200928398 九、發明說明： 【發明所屬之技術領域】 本發明與用於檢測一電子装置中之控制電路的技術有 關，尤其涉及具有可調電阻元件之控制電路的撿測技術， 特別是液晶顯示器之亮度控制電路的檢測。4技# 【先前技術】 Ο Ο 基於品質上的要求，許多電子裝置的内部控制電路都 多項的測試項目。針對現有液晶顯示器中的 否要測試當變動該亮度控制電路的輸 ==會使職顯示器的晝一-感知 該亮度控制電路上有一可調電阻 值會隨著使用者的撥轉：從 ===路的輸出電壓，使得該液晶顯示器的 畫面明暗度作對應的變化。 Μ 電阻是正常的情況下，撥轉其上的可調 電壓變動應該是平順的曲線變化， 而面會是漸明或漸暗的平緩變化。然 可調電阻元件所引起的輸綱 :::或漸暗的變化過程發生對應數量== 200928398 為了檢測該亮度控制電路在調整其輸出電壓的過程 中，是否會引起該液晶顯示器的晝面出現人眼可感知的晝 面閃爍現象，目前是用人的手指去撥轉該亮度控制電路上 的可調電阻元件，然後用人眼觀察該液晶顯示器的晝面， 只要觀察到晝面閃爍現象，就將該亮度控制電路視為不良 品。 然而，這種做法完全是用人工方式進行的，麻煩費事 且很沒效率。再者，母個人對於閃爍的感受並不一致，有 ° 些人只能感受到較大的閃爍變化，有些人則可能感受到較 小或更細微的閃爍變化。因此，該亮度控制電路即使通過 某-檢測者的檢測，也不表示它就是良品。這意味著這種 人工檢測該亮度控制電路的方式，其所謂合格與否的定義 並沒有統-的標準，造成其檢測結果的準讀度較低。 【發明内容】 〇 雪技明提供—種用於檢測—控制電路的方法，該控制 調電阻元件供調整其輸出電壓。該方法包括 被驅“期卩It疋件’以變其電阻值。在該可調電阻元件 次取樣結i編控制電路的輸出電壓進行取樣。根據每 乎桿準。°傭μ該控制電路的輸出電壓的變動幅度是否合 果產生相對應的提示訊息。 路。該C一種新的檢測系統’用於檢測該控制電 連接該可調電阻元件，且能 几件改變其電阻值。—A/D轉換器係連接 200928398 該控制電路的輸出端，並以—取樣速度， 輸出電壓進行取樣’及將每次的取樣到的‘轉 =信 及一測试程式女裝於該電腦，且妯勒班上土 該電腦接收該A/D轉換器傳來的數位信號，根據數： k號判斷該控制電路之輸出電壓的變動幅度Μ是^ 標準，及根據判斷結果產生相對應的提示訊息。 σ Ο Ο 本發明上述方法及系統特別適用於檢測一液器 内的亮度控制電路，透過對該亮*' " ,ϊ 亮度控制電路在其輸出電雜 程中是否有大幅變動，如果有代表該 ^生晝面閃爍現象。由於在檢測過程中，不需 夜晶顯示器的背光電源轉換器，也以 P -f- _ - , , / 丨而受通辰Μ顯不器， 文不需要人去觀看該液晶顯示器的書 人力且有效率。 ㈣’相當節省 至於本發明的其它技術内容與更詳說 於隨後的說明。 聆掏路 【實施方式】 第-圖顯示本發明系統之—較佳實施例的方塊圖，其 ^該祕連接-亮度控制電路8，而該亮度控制電路8 雷，出端8。，用於連接—液晶顯示器中的背光電源轉換 90 ’且該冗度控制電路8具有—可調電阻元件^。該 可調電阻元件81具有—轉紐（圖中未示），透過轉動該轉 200928398 紐可以調整該可調電阻元件81的電阻值。當該可調電阻元 件81的電阻值發生變動時，該該亮度控制電路8的輸出電 壓V〇Ut也跟著變動。該輸出電壓Vout的變動會控制該背 光電源轉換電路9Q的運作，因而使得該液晶顯示器的晝面 作對應的明暗度變化。 在、了調電阻元件81在被人調整其電阻值的過程 中，/口、要該輸出電壓Vout是平滑地對應變動，則該液晶顯 *器的畫面明暗度㈣化也會是平滑的，這表*該液晶顯 〇 *器的畫面在變化的過程中，都是漸亮或漸暗的，不會出 現閃爍現象。然而，如果該輸出電壓VGUt在變動的過程 中:有突然變大或突然變小的情形發生，就有可能導致該 液晶顯不器的晝面突然變亮隨後正常，或是突然變暗隨後 正常，也就是晝面發生閃爍現象。 因此’只要檢測該亮度控制電路8之輸出電壓Vout突 然變大或突然變小的變動幅度Δν是否大於一標準值，就 能推知該液晶顯示器的畫面發生閃爍現象。根據發明人研 〇 % ’該鮮值㈣約為Q. IV，也就是誠輸ώ電壓vout 的變動幅度Δν約大於〇. lv時，就會導致該液晶顯示器的 畫面發生閃爍現象。 θ在此例子中，該亮度控制電路8是待測對象，但這只 疋基於方便說明起見，實際上本發明也適用於檢測其它具 有可調整電壓功能之控制電路，特別是具有可調電阻元件 的控制電路。當然’上述的標準值也會因為待測對象的不 同而有所差異。200928398 IX. Description of the Invention: [Technical Field] The present invention relates to a technique for detecting a control circuit in an electronic device, and more particularly to a technique for detecting a control circuit having an adjustable resistance element, particularly a liquid crystal display Detection of the brightness control circuit. 4Tech# [Prior Art] Ο Ο Based on quality requirements, many electronic devices have internal control circuits with multiple test items. For the existing liquid crystal display, it is necessary to test the change of the brightness control circuit when the input == will cause the display of the display - the sense that the brightness control circuit has an adjustable resistance value will be dialed by the user: from == = The output voltage of the circuit causes the screen brightness of the liquid crystal display to change accordingly. Μ If the resistance is normal, the adjustable voltage change on the dial should be a smooth curve change, and the surface will be a gradual change of faded or faded. However, the number of changes caused by the adjustable resistance element::: or the dimming change process corresponds to the number == 200928398 In order to detect whether the brightness control circuit adjusts its output voltage, whether it will cause the surface of the liquid crystal display to appear The blinking phenomenon of the face can be perceived by the human eye. At present, the finger is used to dial the adjustable resistance component on the brightness control circuit, and then the face of the liquid crystal display is observed by the human eye. This brightness control circuit is regarded as a defective