1310859 九、發明說明 【發明所屬之技術領域】 本發明是有關於一種掃瞄式背光（Scan Backlight)模組 與其7C度調整方法，特別是有關於一種可使各區塊的亮度實 質相同之掃瞄式背光模組與其區塊亮度的調整方法。 【先前技術】 目刖，以液晶顯示器技術所製成之電視與顯示螢幕已逐 漸取代傳統式之陰極射線管（Cath〇de Ray Tube; CRT)所製 之電視與顯示器。然而，相較於陰極射線管，現有之液晶顯 示器技術仍存在尚待克服與改進的缺失與限制。 習知之掃描式背光模組係用來讓使用存留式（Hold Type)之顯像方式的液晶顯示器’得以有效地模擬使用脈衝 式（Impulse type)之顯像方式的陰極射線管，並搭配快速反 應液晶來改善液晶顯示器的動態影像品質。請參照第丨圖， 其係繪示習知之掃描式背光模組的結構示意圖，其中複數個 區隔物20a、20b、20c、20d和20e係設置在殼體10上，以 區分出複數個區塊30a、3〇b、3〇c和3〇d，其中區隔物2〇a 2〇d y屬於反射板結構。區塊30a中安裝有至少一個光源4〇a; 區塊30c中安裝有至少一個光源4〇c(例如：冷陰極螢光燈 管（CCFL));區塊30c中安裝有至少一個光源4〇c ;區塊3〇d 中安裝有至少一個光源4〇d。區隔物2〇a_2〇e係用以隔絕區 塊30a-30d之光源4〇a_4〇d產生混光現象，並避免區塊 30a-30d之光源4〇a-40d彼此相互影響，藉以改善殘影現 1310859 象’並提昇液晶顯示器的動畫品質。當掃描式區塊30a_3〇d 的亮度A、亮度b、亮度c和亮度D差異太大，液晶顯示 器的顯示品質會受到嚴重的影響。 ' 然而，由於每個光源40a-40d的製程不同，光源 ：40a_40d本身的亮度即相當不均齊’其所形成之區塊30a-30d 的亮度自然亦相當不一致。而區隔物20a-20e的斜面在製作 上亦有誤差存在，導致各區塊30a和30b具有不同的光學效 •果。加上，燈管40a和40b的衰減速率不同，隨著使用時間 的增加，區塊30a和30b之亮度的差異會愈來愈大。因此， 習知之掃描式背光模組有區塊亮度不均勻的缺點。 【發明内容】 因此本發明一方面就是在提供一種掃瞄式背光模組與 其亮度調整方法，藉以調整光源的亮暗區間比（Duty Rati〇) 或電流，來使掃描式背光模組中各區塊的亮度實質相同。1310859 IX. Description of the Invention [Technical Field] The present invention relates to a Scan Backlight module and a 7C degree adjustment method thereof, and more particularly to a scan that can make the brightness of each block substantially the same. The method of adjusting the brightness of the aiming backlight module and its block. [Prior Art] It has been observed that televisions and display screens made by liquid crystal display technology have gradually replaced televisions and displays made by conventional cathode ray tubes (CRT). However, compared with cathode ray tubes, existing liquid crystal display technologies still have limitations and limitations that have yet to be overcome and improved. The conventional scanning backlight module is used to enable a liquid crystal display using a Hold Type imaging method to effectively simulate a cathode ray tube using an impulse type imaging method, and is equipped with a rapid response. Liquid crystal to improve the dynamic image quality of liquid crystal displays. Please refer to the second drawing, which is a schematic structural view of a conventional scanning backlight module, in which a plurality of partitions 20a, 20b, 20c, 20d and 20e are arranged on the casing 10 to distinguish a plurality of zones. Blocks 30a, 3〇b, 3〇c and 3〇d, wherein the partition 2〇a 2〇dy belongs to the reflector structure. At least one light source 4〇a is installed in the block 30a; at least one light source 4〇c (for example, a cold cathode fluorescent lamp tube (CCFL)) is mounted in the block 30c; and at least one light source 4 is mounted in the block 30c. c; at least one light source 4〇d is installed in the block 3〇d. The partition 2〇a_2〇e is used to insulate the light source 4〇a_4〇d of the blocks 30a-30d to generate a light mixing phenomenon, and avoids the light sources 4〇a-40d of the blocks 30a-30d from interacting with each other, thereby improving the residual The film 1310859 is like 'and enhances the animation quality of LCD monitors. When the difference in brightness A, brightness b, brightness c, and brightness D of the scanning block 30a_3〇d is too large, the display quality of the liquid crystal display is seriously affected. However, since the processes of each of the light sources 40a-40d are different, the brightness of the light source: 40a_40d itself is rather uneven. The brightness of the blocks 30a-30d formed is naturally quite inconsistent. The slopes of the partitions 20a-20e also have errors in fabrication, resulting in different optical effects for each of the blocks 30a and 30b. In addition, the decay rates of the lamps 40a and 40b are different, and as the use time increases, the difference in brightness between the blocks 30a and 30b becomes larger and larger. Therefore, the conventional scanning backlight module has the disadvantage of uneven brightness of the block. SUMMARY OF THE INVENTION Therefore, in one aspect of the present invention, a scanning backlight module and a brightness adjustment method thereof are provided to adjust a light-to-dark ratio (Duty Rati) or a current of a light source to make each region of the scanning backlight module The brightness of the blocks is essentially the same.
