200920121 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種顯示器之輸入訊號源的自動彳貞測I 置及其方法，尤指一種藉由判斷運算放大器輸出電壓變化以 自動偵測輸入訊號源的顯示器之輸入訊號源的自動彳貞測I 置及其方法。 【先前技術】 | Λ 就使用原理來區分顯示器之種類而言，傳統常見的為 10 陰極射線管（Cathode Ray Tube)顯示器’陰極射線管顯示 态的輸入§K號源有Video與S-Video,切換的方式採遙控器選 擇選單或是遙控器快速鍵。 & 然而，隨著科技的進步，液晶電視的使用已愈來愈普 遍，而液晶電視可接收的輸入訊號源也比以往增多，例= 15逐漸普及的高解析度多媒體介面（Hlgh-deflnitl〇n Multimedia Interface，HDMI)訊號源，所謂的 hdmi是針對 〇 下-世代多媒體影音設備所開的傳輸端子，適用於數位家 電的數位電視、DVD放影機、DVD錄放影機、pvR、視訊 轉換器（Set_top Box)以及其他數位視聽商品。最大特色是整 20合訊號的影像和聲音一同傳輸，與傳統影音分離傳輸不 同；採用非壓縮式的數位資料傳輸，可有效降低數位與類 比轉換中所造成的信號干擾與衰減，最大傳輸速度可達 s’除影像資料外’更可同時傳輸高達晴道的音訊作 號，是次世代數位產品中必備的多媒體端子。 ° 200920121 其他種類的輸入訊號源還包括複合訊號（Video)、分 離訊號（s-Vlde。）、電腦訊號（vga)、色差訊號（Ypbpr)等 等’但疋切換的方式依然採遙控器選擇選單或是遙控器快 速鍵’使用者需用遙控器進行切換，才可收看到該輸入訊 5號源，此舉對於使用者而言極為不便。 【發明内容】 基於上述在切換頻道上所造成使用的不便，本發明之 主要目的係在提供一種顯示器之輸入訊號源的自動偵測裝 置’當自動彳貞測裝置偵測到新增的輸入訊號時，即自動切 1〇換至新增的輸入訊號源，因此，當用於觀看電視時，可自 動偵測輸入sfL號源而不需使用者自行切換即可觀賞收視。 本發明之另一目的在提供一種顯示器之輸入訊號源的 自動偵測方法’俾能自動偵測顯示器是否接收到新增的輸 入几就’並於接收到新增的輸入訊號時，自動切換至新增 15 的輪入訊號源。 為達成上述目的，本發明之顯示器之輸入訊號源的自 動偵測裝置，主要包含至少一電壓源、微控制器、至少一 輸入訊號源、分壓電路以及至少一運算放大器。其中各運 算放大器之第一輸入端連接至少一輸入訊號源，各運算放 大器之輸出端分別具有一輸入訊號源债測端子，各輸入 5孔5虎源偵測端子分別連接至微控制器之至少一偵測接腳， 分壓電路之—端連接至電壓源，另一端連接至地電位，分 壓電路用以提供參考電壓及輸入電壓分別至各運算放大器 之第二輸入端及第一輸入端，微控制器根據各輸入訊號源 200920121 偵測端子電壓準位高低之狀態，自動偵測與切換顯示器之 輸入訊號源。 本發明為一種顯示器之輸入訊號源的自動侦測方法， 係將至少一輸入訊號源連接至少—運算放大器之一輸入 端，各運算放大器之輸出端分別具有一輸入訊號源偵測端 子，各輸入訊號源偵測端子分別連接至一微控制器，本方 法包含以下步驟： (A) 提供一輸入訊號源； (B) 偵測各輸入訊號源偵測端子之電壓準位；以及 10 (C)依據各輸入訊號源偵測端子之電壓準位狀態，判 斷是否接收-新增輸入訊號源’若是，則切換至新增輸入 訊號源並返回步驟（B)。 依照本發明的較佳實施例所述之方法，其中，於步驟（c) 中，當未接收新增輸入訊號源時，進行一步驟（D):偵測目 15 前是否存在輸入訊號源，若否，則進行一省電動作，若是， 則返回步驟（B)。 ❹ 【實施方式】 清參見圖1，圖1係本發明一較佳實施例之液晶電視與 訊號源自動偵測架構圖。液晶電視具有多個輸入訊號源: 20電視訊號源1〇1 (TV_Signal)、複合訊號源l〇3(Video)、分離 訊號源105(S-Video)、色差訊號源i〇7(YPbPr)，以上訊號源 为別連接到視訊解碼器109與音訊解碼器丨丨！。電腦訊號源 113(VGA)與南解析度多媒體介面（HDMI)訊號源n5連接到 類比數位轉換器/HDMI介面117。音訊解碼器111將解譯的 200920121 音訊透過音訊擴大器119(Audio AMP)放大，最後由喇叭播 出，解譯的視訊則由視訊縮放器121(Scaler)調整至適當比例 由面板123(Panel)播出。微控制器125(mCU)連接紅外線接 收器127(IR Pad)、按鍵組丨29(Key Pad)與可編程唯讀記憶體 5 131(E2PROM) ’紅外線接收器127接收遙控器訊號，微控制 器125針對接收到的訊號進行動作，按鍵組129提供開關 機、凋整頻道與音量等基本功能，可編程唯讀記憶體13】負 貝儲存負料。電源模組133(P〇wer Model)供電給晶片（5V) 〇 與面板（24v) ’微控制器125可控制電壓轉換器nsQnverter) 10 改變面板亮度。 本發明是將各訊號源連接至訊號偵測裝置丨37(Signal Detector)，訊號偵測裝置！37偵測到新訊號輸入時，將偵測 結果傳送至微控制器125，微控制器125會自動切換至新訊 號源，使用者不需要自行進行額外的切換動作即可觀賞收 15 視。大幅增加使用上的便利性。 圖2A係本發明一較佳實施例之顯示器輸入訊號源之自 Q 動偵測裝置電路圖，顯示器輸入訊號源之自動偵測裝置包 含：電壓源VCC1及VCC2、輸入訊號源S1〜S4、電阻R1〜R6、 濾波電容ci與電容.C2、運算放大器m〜U4及分壓電路 2〇 2 〇卜運算放大器U1〜u4之輸出端分別具有一輸入訊號源偵 測端子D1〜D4,輸入訊號源偵測端子D1〜D4分別連接至微 控制器125之各偵測接腳。其中，輸入訊號源S1〜S4涵蓋許 夕種類，例如高解析度多媒體介面（HDMI)、複合訊號源 (Video)、分離訊號源（s_Vide〇)、色差訊號源（Ypbpr)、電腦 200920121 訊號源（VGA) 、DVI介面訊號等，電阻R1與電阻R2以節點 N1而電阻R2與電阻R3以節點N2相互串接成一分壓電路 201，分壓電路201—端連接至電壓源VCC1，另一端連接至 地電位。 5 各運算放大器U1〜U4之反相輸入端分別連接輸入訊號 源S1〜S4，運算放大器U1〜U4之正電源端連接至電壓源 VCC1，運算放大器U1〜U4之負電源端連接至地電位。 本實施例中顯示器輸入訊號源之自動偵測裝置還包含 濾波電容C1與電容C2，各濾波電容C1之一端分別連接至輸 10 入訊號源S1〜S4，另一端分別連接至運算放大器U1〜U4之 反相輸入端。各電容C2之一端分別連接運算放大器U1〜U4 之輸出端，另一端分別連接至地電位。 本實施例中顯示器輸入訊號源之自動偵測裝置還包含 電阻R4、電阻R5及電阻R6，電阻R4之一端連接各分壓電路 15 201之節點N2，另一端連接各運算放大器U1〜U4之反相輸 入端。電阻R5—端連接運算放大器U1〜U4之輸出端，另一 端連接一電壓源VCC2。電阻R6—端連接運算放大器U1〜U4 之輸出端，另一端連接輸入訊號源偵測端子D1〜D4。 分壓電路201包含電阻R1、電阻R2及電阻R3，電阻R1 20 與電阻R2間以節點N1相互串接，電阻R2與電阻R3間以節點 N2相互串接，節點N1具有參考電壓VR，節點N2具有輸入電 壓Vin，參考電壓VR之電壓準位大於輸入電壓Vin之電壓準 位，分壓電路201將參考電壓VR及輸入.電壓Vin分別提供至 運算放大器U1〜U4之正相輸入端及反相輸入端。 200920121 ' 舉例來說，當未接收到輸入訊號源S2時，運算放大器 U2之正相輸入端電位將高於反相輸入端電位，當接收到輸 入訊號源S2時，運算放大器U2之反相輸入端電位將高於正 相輸入端電位，因此運算放大器U2之輸出端電壓準位便會 5由高電壓準位改變至低電壓準位，微控制器125根據輸入訊 號源偵測端子D2電壓準位高低之改變，自動偵測出接收到 輸入訊號源S2。