（A111）係藉由該開關單元（3）根據該控制訊號（13）導通該交流發光二極體（22），以產生一明區（A12）；或藉由該開關單元（3）截斷該交流發光二極體（22），以產生一暗區（A13），該前半部（A11）即以該明區（A12）及該暗區（A13）的排列變化，依時間序輸出依明暗順序或依暗明順序排列的發光方式輸出該光訊號（A111），前述光偵測器（41）再將該光訊號（A111）轉換為一電訊號，使該電訊號藉由該訊號處理單元（42）處理以轉換成送入該第二微控制器（43）進行判讀前的訊號（光通訊之訊號接收與轉換係為習知技術，遂不再贅述）。Please refer to the sixth figure, and then output the control signal (13) to the switch unit (3) by the first microcontroller (1), and control the front half (A11) to output an optical signal (A111). The optical signal (A111) is connected to the alternating current light emitting diode (22) according to the control signal (13) by the switching unit (3) to generate a bright area (A12); or by the switching unit (3) cutting off the alternating current light emitting diode (22) to generate a dark area (A13), the front half (A11) changing in the arrangement of the bright area (A12) and the dark area (A13), according to time The sequence output outputs the optical signal (A111) according to a light-emitting order or a light-emitting manner arranged in a dark order, and the optical detector (41) converts the optical signal (A111) into a electrical signal, so that the electrical signal is used by The signal processing unit (42) processes the signal to be converted into the second microcontroller (43) for interpretation (the signal reception and conversion of the optical communication is a conventional technique, and will not be described again).
該後半部（A21）則輸出一補償光能（A211），該補償光能（A211）之明暗變化與該前半部（A11）相反，且該後半部（A21）之排列順序鏡像對稱於該前半部（A11），係在該前半部（A11）之該明區（A12）於該後半部（A21）的對稱位置輸出該暗區（A13），在該前半部（A11）之該暗區（A13）於該後半部（A21）的對稱位置輸出該明區（A12），以輸出一補償光能，使得該交流發光二極體（22）在發光過程中能維持相同的平均照度。在該前半部（A11）所輸出該光訊號（A111），於本實施例中係傳送二進制數據資料（0011000101），而該後半部（A21）輸出之該補償光能（A211），係依據該光訊號（A111）所傳送數據資料之時序，於該後半部（A21）鏡射該前半部（A11）的發光方式，但以時序對稱且準位相反的型態產生調整位元（0101110011），以補償該前半部（A11）傳送資料位元所損失之光能。The second half (A21) outputs a compensation light energy (A211), the brightness of the compensation light energy (A211) is opposite to the front half (A11), and the arrangement order of the second half (A21) is mirror-symmetrical to the first half. a portion (A11) that outputs the dark region (A13) at a symmetrical position of the rear portion (A21) of the bright portion (A12) of the front half portion (A11), in the dark region of the front half portion (A11) ( A13) outputting the bright region (A12) at a symmetrical position of the second half (A21) to output a compensation light energy so that the alternating current light emitting diode (22) can maintain the same average illuminance during the light emission process. The optical signal (A111) is outputted in the first half (A11), in the embodiment, the binary data data (0011000101) is transmitted, and the compensated light energy (A211) outputted by the second half (A21) is based on the The timing of the data data transmitted by the optical signal (A111) is mirrored in the second half (A21) by the illumination mode of the first half (A11), but the adjustment bit (0101110011) is generated in the form of timing symmetry and opposite level. To compensate for the light energy lost by transmitting the data bit in the first half (A11).
上述方法使該交流發光二極體（22）之光源照度不受該光訊號（A111）傳輸之影響，維持相同的平均照度以得到與第七圖所示相同之曲線下面積。The above method makes the illumination of the light source of the AC LED (22) unaffected by the transmission of the optical signal (A111), maintaining the same average illumination to obtain the same area under the curve as shown in FIG.
