200929134 九、發明說明： 【發明所屬之技術領域】 本發明係有關一種回授技術’特別是關於一種穩定顯示面板亮度 之驅動方法及其迴授裝置。 【先前技術】 隨著光電產業的蓬勃發展，以前傳統的映像管螢幕因為體積過 大’所以逐漸被液晶螢幕或者是電漿電視所取代，再加上電腦是現代 人上班和在家娛樂的重要工具之一，所以液晶螢幕亦成為目前不可或 0缺的科技產品。液晶螢幕包括一背光模組，而此背光模組需要一發光 源，通常發光源可以為冷陰極螢光管及熱陰極螢光管、發光二極體及 電激發光片等其中之一。 若發光源為發光二極體時，通常會伴隨使用一種多區塊發光二極 體背光源技術，因為使用此種技術不只可以增加液晶模組的色彩範 圍、廣角、對比度與節省電源等優點，還可以調整顯示器的灰階與降 低背光模組的輝度。但是由於以發光二極體為背光源的背光模組會因 為在長時間的工作下伴隨熱效應的影響，造成其功能退化，所以顯示 器的輝度與色度會無法保持穩定。雖然可以在一面板上的各區塊設置 〇 -光_器’糊光細H來細光並校正各區塊的亮度不過成本 過尚，在生產上不易達到。如果只設置一光感測器，除了安置位置不 易，也會影響光之光型。 再者，如第1圖所示，設置一光感測器12在一顯示面板1〇上， 利用它來债測到-距離較遠且當時亮度較低的發光區塊14時則偵測 到，亮，就不準確。除此之外，在同一亮度下若要不斷在短時間摘測 ，區塊焭度，則各發光二極體必須要增加電流來彌補亮度的差距，可 疋這樣一來，發光二極體的發光效率就會降低，不符合市場需求。 因此，本發明係在針對上述之因擾，提出一種穩定顯示面板亮度 之驅動方法及其迴授裝置，不僅可以避免更高的成本支出，更可以在 5 200929134 不增加光偵測器的數量下，提高面板亮度的穩定性。 【發明内容】 本發明之主要目的，在於提供一種穩定顯示面板亮度之驅動方法 及其迴授裝置，其係可以有效穩定顯示面板的輝度、色度與亮度。 本發明之另一目的，在於提供一種穩定顯示面板亮度之驅動方法 及其迴授裝置，其係可以節省顯示器裡背光模組之成本支出。 本發明之再一目的，在於提供一種穩定顯示面板亮度之驅動方法 及其迴授裝置，其係可以降低光感測器之使用數量。 〇 為達上述目的’本發明提供一種穩定顯示面板亮度之迴授裝置， 包含複數顆發光二極體，其係用來提供一發光源，而該些發光二極體 電性連接至至少一電流/電壓偵測器，可偵測每一該發光二極體之一組 第一電信號，在一顯示面板上設有一光感測器，其係用來偵測顯示面 板上每一區塊之一亮度後，並轉換該亮度成一第二電信號，該電流/電 壓偵測器與該光感測器電性連接至一微處理器，使其可接收該第一電 化號與該第二電信號，並利用每一該區塊在初始時的第一亮度值來計 算每一該區塊之亮度變化，藉以調整該些發光二極體之電流，而還有 至少一驅動電路，其中一端電性連接該微處理器，另一端電性連接至 Ο該些發光二極體，而該驅動電路可以提供該些發光二極體所需要的電 流’進而控制每一該區塊之該亮度。 本發明亦提供一種穩定顯示面板亮度之驅動方法，首先記錄在顯 示面板上複數區塊在初始時之一第一亮度值，其中該第一亮度值由各 發光二極體之一初始内阻計算出來，再來利用各發光二極體之一組工 作^數得到每-區塊工作中之-第二亮度值，之後把第二亮度值與第 一免度值加以計算可以得知每一區塊之亮度變化量。 茲為使貴審查委員對本發明之結構特徵及所達成之功效更有進 一步之瞭解與認識，謹佐以較佳之實施例圖及配合詳細之說明，說明 如後： 6 200929134 【實施方式】 本發明係為一種穩定顯示面板亮度之堪動方法及其迴授裝置，其 係可使用在穩定顯示面板的亮度，進而穩定其色度與輝度，讓這些特 性不容易因為長時間影響而退化。另外本發明也可以在減少光感測器 的使用數量下達到上述的目的，此為更加難得。 本發明可應用於一種可穩定亮度之顯示裝置上，該顯示裝置包含 顯示面板及背光模組，背光模組將光線照射在顯示面板上，而背光模 組由本發明之回授裝置所構成，利用其驅動方法就可順利運作。 Ο Ο 請參閱第2圖，此為本發明之迴授裝置示意圖。該裝置係包含複 數顆發光二極體16，其係用來提供一發光源，而發光二極體16可電 性連接至一電流/電壓偵測器24,此電流/電壓偵測器24用來偵測每一 顆發光二極體16之一組第一電信號，例如順向電流與順向電壓；一光 感測器22，用來偵測一顯示面板上每一區塊之一亮度後，並轉換該亮 度成一第二電信號，而該光感測器22除了可以偵測紅、藍、綠光之外， 還可偵測白光；一微處理器18，其係電性連接至電流/電壓偵測器24 與光感測器22，用以接收第一電信號與第二電信號，並利用每一區塊 在初始時的第-亮度值來計算每—區塊之亮度變化，藉以調整發光二 極體16之電流；以及一驅動電路2〇，其中一端電性連接微處理器， 另一端電性連接至發光二極體16，而驅動電路2〇可以提供發光二極 體16所需要的電流，進而控制每一區塊之發光亮度。 本發明利用-種购方絲雜上述的迴授裝置，制時參閱第 =圖，首先如步驟S1所示，記錄在顯示面板上複數區塊在初始時之 ，亮度值，第一亮度值可由發光二極體的初始内阻值計算出來。 ，著’如β步驟S2所示，用電流/電壓侧器24偵測每一顆發光二極體 一6的所得之參數，即順向電流與順向電壓，以算出每一區塊工作中之 一第二亮度值。再來’如步驟S3，利用第二亮度值與第—亮度值 出每一區塊之一亮度變化量。 7 200929134 回到 光二極體16所需之 ，行步驟S5，其係計算並調整發 度變動之每-區塊上的加^要而減少或增加電流，此時亮 是否到預嗖值1^，1里1。接著進行步驟S6’判斷計數器 感測器22偵測該計數器所處之 如果為疋，則可以用先 第-;塊作巾之亮度，並該亮度與 如步it 依獅轉紐正各贱二減之電流， S2。料咖職器，如第5 ❹ Ο :=t=發光二極體16為循序點亮，則於第三區塊32至 值校正各奸二亮編作—絲值，依據該差異 明繼續參閱第3B圖，步驟S2還包含步驟從至步驟S28。首 诗^驟S22所不’電流/電_測器24偵測各發光二極體16之 參數；接著進行步驟S24，其係利用該卫作參數計算各發光二 和體6工作中之一内阻值’再進行步驟％，由各發光二極體16的接 面溫度與内__和_值得到各發光二極體16王作巾之一接面 溫度值，如第4A圖所示，最後步驟S28是由各舰二極體16的亮度 值與接面域隱和該接面溫度值㈣卫作中在每—區塊之該第二亮 度值，可以參閱第4B圖。另外在步驟S2當中可逐一區塊或逐一群組 區塊偵測來得到每-紐塊讀巾之第二亮度值，這樣—來就不需要 用f光感· 22對每_區塊倾時間的細了 '综上所述，本發明除 了可以穩麵示面板的亮度，進而敎其輝度與色度，還可以在減少 光感測器制數f的前提之下，達成上述的目的，節賴示器裡背光 模組的成本支出。而且在本發明中也不用擔心遠方區塊亮度太弱的問 題，因為只要等待區塊亮度到一適當亮度之上，再用光感測器進行偵 測即可。 8 200929134 以上所述者，僅為本發明一較佳實施例而已，並非用來限定本發 明實施之範圍’故舉凡依本發明巾請專利範圍所述之形狀、構造特 徵及精神所為之均等變化補^，均應包括於本發明之巾請專利範圍 【圖式簡單說明】 第1圖為習知技術在顯示面板上偵測各區塊之示意圖。 第2圖為本發明之裝置電路示意圖。 第3A圖以及第3B圖為本發明之方法流程圖。 第4A圖為發光二極體的内阻與接面溫度之關係曲線圖。 第4B圖為發光二極體的亮度值與接面溫度之關係曲線圖。 第5圖為本發明在顯示面板上偵測各區塊之示意圖。 【主要元件符號說明】 10顯示面板 12光感測器 14發光區塊 16發光二極體 18微處理器 0 20驅動電路 22光感測器 24電流/電壓偵測器 26顯示面板 28第一區塊 30 第二區塊 32第三區塊 34第四區塊 36光感測器 9200929134 IX. Description of the Invention: [Technical Field] The present invention relates to a feedback technique, particularly to a driving method for stabilizing the brightness of a display panel and a feedback device therefor. [Prior Art] With the booming development of the optoelectronic industry, the traditional image tube screen was replaced by LCD screen or plasma TV because of its excessive size, and the computer is an important tool for modern people to go