顯示器例如為液晶顯示器、陰極射線管顯 示益’微控制器之偵測接腳例如為通用輸入輸出接腳。 C 為進一步說明，請參見圖2B，圖2B係本發明一較佳實 10施例之顯示器輸入訊號源之自動偵測裝置局部電路圖，包 含電壓源VCC1與電壓源VCC2、輸入訊號源S1、電阻 R1〜R3、運算放大器m、分壓電路2〇1與微控制器2〇3。運 算放大器U1之輸出端具有一輸入訊號源偵測端子〇1，輸入 訊號源偵測端子D1連接至微控制器203之偵測接腳，分壓電 15路201 一端連接至電壓源VCC1 (本實施例中為5伏特），另 一端連接至地電位。 Q 分壓電路201包含電阻R1 ( 470歐姆）、電阻R2 ( 1〇歐 姆）及電阻R3 ( 470歐姆），電阻R1與電阻R2間以節點⑴ 相互串接，電阻R2與電阻们間以節點互串接，節點則 20具有參考電壓vR(2.5伏特），節點N2具有輸入電壓vin(2.43 伏特），參考電壓vR之電壓準位大於輸入電壓Vin之電壓準 位70毫伏特，分壓電路2〇1將參考電壓VR及輸入電壓Vin分 別提供至運算放大器m之正相輸入端及反相輸入端，當顯 不器未接收輸入訊號源S1時，運算放大器川之正相輸入端 10 200920121 輸入電壓大於反相輸入端輸入電壓，因此運算放大器川輸 出為HIGH，輸入訊號源偵測端子D1之電壓值與電壓源 VCC2相等（3.3伏特），當顯示器接收到輸入訊號源S1時， 輸入訊號源S1將會拉升運算放大器m之反相輸入端輸入電 5 壓，造成運异放大器U1之正相輸入端輸入電壓小於反相輸 入端輸入電壓，此時運算放大器輸出為L〇w，輸入訊號 源偵測端子D1之電壓值由3_3伏特降為〇伏特，因此，微控 制器203根據輸入訊號源偵測端子D1之電壓準位由高電壓 準位改變至低電壓準位之變化，偵測出輸入訊號源s丨之輸 10 入。 圖3係本發明一較佳實施例之顯示器輸入訊號源之自 動偵測裝置之微控制器電路圖，輸入訊號源偵測端子D i〜 D6分別連接微控制器之部分偵測接腳（例如通用輸入輸出 接腳），微控制器根據輪入訊號源偵測端子D1〜D6電壓準 15 位南低之狀態’自動偵測顯示器之輸入訊號源。當有訊號 輸入時，其訊號輸入源所連接之運算放大器之輸出為低電 位電壓’此時連接微控制器的類比數位轉換腳位（ADC)將觸 發微控制器外部中斷，此中斷處理程序將判斷出訊號之輸 入並進行訊號源切換動作。 20 圖4係本發明一較佳實施例之顯示器輸入訊號源自動 痛測方法流程圖，包含以下步雜：提供輸入訊號源（步驟 S401);偵測輸入訊號源偵測端子之電壓準位（步驟S4〇3); 以及依據各輸入訊號源偵測端子之電壓準位狀態，判斷是 200920121 否接收一新增輸入訊號源（步驟S405) ’若是，則切換至新@ 輸入訊號源（步驟S407)並返回步驟S403。 若於步驟S405中’未偵測出有新增之輸入訊號源時， 即偵測目前是否存在輸入訊號源（步驟S409)，若否，則進 5 行一省電動作（步驟S411)，若是，則返回步驟S4〇3，繼續 對偵測輸入訊號源。 其中’各輸入訊號源包含複合訊號源、分離訊號源、 色差訊號源以及電腦訊號源，或是高解析度多媒體介面 Γ) (HDMI)訊號源。顯示器為液晶顯示器或陰極射線管顯示 10 器。 上述貫把例僅係為了方便说明而舉例而已，本發明所 主張之權利範圍自應以申請專利範圍所述為準，而非僅限 於上述實施例。 15 【圖式簡單說明】 圖1係本發明一較佳實施例之液晶電視與訊號源自動偵測 架構圖。 圖2A係本發明一較佳實施例之顯示器輸入訊號源之自動偵 測裝置電路圖。 ' 20圖2B係本發明-較佳實施例之顯示器輸入訊號源之自動偵 測裝置局部電路圖。 圖3係本發明-較佳實施例之顯示器輸入訊號源之自動偵 測t置中微控制器電路圖。 12 200920121 圖4係本發明_ 方法流程圖。 〜較佳實施例之顯示器輸 入訊號源自動偵測 【主要元件符 號說明】 電視訊號101 色差訊號107 電腦訊號113 複合訊號103 視訊解碼器1〇9 高清晰度多媒體 分離訊號105 音訊解碼器111 類比數位轉換器 音訊擴大器119 界面訊號115 /HDMI介面 117 視訊縮放器121 面板123 微控制器125 紅外線接收器127 可編程唯讀記憶體131 電源模組13 3 電壓轉換器135 電壓源VCC1 電壓源VCC2 輸入訊號源S1~S4 電阻R1~R6 濾波電容C1 電容C2 運算放大器U1〜U4 分壓電路201 微控制器203 輸入訊號源偵測端子 D1 〜D6 步驟S401〜S411 Ο 10 13200920121 IX. Description of the Invention: [Technical Field] The present invention relates to an automatic measurement I of a display signal source of a display and a method thereof, and more particularly to automatically detecting an input by determining an output voltage change of an operational amplifier The automatic measurement I of the input signal source of the display of the signal source and its method. [Prior Art] | Λ In terms of the principle of using the device to distinguish the type of display, the conventional common is a cathode ray tube (Cathode Ray Tube) display. The cathode ray tube display state input § K source has Video and S-Video, The way to switch is to use the remote control to select the menu or the remote control shortcut. & However, with the advancement of technology, the use of LCD TVs has become more and more common, and the input signal source that LCD TVs can receive has increased more than before. For example, the high-resolution multimedia interface that is gradually popularized (Hlgh-deflnitl〇) n Multimedia Interface (HDMI) signal source, the so-called hdmi is a transmission terminal for the next-generation multimedia audio and video equipment, digital TV, DVD player, DVD recorder, pvR, video converter for digital home appliances (Set_top Box) and other digital audiovisual products. The biggest feature is that the image and sound of