product. However, this practice is entirely manual, cumbersome and inefficient. Furthermore, the mother's perception of flicker is not consistent. Some people can only feel large flicker changes, while others may feel smaller or subtle flicker changes. Therefore, the brightness control circuit does not indicate that it is a good product even if it passes the detection of a certain detector. This means that the method of manually detecting the brightness control circuit, the definition of the so-called pass or fail, has no uniform standard, resulting in a lower degree of readability of the test result. SUMMARY OF THE INVENTION A method for detecting a control circuit is provided, which adjusts the output voltage of the resistor. The method includes driving the "Phase It" to change its resistance value. The output voltage of the control circuit is sampled at the sub-sampling junction of the adjustable resistance element. According to each rod, the control circuit is Whether the fluctuation range of the output voltage is equal or not produces a corresponding prompt message. The C. A new detection system 'is used to detect the control to electrically connect the adjustable resistance element, and can change its resistance value by several pieces.-A/ The D converter is connected to the output of the control circuit of 200928398, and is sampled at the sampling speed, the output voltage, and the sample is sent to the computer, and the test program is applied to the computer. The computer receives the digital signal from the A/D converter, determines the fluctuation range of the output voltage of the control circuit according to the number: k, and generates a corresponding prompt message according to the judgment result.上述 上述 The above method and system of the present invention are particularly suitable for detecting a brightness control circuit in a liquid device, by which the brightness control circuit has a large variation in its output electrical cross-range, if Represents the phenomenon of flickering in the surface of the film. Since the backlight power converter of the night crystal display is not required during the detection process, it is also required to be P-f- _ - , , / 丨The person who goes to watch the liquid crystal display is human and efficient. (4) 'Considerable to the other technical contents of the present invention and more detailed in the following description. Listening Road [Embodiment] The first figure shows the system of the present invention. A block diagram of a preferred embodiment, the secret connection-brightness control circuit 8, and the brightness control circuit 8 is a lightning output terminal 8 for connecting a backlight power conversion 90' in the liquid crystal display and the redundancy control circuit 8 has an adjustable resistance element ^. The adjustable resistance element 81 has a - button (not shown), and the resistance value of the adjustable resistance element 81 can be adjusted by rotating the rotation 200928398. When the resistance value of 81 changes, the output voltage V〇Ut of the brightness control circuit 8 also fluctuates. The fluctuation of the output voltage Vout controls the operation of the backlight power conversion circuit 9Q, thus making the liquid crystal display In the process of adjusting the resistance value of the surface resistance element 81, the output voltage Vout is smoothly changed correspondingly, and the screen brightness of the liquid crystal display device is changed. (4) Theization will also be smooth, and the picture of the liquid crystal display will be faded or faded during the change