TWI394116B - Method of driving a lamp of a backlight source for improving the luminance response - Google Patents
Method of driving a lamp of a backlight source for improving the luminance response Download PDFInfo
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- TWI394116B TWI394116B TW97144871A TW97144871A TWI394116B TW I394116 B TWI394116 B TW I394116B TW 97144871 A TW97144871 A TW 97144871A TW 97144871 A TW97144871 A TW 97144871A TW I394116 B TWI394116 B TW I394116B
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Description
本發明係相關於一種驅動背光源之燈管之方法，尤指一種改善亮度反應之驅動背光源之燈管之方法。The present invention relates to a method of driving a lamp of a backlight, and more particularly to a method of driving a lamp of a backlight that improves brightness response.
由於一般液晶顯示器之背光模組是採用整面式點亮的背光源，亦即背光源的亮度保持固定且不會隨著時間而有所變動，因此容易有動態模糊(Motion blur)的現象，於是掃描式背光之液晶顯示器便衍生而出。請參考第1圖，第1圖為先前技術之掃描式背光之液晶顯示器的示意圖。液晶顯示面板110包含有三個掃描區塊112、114、116，而每一個掃描區塊各包含有作為背光源的燈管120。先前技術之掃描式背光之液晶顯示器的驅動方式如下：在第一驅動時段，掃描區塊112所相對應的燈管120a以及120b關閉，其餘燈管均點亮；在第二驅動時段，掃描區塊114所相對應的燈管120c以及120d關閉，其餘燈管均點亮；在第三驅動時段，掃描區塊116所相對應的燈管120e以及120f關閉，其餘燈管均點亮；之後再重複以上燈管點亮及關閉的順序。對每一個掃描區塊而言，其顯示方式就如同插入一黑畫面，因此可以降低動態模糊的現象。Since the backlight module of a general liquid crystal display is a backlight that uses a full-surface illumination, that is, the brightness of the backlight remains fixed and does not change with time, it is easy to have a motion blur phenomenon. Then the liquid crystal display of the scanning backlight is derived. Please refer to FIG. 1 , which is a schematic diagram of a prior art scanning backlight liquid crystal display. The liquid crystal display panel 110 includes three scanning blocks 112, 114, 116, and each of the scanning blocks each includes a lamp tube 120 as a backlight. The driving method of the prior art scanning backlight liquid crystal display is as follows: in the first driving period, the corresponding lamps 120a and 120b of the scanning block 112 are turned off, and the remaining lamps are lit; in the second driving period, the scanning area The corresponding lamps 120c and 120d of the block 114 are closed, and the remaining lamps are illuminated; in the third driving period, the corresponding lamps 120e and 120f of the scanning block 116 are closed, and the remaining lamps are illuminated; Repeat the order in which the above lamps are lit and turned off. For each scan block, it is displayed in the same way as a black screen, thus reducing the phenomenon of dynamic blur.
請參考第2圖，第2圖為先前技術之掃描式背光之訊號之波形圖。圖中訊號S1表示背光的控制訊號，D為訊號S1責任週期， F為訊號S1的頻率，訊號IL表示燈管的操作電流，訊號LS表示燈管的亮度，Tr為亮度上升時間，Tf為亮度下降時間。訊號S1用來控制背光的開啟及關閉，而背光開啟及關閉的時間比則由責任週期D所決定。當訊號S1開啟背光時，燈管用需要經過時間Tr才能到達穩定的亮度，當訊號S1關閉背光時，燈管用需要經過時間Tf才能完全的暗下來，由於燈管所需的亮度上升時間與亮度下降時間較長，使得改善動態模糊的效果受到限制。Please refer to FIG. 2, which is a waveform diagram of the signal of the prior art scanning backlight. In the figure, the signal S1 indicates the control signal of the backlight, and D is the duty cycle of the signal S1. F is the frequency of the signal S1, the signal IL indicates the operating current of the lamp, the signal LS indicates the brightness of the lamp, Tr is the brightness rise time, and Tf is the brightness fall time. The signal S1 is used to control the opening and closing of the backlight, and the time ratio of the backlight to be turned on and off is determined by the duty cycle D. When the signal S1 turns on the backlight, the lamp needs to pass the time Tr to reach a stable brightness. When the signal S1 turns off the backlight, the lamp needs to pass the time Tf to completely darken, because the brightness rise time required by the lamp is The brightness reduction time is long, so that the effect of improving the motion blur is limited.