本發明另一方面就是在提供一種掃瞄式背光模組與其 亮度調整方法，藉以產生區塊亮度的回授（Feedback)信號來 自動調整光源的亮暗區間比，以使掃描式背光模組中各區塊 的亮度實質相同。 依照本發明之較佳實施例，本發明之 少包括殼體、複數個區隔物、至少一個光源、==感; 兀件、凴度比較器和控制電路。區隔物係設置在殼體上，以 區分出複數個區塊，而每一個區塊中設置有至少一個光源。 光感測元件係用來感測每一個區塊的亮度，而亮度比較器係 1310859 用來將每一個區塊之亮度與預設亮度值比較，以產生複數個 回授信號，控制電路則根據此些回授信號來調整每一個區塊 之光源的亮暗區間比或電流。 又，在本發明之掃瞄式背光模組之亮度調整方法中，首 先’分別感測每一個區塊之亮度，而獲得複數個區塊亮度 值。接著’分別將此些區塊亮度值與預設亮度值比較，而獲 得複數個區塊亮度比較結果。然後，根據區塊亮度比較結Another aspect of the present invention provides a scanning backlight module and a brightness adjustment method thereof, thereby generating a feedback signal of a block brightness to automatically adjust a light-dark interval ratio of the light source, so that the scanning backlight module is The brightness of each block is substantially the same. In accordance with a preferred embodiment of the present invention, the invention includes less than a housing, a plurality of compartments, at least one light source, a sense of inductance, a clamp, a twist comparator, and a control circuit. The partition system is disposed on the casing to distinguish a plurality of blocks, and each block is provided with at least one light source. The light sensing component is used to sense the brightness of each block, and the brightness comparator system 1310859 is used to compare the brightness of each block with a preset brightness value to generate a plurality of feedback signals, and the control circuit is based on These feedback signals are used to adjust the light-dark interval ratio or current of the light source of each block. Moreover, in the brightness adjusting method of the scanning type backlight module of the present invention, the brightness of each block is first sensed separately, and a plurality of block brightness values are obtained. Then, the brightness values of the blocks are compared with the preset brightness values to obtain a plurality of block brightness comparison results. Then, based on the block brightness comparison
果’來調整每一個區塊之光源的亮暗區間比或電流，以使此 些區塊的亮度實質相同。前述之區塊亮度比較結果可為複數 個回授信號’用以輸入至控制電路。另外，控制電路可加入 控制光源之亮暗電流頻率的高頻訊號，來調整光源的亮暗區 間比。 【實施方式】 本發明之特徵係在於使用至少一個光感測元件來感測 背光模組中由複數個區隔物所區分出之複數個區塊的亮 度’並在比較亮度並獲得每一個區塊之亮度比較結果後，調 整每一個區塊之至少一個光源的亮暗區間比或電流，以使每 —個區塊的亮度實質相同。 請參照第1圖、第2A圖和第2B圖，第2A圖和第2B 圖係分別描述應用本發明之亮度調整方法之前和之後的光 源和區塊的狀態。如第1圖和第2A圖所示，首先，使用 至少一個光感測元件來感測區塊30a-30d的亮度A-D，其區 塊壳度值分別為500nit、532nit、472nit和490nit。若此些 1310859 區塊30a-30d所需達到的預設亮度值為500nit，則區塊 30b-30d的亮度B-D均不合格’必須加以調整。調整區塊 30b-30d的亮度B-D的方式可直接增加或減少通過區塊 30b-30d中之光源40b-40d的電流，來增加或減少區塊 3 0b-3 0d的亮度B-D，其中電流愈大則亮度愈高。例如：區 塊30b的亮度B(532nit)大於預設亮度值（500nit)，故應減少 通過光源40b的電流，以降低區塊30b的亮度B至預設亮The result is to adjust the light-dark interval ratio or current of the light source of each block so that the brightness of these blocks is substantially the same. The foregoing block luminance comparison result may be a plurality of feedback signals 'for input to the control circuit. In addition, the control circuit can add a high frequency signal that controls the light and dark current frequency of the light source to adjust the light-dark ratio of the light source. [Embodiment] The present invention is characterized in that at least one light sensing element is used to sense the brightness of a plurality of blocks distinguished by a plurality of partitions in a backlight module and compare the brightness and obtain each area. After comparing the brightness of the blocks, the light-dark interval ratio or current of at least one of the