the whole 20-sound signal are transmitted together, which is different from the traditional video-audio separation transmission; the uncompressed digital data transmission can effectively reduce the signal interference and attenuation caused by digital and analog conversion, and the maximum transmission speed can be In addition to the image data, the s' can transmit the audio signal of the Qingdao Road at the same time, which is a necessary multimedia terminal in the next generation digital products. ° 200920121 Other types of input signal sources include composite signal (Video), separate signal (s-Vlde.), computer signal (vga), color difference signal (Ypbpr), etc. 'But the way to switch is still to choose the remote control menu. Or the remote control quick key 'user needs to use the remote control to switch, only to receive the input source No. 5, which is extremely inconvenient for the user. SUMMARY OF THE INVENTION Based on the above-mentioned inconvenience caused by switching channels, the main object of the present invention is to provide an automatic detecting device for inputting a signal source of a display, when the automatic detecting device detects a newly added input signal. At that time, the switch automatically switches to the newly added input signal source. Therefore, when used to watch TV, the input sfL source can be automatically detected without the user switching to watch the viewing. Another object of the present invention is to provide an automatic detection method for an input signal source of a display, which can automatically detect whether a display receives a new input number, and automatically switch to when a new input signal is received. Added 15 round-robin source. To achieve the above objective, the automatic detection device for the input signal source of the display of the present invention mainly comprises at least one voltage source, a microcontroller, at least one input signal source, a voltage dividing circuit and at least one operational amplifier. The first input end of each operational amplifier is connected to at least one input signal source, and the output ends of each operational amplifier respectively have an input signal source test terminal, and each input 5 hole 5 tiger source detection terminal is respectively connected to the microcontroller. a detecting pin, the voltage dividing circuit is connected to the voltage source, and the other end is connected to the ground potential, and the voltage dividing circuit is configured to provide a reference voltage and an input voltage to the second input end of each operational amplifier and the first At the input end, the microcontroller automatically detects and switches the input signal source of the display according to the state of detecting the terminal voltage level of each input signal source 200920121. The invention relates to an automatic detection method for an input signal source of a display, which connects at least one input signal source to at least one input terminal of an operational amplifier, and an output terminal of each operational amplifier has an input signal source detection terminal, each input The signal source detection terminals are respectively connected to a microcontroller. The method comprises the following steps: (A) providing an input signal source; (B) detecting