綜上所述，掃描式背光之液晶顯示器的驅動方式，燈管120並不會同時全部開啟，因此液晶顯示器的整體亮度會比整面式點亮液晶顯示器低。以第1圖所示，應用掃描式背光之液晶顯示器的整體亮度約為整面式點亮液晶顯示器的1/3，而且燈管的消耗功率也是約為整面式點亮液晶顯示器的1/3。為了解決掃描式背光之液晶顯示器整體亮度下降的問題，可以將燈管120的亮度調升以提高液晶顯示器的整體亮度，然而，因為調升燈管120的亮度需要將燈管工作在更高的電氣條件下(例如更大的燈管電流)，因此燈管的壽命將會明顯降低。In summary, the driving mode of the liquid crystal display of the scanning backlight, the lamp 120 is not fully turned on at the same time, so the overall brightness of the liquid crystal display is lower than that of the full-surface lighting liquid crystal display. As shown in Fig. 1, the overall brightness of the liquid crystal display using the scanning backlight is about 1/3 of that of the full-surface lighting liquid crystal display, and the power consumption of the lamp is also about 1/1 of the full-surface lighting liquid crystal display. 3. In order to solve the problem that the overall brightness of the liquid crystal display of the scanning backlight is lowered, the brightness of the lamp 120 can be raised to improve the overall brightness of the liquid crystal display. However, since the brightness of the lamp 120 is adjusted, the lamp needs to be operated at a higher level. Under electrical conditions (such as larger lamp currents), the life of the lamp will be significantly reduced.
因此，本發明之一目的在於提供一種改善亮度反應之驅動背光源之燈管之方法，以解決上述之問題。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of improving a brightness response driving a lamp of a backlight to solve the above problems.
本發明係提供一種改善亮度反應時間之驅動燈管之方法。該 方法包含提供一操作電流以將該背光源之燈管之亮度由一第一亮度調整為一第二亮度；於該背光源之燈管之亮度未達到該第二亮度之一預定期間內，調整該操作電流以使該背光源之燈管之亮度在短時間內達到該第二亮度。The present invention provides a method of driving a lamp tube that improves brightness response time. The The method includes providing an operating current to adjust a brightness of the light source of the backlight from a first brightness to a second brightness; adjusting the brightness of the light source of the backlight to a predetermined period of the second brightness The operating current is such that the brightness of the lamp of the backlight reaches the second brightness in a short time.
在說明書及後續的申請專利範圍當中使用了某些詞彙來指稱特定的元件。所屬領域中具有通常知識者應可理解，製造商可能會用不同的名詞來稱呼同樣的元件。本說明書及後續的申請專利範圍並不以名稱的差異來作為區別元件的方式，而是以元件在功能上的差異來作為區別的基準。在通篇說明書及後續的請求項當中所提及的「包含」係為一開放式的用語，故應解釋成「包含但不限定於」。此外，「電性連接」一詞在此係包含任何直接及間接的電氣連接手段。因此，若文中描述一第一裝置電性連接於一第二裝置，則代表該第一裝置可直接連接於該第二裝置，或透過其他裝置或連接手段間接地連接至該第二裝置。Certain terms are used throughout the description and following claims to refer to particular elements. It should be understood by those of ordinary skill in the art that manufacturers may refer to the same elements by different nouns. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the differences in the functions of the elements as the basis for the distinction. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "electrical connection" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is electrically connected to a second device, it means that the first device can be directly connected to the second device or indirectly connected to the second device through other devices or connection means.