light sources of each block is adjusted so that the brightness of each block is substantially the same. Referring to Fig. 1, Fig. 2A and Fig. 2B, Figs. 2A and 2B are diagrams respectively showing the states of the light source and the block before and after the brightness adjusting method of the present invention is applied. As shown in Figures 1 and 2A, first, at least one of the light sensing elements is used to sense the brightness A-D of the blocks 30a-30d, with block values of 500 nit, 532 nit, 472 nit, and 490 nit, respectively. If the preset brightness values required for the 1310859 blocks 30a-30d are 500 nit, then the brightness B-D of the blocks 30b-30d is unqualified' must be adjusted. The manner of adjusting the brightness BD of the blocks 30b-30d can directly increase or decrease the current through the light sources 40b-40d in the blocks 30b-30d to increase or decrease the brightness BD of the block 3 0b-3 0d, wherein the larger the current The higher the brightness. For example, the brightness B (532 nit) of the block 30b is greater than the preset brightness value (500 nit), so the current through the light source 40b should be reduced to reduce the brightness B of the block 30b to a preset brightness.
度值；區塊30c和30d的亮度C(472nit)和亮度D(490nit)小 於預設亮度值（500nit)，故應增加通過光源40c和40d的電 流’以提升區塊30c和30d的亮度C和亮度D至預設亮度 值。 另外’調整區塊30b-30d的亮度B-D的方式亦可藉由 增加或減少光源40b-40d的亮暗區間比來達成。如第2A圖 和第2B圖所示，調整前之光源40b-40d的亮暗區間比均為 50。/。’由於亮暗區間比愈大’光源所造成之亮度愈高。因此， 當區塊30b的亮度B(532nit)大於預設亮度值（5〇〇nit)時，可 減少光源4 0 b的亮暗區間比至例如4 7 %，以降低區塊3 0 b 的免度B至預設亮度值；當區塊30c和30d的亮度C(472nit) 和亮度D(490nit)小於預設亮度值（5〇〇nit)時，則可增加光源 40c和40d的亮暗區間比至例如53%和5 1%，以提升區塊30c 和30d的亮度C和亮度D至預設亮度值。 此外’本發明進一步使用控制電路來調整每一個區塊之 的亮暗區間比或電流，以使每—個區塊的亮度實質相同。請 參照第1圖和第3圖，第3圖係繪示本發明之較佳實施例 1310859 之掃瞄式背光模組的功能方塊示意圖，光感測元件1 00a、 100b、100c和l〇〇d係分別設置於與區塊30a、30b、30c和 30d相對應的位置，用以分別感測此些區塊的亮度，而獲得 複數個區塊亮度值。光感測元件100a-100d可為感光二極體 (Photo Diode)、載子耦合元件（Charge Couple Device ;Degrees; the brightness C (472 nit) and the brightness D (490 nit) of the blocks 30c and 30d are smaller than the preset brightness value (500 nit), so the current through the light sources 40c and 40d should be increased to enhance the brightness C of the blocks 30c and 30d. And brightness D to the preset brightness value. Further, the manner of adjusting the brightness B-D of the blocks 30b-30d can also be achieved by increasing or decreasing the light-dark interval ratio of the light sources 40b-40d. As shown in Figs. 2A and 2B, the light-dark interval ratios of the light sources 40b-40d before adjustment are both 50. /. The brightness is higher due to the light source and darker area. Therefore, when the brightness B (532 nit) of the block 30b is greater than the preset brightness value (5 〇〇 nit), the light-dark interval ratio of the light source 40 b can be reduced to, for example, 4 7 % to reduce the block 3 0 b B is exempted from the preset brightness value; when the brightness C (472 nit) and the brightness D (490 nit) of the blocks 30c and 30d are smaller than the preset brightness value (5 〇〇 nit), the light and dark of the light sources 40c and 40d can be increased. The interval ratios are, for example, 53% and 51% to increase the brightness C and the brightness D of the blocks 30c and 30d to a preset brightness value. Further, the present invention further uses a control circuit to adjust the light-dark interval ratio or current of each block so that the brightness of