a voltage level of each input signal source detection terminal; and 10 (C) According to the voltage level status of each input signal source detecting terminal, it is determined whether to receive - add input signal source 'if yes, switch to the newly added input signal source and return to step (B). According to the method of the preferred embodiment of the present invention, in step (c), when the new input signal source is not received, a step (D) is performed: whether the input signal source exists before the target 15 is detected. If not, a power saving operation is performed, and if yes, return to step (B).实施 [Embodiment] Referring to FIG. 1, FIG. 1 is a diagram showing an automatic detection architecture of a liquid crystal television and a signal source according to a preferred embodiment of the present invention. The LCD TV has multiple input signal sources: 20 TV signal source 1〇1 (TV_Signal), composite signal source l〇3 (Video), separate signal source 105 (S-Video), color difference signal source i〇7 (YPbPr), The above signal source is connected to the video decoder 109 and the audio decoder! . The computer signal source 113 (VGA) and the South Resolution Multimedia Interface (HDMI) signal source n5 are connected to the analog digital converter/HDMI interface 117. The audio decoder 111 amplifies the interpreted 200920121 audio through the audio amplifier 119 (Audio AMP), and finally broadcasts it by the horn, and the interpreted video is adjusted by the video scaler 121 (Scaler) to an appropriate scale by the panel 123 (Panel). Broadcast. Microcontroller 125 (mCU) is connected to infrared receiver 127 (IR Pad), button group 丨 29 (Key Pad) and programmable read only memory 5 131 (E2PROM) 'infrared receiver 127 receives remote control signal, microcontroller 125 operates on the received signal, and the button group 129 provides basic functions such as switching on and off, channel and volume, and programmable read-only memory 13] negative storage. Power module 133 (P〇wer Model) supplies power to the chip (5V) 〇 and panel (24v) 'Microcontroller 125 can control voltage converter nsQnverter) 10 Change the panel brightness. The invention connects each signal source to the signal detection device 丨37 (Signal Detector), the signal detection device! When the new signal input is detected, the detection result is transmitted to the microcontroller 125, and the microcontroller 125 automatically switches to the new signal source, and the user does not need to perform additional switching actions to view the video. Significantly increase the convenience of use. 2A is a circuit diagram of a self-detecting device for inputting a signal source of a display according to a preferred embodiment of the present invention. The automatic detecting device for inputting a signal source includes: voltage sources VCC1 and VCC2, input signal sources S1 to S4, and resistor R1. ~R6, filter capacitor ci and capacitor. C2, operational amplifier m~U4 and voltage dividing circuit 2〇2 输出Bu operational amplifiers U1~u4 have an input signal source detection terminal D1~D4, input signal source respectively The detection terminals D1 D D4 are respectively connected to the detection pins of the microcontroller 125. Among them, the input signal source S1~S4 covers the Xuxi type, such as high-resolution multimedia interface (HDMI), composite signal source (Video), separated signal source (s_Vide〇), color difference signal source (Ypbpr), computer 200920121 signal source ( VGA), DVI interface signal, etc., resistor R1 and resistor R2 are connected by node N1 and resistor R2 and resistor R3 are connected to each other by node N2 to form a voltage dividing circuit 201. The voltage dividing circuit 201 is connected to the voltage source VCC1, and the other end is connected. Connect to ground potential. 