請參考第3圖，第3圖為本發明驅動背光源之燈管之方法之第一實施例之示意圖。一般背光源之螢光燈管包含熱陰極螢光燈管(hot cathode fluorescent lamp,HCFL)及冷陰極螢光燈管(cold cathode fluorescent lamp,CCFL)。以冷陰極螢光燈管為例，由相對亮度90%下降至10%約3ms，由相對亮度10%上升至90%約3ms，由相對亮度100%下降至0%約10ms，由相對亮度0%上升 至100%約10ms。由於螢光燈管所需的亮度上升時間與亮度下降時間較長，當螢光燈管用於液晶顯示器之掃描式背光之插黑技術時，改善動態模糊的效果有限。本發明驅動背光源之燈管之方法可加快背光源之燈管之亮度反應時間，進而改善液晶顯示器之掃描式背光之插黑效果。如第3圖所示，訊號S1表示背光的控制訊號，訊號IL表示燈管的操作電流，訊號LS表示燈管的亮度。在本實施例中，當背光源之燈管開啟時，提高燈管的操作電流，以縮短背光源之燈管的亮度反應時間。控制訊號S1為責任週期50%之時脈訊號，當控制訊號S1為高準位時背光源之燈管開啟，當控制訊號S1為低準位時背光源之燈管關閉。背光源之燈管在亮度值La的操作電流值為Ia，在開啟背光源之燈管後，為了縮短背光源之燈管到達亮度值La的時間，在Tr1期間將燈管的操作電流值提高至Ib，因此背光源之燈管的亮度上升時間Tr1相較於未提高操作電流之前縮短了許多。另外，背光源之燈管的亮度上升時間Tr1也較亮度下降時間Tf縮短了許多。根據本實施例，將背光源之燈管的電流提高超過目標值電流可縮短背光源之燈管的亮度反應時間，欲使反應時間愈短，則所需提高的電流愈高。Please refer to FIG. 3, which is a schematic diagram of a first embodiment of a method for driving a lamp of a backlight according to the present invention. A fluorescent lamp of a general backlight includes a hot cathode fluorescent lamp (HCFL) and a cold cathode fluorescent lamp (CCFL). Taking the cold cathode fluorescent lamp as an example, the relative brightness is reduced from 90% to 10% for about 3ms, from the relative brightness of 10% to 90% for about 3ms, from the relative brightness of 100% to 0% for about 10ms, and the relative brightness is 0. %rise Up to 100% for about 10ms. Since the brightness rise time and the brightness fall time required for the fluorescent tube are long, when the fluorescent tube is used for the black insertion technique of the scanning backlight of the liquid crystal display, the effect of improving the dynamic blur is limited. The method for driving the lamp tube of the backlight can accelerate the brightness reaction time of the lamp of the backlight source, thereby improving the black insertion effect of the scanning backlight of the liquid crystal display. As shown in FIG. 3, the signal S1 represents the control signal of the backlight, the signal IL represents the operating current of the lamp, and the signal LS represents the brightness of the lamp. In this embodiment, when the lamp of the backlight is turned on, the operating current of the lamp is increased to shorten the brightness reaction time of the lamp of the backlight. The control signal S1 is a clock signal with a duty cycle of 50%. When the control signal S1 is at a high level, the light source of the backlight is turned on. When the control signal S1 is at a low level, the light source of the backlight is turned off. The operating current value of the lamp of the backlight is the value of Ia at the brightness value La. After the lamp of the backlight is turned on, in order to shorten the time when the lamp of the backlight reaches the brightness value La, the operating current value of the lamp is increased during Tr1. Up to Ib, the brightness rise time Tr1 of the backlight of the backlight is much shorter than before the operating current is not increased. Further, the luminance rise time Tr1 of the lamp of the backlight is also shortened much more than the luminance fall time Tf. According to the embodiment, increasing the current of the lamp of the backlight beyond the target value current can shorten the brightness reaction time of the lamp of the backlight, and the shorter the reaction time, the higher the current required to be increased.
