583618 五、發明說明（l) " -- 【發明領域】 ^本發明係為一種液晶顯示器自動亮度控制的光感應器 才又正方法追加一，係針對專利申請第〇 g 〇丨〇丨〇 8 9號發明專 利案提出追加專利，以對母案提出進一步改良。 【發明背景】 利用光敏電阻（CDS)作為光感應器（Light Sens〇r)以 ^制液晶顯不為（Liquid Crystal Display ; LCD)的背光 冗度日守’可大幅降低硬體成本，但由於光敏電阻本身的阻 值秩差很大，使得操作在自動模式時，光感應器的輸出值 P返著不同的光敏電阻元件而有相當大的差異。事實上此差 異並未造成光感應電路的誤動作，而僅是輸出範圍依不同 的光敏電阻而有所不同，因此，造成在工廠大量生產時的 困擾’往往不知道感應器的輸出是否為可接受的範圍而浪 費了相當多重複檢驗電路的時間，甚至影響出貨的品質與 進度。 、 、/' 習知技術中’利用光敏電阻（CDS)1〇〇作為光感應器 (Light Sensor)以控制液晶顯示器（Liquid Crystal583618 V. Description of the invention (l) "-[Field of invention] ^ The present invention is a light sensor for automatic brightness control of a liquid crystal display, which is only added to the method, and is for patent application No. 0g 〇 丨 〇 丨 〇 8 The 9th invention patent case proposed additional patents to propose further improvements to the mother case. [Background of the Invention] The use of a photoresistor (CDS) as a light sensor (Light Sensor) to reduce the backlight redundancy of the liquid crystal display (Liquid Crystal Display; LCD) can significantly reduce hardware costs, but because The photoresistor itself has a large resistance rank difference, so that when operating in the automatic mode, the output value P of the light sensor returns to different photoresistor elements and there is a considerable difference. In fact, this difference does not cause the malfunction of the light-sensing circuit, but only the output range is different depending on the different photoresistors. Therefore, it causes trouble in mass production in the factory. Often it is not known whether the output of the inductor is acceptable Range and waste a considerable amount of time to repeatedly check the circuit, and even affect the quality and progress of the shipment. In the conventional technology, the photoresistor (CDS) 100 is used as a light sensor to control the liquid crystal display (Liquid Crystal
Display , LCD)的背光亮度，如第j圖所示，將環境亮度轉 成數位資料係以一類比/數位轉換器（ADC)1 1〇來完成，不 論A DC 11 0内含或外加微處理器丨2 〇成本皆很高，且若感光 板（Sensor Board)130與微處理器12〇分開設計時，連接訊 號資料線至少需要8條傳輸線140。 而另一節省成本的技術，亦利用光敏電阻（CDS) 2〇 作 為光感應器（Light Sensor)以控制液晶顯示器（Li qUi#Display, LCD) backlight brightness, as shown in Figure j. The conversion of ambient brightness into digital data is done with an analog / digital converter (ADC) 1 10, whether A DC 11 0 contains or adds microprocessing The cost of the device is very high, and if the sensor board 130 and the microprocessor 12 are designed separately, at least 8 transmission lines 140 are required to connect the signal data line. Another cost-saving technology also uses a photoresistor (CDS) 20 as a light sensor to control the liquid crystal display (Li qUi #
583618 五、發明說明（2)583618 V. Description of Invention (2)
Crystal Display ; LCD)的背光亮度，如第2圖所示，係以 電壓控制振盪器（Voltage-Controlled Oscillator 2 1 0來將環境亮度轉成某一頻率，送到微處理器2 2 〇計算其 頻率週期’就可得知亮度變化，且若感光板（Sens〇r β 〇 a r d ) 2 3 0與微處理器2 2 0分開設計時之連接訊號，其資料 線只需一條資料2 4 0 ’不僅成本較低，且零件取得亦較容' 易，以電壓控制振盪器210的價格約ADC 1〇〇的十分之一。 但是單以ADC 110或電壓控制振盪器21〇作為液晶顯示器自 動党度控制的裝置時，尚無法針對不同的光感應器的特性 ’做不同輸出範圍值的設定，而無法強化電路的穩定性， 除非更動硬體線路的設計，但是又耗費成本， 效益。 κ |7Γ' 止ί:!、請第0 9 0 1 0 1 089號「液晶顯示器自動亮度控制 的光感應為板正方法」發明專利宰 一德访曰韶—叫Α 4 > 才〜木、以下間％母案）揭露了 .^ ^ ζ ζ, 冗度控制的光感應器校正方法，由於 圍的控制階數，母案實際的特點，設計一辦 進焭度耗圍的控制階數為一關注的議題。 曰 【發明之概述及目的】 、 本發明係應用一軟體校正程序，用以裎徂叮接★+ 主要目的在於解決因不同二=·?