to work and entertain at home. First, the LCD screen has become a technology product that is currently unavailable or lacking. The liquid crystal screen comprises a backlight module, and the backlight module needs a light source. Generally, the light source may be one of a cold cathode fluorescent tube and a hot cathode fluorescent tube, a light emitting diode and an electroluminescent sheet. If the light source is a light-emitting diode, a multi-block LED backlight technology is usually used, because the use of this technology can not only increase the color range, wide angle, contrast and power saving of the liquid crystal module. It is also possible to adjust the gray scale of the display and reduce the brightness of the backlight module. However, since the backlight module with the backlight of the light-emitting diode is degraded due to the influence of thermal effects under a long period of operation, the luminance and chromaticity of the display cannot be stabilized. Although it is possible to set the 〇-光_器' paste light H in each block on a panel to fine-tune and correct the brightness of each block, the cost is too high, and it is difficult to achieve in production. If only one light sensor is set, it will affect the light type except for the placement position. Furthermore, as shown in FIG. 1, a photo sensor 12 is disposed on a display panel 1 to detect that the light-emitting block 14 is far away and has a low brightness at that time. , bright, it is not accurate. In addition, in the same brightness, if you want to continuously measure and block in a short time, each light-emitting diode must increase the current to compensate for the difference in brightness. In this way, the light-emitting diode The luminous efficiency will be reduced and it will not meet the market demand. Therefore, the present invention provides a driving method for stabilizing the brightness of a display panel and a feedback device thereof for the above-mentioned disturbance, which can not only avoid higher cost, but also can increase the number of photodetectors without increasing the number of photodetectors at 5 200929134. Improve the stability of the panel brightness. SUMMARY OF THE INVENTION The main object of the present invention is to provide a driving method for stabilizing the brightness of a display panel and a feedback device thereof, which can effectively stabilize the brightness, chromaticity and brightness of the display panel. Another object of the present invention is to provide a driving method for stabilizing the brightness of a display panel and a feedback device thereof, which can save the cost of the backlight module in the display. Still another object of the present invention is to provide a driving method for stabilizing the brightness of a display panel and a feedback device thereof, which can reduce the number of use of the photo sensor. The present invention provides a feedback device for stabilizing the brightness of a display panel, comprising a plurality of light emitting diodes for providing a light source, and the light emitting diodes are electrically connected to at least one current a voltage detector for detecting a first electrical signal of each of the light-emitting diodes, and a light sensor disposed on a display panel for detecting each block on the display panel After a brightness, the brightness is converted into a second electrical signal, and the current/voltage detector is electrically connected to the optical sensor to a microprocessor to receive the first aging number and the second Signaling, and using each of the first brightness values of the block to calculate a brightness change of each of the blocks, thereby adjusting currents of the