然而，若在無需輸出數據資料時，採用第七圖所示之方式分配該發光週期（A）之該前半部（A11）及該後半部（A21）光能，形成如圖中所示之該明區（A12）及該暗區（A13），恐因該交流發光二極體（22）較長時間的「明」和「暗」狀態，低頻率的切換動作產生一閃爍訊號（A3），遂造成視覺產生光源閃爍感。However, if the data data is not required to be output, the first half (A11) and the second half (A21) of the light-emitting period (A) are distributed in the manner shown in FIG. 7 to form the image as shown in the figure. In the bright area (A12) and the dark area (A13), the low-frequency switching action produces a blinking signal (A3) due to the "light" and "dark" states of the alternating current LED (22).遂 causes a visually generated light source to flicker.
爰此，請再搭配參閱第八圖所示，在不需輸出數據資料時，以高於數據資料傳輸速率的頻率在該前半部（A11）持續切換該明區（A12）及該暗區（A13），於本實施例之排列順序係為「---1010101」，該後半部（A21）則在對應該前半部（A11）之該明區（A12）之鏡射位置輸出該暗區（A13），在對應該前半部（A11）之該暗區（A13）之鏡射位置輸出該明區（A12），於本實施例之排列順序即為「0101010---」，以平均分配該交流發光二極體（22）在整個發光週期（A）的明暗狀態，產生照度維持恆定之一平均訊號（A4）。For this reason, please refer to the eighth diagram, and when the data data is not required to be output, the bright area (A12) and the dark area are continuously switched in the first half (A11) at a frequency higher than the data data transmission rate ( A13), the arrangement order in the present embodiment is "--1010101", and the rear half (A21) outputs the dark area at the mirror position corresponding to the bright area (A12) of the front half (A11) ( A13), the bright area (A12) is outputted at a mirror position corresponding to the dark area (A13) of the first half (A11), and the order of arrangement in the embodiment is "0101010---" to evenly distribute the The AC light-emitting diode (22) produces a constant average signal (A4) in which the illuminance is maintained constant throughout the light-emitting period (A).
綜合上述實施例之說明，當可充分瞭解本發明之操作、使用及本發明產生之功效，惟以上所述實施例僅係為本發明之較佳實施例，當不能以此限定本發明實施之範圍，即依本發明申請專利範圍及發明說明內容所作簡單的等效變化與修飾，皆屬本發明涵蓋之範圍內。In view of the foregoing description of the embodiments, the operation and the use of the present invention and the effects of the present invention are fully understood, but the above described embodiments are merely preferred embodiments of the present invention, and the invention may not be limited thereto. Included within the scope of the present invention are the scope of the present invention.
（1）‧‧‧第一微控制器(1)‧‧‧First microcontroller
（11）‧‧‧供電單元(11)‧‧‧Power supply unit
（12）‧‧‧第一過零點偵測電路(12)‧‧‧First zero crossing detection circuit
（13）‧‧‧控制訊號(13)‧‧‧Control signals
（2）‧‧‧傳送端(2) ‧‧‧Transport
（21）‧‧‧交流電源(21)‧‧‧AC power supply
（22）‧‧‧交流發光二極體(22)‧‧‧AC LEDs
（3）‧‧‧開關單元(3)‧‧‧Switch unit
（31）‧‧‧電阻(31)‧‧‧Resistance
（32）‧‧‧直流電源(32)‧‧‧DC power supply
（4）‧‧‧接收端(4) ‧‧‧ receiving end
（41）‧‧‧光偵測器(41)‧‧‧Photodetector
（42）‧‧‧訊號處理單元(42) ‧‧‧Signal Processing Unit
（43）‧‧‧第二微控制器(43) ‧‧‧second microcontroller
（44）‧‧‧第二過零點偵測電路(44)‧‧‧Second zero crossing detection circuit
（45）‧‧‧電阻(45)‧‧‧Resistance
（A）‧‧‧發光週期(A) ‧ ‧ lighting cycle
（A1）‧‧‧前區(A1) ‧ ‧ front area
（A11）‧‧‧前半部(A11) ‧ ‧ the first half
（A111）‧‧‧光訊號(A111)‧‧‧Optical signal
（A12）‧‧‧明區(A12) ‧ ‧ bright area
（A13）‧‧‧暗區(A13) ‧‧ dark areas
（A2）‧‧‧後區(A2) ‧ ‧ back area
（A21）‧‧‧後半部(A21) ‧ ‧ the second half
（A211）‧‧‧補償光能(A211) ‧‧‧Compensated light energy
（A3）‧‧‧閃爍訊號(A3) ‧ ‧ flashing signal
（A4）‧‧‧平均訊號(A4) ‧ ‧ average signal
（B）‧‧‧虛線(B) ‧‧‧ dotted line
（C）‧‧‧發光強度變化區塊(C) ‧ ‧ luminous intensity change blocks
[第一圖]係本發明實施例之光通訊電路系統示意圖。[First figure] is a schematic diagram of an optical communication circuit system according to an embodiment of the present invention.
