TWI423226B - Backlight control system and method - Google Patents

Backlight control system and method Download PDF

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TWI423226B
TWI423226B TW97136767A TW97136767A TWI423226B TW I423226 B TWI423226 B TW I423226B TW 97136767 A TW97136767 A TW 97136767A TW 97136767 A TW97136767 A TW 97136767A TW I423226 B TWI423226 B TW I423226B
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backlight
duty cycle
cycle signal
signal
current frame
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TW97136767A
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TW201013622A (en
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Shing Chia Chen
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Himax Media Solutions Inc
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Description

背光控制系統和方法Backlight control system and method

本發明係有關一種背光(backlight)控制，特別是一種使用驅動加速(overdrive)查詢表(lookup table)之背光控制系統及方法。The present invention relates to a backlight control, and more particularly to a backlight control system and method using a drive overdrive lookup table.

背光控制係用以從背面或側面來照亮平面顯示器(例如液晶顯示器)的一種技術。光源可以是冷陰極管(CCFL)、發光二極體(LED)或其他光源。Backlight control is a technique used to illuminate a flat panel display, such as a liquid crystal display, from the back or side. The light source can be a cold cathode tube (CCFL), a light emitting diode (LED) or other light source.

固定式背光不管影像資料或週邊光線如何變化都會提供穩定固定的光線。固定式背光的最大缺點為不良的動態對比特性。為了增加其對比，必須使用動態背光(dynamic backlight, DBL)技術，其動態地或適應性地(adaptively)根據影像資料的分佈情形以調整整體或某特定部分的背光亮度。A fixed backlight provides stable, fixed light regardless of changes in image data or ambient light. The biggest drawback of fixed backlights is the poor dynamic contrast characteristics. In order to increase their contrast, dynamic backlight (DBL) techniques must be used that dynamically or adaptively adjust the backlight brightness of the whole or a particular portion depending on the distribution of the image data.

然而，一般的冷陰極管具有反應較慢的特性。換句話說，冷陰極管需要一段時間才能達到目標亮度；因此，背 光的亮度改變通常會落後於背光驅動信號(例如脈寬調變(PWM)工作週期(duty)訊號)的改變。若要解決上述反應慢之問題，必須使用特殊之快速但昂貴之冷陰極管來置換一般便宜之冷陰極管。然而，此種解決方法對於大量製造而言，若考量其成本及消費者接受度，將是不實際的。However, a typical cold cathode tube has a slow response characteristic. In other words, it takes a while for the cold cathode tube to reach the target brightness; therefore, the back The change in brightness of the light typically lags behind changes in the backlight drive signal (such as a pulse width modulation (PWM) duty signal). To solve the above problem of slow reaction, a special fast but expensive cold cathode tube must be used to replace the generally inexpensive cold cathode tube. However, such a solution would be impractical for large-scale manufacturing, considering its cost and consumer acceptance.

鑑於傳統背光(特別是動態背光)不能有效地符合所要求的反應時間，因此，亟需提出一種新穎的動態背光控制機制，使其具有較快的反應時間且不會犧牲其成本。Since conventional backlights (especially dynamic backlights) do not effectively meet the required reaction times, there is a need to propose a novel dynamic backlight control mechanism that allows for faster reaction times without sacrificing cost.

根據上述，本發明的目的之一為提供一種背光控制系統及方法，用以增快其反應時間且不會犧牲成本。In light of the foregoing, it is an object of the present invention to provide a backlight control system and method for increasing the response time without sacrificing cost.

根據本發明實施例，驅動加速(overdrive)裝置根據目前訊框之背光工作週期訊號與先前訊框之背光工作週期訊號以更改背光工作週期訊號。在一實施例中，驅動加速裝置包含一查詢表，其可經查詢而輸出得到該更改之背光工作週期訊號。以該更改之背光工作週期訊號驅動背光以發射光線至顯示面板，因而得以增快背光的反應速度。According to an embodiment of the invention, the overdrive device changes the backlight duty cycle signal according to the backlight duty cycle signal of the current frame and the backlight duty cycle signal of the previous frame. In one embodiment, the drive acceleration device includes a lookup table that can be queried to output the modified backlight duty cycle signal. The backlight is driven by the modified backlight duty cycle signal to emit light to the display panel, thereby increasing the response speed of the backlight.