器校正方法。其 誤差範圍，而所造成液a顯二為（Llght Sensor)有不同 題。 ’日日”、、、不裔自動亮度控制失真的問 本發明所揭露的液晶顯 口口自動焭度控制的光感應器Crystal Display; LCD) The brightness of the backlight, as shown in Figure 2, uses a voltage-controlled oscillator (Voltage-Controlled Oscillator 2 10) to convert the ambient brightness to a certain frequency and sends it to the microprocessor 2 2 0 to calculate it. The frequency period 'can be used to know the brightness change, and if the sensor board (Sens〇r β 〇ard) 2 3 0 and the microprocessor 2 2 0 are designed separately, the connection signal requires only one data 2 4 0' Not only is the cost lower, but the parts are also easier to obtain. The price of the voltage-controlled oscillator 210 is about one-tenth of the ADC 100. However, the ADC 110 or the voltage-controlled oscillator 21 alone is used as the LCD automatic party. In the case of a device with a degree control, it is not yet possible to set different output range values according to the characteristics of different light sensors, and it is not possible to enhance the stability of the circuit, unless the design of the hardware circuit is changed, but it costs costs and benefits. Κ | 7Γ 'Only: Please, No. 0 9 0 1 0 1 089 "Light Induction for Automatic Brightness Control of LCD Monitors as a Method of Panel Correction" Invention Patent Zai Yide's Interview with Yue Shao—called Α 4 > (%% mother cases) revealed. ^ ζ ζ, the photo sensor correction method for redundancy control. Due to the control order of the range and the actual characteristics of the mother case, designing a control order to improve the range of the degree of consumption is an issue of concern. [Summary and purpose of the invention] The present invention applies a software calibration program for 裎 徂 ding connection. + The main purpose is to solve the two different device calibration methods. Its error range, and the resulting liquid a is two (Llght Sensor) has different problems. "Day, day, day, day, day, day, day, day, day, day, day, day, day, day, day and night, the automatic brightness control distortion problem of the present invention
583618 五、發明說明（3) 校正方 >=，至少包含下列步驟：首先建立一環境亮度與液 晶顯示器面板亮度控制的匹配對應範圍表；藉由光感應器 產生輸入笔壓Λ號，將輸入電壓訊號輸入至_運算放大 為 並產生放大訊號；接著將放大訊號輸入至一電壓控 制振盪器，並產生一輸出頻率；提供選擇一對應範圍，並 設定最大、中間及最小值；最後對照該匹配對應範圍表， 將該輸出頻率輸入一微處理器，並輸出一控制訊號以控制 並校正該液晶顯示器背光板之亮度。 有關本發明之詳細内容及技術，茲就配合圖式說明如 下： 【發明之詳細說明】 本發明提出一種液晶顯示器自動亮度控制的光感應器 校正方法，主要在於輔助液晶顯示器自動亮度控制的光感 應器的輸出校正，再藉由一微處理器的控制，達到液晶顯 示斋自動壳度控制的目的。其中，第3圖為本發明利用Q ρ 與VCO作為液晶顯示器自動亮度控制的電路示意圖，亦即 利用光敏電阻（008) 300作為光感應器（1^抑1：861^〇1*)以控 制液晶顯示器（Liquid Crystal Display ;LCD) 340 的背光 焭度’將光敏電阻（CDS)300感應的輸出訊號經一運算放大 器（OP) 30 5放大後，再透過一電壓控制振盪器（v〇Uage 一 Controlled Oscillator ;^0)31〇來將環境亮度轉成某一 頻率，送到微處理器320計算其頻率週期，再由該微處瑄 器32〇輸出脈衝寬度調變（PWM)，以控制液晶顯示器34〇> 光板的亮度。