[第二圖]係本發明實施例之以光耦合器實現開關單元示意圖。[Second diagram] A schematic diagram of a switching unit implemented by an optical coupler in the embodiment of the present invention.
[第三圖]係本發明實施例之接收端示意圖。[Third Figure] is a schematic diagram of a receiving end of an embodiment of the present invention.
[第四圖]係本發明實施例以該交流電源峰值出現之時間點為基準，將發光週期對稱分割成前區及後區示意圖。[Fourth Diagram] In the embodiment of the present invention, the illumination period is symmetrically divided into the front region and the rear region based on the time point at which the peak of the AC power source appears.
[第五圖]係本發明實施例之發光週期對稱區分成前半部及後半部示意圖。[Fifth Diagram] A schematic diagram in which the illumination period of the embodiment of the present invention is symmetrically divided into the front half and the second half.
[第六圖]係本發明實施例之輸出光訊號及補償光能示意圖。[Sixth Graph] is a schematic diagram of output optical signals and compensated light energy according to an embodiment of the present invention.
[第七圖]係本發明實施例不需輸出數據資料時，前述補償方式將產生光源閃爍的明暗訊號示意圖。[Seventh figure] In the embodiment of the present invention, when the data data is not required to be output, the foregoing compensation method will generate a light and dark signal diagram of the light source blinking.
[第八圖]係本發明實施例在不需輸出光訊號時，輸出平均訊號以平均分配整個發光週期明暗狀態的示意圖。[Eighth image] is a schematic diagram of the embodiment of the present invention, when an optical signal is not required to be output, and the average signal is output to evenly distribute the light and dark state of the entire lighting period.
Claims (3)
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| TW105127896A TWI649979B (en) | 2016-08-30 | 2016-08-30 | Optical signal transmission method carried out with ac led capable of light compensation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1637825A (en) * | 2003-12-29 | 2005-07-13 | Lg.菲利浦Lcd株式会社 | Method and apparatus for driving liquid crystal display |
| CN102422573A (en) * | 2009-04-28 | 2012-04-18 | 西门子公司 | Method and apparatus for the optical transmission of data |
| TWI439178B (en) * | 2010-05-05 | 2014-05-21 | Fenq Lin Jenq | Method of controlling ac led output colour temperature and luminance |
| CN103822116A (en) * | 2013-12-31 | 2014-05-28 | 苏州佳世达光电有限公司 | Light source module and lighting control method |
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2016
- 2016-08-30 TW TW105127896A patent/TWI649979B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1637825A (en) * | 2003-12-29 | 2005-07-13 | Lg.菲利浦Lcd株式会社 | Method and apparatus for driving liquid crystal display |
| CN102422573A (en) * | 2009-04-28 | 2012-04-18 | 西门子公司 | Method and apparatus for the optical transmission of data |
| TWI439178B (en) * | 2010-05-05 | 2014-05-21 | Fenq Lin Jenq | Method of controlling ac led output colour temperature and luminance |
| CN103822116A (en) * | 2013-12-31 | 2014-05-28 | 苏州佳世达光电有限公司 | Light source module and lighting control method |
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