5 The inverting input terminals of the operational amplifiers U1 to U4 are respectively connected to the input signal sources S1 to S4, the positive power terminals of the operational amplifiers U1 to U4 are connected to the voltage source VCC1, and the negative power terminals of the operational amplifiers U1 to U4 are connected to the ground potential. In this embodiment, the automatic detection device for the input signal source of the display further includes a filter capacitor C1 and a capacitor C2. One end of each filter capacitor C1 is respectively connected to the input signal source S1 to S4, and the other end is connected to the operational amplifiers U1 to U4, respectively. Inverting input. One end of each capacitor C2 is connected to the output terminals of the operational amplifiers U1 to U4, respectively, and the other end is connected to the ground potential. In this embodiment, the automatic detection device for inputting the signal source of the display further comprises a resistor R4, a resistor R5 and a resistor R6. One end of the resistor R4 is connected to the node N2 of each voltage dividing circuit 15 201, and the other end is connected to each of the operational amplifiers U1 to U4. Inverting input. The resistor R5 is connected to the output terminals of the operational amplifiers U1 to U4, and the other end is connected to a voltage source VCC2. The resistor R6 is connected to the output terminals of the operational amplifiers U1 to U4, and the other end is connected to the input signal source detecting terminals D1 to D4. The voltage dividing circuit 201 includes a resistor R1, a resistor R2 and a resistor R3. The resistor R1 20 and the resistor R2 are connected in series with each other by a node N1. The resistor R2 and the resistor R3 are connected in series with each other by a node N2. The node N1 has a reference voltage VR and a node. N2 has an input voltage Vin, the voltage level of the reference voltage VR is greater than the voltage level of the input voltage Vin, and the voltage dividing circuit 201 supplies the reference voltage VR and the input voltage Vin to the positive phase input terminals of the operational amplifiers U1 to U4, respectively. Inverting input. 200920121 ' For example, when the input signal source S2 is not received, the potential of the non-inverting input terminal of the operational amplifier U2 will be higher than the potential of the inverting input terminal, and the inverting input of the operational amplifier U2 when receiving the input signal source S2 The terminal potential will be higher than the potential of the positive phase input terminal, so the voltage level of the output terminal of the operational amplifier U2 will be changed from the high voltage level to the low voltage level, and the microcontroller 125 detects the voltage of the terminal