而輸入該電壓控制振盡器31()的訊號係在接583618 V. Description of the invention (3) Correction method> =, at least including the following steps: First, establish a matching range table of the ambient brightness and the brightness control of the liquid crystal display panel; use the light sensor to generate the input pen pressure Λ number and input The voltage signal is input to the _ operation and amplified to generate an amplified signal; then the amplified signal is input to a voltage-controlled oscillator and an output frequency is provided; a corresponding range is provided for selection, and the maximum, middle, and minimum values are set; finally, the matching is compared with the matching Corresponding to the range table, the output frequency is input to a microprocessor, and a control signal is output to control and correct the brightness of the backlight panel of the liquid crystal display. The detailed content and technology of the present invention will be described in conjunction with the drawings as follows: [Detailed description of the invention] The present invention proposes a light sensor calibration method for automatic brightness control of a liquid crystal display, which mainly lies in the light sensor assisting the automatic brightness control of the liquid crystal display. The output of the controller is calibrated, and then controlled by a microprocessor to achieve the purpose of automatic shell control of the LCD display. Among them, FIG. 3 is a schematic circuit diagram of the present invention using Q ρ and VCO as automatic brightness control of a liquid crystal display, that is, using photoresistor (008) 300 as a light sensor (1 ^ 1: 861 ^ 〇1 *) to control Liquid crystal display (Liquid Crystal Display; LCD) 340 backlight brightness' amplified the output signal sensed by the photoresistor (CDS) 300 through an operational amplifier (OP) 30 5 and then through a voltage controlled oscillator (v〇Uage- Controlled Oscillator; ^ 0) 31〇 to convert the ambient brightness to a certain frequency, send it to the microprocessor 320 to calculate its frequency period, and then the micro processor 32 outputs pulse width modulation (PWM) to control the liquid crystal Display 34 > Brightness of light plate. The signal input to the voltage control oscillator 31 () is connected.
弟6頁 583618 五、發明說明（4) "' =而透過一分壓電阻33〇的設計，使光敏電阻依據不同 哭认值而產生不同的輸入電壓（Vi)，再依據電壓控制振盪 口口輪出相對應的輪出頻率（v〇) 〇 而第4圖為本發明利用肿與^〇作為液晶顯示器自動亮 又控制的輸入電壓與輸出頻率關係圖，由第4圖可知，輸 入電壓與輸出頻率係成一反比關係，因應此關係特性，可 以Ϊ立二大範圍的對照表，以容忍光敏電阻（CDS) 30 0本身 =誤差fe圍，並導入一軟體校正程序，將滿足藉由微處理 為控制液晶顯示器背光板的亮度需求。 而第5圖為本發明之液晶顯示器自動亮度控制的光感 $器校正方法流程圖。首先，建立一環境亮度與液晶顯示 為面板亮度控制匹配對應範圍表（步驟5 〇 〇 )，此亮度範圍 可設定成複數個設定值（複數階），以本發明為例，在第一 階時設定成0〜31共32個設定值，用以定義80 0 LUX亮度自 動對應為3 1，3 5 0 LUX亮度自動對應為〇 ;在第二階時，此 免度範圍設定成0〜31共32個設定值，用以定義750 LUX亮 度自動對應為3 1 ’ 3 0 0 L U X免度自動對應為〇，以此類推； 待定義完環境亮度匹配對應範圍後（步驟5 〇 〇 )，選擇進入 工廠校正作業程序，並藉由光感應器產生一輸入電壓訊號 (步驟510);將該輸入電壓訊號輸入至一運算放大器，並 產生一放大A 5虎（步驟5 2 0 )，將該放大訊號輸入至一電壓 控制振盪器’並產生一輸出頻率（步驟5 3 0 );並進入液晶 顯示器自動亮度控制的光感應器校正流程；並提供選/彝一 對應範圍，並設定最大、中間及最小值（步驟5 4 0 )，壽設Brother page 6 583618 V. Description of the invention (4) " 'And through the design of a voltage divider resistor 33 °, the photoresistor generates different input voltages (Vi) according to different values, and then controls the oscillation port according to the voltage. Corresponding wheel-out frequency (v〇) of the mouth wheel-out, and FIG. 4 is a diagram of the relationship between the input voltage and the output frequency using the swell and ^ 〇 as the liquid crystal display to automatically turn on and control. As can be seen from FIG. 4, the input voltage It is inversely proportional to the output frequency. Based on the characteristics of this relationship, two large-scale