process, and no flicker will occur. However, if the output voltage VGUt is changing In the process: if there is a sudden increase or sudden decrease, it may cause the surface of the liquid crystal display to suddenly become bright and then normal, or suddenly darken and then normal, that is, the surface of the surface flickers. As long as it is detected whether the output voltage Vout of the brightness control circuit 8 suddenly becomes large or suddenly changes, the fluctuation amplitude Δν is larger than a standard value, it can be inferred that the screen of the liquid crystal display flickers. According to the inventor's research 〇%', the fresh value (4) is about Q. IV, that is, the fluctuation range Δν of the voltage vout is about 〇. lv, which causes the screen of the liquid crystal display to flicker. θ In this example, the brightness control circuit 8 is the object to be tested, but this is only for convenience of description. In fact, the present invention is also applicable to detecting other control circuits having an adjustable voltage function, particularly with adjustable resistance. The control circuit of the component. Of course, the above standard values will also vary depending on the object to be tested.
如第一圖所示，本發明系統包括一驅動裝置1、一 A/D 200928398 轉換器 2(ANAL0G TO DIGITAL CONVERTER，ADC)、—電腦 3、 及一測試程式4。該驅動裝置1係連接該亮度控制電路8 的可調電阻元件81，用以驅動該可調電阻元件81改變其 電阻值。例如該驅動裝置1可選用用一步進馬達及一減速 齒組來連接該可調電阻元件81上的轉^以使該步進馬達 能夠傳動該可調電阻元件81上的轉鈕於轉動。其中該步進 馬達的轉速較佳是㈣在使其所㈣之轉_轉速，相同 或接近於該轉紐被人用手正常轉動時的轉速。As shown in the first figure, the system of the present invention includes a driving device 1, an A/D 200928398 converter 2 (ANAL0G TO DIGITAL CONVERTER, ADC), a computer 3, and a test program 4. The driving device 1 is connected to the adjustable resistance element 81 of the brightness control circuit 8 for driving the adjustable resistance element 81 to change its resistance value. For example, the driving device 1 can use a stepping motor and a reduction gear set to connect the rotation of the adjustable resistance element 81 so that the stepping motor can drive the rotary knob on the adjustable resistance element 81 to rotate. Preferably, the speed of the stepping motor is (4) the rotational speed of the (four) rotation speed, which is the same or close to the normal rotation of the switch by the hand.
該A/D轉換器2係連接該亮度控制電路8的輸出端 80並X取樣速度，對該亮度控制電路8之輸出電壓 進行取樣’及將每次的取樣到的電練轉換成相對應的數 位信號後料給該電腦3。這魏位信歧每:欠取樣到的 電壓值的里化結果，所以，每—組數位錢實質上代表一 種電廢值。 琢电細d可選用一般的個人電腦，該電腦3透過其i 接界面，例如LPT連接界面，與該驅動裝置i及A/ 器2分別連接。 該^試程式4係絲在該電腦3上，且被配置成心 過該電腦3實現如第二圖所示的步驟： a) 接收該A/D轉換器2傳來的數位信號； b) 根據該些數健制斷該紐控制電路8之輸出$ 壓vout的變動幅度Δν是否符合標準；及 c) 根據判斷結果產生相對應的提示訊息。例如使制 腦3的顯不器顯示代表合格或不合格的文字訊息，㈣ 該電腦3發域表合格或不合格的聲音訊息，或是前述目 200928398 者兼有之。 在日本中央電力研究所（Central Research Instiute of Electric Power Industry, CRIEPI)所發表的研究報告 中指出，人類眼睛對光束照明的變化頻率有不同的敏感 度。人類眼睛對頻率1〜30Hz之間的光會有感覺，尤其對頻 • 率為10Hz的光更能輕易察覺，對頻率高過30Hz或低於 0· 1Hz的光則感覺不出來。因此，該A/D轉換器2對該亮 度控制電路8之輸出電壓Vout的取樣速度最好不小於每秒 〇 30次，較佳是每秒取樣40次。事實上，該A/D轉換器2 的取樣次數愈多，反應出來的輸出電壓Vout也就愈精確， 但次數太多會影響運算速度’所以，應視實際運用場合來 決定。在此例子中是每秒至少要取樣90次，較佳是每秒取 樣120次。這表示該A/D轉換器2每秒會傳送12〇組數位 信號給該電腦3，每一組數位信號分別對應代表該輸出電 壓Vout的一個電壓值。 在該b步驟中，為了較正確地判斷出該輸出電壓v〇ut Q 的變動幅度Δν是否符合標準，較佳是將該A/D轉換器2 傳送給該電腦3的數位信號，以連續3組數位信號所代表 的電壓值VI、V2、V3為一個單位地進行分析比對，只要 VI與V2的差值或V2與V3的差值其中一者大於一標準值， 例如0· IV，就判定該輸出電壓Vout的變動幅度av不符標 準’接著’如c步驟地使該電腦3的顯示器上顯示代表不 合格的提示訊息’這意味著該亮度控制電路8是不良品。 第三、四圖的曲線圖是用來說明該驅動裝置1驅動該 受度控制電路8的該可調電阻元件81改變其電阻值的過程 11 200928398 亮度控制電路8的輪出電壓㈣的對應變動。其中， 果個合格的亮度控制電路8的檢測結 的檢測結果。、、線則顯示一個不合格的亮度控制電路8 而漸ί二=電壓vout的電壓值是隨著時間τ ❹ Ο 朝:跨:ΤΓ元件_ 值是隨著時間T㈣漸減之後，#該輸出電壓VQUt的電壓 1是逆向地峨可調電 ==:r::r 輪議= 該可調電岐件⑽㈣平直㈣部，這是 在第二圖曲線中，县山&陆 並沒化’ 度控制電路8是合袼料補出目前被檢測的亮 相對於第三圖，第 較大的陡㈣化，中;^線明顯是有出現較多及 一變動幅度已大到超出預定二:處這:=巧 檢測的亮度控制電路8是不合格的不良品。 