D2 according to the input signal source. The change of the bit height automatically detects the input of the input signal source S2. The display is, for example, a liquid crystal display or a cathode ray tube. The detection pin of the microcontroller is, for example, a general-purpose input/output pin. For further explanation, please refer to FIG. 2B. FIG. 2B is a partial circuit diagram of an automatic detection device for a display input signal source according to a preferred embodiment of the present invention, including a voltage source VCC1 and a voltage source VCC2, an input signal source S1, and a resistor. R1 to R3, operational amplifier m, voltage dividing circuit 2〇1 and microcontroller 2〇3. The output terminal of the operational amplifier U1 has an input signal source detecting terminal 〇1, the input signal source detecting terminal D1 is connected to the detecting pin of the microcontroller 203, and the piezoelectric 15 channel 201 end is connected to the voltage source VCC1 (this In the embodiment 5 volts), the other end is connected to ground potential. The Q voltage dividing circuit 201 includes a resistor R1 (470 ohms), a resistor R2 (1 ohm), and a resistor R3 (470 ohms). The resistor R1 and the resistor R2 are connected in series with each other (1), and the resistor R2 and the resistor are connected to each other. In series, the node 20 has a reference voltage vR (2.5 volts), the node N2 has an input voltage vin (2.43 volts), the voltage level of the reference voltage vR is greater than the voltage level of the input voltage Vin by 70 millivolts, and the voltage dividing circuit 2〇1 provides the reference voltage VR and the input voltage Vin to the positive phase input terminal and the inverting input terminal of the operational amplifier m respectively. When the display device does not receive the input signal source S1, the operational amplifier of the positive phase input terminal 10 200920121 The input voltage is greater than the input voltage of the inverting input terminal, so the operational amplifier output is HIGH, and the voltage value of the input signal source detecting terminal D1 is equal to the voltage source VCC2 (3.3 volts). When the display receives the input signal source S1, the input signal is input. The source S1 will pull up the input 5 voltage of the inverting input of the operational amplifier m, causing the input voltage of the non-inverting input terminal of the operational amplifier U1 to be smaller than the input voltage of the inverting input terminal. The voltage value of the input signal source detecting terminal D1 is reduced from 3_3 volts to 〇V. Therefore, the microcontroller 203 changes the voltage level of the input signal source detecting terminal D1 from the high voltage level to the low level. The change of the voltage level detects the input of the input signal source 丨. 3 is a circuit diagram of a microcontroller of an automatic detection device for inputting a signal source of a display according to a preferred embodiment of the present invention. The input signal source detecting terminals D i D D6 are respectively connected to a part of the detecting pin of the microcontroller (for example, general purpose The input/output pin), the microcontroller automatically detects the input signal source of the display according to the state of the wheel source signal detecting terminals D1 to D6 and the voltage of 15 bits south and low. When there is a signal input, the output of the operational amplifier connected to the signal input source is a low potential voltage. At this time, the analog digital conversion pin (ADC) connected to the microcontroller will trigger the external interrupt of the microcontroller. This interrupt handler will Determine the input of the signal and perform the signal source switching action. 