light-emitting diodes, and at least one driving circuit, wherein one end is electrically The microprocessor is connected to the microprocessor, and the other end is electrically connected to the LEDs, and the driving circuit can provide the current required by the LEDs to control the brightness of each of the blocks. The invention also provides a driving method for stabilizing the brightness of the display panel, first recording a first brightness value of the plurality of blocks at the initial time on the display panel, wherein the first brightness value is calculated from an initial internal resistance of each of the light emitting diodes Coming out, using one of the working groups of each of the light-emitting diodes to obtain a second brightness value in each-block operation, and then calculating the second brightness value and the first degree of freedom value to know each area The amount of change in the brightness of the block. For a better understanding and understanding of the structural features and the achievable effects of the present invention, the preferred embodiments and the detailed description are as follows: 6 200929134 [Embodiment] It is a method for stabilizing the brightness of the display panel and its feedback device, which can be used to stabilize the brightness of the display panel, thereby stabilizing its chromaticity and luminance, so that these characteristics are not easily degraded due to long-term effects. Further, the present invention can achieve the above object while reducing the number of use of the photo sensor, which is more difficult. The present invention can be applied to a display device capable of stabilizing brightness. The display device includes a display panel and a backlight module. The backlight module illuminates the display panel, and the backlight module is composed of the feedback device of the present invention. Its driving method works smoothly. Ο Ο Please refer to Fig. 2, which is a schematic diagram of the feedback device of the present invention. The device includes a plurality of light emitting diodes 16 for providing a light source, and the light emitting diode 16 is electrically connected to a current/voltage detector 24, and the current/voltage detector 24 is used. Detecting a first electrical signal of each of the LEDs 16, such as a forward current and a forward voltage; and a photo sensor 22 for detecting the brightness of each of the blocks on a display panel Afterwards, the brightness is converted into a second electrical signal, and the photo sensor 22 can detect white light in addition to red, blue and green light; a microprocessor 18 is electrically connected to The current/voltage detector 24 and the photo sensor 22 are configured to receive the first electrical signal and the second electrical signal, and calculate the luminance change of each block by using the initial first luminance value of each block. The driving circuit 2 is electrically connected to the microprocessor, and the other end is electrically connected to the LED 16 , and the driving circuit 2 提供 can provide the LED The required current is 16 to control the brightness of each block. The invention utilizes the above-mentioned feedback device of the square wire, and refers to the first figure in the manufacturing process. First, as shown in step S1, the plurality of blocks are recorded on the display panel at the initial time, the brightness value, the first brightness value can be The initial internal resistance of the light-emitting diode is calculated. , as shown in the step S2, the current/voltage side device 24 detects the obtained parameters of each of the light-emitting diodes 6, that is, the forward current and the forward voltage, to calculate the operation of each block. One of the second brightness values. Then, as in step S3, the brightness value of one of each block is used by the second brightness value and the first brightness value. 