第一圖顯示本發明實施例之動態背光驅動加速(overdrive)控制系統1。第二圖顯示本發明實施例之動態背光驅動加速控制方法2的流程步驟。鑑於一般光源具較慢的反應速度，例如冷陰極管(CCFL)、低速發光二極體(LED)或其他低等級光源，本實施例因此使用驅動加速裝置10以加速背光控制系統1的整體反應時間。驅動加速裝置10之實施可以為硬體電路、軟體程式或其組合。在本實施例中，係以一查詢表(lookup table)(如下表一)來實施(步驟20)，但是本發明並不限定於此。此驅動加速查詢表係根據目前背光工作週期訊號(BL duty)及(儲存於緩衝器12之)先前背光工作週期訊號，以輸出驅動加速背光工作週期訊號(BL duty)。該背光工作週期訊號(BL duty)可以為脈寬調變(PWM)訊號，其脈寬正比於所需之背光照度。於表一當中，縱軸代表先前訊框(frame)背光工作週期訊號，而橫軸則代表目前訊框背光工作週期訊號。表一所示之值僅作為例示(而非限定)一個八位元系統。表一當中的每一個值所對應的工作週期(duty cycle)相當於”值/255”。例如，表一當中的值"59"即對應至23% (=59/255)之工作週期(例如背光脈寬調變(PWM)工作週期)。The first figure shows a dynamic backlight drive overdrive control system 1 in accordance with an embodiment of the present invention. The second figure shows the flow steps of the dynamic backlight driving acceleration control method 2 of the embodiment of the present invention. In view of the slow response speed of a typical light source, such as a cold cathode tube (CCFL), a low speed light emitting diode (LED) or other low level light source, the present embodiment thus uses the drive acceleration device 10 to accelerate the overall response of the backlight control system 1. time. The implementation of the drive acceleration device 10 can be a hardware circuit, a software program, or a combination thereof. In the present embodiment, it is implemented by a lookup table (the following Table 1) (step 20), but the present invention is not limited thereto. The drive acceleration lookup table is based on the current backlight duty cycle signal (BL duty) and the previous backlight duty cycle signal (stored in the buffer 12) to output an accelerated backlight duty cycle signal (BL duty). The backlight duty cycle (BL duty) can be a pulse width modulation (PWM) signal whose pulse width is proportional to the desired backlight illumination. In Table 1, the vertical axis represents the previous frame backlight duty cycle signal, and the horizontal axis represents the current frame backlight duty cycle signal. The values shown in Table 1 are for illustrative purposes only and are not intended to be an octet system. The duty cycle corresponding to each value in Table 1 is equivalent to "value / 255". For example, the value "59" in Table 1 corresponds to a duty cycle of 23% (= 59/255) (eg, backlight pulse width modulation (PWM) duty cycle).

接著，比較目前訊框背光工作週期與先前訊框背光工作週期(步驟21)，再由驅動加速查詢表得到驅動加速背光週期作為輸出。第三圖例示背光工作週期訊號之反應波形，其中N代表目前訊框，N-1代表先前訊框，而DN-1 /DN /D'則代表背光工作週期訊號的強度。如果先前訊框的背光工作週期小於目前訊框的背光工作週期(亦即，DN-1 <DN )，則使用強度大於預期DN 的較大強度D'N 作為驅動加送背光工作週期的輸出(步驟22A)。例如，如果先前訊框的背光工作週期為"32"，而目前訊框的背光工作週期為"64"，由於"32"<"64"，因此從驅動加速查詢表查詢得到背光週期為"97"作為驅動加送背光工作週期的輸出。由第三圖可得知，使用驅動加速後會形成反應波形30，其反應時間遠快於未使用驅動加速之反應波形32。Then, the current frame backlight working period and the previous frame backlight working period are compared (step 21), and then the driving acceleration query period is obtained by driving the acceleration query table as an output. The third figure illustrates the response waveform of the backlight duty cycle signal, where N represents the current frame, N-1 represents the previous frame, and D N-1 /D N /D' represents the intensity of the backlight duty cycle signal. If the backlight working period of the previous frame is smaller than the backlight working period of the current frame (ie, D N-1 <D N ), the larger intensity D′ N with the intensity greater than the expected D N is used as the driving plus backlight working cycle. The output (step 22A). For example, if the backlight working cycle of the previous frame is "32", and the backlight working cycle of the current frame is "64", since the "32"<"64", the backlight cycle is "97" from the driver acceleration query table query. "As the output of the drive plus backlight duty cycle. As can be seen from the third figure, the reaction waveform 30 is formed after acceleration using the drive, and the reaction time is much faster than the response waveform 32 that is not used for driving acceleration.