20 is a flow chart of an automatic pain test method for a display input signal source according to a preferred embodiment of the present invention, which includes the following steps: providing an input signal source (step S401); detecting a voltage level of the input signal source detection terminal ( Step S4〇3); and according to the voltage level state of each input signal source detecting terminal, it is determined whether 200920121 receives a new input signal source (step S405). If yes, then switches to the new@input signal source (step S407). And returns to step S403. If the new input signal source is not detected in step S405, it detects whether there is an input signal source (step S409), and if not, enters a power saving operation (step S411), if Then, return to step S4〇3 to continue detecting the input signal source. Among them, the input sources include a composite signal source, a separate signal source, a color difference signal source, and a computer signal source, or a high-resolution multimedia interface (HDMI) signal source. The display is a liquid crystal display or a cathode ray tube display. The above description is only for the sake of convenience of description, and the scope of the claims should be construed as the scope of the claims, and not limited to the above embodiments. 15 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an automatic detection architecture of a liquid crystal television and a signal source according to a preferred embodiment of the present invention. 2A is a circuit diagram of an automatic detecting device for inputting a signal source of a display according to a preferred embodiment of the present invention. 20B is a partial circuit diagram of an automatic detecting device for a display input signal source of the present invention - a preferred embodiment. 3 is a circuit diagram of an automatic detection t-centered microcontroller of the input signal source of the display of the preferred embodiment of the present invention. 12 200920121 Figure 4 is a flow chart of the method of the present invention. ~Automatic detection of display input signal source of preferred embodiment [Key component symbol description] TV signal 101 Color difference signal 107 Computer signal 113 Composite signal 103 Video decoder 1〇9 High definition multimedia separation signal 105 Audio decoder 111 Analog digital Converter Audio Amplifier 119 Interface Signal 115 / HDMI Interface 117 Video Scaler 121 Panel 123 Microcontroller 125 Infrared Receiver 127 Programmable Read Only Memory 131 Power Module 13 3 Voltage Converter 135 Voltage Source VCC1 Voltage Source VCC2 Input Signal source S1~S4 Resistor R1~R6 Filter capacitor C1 Capacitor C2 Operational amplifier U1~U4 Voltage dividing circuit 201 Microcontroller 203 Input signal source detecting terminal D1~D6 Step S401~S411 Ο 10 13