comparison tables can be established to tolerate the photoresistor (CDS) 30 0 itself = error range, and a software calibration program will be introduced, which will meet the The process is to control the brightness requirements of the LCD backlight panel. FIG. 5 is a flowchart of a method for correcting a light sensor for automatic brightness control of a liquid crystal display of the present invention. First, a table of corresponding ranges of ambient brightness and liquid crystal display for panel brightness control matching is established (step 500). This brightness range can be set to a plurality of setting values (complex order). Taking the present invention as an example, in the first order, It is set to a total of 32 setting values from 0 to 31, which is used to define 80 0 LUX brightness automatically corresponds to 3 1, 3 50 0 LUX brightness automatically corresponds to 0; in the second stage, this exemption range is set to 0 to 31 32 setting values, used to define 750 LUX brightness automatically corresponds to 3 1 '3 0 0 LUX exemption automatically corresponds to 0, and so on; After defining the environment brightness matching corresponding range (step 5 〇〇), choose to enter The factory corrects the operation procedure, and generates an input voltage signal by the optical sensor (step 510); inputs the input voltage signal to an operational amplifier, and generates an amplified A 5 tiger (step 5 2 0), and the amplified signal Input to a voltage-controlled oscillator 'and generate an output frequency (step 5 3 0); and enter the light sensor calibration process of the automatic brightness control of the LCD; and provide a corresponding range of selection / Yi, and set the maximum, middle and Minimum value (step 5 4 0), set
第7頁 583618 五、發明說明（5) 定完參數後，對照匹配對應範圍表，將輪出頻率輸入一微 處理器，並輸出一控制訊號以控制並校正液晶顯示器背光 板之亮度（步驟550 )。本發明係以 电i徑制振盪器（VCO) 310作為轉換環境亮度的裝置為例，其透過微處理器輸出 的控制訊號，係為一脈衝寬度調變（PWM)。而套用習知運 =類比/數位轉換器（ADC)來作為轉換環境亮度的裝置而 i、f 滿足校正光敏電阻（CDS)本身的誤差範圍’亦 了達到精確的校正效果。 雖然本發明 用以限定本發明 精神和範圍内， 保護範圍當視後 以岫述之較佳貫施例揭露如上，然其並非 丄任何熟習此技藝者’在不脫離本發明之 當可作些許之更動與潤飾，因此本發明之 附之申請專利範圍所界定者為準。Page 7 583618 5. Description of the invention (5) After setting the parameters, check the matching range table, input the round-out frequency to a microprocessor, and output a control signal to control and correct the brightness of the LCD backlight panel (step 550). ). In the present invention, an electric diameter oscillator (VCO) 310 is used as an example of a device for converting ambient brightness. The control signal output by the microprocessor is a pulse width modulation (PWM). And applying the conventional analog = digital converter (ADC) as a device to convert the ambient brightness, and i, f meet the error range of the corrected photoresistor (CDS) itself, and also achieve accurate correction effect. Although the present invention is used to limit the spirit and scope of the present invention, the scope of protection is disclosed as the above-mentioned preferred embodiments after viewing, but it is not intended for anyone skilled in the art 'without departing from the present invention. Changes and retouching, therefore, the scope of the patent application attached to the present invention shall prevail.