如果先前訊框的背光工作週期大於目前訊框的背光工作週期(亦即，DN-1 >DN )，則使用強度小於預期DN 的較小強度D'N 作為驅動加送背光工作週期的輸出(步驟22B)。如果先前訊框的背光工作週期等於或大約等於目前 訊框的背光工作週期(亦即，DN-1 =DN )，則使用強度等於預期DN 的相同強度D'N 作為驅動加送背光工作週期的輸出(步驟22C)。If the backlight working period of the previous frame is greater than the backlight working period of the current frame (ie, D N-1 >D N ), the smaller intensity D′ N with the intensity less than the expected D N is used as the driving plus backlight working cycle. The output (step 22B). If the backlight duty cycle of the previous frame is equal to or approximately equal to the backlight duty cycle of the current frame (ie, D N-1 = D N ), the same intensity D′ N equal to the expected D N is used as the driving plus backlight. The output of the duty cycle (step 22C).

接著，將所產生的驅動加速背光工作週期訊號饋至背光裝置(簡稱背光)或背光模組14，用以動態地控制背光14的發光元件(例如冷陰極管、低速發光二極體或其他光源)之開與關。該背光14因而提供照射光線至顯示面板16(步驟23)。Then, the generated driving acceleration backlight duty cycle signal is fed to a backlight device (referred to as a backlight) or a backlight module 14 for dynamically controlling the light-emitting elements of the backlight 14 (such as a cold cathode tube, a low-speed LED or other light source). ) Open and close. The backlight 14 thus provides illumination to the display panel 16 (step 23).

根據本發明實施例，動態背光14的反應快於傳統未使用驅動加速技術之背光。本發明提供大量製造背光裝置的途徑，此種動態背光不但能增快反應時間且不會犧牲成本。In accordance with an embodiment of the invention, the dynamic backlight 14 reacts faster than conventional backlights that do not use drive acceleration techniques. The present invention provides a means of manufacturing a large number of backlights that not only increase reaction time but also do not sacrifice cost.

以上所述僅為本發明之較佳實施例而已，並非用以限定本發明之申請專利範圍；凡其它未脫離發明所揭示之精神下所完成之等效改變或修飾，均應包含在下述之申請專利範圍內。The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the invention should be included in the following Within the scope of the patent application.

1‧‧‧動態背光驅動加速(overdrive)控制系統1‧‧‧Dynamic backlight drive acceleration (overdrive) control system

10‧‧‧驅動加速裝置10‧‧‧Drive Accelerator

12‧‧‧緩衝器12‧‧‧ buffer

14‧‧‧背光14‧‧‧ Backlight

16‧‧‧面板16‧‧‧ panel

2‧‧‧動態背光驅動加速控制方法2‧‧‧Dynamic backlight drive acceleration control method

20-23‧‧‧動態背光驅動加速控制方法之步驟20-23‧‧‧Steps for dynamic backlight drive acceleration control method

30‧‧‧使用驅動加速之反應波形30‧‧‧Responsive waveforms using drive acceleration

32‧‧‧未使用驅動加速之反應波形32‧‧‧Dynamic waveforms without drive acceleration

第一圖顯示本發明實施例之動態背光驅動加速(overdrive)控制系統。The first figure shows a dynamic backlight drive overdrive control system in accordance with an embodiment of the present invention.

第二圖顯示本發明實施例之動態背光驅動加速控制方法的流程步驟。The second figure shows the flow steps of the dynamic backlight driving acceleration control method of the embodiment of the present invention.