7 200929134 Back to the light diode 16 is required, in step S5, it calculates and adjusts the summation on each block of the fluctuation of the fluctuation to reduce or increase the current, and at this time, whether the light reaches the pre-value 1 ^ , 1 in 1. Then, in step S6', it is determined that the counter sensor 22 detects that the counter is located as 疋, then the first -; block can be used as the brightness of the towel, and the brightness is as follows: Reduced current, S2. The servant, such as the 5th ❹ = :=t= illuminating diode 16 is sequentially illuminated, then in the third block 32 to the value correction 各 亮 亮 — — — — — — — — — — — — — — — — — — In FIG. 3B, step S2 further includes the step from step S28 to step S28. The first poem S22 does not 'current/electricity detector 24 detects the parameters of each of the light-emitting diodes 16; then proceeds to step S24, which uses the guard parameters to calculate one of the operations of each of the light-emitting diodes 6 The resistance value is further step %, and the junction temperature of each of the light-emitting diodes 16 is obtained from the junction temperature of each of the light-emitting diodes 16 and the internal __ and _ values, as shown in FIG. 4A. The final step S28 is performed by the brightness value of each ship diode 16 and the junction area and the junction temperature value (4). The second brightness value in each block is referred to FIG. 4B. In addition, in step S2, the second brightness value of each of the block readings can be obtained one by one or one by one group block detection, so that there is no need to use f light sense 22 to tilt each time block In summary, the present invention can not only stabilize the brightness of the panel, but also its brightness and chromaticity, and can also achieve the above purpose under the premise of reducing the number of photosensors f. The cost of the backlight module in the display. Moreover, in the present invention, there is no need to worry about the problem that the brightness of the remote block is too weak, because it is only necessary to wait for the brightness of the block to be above a proper brightness, and then use the light sensor for detection. 8 200929134 The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the practice of the present invention. Therefore, the shape, structural features and spirit described in the patent scope of the present invention are equally varied. The supplementary method should be included in the scope of the patent application of the present invention [Simplified description of the drawings] Fig. 1 is a schematic view showing the detection of each block on the display panel by the prior art. Figure 2 is a schematic diagram of the circuit of the device of the present invention. 3A and 3B are flow charts of the method of the present invention. Fig. 4A is a graph showing the relationship between the internal resistance of the light-emitting diode and the junction temperature. Fig. 4B is a graph showing the relationship between the luminance value of the light-emitting diode and the junction temperature. FIG. 5 is a schematic diagram of detecting blocks in a display panel according to the present invention. [Main component symbol description] 10 display panel 12 light sensor 14 light block 16 light emitting diode 18 microprocessor 0 20 drive circuit 22 light sensor 24 current / voltage detector 26 display panel 28 first area Block 30 second block 32 third block 34 fourth block 36 light sensor 9