each block is substantially the same. Please refer to FIG. 1 and FIG. 3 . FIG. 3 is a functional block diagram of a scanning backlight module according to a preferred embodiment 1310859 of the present invention. The light sensing components 1 00a, 100b, 100c and 10〇〇 d is respectively disposed at positions corresponding to the blocks 30a, 30b, 30c, and 30d for respectively sensing the brightness of the blocks to obtain a plurality of block brightness values. The light sensing elements 100a-100d may be a photodiode or a carrier coupler (Charge Couple Device;
CCD)、光電晶體或光敏電阻等。在此些區塊亮度值傳送至 亮度比較器200後，亮度比較器200分別將此些區塊亮度值 之亮度與預設亮度值比較，藉以產生複數個回授信號（區塊 亮度比較結果），其申此些回授信號代表區塊30a_30b的亮 度過高或偏低’而預設亮度值的決定可為出廠設定值或使用 者自定的適當值。接著，傳送此些回授信號至控制電路 220 ’控制電路220便根據此些回授信號來自動調整區塊 30a-30d之光源40a-40d的亮暗區間比或電流，以使區塊 30a-3 0d的亮度實質相同。例如：當區塊30b的回授信號指 出其売度過咼時’控制電路220會自動將區塊30b之光源 40b的亮暗區間比或電流降低；當區塊3〇c和30d的回授信 號指出其壳度偏低時，控制電路220則會自動增加區塊3〇b . 之光源4〇b的凴暗區間比或電流。控制電路220可由現場可 -規劃邏輯閘陣列（Field Programmable Gate Array; FPGA)或 . 特殊應用積體電路（Application Specific Integrated Ciixuit| ASIC)建構而成。 控制電路220係使用例如脈波調變（puise width Modulated; PWM)訊號。請參照第4圖，其繪示本發明之較 佳實施例之調整前後的電流（或電壓）脈波調變（PWM)訊號 1310859 示思圖，其中方形波5 0為調整前之電流（或電壓）PWM訊CCD), photoelectric crystal or photoresistor. After the block brightness values are transmitted to the brightness comparator 200, the brightness comparator 200 compares the brightness of the block brightness values with the preset brightness values, respectively, to generate a plurality of feedback signals (block brightness comparison results). The feedback signal indicates that the brightness of the block 30a_30b is too high or too low' and the determination of the preset brightness value may be a factory setting value or a user-defined appropriate value. Then, the feedback signals are transmitted to the control circuit 220. The control circuit 220 automatically adjusts the light-dark interval ratio or current of the light sources 40a-40d of the blocks 30a-30d according to the feedback signals, so that the block 30a- The brightness of 3 0d is substantially the same. For example, when the feedback signal of the block 30b indicates that its temperature is too high, the control circuit 220 automatically reduces the light-dark interval ratio or current of the light source 40b of the block 30b; when the blocks 3〇c and 30d are returned When the number indicates that the shell degree is low, the control circuit 220 automatically increases the dark interval ratio or current of the light source 4〇b of the block 3〇b. The control circuit 220 can be constructed by a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Ciixuit (ASIC). The control circuit 220 uses, for example, a pulse width modulation (PWM) signal. Please refer to FIG. 4, which illustrates a current (or voltage) pulse-wave modulation (PWM) signal 1310859 before and after adjustment according to a preferred embodiment of the present invention, wherein the square wave 50 is the current before the adjustment (or Voltage) PWM signal