刚破 從^述的說明中可知，本發明系統在檢測該亮度控制 電路8是否會導致該液晶顯示器發生晝面閃爍現象的過程 中，是由該電腦3執行自動檢測，不需要實際連接該背光 電源轉換電路90,也不需要該液晶顯示器，更不需要人 去觀看該液晶顯示II的畫面。因此，相#節省人力且有效 12 200928398 率。 再者，檢測的標準已事先建立在該電腦3中，所有的 檢測結果都是根據同一標準而來的，沒有因人而異的情 形，所以檢測結果的準確度相對較高。 另外，該測試程式4係進步被配置成能接收及更改一 ' 些參數值，並根據該些參數值促使該電腦3控制該驅動裝 置1及該A/D轉換器2的運作。例如步進馬達的轉速、轉 動圈數、及該A/D轉換器2的取樣速度.....等等。 〇 無論如何，任何人都可以從上述例子的說明中獲得足 夠教導，並據而了解到本發明確實具有產業上之利用性及 進步性，且本發明在同一領域中均未見有相同或類似技術 揭露在先而具足有新穎性，是本發明確已符合發明專利要 件，妥依法提出申請。The A/D converter 2 is connected to the output terminal 80 of the brightness control circuit 8 and X sampling speed, samples the output voltage of the brightness control circuit 8 and converts each sampled electric train into a corresponding one. The digital signal is then sent to the computer 3. This Wei-bit-sense is the result of the internalization of the voltage value that is not sampled. Therefore, the amount of money per group represents essentially an electrical waste value. A simple personal computer can be used, and the computer 3 is connected to the driving device i and the A/device 2 through its i interface, for example, the LPT connection interface. The test program 4 is wired on the computer 3 and configured to pass through the computer 3 to implement the steps as shown in the second figure: a) receiving the digital signal transmitted from the A/D converter 2; b) According to the number, the fluctuation amplitude Δν of the output voltage vout of the button control circuit 8 is determined to meet the standard; and c) a corresponding prompt message is generated according to the judgment result. For example, the display device of the brain 3 displays a text message representing a pass or fail, and (4) a voice message that the computer has passed or failed the field, or the above-mentioned item 200928398. According to a research report published by the Central Research Instiute of Electric Power Industry (CRIEPI), human eyes have different sensitivities to the frequency of change in beam illumination. The human eye will have a feeling of light between 1 and 30 Hz, especially for light with a frequency of 10 Hz, and it will not be able to detect light with a frequency higher than 30 Hz or lower than 0.1 Hz. Therefore, the sampling speed of the output voltage Vout of the brightness control circuit 8 by the A/D converter 2 is preferably not less than 30 times per second, preferably 40 times per second. In fact, the more the number of samples of the A/D converter 2 is, the more accurate the output voltage Vout is, but the number of times will affect the calculation speed. Therefore, it should be determined according to the actual application. In this example, at least 90 samples per second are taken, preferably 120 samples per second. This means that the A/D converter 2 transmits a 12-bit digital signal to the computer 3 every second, and each set of digital signals corresponds to a voltage value representing the output voltage Vout. In the step b, in order to correctly determine whether the fluctuation amplitude Δν of the output voltage v〇ut Q conforms to the standard, it is preferable to transmit the A/D converter 2 to the digital signal of the computer 3 for 3 consecutive times. The voltage values VI, V2, and V3 represented by the group digital signals are analyzed in units of one unit, as long as the difference between VI and V2 or the difference between V2 and V3 is greater than a standard value, such as 0·IV, It is determined that the fluctuation range av of the output voltage Vout does not conform to the standard 'next', and a cue message indicating that the failure is indicated is displayed on the display of the computer 3 as in the step c. This means that the brightness control circuit 8 is defective. The graphs of the third and fourth figures are used to illustrate the process in which the driving device 1 drives the adjustable resistance element 81 of the degree control circuit 8 to change its resistance value. 