請參考第4圖，第4圖為本發明驅動背光源之燈管之方法之第二實施例之示意圖。在本實施例中，當背光源之燈管開啟時，提高燈管的操作電流的頻率，以縮短背光源之燈管的亮度反應時間。控制訊號S1為責任週期50%之時脈訊號，當控制訊號S1為高準位時背光源之燈管開啟，當控制訊號S1為低準位時背光源之 燈管關閉。背光源之燈管在亮度值La的操作電流值為Ia，操作電流的頻率為f1，在開啟背光源之燈管後，為了縮短背光源之燈管到達亮度值La的時間，在Tr2期間將燈管的操作電流的頻率提高至f2，因此背光源之燈管的亮度上升時間Tr2相較於未提高操作電流的頻率之前縮短了許多。另外，背光源之燈管的亮度上升時間Tr2也較亮度下降時間Tf縮短了許多。根據本實施例，將背光源之燈管的電流的頻率可縮短背光源之燈管的亮度反應時間，欲使反應時間愈短，則所需提高的電流的頻率愈高。Please refer to FIG. 4, which is a schematic diagram of a second embodiment of a method for driving a lamp of a backlight according to the present invention. In this embodiment, when the lamp of the backlight is turned on, the frequency of the operating current of the lamp is increased to shorten the brightness reaction time of the lamp of the backlight. The control signal S1 is a clock signal with a duty cycle of 50%. When the control signal S1 is at a high level, the backlight of the backlight is turned on, and when the control signal S1 is at a low level, the backlight is The lamp is off. The operating current value of the backlight of the lamp of the brightness value La is Ia, and the frequency of the operating current is f1. After the lamp of the backlight is turned on, in order to shorten the time when the lamp of the backlight reaches the brightness value La, during the Tr2 period, The frequency of the operating current of the lamp is increased to f2, so the brightness rise time Tr2 of the lamp of the backlight is much shorter than before the frequency of the operating current is not increased. Further, the luminance rise time Tr2 of the lamp of the backlight is also shortened much more than the luminance fall time Tf. According to this embodiment, the frequency of the current of the lamp of the backlight can shorten the brightness reaction time of the lamp of the backlight, and the shorter the reaction time, the higher the frequency of the current required to be increased.
請參考第5圖，第5圖為本發明驅動背光源之燈管之方法之第三實施例之示意圖。在本實施例中，當背光源之燈管開啟時，同時提高燈管的操作電流的電流值及頻率，以縮短背光源之燈管的亮度反應時間。控制訊號S1為責任週期50%之時脈訊號，當控制訊號S1為高準位時背光源之燈管開啟，當控制訊號S1為低準位時背光源之燈管關閉。背光源之燈管在亮度值La的操作電流值為Ia，操作電流的頻率為f1，在開啟背光源之燈管後，為了縮短背光源之燈管到達亮度值La的時間，在Tr3期間將燈管的操作電流的電流值提高至Ic，並將燈管的操作電流的頻率提高至f3，因此背光源之燈管的亮度上升時間Tr3相較於未提高操作電流的電流值及頻率之前縮短了許多。另外，背光源之燈管的亮度上升時間Tr3也較亮度下降時間Tf縮短了許多。Please refer to FIG. 5, which is a schematic diagram of a third embodiment of a method for driving a lamp of a backlight according to the present invention. In this embodiment, when the lamp of the backlight is turned on, the current value and frequency of the operating current of the lamp are simultaneously increased to shorten the brightness reaction time of the lamp of the backlight. The control signal S1 is a clock signal with a duty cycle of 50%. When the control signal S1 is at a high level, the light source of the backlight is turned on. When the control signal S1 is at a low level, the light source of the backlight is turned off. The operating current value of the backlight of the lamp of the brightness value La is Ia, and the frequency of the operating current is f1. After the lamp of the backlight is turned on, in order to shorten the time when the lamp of the backlight reaches the brightness value La, during the Tr3 period, The current value of the operating current of the lamp is increased to Ic, and the frequency of the operating current of the lamp is increased to f3, so the brightness rise time Tr3 of the lamp of the backlight is shortened compared to the current value and frequency of the operating current not increased. A lot. Further, the luminance rise time Tr3 of the lamp of the backlight is also much shorter than the luminance fall time Tf.