第三圖例示背光工作週期訊號之反應波形。The third figure illustrates the response waveform of the backlight duty cycle signal.

1‧‧‧動態背光驅動加速(overdrive)控制系統1‧‧‧Dynamic backlight drive acceleration (overdrive) control system

10‧‧‧驅動加速裝置10‧‧‧Drive Accelerator

12‧‧‧緩衝器12‧‧‧ buffer

14‧‧‧背光14‧‧‧ Backlight

16‧‧‧面板16‧‧‧ panel

Claims (16)

一種背光控制系統，包含：一背光，其發射光線至一顯示面板；及一驅動加速(overdrive)裝置，其根據目前訊框之背光工作週期訊號與先前訊框之背光工作週期訊號以更改背光工作週期訊號，藉由該更改之背光工作週期訊號而得以增快該背光之反應速度；其中上述之驅動加速裝置比較目前訊框背光工作週期訊號之工作週期值與先前訊框背光工作週期訊號之工作週期值；其中當先前訊框背光工作週期訊號之工作週期值小於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊號的強度會大於目前訊框背光工作週期訊號的強度，並用以控制該背光。 A backlight control system includes: a backlight that emits light to a display panel; and a drive overdrive device that changes backlight operation according to a backlight duty cycle signal of the current frame and a backlight duty cycle signal of the previous frame The periodic signal is used to increase the response speed of the backlight by the modified backlight duty cycle signal; wherein the driving acceleration device compares the duty cycle value of the current frame backlight duty cycle signal with the previous frame backlight duty cycle signal a period value; wherein when the duty cycle value of the previous frame backlight duty cycle signal is less than the duty cycle value of the current frame backlight duty cycle signal, the intensity of the changed backlight duty cycle signal is greater than the current frame backlight duty cycle signal. Intensity and used to control the backlight. 如申請專利範圍第1項所述之背光控制系統，其中上述之驅動加速裝置包含一查詢表，經查詢而輸出得到該更改之背光工作週期訊號。 The backlight control system of claim 1, wherein the driving acceleration device comprises a look-up table, and the modified backlight duty cycle signal is outputted by querying. 如申請專利範圍第2項所述之背光控制系統，其中上述查詢表的一軸代表先前訊框之背光工作週期訊號，而另一軸則代表目前訊框背光工作週期訊號。 The backlight control system of claim 2, wherein one axis of the lookup table represents a backlight duty cycle signal of the previous frame, and the other axis represents a current frame backlight duty cycle signal. 如申請專利範圍第1項所述之背光控制系統，其中上述之背光工作週期訊號為脈寬調變(PWM)訊號，其脈寬正比於所需之背光照度。 The backlight control system of claim 1, wherein the backlight duty cycle signal is a pulse width modulation (PWM) signal, and the pulse width is proportional to the required backlight illumination. 如申請專利範圍第1項所述之背光控制系統，更包含一緩衝器，用以儲存以提供該先前訊框之背光工作週期訊號。 The backlight control system of claim 1, further comprising a buffer for storing the backlight duty cycle signal of the previous frame. 如申請專利範圍第1項所述之背光控制系統，其中上述之背光包含複數個冷陰極管(CCFL)或發光二極體(LED)。 The backlight control system of claim 1, wherein the backlight comprises a plurality of cold cathode tubes (CCFLs) or light emitting diodes (LEDs). 如申請專利範圍第1項所述之背光控制系統，當先前訊框背光工作週期訊號之工作週期值大於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊號的強度會小於目前訊框背光工作週期訊號的強度，並用以控制該背光。 For example, in the backlight control system of claim 1, when the duty cycle value of the previous frame backlight duty cycle signal is greater than the duty cycle value of the current frame backlight duty cycle signal, the intensity of the modified backlight duty cycle signal is changed. It will be smaller than the intensity of the current frame backlight duty cycle signal and used to control the backlight. 如申請專利範圍第7項所述之背光控制系統，當先前訊框背光工作週期訊號之工作週期值大約等於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊號的強度會大約等於目前訊框背光工作週期訊號的強度，並用以控制該背光。 For example, in the backlight control system described in claim 7, when the duty cycle value of the previous frame backlight duty cycle signal is approximately equal to the duty cycle value of the current frame backlight duty cycle signal, the modified backlight duty cycle signal is The intensity will be approximately equal to the intensity of the current frame backlight duty cycle signal and used to control the backlight. 