第8頁 583618Page 8 583618
顯示器自動亮度控制的電路 第1圖為習知利用ADC作為液晶 示意圖； 第2圖為習知利用VCO作為液晶 示意圖； 顯示器自動亮度控制的電路 顯示器自動亮度控制 第3圖為本發明利用〇P與VCO作為液晶 的電路示意圖； 示器自動亮度控制 第4圖為本發明利用〇P與VCO作為液晶顯 的輸入電壓與輸出頻率關係圖；及 第5圖為本發明之液晶 正方法流程圖。 顯不為自動党度控制的光感應器 校 【符號說明】 100，20 0，3 0 0 光敏電阻（CDS) 110 類比/數位轉換器（ADC) 120，22 0，320 微處理器 130，230 感光板（Sensor Board) 140，240 傳輸線 210，310 電壓控制振盪器（VCO) 30 5 運算放大器（OP) 330 分壓電阻 340 液晶顯示器 示器面板亮度控制 電壓訊號 —運算放大器，並 步驟5 0 0 建立一環境党度與液晶顯 匹配對應範圍表 步驟510 藉由光感應器產生一輸入 步驟520 將該輸入電壓訊號輸入至The circuit of the automatic brightness control of the display. Figure 1 is a schematic diagram of the conventional use of an ADC as the liquid crystal; Figure 2 is a schematic diagram of the conventional use of a VCO as the liquid crystal; The circuit of the automatic brightness control of the display. The automatic brightness control of the display. VCO as a liquid crystal circuit diagram; Figure 4 shows the relationship between the input voltage and output frequency of the LCD using OP and VCO as the LCD; and Figure 5 is a flowchart of the liquid crystal positive method of the present invention. Display is not for automatic sensor control [Symbol description] 100, 20 0, 3 0 0 Photoresistor (CDS) 110 Analog / digital converter (ADC) 120, 22 0, 320 Microprocessor 130, 230 Sensor Board 140, 240 Transmission Line 210, 310 Voltage Controlled Oscillator (VCO) 30 5 Operational Amplifier (OP) 330 Dividing Resistor 340 LCD Display Panel Brightness Control Voltage Signal—Operational Amplifier, and Step 5 0 0 Establish a table showing the corresponding range of environmental party and LCD display. Step 510: Generate an input by the light sensor. Step 520: Input the input voltage signal to
第9頁 583618 圖式簡單說明 產生一放大訊號 步驟5 3 0 將該放大訊號輸入至一電壓控制振盪器，並 產生一輸出頻率 步驟540 選擇一對應範圍，並設定最大、中間及最小 值 步驟5 5 0 對照匹配對應範圍表，將輸出頻率輸入一微 處理器，並輸出一控制訊號以控制並校正液晶顯示器背光 板之免度Page 583618 The diagram briefly explains the step of generating an amplified signal. 5 3 0 Input the amplified signal to a voltage controlled oscillator and generate an output frequency. Step 540 Select a corresponding range and set the maximum, middle and minimum steps. Step 5 5 0 Match the corresponding range table, input the output frequency to a microprocessor, and output a control signal to control and correct the immunity of the backlight panel of the LCD