號，方形波όο為加入高頻訊號調整後之電流（或電壓）pwM 汛號控制電路220可直接改變方形波5〇之亮區52的脈波 -寬度W1 ;或方形波50之暗區54的脈波寬度，來調變光源 ；之売暗區間比。例如：增加亮區52的脈波寬度W1來升高 光源之壳暗區間比；增加暗區52的脈波寬度W2來降低光 -源之亮暗區間比。另外，控制電路220更可加入高頻訊號方 _形波50之亮區52 ’來調變光源之亮暗區間比。如方形波6〇 所示，加入高頻訊號可將原來之亮區52分割成複數個亮區 62以減；方形波60亮區部分所佔的比例，因而降低光源 之亮暗區間比。 ^又本發明可更包括直流交流轉換器（lnverter)2 10，其 係電性連接於控制電路22〇與光源4〇a_4〇d之間。 、由上述本發明較佳實施例可知，本發明可有效地調整光 源的冗暗區間比或電流，來使掃描式背光模組中各區塊的亮 %度實質相同，因而克服習知之掃描式背光模組之區塊亮度不 均勻的缺點。 ； 〜雖然本發明已以一較佳實施例揭露如上，然其並非用以 ^疋本發明，任何熟習此技藝者，在不脫離本發明之精神和 ' 2園内，當可作各種之更動與潤飾，因此本發明之保護範圍 當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例能 10 1310859 更明顯易懂’所附圖式之詳細說明如下： 第i圖係繪示習知之掃描式背光模組的結構示意圖。 第2A圖和第2B圖係分別描述應用本發明之亮度調整 方法之前和之後的光源和區塊的狀態。 第3圖係繪示本發明之較佳實施例之掃瞄式背光模組 的功能方塊示意圖。 第4圖係繪示本發明之較佳實施例之調整前後的電流 (或電壓）脈波調變（PWM)訊號示意圖。 【主要元件符號說明】 10 殼體 20a、20b、20c、20d、20e 區隔物 30a ' 30b ' 30c ' 30d 區塊 30a、30b、30c、30d 光源 50、60 方形波 52 ' 62 亮區No., square wave ό ο is added to the high frequency signal adjusted current (or voltage) pwM 汛 控制 control circuit 220 can directly change the pulse wave width Width W1 of the square wave 5 ; bright area 52; or the dark area 54 of the square wave 50 The pulse width is used to modulate the light source; For example, increasing the pulse width W1 of the bright area 52 to increase the ratio of the dark side of the light source; increasing the pulse width W2 of the dark area 52 to reduce the light-dark interval ratio of the light source. In addition, the control circuit 220 can further add the bright area 52 ′ of the high-frequency signal _shaped wave 50 to modulate the light-dark interval ratio of the light source. As shown by the square wave 6〇, adding the high frequency signal can divide the original bright area 52 into a plurality of bright areas 62 to reduce; the proportion of the bright area of the square wave 60, thereby reducing the ratio of light to dark of the light source. Further, the present invention may further include a DC converter (lnverter) 2 10 electrically connected between the control circuit 22 and the light source 4A_4_d. According to the preferred embodiment of the present invention, the present invention can effectively adjust the redundancy ratio or current of the light source, so that the brightness percentage of each block in the scanning backlight module is substantially the same, thereby overcoming the conventional scanning type. The disadvantage of uneven brightness of the block of the backlight module. The present invention has been disclosed in a preferred embodiment as described above, but it is not intended to be used in the present invention, and any person skilled in the art can make various changes without departing from the spirit of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention can be more clearly understood. The detailed description of the drawings is as follows: Figure i shows a conventional scanning backlight Schematic diagram of the module. Figs. 2A and 2B are diagrams respectively showing states of light sources and blocks before and after applying the brightness adjustment method of the present invention. Figure 3 is a block diagram showing the function of a scanning backlight module in accordance with a preferred embodiment of the present invention. Figure 4 is a schematic diagram showing current (or voltage) pulse-wave modulation (PWM) signals before and after adjustment in accordance with a preferred embodiment of the present invention. [Main component symbol description] 10 Housing 20a, 20b, 20c, 20d, 20e Compartment 30a ' 30b ' 30c ' 30d Block 30a, 30b, 30c, 30d Light source 50, 60 Square wave 52 ' 62 Bright area
54 、 64 暗區 100a、100b、100c、100d 光感測元件 200 亮度比較器 210 直流交流轉換器 220 控制電路 A、B、C、D 亮度 W1 脈波寬度 W2 脈波寬度54 , 64 Dark area 100a, 100b, 100c, 100d Light sensing element 200 Brightness comparator 210 DC to AC converter 220 Control circuit A, B, C, D Brightness W1 Pulse width W2 Pulse width