200928398 The corresponding variation of the wheel-out voltage (4) of the brightness control circuit 8 . Among them, the detection result of the detection junction of the qualified brightness control circuit 8. , the line shows an unqualified brightness control circuit 8 and the voltage value of the voltage vout is τ ❹ : toward: 跨: ΤΓ component _ value is decreasing with time T (four), # the output voltage VQUt's voltage 1 is reversed and 峨 adjustable electric ==:r::r 轮== The adjustable electric piece (10) (four) is straight (four), which is in the second figure curve, the county mountain & The degree control circuit 8 is the combination of the currently detected bright light relative to the third figure, the larger steep (four), medium; ^ line obviously has more occurrences and a variation has been larger than the predetermined two: Here, the brightness control circuit 8 of the Q-detection is an unqualified defective product. As is clear from the description of the description, the system of the present invention performs automatic detection by the computer 3 in detecting whether the brightness control circuit 8 causes the flickering phenomenon of the liquid crystal display, and does not need to actually connect the backlight. The power conversion circuit 90 does not need the liquid crystal display, and does not require a person to view the picture of the liquid crystal display II. Therefore, phase # saves manpower and is effective 12 200928398 rate. Furthermore, the standard of detection has been established in the computer 3 in advance, and all the detection results are based on the same standard, and there is no individual-specific situation, so the accuracy of the detection result is relatively high. In addition, the test program 4 is configured to receive and change a parameter value, and based on the parameter values, cause the computer 3 to control the operation of the driving device 1 and the A/D converter 2. For example, the rotational speed of the stepping motor, the number of revolutions, and the sampling speed of the A/D converter 2, etc. In any case, anyone can obtain sufficient teaching from the description of the above examples, and it is understood that the present invention is indeed industrially usable and progressive, and the present invention does not have the same or similar in the same field. The technology disclosure is first and full of novelty, and the invention has indeed met the requirements of the invention patent, and the application is made according to law.
13 200928398 【圖式簡單說明】 第一圖顯示本發明系統較佳例子的方塊圖。 第二圖顯示本發明系統之測試程式的流程圖。 . 第三、四圖的曲線分別顯示本發明系統的兩種檢測結 • 果。 2A/D轉換器 4測試程式 80輸出端 90背光電源轉換電路 【主要元件符號說明】 1驅動裝置 3電腦 8亮度控制電路 81可調電阻元件13 200928398 [Simple Description of the Drawings] The first figure shows a block diagram of a preferred example of the system of the present invention. The second figure shows a flow chart of the test program of the system of the present invention. The curves of Figures 3 and 4 show the two detection results of the system of the present invention, respectively. 2A/D converter 4 test program 80 output terminal 90 backlight power conversion circuit [Main component symbol description] 1 drive device 3 computer 8 brightness control circuit 81 adjustable resistance component