一種背光控制方法，包含：根據目前訊框之背光工作週期訊號與先前訊框之背光工作週期訊號以更改背光工作週期訊號，藉由該更改之背光工作週期訊號而得以增快一背光的反應速度；及使用該更改之背光工作週期訊號以驅動該背光，因而發射光線至一顯示面板；其中上述更改背光工作週期訊號之步驟包含：比較目前訊框背光工作週期訊號之工作週期值與先前訊框背光工作週期訊號之工作週期值；其中當先前訊框背光工作週期訊號之工作週期值小於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊號的強度會大於目前訊框背光工作週期訊號的強度，並用以控制該背光。 A backlight control method includes: changing a backlight duty cycle signal according to a backlight duty cycle signal of a current frame and a backlight duty cycle signal of a previous frame, and increasing a backlight response speed by using the changed backlight duty cycle signal And using the modified backlight duty cycle signal to drive the backlight, thereby emitting light to a display panel; wherein the step of changing the backlight duty cycle signal comprises: comparing the duty cycle value of the current frame backlight duty cycle signal with the previous frame The duty cycle value of the backlight duty cycle signal; wherein when the duty cycle value of the previous frame backlight duty cycle signal is less than the duty cycle value of the current frame backlight duty cycle signal, the intensity of the modified backlight duty cycle signal is greater than the current signal The intensity of the frame backlight duty cycle signal is used to control the backlight. 如申請專利範圍第9項所述之背光控制方法，更包含一查詢表，經查詢而輸出得到該更改之背光工作週期訊號。 The backlight control method according to claim 9 further includes a look-up table, and the corrected backlight duty cycle signal is outputted by the query. 如申請專利範圍第10項所述之背光控制方法，其中上述查詢表的一軸代表先前訊框之背光工作週期訊號，而另一軸則代表目前訊框背光工作週期訊號。 The backlight control method of claim 10, wherein one axis of the lookup table represents a backlight duty cycle signal of the previous frame, and the other axis represents a current frame backlight duty cycle signal. 如申請專利範圍第9項所述之背光控制方法，其中上述之背光工作週期訊號為脈寬調變(PWM)訊號，其脈寬正比於所需之背光照度。 The backlight control method of claim 9, wherein the backlight duty cycle signal is a pulse width modulation (PWM) signal, and the pulse width is proportional to the required backlight illumination. 如申請專利範圍第9項所述之背光控制方法，更包含緩衝儲存以提供該先前訊框之背光工作週期訊號。 The backlight control method of claim 9, further comprising buffer storage to provide a backlight duty cycle signal of the previous frame. 如申請專利範圍第9項所述之背光控制方法，其中上述之背光包含複數個冷陰極管(CCFL)或發光二極體(LED)。 The backlight control method of claim 9, wherein the backlight comprises a plurality of cold cathode tubes (CCFLs) or light emitting diodes (LEDs). 如申請專利範圍第9項所述之背光控制方法，當先前訊框背光工作週期訊號之工作週期值大於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊 號的強度會小於目前訊框背光工作週期訊號的強度，並用以控制該背光。 For example, in the backlight control method described in claim 9, when the duty cycle value of the previous frame backlight duty cycle signal is greater than the duty cycle value of the current frame backlight duty cycle signal, the modified backlight duty cycle is The intensity of the number will be less than the intensity of the current backlight duty cycle signal and used to control the backlight. 如申請專利範圍第15項所述之背光控制方法，當先前訊框背光工作週期訊號之工作週期值大約等於目前訊框背光工作週期訊號之工作週期值時，則上述更改之背光工作週期訊號的強度會大約等於目前訊框背光工作週期訊號的強度，並用以控制該背光。The backlight control method according to claim 15, wherein when the duty cycle value of the previous frame backlight duty cycle signal is approximately equal to the duty cycle value of the current frame backlight duty cycle signal, the modified backlight duty cycle signal is The intensity will be approximately equal to the intensity of the current frame backlight duty cycle signal and used to control the backlight.
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