請參考第6圖，第6圖為本發明驅動背光源之燈管之方法之 第四實施例之示意圖。利用提高燈管的操作電流值可以縮短背光源之燈管的亮度上升時間，同樣地，降低燈管的操作電流值也可以縮短背光源之燈管的亮度下降時間。控制訊號S1為責任週期50%之時脈訊號，當控制訊號S1為高準位時背光源之燈管電流值操作在Ia，當控制訊號S1為低準位時背光源之燈管電流值操作在Id。在本實施例中，背光源之燈管在亮度值La的操作電流值為Ia，背光源之燈管在亮度值Ld的操作電流值為Id，將背光源之燈管在亮度值La降低至Ld時，為了縮短背光源之燈管到達亮度值Ld的時間，在Tf1期間將燈管將背光源之燈管關閉，此時電流值為0，因此背光源之燈管的亮度下降時間T1相較於未在Tf1期間關閉燈管時縮短了許多。另外，背光源之燈管的亮度下降時間Tf1也較亮度上升時間Tr縮短了許多。另外，利用提高燈管的操作電流的頻率可以縮短背光源之燈管的亮度上升時間，同樣地，降低燈管的操作電流的頻率也可以縮短背光源之燈管的亮度下降時間。Please refer to FIG. 6 , which is a method for driving a lamp of a backlight according to the present invention. A schematic diagram of a fourth embodiment. By increasing the operating current value of the lamp, the brightness rise time of the lamp of the backlight can be shortened. Similarly, reducing the operating current value of the lamp can also shorten the brightness fall time of the lamp of the backlight. The control signal S1 is a clock signal with a duty cycle of 50%. When the control signal S1 is at a high level, the lamp current value of the backlight is operated at Ia, and when the control signal S1 is at a low level, the lamp current value of the backlight is operated. At Id. In this embodiment, the operating current value of the lamp of the backlight source at the luminance value La is Ia, and the operating current value of the lamp of the backlight source at the luminance value Ld is Id, and the lamp of the backlight is lowered to the luminance value La to In the case of Ld, in order to shorten the time when the lamp of the backlight reaches the brightness value Ld, the lamp of the backlight is turned off during the period of Tf1, and the current value is 0, so the brightness of the lamp of the backlight is decreased by the time T1. It is much shorter than when the lamp is not turned off during Tf1. In addition, the luminance falling time Tf1 of the backlight tube is also shortened much more than the luminance rising time Tr. In addition, by increasing the frequency of the operating current of the lamp, the brightness rise time of the lamp of the backlight can be shortened, and similarly, the frequency of the operating current of the lamp can be reduced to shorten the brightness fall time of the lamp of the backlight.
綜上所述，由於背光源之燈管所需的亮度上升時間與亮度下降時間較長，當背光源之燈管用於掃描式背光之插黑技術時，改善動態模糊的效果有限。本發明驅動背光源之燈管之方法利用調整背光源之燈管之操作電流之電流值或頻率以加速背光源之燈管之亮度反應時間。當開啟一背光源之燈管時，提供一操作電流以驅動該背光源之燈管達到一預定亮度，於該背光源之燈管之亮度未達到該預定亮度前，提高該操作電流之電流值或頻率以縮短該背光源之燈管之亮度上升短時間。另外，當關閉該背光源之燈管 或降低該背光源之燈管之亮度時，降低該操作電流之電流值或頻率以縮短該背光源之燈管之亮度下降時間。In summary, since the brightness rise time and the brightness fall time required for the lamp of the backlight source are long, when the backlight tube is used for the black insertion technique of the scanning backlight, the effect of improving the dynamic blur is limited. The method of driving a lamp of a backlight of the present invention utilizes a current value or frequency of an operating current of a lamp of a backlight to accelerate the brightness reaction time of the lamp of the backlight. When a lamp of a backlight is turned on, an operating current is provided to drive the lamp of the backlight to reach a predetermined brightness, and the current value of the operating current is increased before the brightness of the lamp of the backlight does not reach the predetermined brightness. Or frequency to shorten the brightness of the lamp of the backlight for a short period of time. In addition, when the light source of the backlight is turned off Or reducing the brightness of the lamp of the backlight, reducing the current value or frequency of the operating current to shorten the brightness reduction time of the lamp of the backlight.
以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
110‧‧‧液晶顯示面板110‧‧‧LCD panel
112、114、116‧‧‧掃描區塊112, 114, 116‧‧‧ scan blocks
120、120a~120f‧‧‧燈管120, 120a~120f‧‧‧ lamps
S1‧‧‧背光的控制訊號S1‧‧‧ backlight control signal
IL‧‧‧燈管的操作電流Operating current of IL‧‧‧ lamps
LS‧‧‧燈管的亮度LS‧‧‧ tube brightness
D‧‧‧責任週期D‧‧‧Responsibility cycle
Ia、Ib、Ic、Id‧‧‧操作電流值Ia, Ib, Ic, Id‧‧‧ operating current values
f1、f2、f3‧‧‧操作電流的頻率F1, f2, f3‧‧‧frequency of operating current
Tr、Tr1、Tr2、Tr3‧‧‧亮度上升時間Tr, Tr1, Tr2, Tr3‧‧‧ brightness rise time
Tf、Tf1‧‧‧亮度下降時間Tf, Tf1‧‧‧ brightness fall time
La、Ld‧‧‧亮度值La, Ld‧‧‧ brightness value
第1圖為先前技術之掃描式背光之液晶顯示器的示意圖。Figure 1 is a schematic illustration of a prior art scanning backlight liquid crystal display.
第2圖為先前技術之掃描式背光之訊號之波形圖。Figure 2 is a waveform diagram of the signal of the prior art scanning backlight.
第3圖為本發明驅動背光源之燈管之方法之第一實施例之示意圖。3 is a schematic view of a first embodiment of a method of driving a lamp of a backlight according to the present invention.
第4圖為本發明驅動背光源之燈管之方法之第二實施例之示意圖。4 is a schematic view showing a second embodiment of a method of driving a lamp of a backlight according to the present invention.
第5圖為本發明驅動背光源之燈管之方法之第三實施例之示意圖。FIG. 5 is a schematic view showing a third embodiment of a method of driving a lamp of a backlight according to the present invention.
第6圖為本發明驅動背光源之燈管之方法之第四實施例之示意圖。Figure 6 is a schematic view showing a fourth embodiment of the method of driving a lamp of a backlight of the present invention.
S1‧‧‧背光的控制訊號S1‧‧‧ backlight control signal
IL‧‧‧燈管的操作電流Operating current of IL‧‧‧ lamps
LS‧‧‧燈管的亮度LS‧‧‧ tube brightness
Ia、Ic‧‧‧操作電流值Ia, Ic‧‧‧ operating current values
f1、f3‧‧‧操作電流的頻率F1, f3‧‧‧frequency of operating current
Tr3‧‧‧亮度上升時間Tr3‧‧‧ brightness rise time
Tf‧‧‧亮度下降時間Tf‧‧‧ brightness fall time
La‧‧‧亮度值La‧‧‧ brightness value
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97144871A TWI394116B (en) | 2008-11-20 | 2008-11-20 | Method of driving a lamp of a backlight source for improving the luminance response |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97144871A TWI394116B (en) | 2008-11-20 | 2008-11-20 | Method of driving a lamp of a backlight source for improving the luminance response |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201020998A TW201020998A (en) | 2010-06-01 |
| TWI394116B true TWI394116B (en) | 2013-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW97144871A TWI394116B (en) | 2008-11-20 | 2008-11-20 | Method of driving a lamp of a backlight source for improving the luminance response |
Country Status (1)
| Country | Link |
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| TW (1) | TWI394116B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200630668A (en) * | 2005-02-16 | 2006-09-01 | Delta Optoelectronics Inc | Cold cathode flat fluorescent light (CCFFL) and the driving method |
| US20070211499A1 (en) * | 2002-11-15 | 2007-09-13 | Rohm Co., Ltd. | DC-AC Converter and Controller IC Therefor |
| TW200836146A (en) * | 2007-02-16 | 2008-09-01 | Gigno Technology Co Ltd | Lamp driving method |
| TWM340476U (en) * | 2007-11-21 | 2008-09-11 | Top Victory Invest Ltd | Backlight apparatus for lcd devices having multiple phase-lagged sets of lamps |
-
2008
- 2008-11-20 TW TW97144871A patent/TWI394116B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070211499A1 (en) * | 2002-11-15 | 2007-09-13 | Rohm Co., Ltd. | DC-AC Converter and Controller IC Therefor |
| TW200630668A (en) * | 2005-02-16 | 2006-09-01 | Delta Optoelectronics Inc | Cold cathode flat fluorescent light (CCFFL) and the driving method |
| TW200836146A (en) * | 2007-02-16 | 2008-09-01 | Gigno Technology Co Ltd | Lamp driving method |
| TWM340476U (en) * | 2007-11-21 | 2008-09-11 | Top Victory Invest Ltd | Backlight apparatus for lcd devices having multiple phase-lagged sets of lamps |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201020998A (en) | 2010-06-01 |
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