201248486 六、發明說明： 【發明所屬之技術頌威】 ⑽01] 本發明係有關於一種數位板（Digitizer)，特別是 一種具有鎖相電路的數位板，讓電磁筆可接收对最大能 量。 [先前技術3 [〇0〇2] 目前的電磁式數位板（Digitizer )技術中，主要以 被動式電磁式觸控技術為主。第一A圖係顯示傳統之被動 ^ 式電磁式數位板10的示意圖。如第一A圖所示，傳統的數 位板10的應用電路102控制發射電路104傳送一電磁波給 感應天線板106。感應天線板（sensor board) 106會 發射一固定頻率（例如：375Khz)給電磁筆108，此頻 率稱為基頻，而電磁筆108上的振盪電路會設計與基頻相 同的振盪點。當感應電路板106發送出電磁波給電磁筆 108感應時，電磁筆1〇8上的震盪電路產生共振，此時會 收到最強的電磁波能量。 〇 [0003] 電磁筆108上的振盪電路為LC振盪電路，而電磁筆108 為做到下壓時的產生壓力階度，電磁筆108下壓時會改變 L或改變C來改變頻率點。當感應天線板106收到不同於基 頻的頻率時，會進行壓力的處理而產生出壓力的階度。 當電磁筆108下壓後，電磁筆108的共振頻率點會線性 變化，而造成電磁筆108上的LC振盪電路對基頻的共振點 偏移。當感應天線板106還是發射基頻頻率時，電磁筆 1 〇8收到的能量不是最大的，有部分電磁波散失掉，如第 —β圖所示。所以當電磁筆1〇8下壓時，共振產生的能量 100117627 表單編號Α0101 第3頁/共12頁 1002029615-0 201248486 [0005] [0006] [0007] [0008] 100117627 不強，回饋給感應天線板106的能量也就更弱，容易造成 電磁筆108下壓後的不穩定，進而造成觸控辨識的錯誤。 因此，如果感應天線板發送的能量頻率可以追隨電磁筆一 的頻率變化，當電磁筆的震盪頻率偏移時，感應天線板 發出相對偏移的共振頻率點，當電磁筆下壓後，振盪點 無論如何偏移，感應天線板都可以發出相對應的共振頻 率，此時電磁筆都會收到最大能量。 【發明内容】 本發明的目的在於提供一種數位板，此數位板具有一 鎖相電路，利用該鎖相電路控制一電磁波信號的頻率。 本發明的另一目的在提供一種數位板，其可控制數位 板之共振信號產生漂移後，數位板可以調整電磁波信號 以降低誤差。 根據以上所述之目的，本發明揭露一種具鎖相電路的 數位板（Digitizer)，其包含發射電路、應用電路、 天線感應板與接收電路。發射電路用於產生一電磁波信 號。應用電路用於控制發射電路產生電磁波信號。天線 感應板接收電磁波能量，並將電磁波能量發射出，讓一 電磁筆接收。接收電路，用於接收電磁筆所共振出的一 共振信號，並將該共振信號傳輸至該應用電路。其中鎖 相電路用於調整頻率，進而控制發送電路傳送具有新頻 率的電磁波信號。 根據以上所述之目的，本發明又揭露另一種一種具鎖 相電路的數位板（Digitizer)，其包含發射電路、應 用電路、天線感應板與接收電路。發射電路用於產生一 表單編號A0101 第4頁/共12頁 1002029615-0 201248486 電磁波信號。應料路電性連接發射電路，且用於控制 發射電路產生電磁波信號；天線感應板電性連接發射電 路以接收電磁波能量，並將電磁波能量發射讓—電磁筆 接收。接收電路電性連接天線感應板與助電路，並用 於接收電磁筆所共振出的-共振信號，並將共振信號傳 輸至應用電路。其巾應料路比較電磁波信號與共振信 號的頻率，若電磁波信號的頻率不同於共振信號，鎖相 Ο [0009] [0010] Ο 電路調整電磁波信號的頻率，讓發送電路傳送新頻率的 電磁波信號。 【實施方式】 本發明的一些實施例會詳細描述如下。然而，除了詳 細描述外，本發明還可以廣泛地在其他的實施例施行， 且本發明的範圍不受限定，其以之後的專利範圍為準。 第二圖係顯示本發明之具展頻電路數位板的示意圖。 如第二圖所示’在此實施例的數位板20主要包含應用電 路202、發送電路204 ’感應天線板（gensor board) 206、電磁筆208，接收電路210與鎖相（phase Lock Loop, PLL)電路212。發送電路204分別與應用電路 202和感應天線板206電性連接，數位板20的應用電路 202用於對電磁筆之觸控座標與壓力作計算，且控制應用 電路202控制發送電路204對感應天線板206做發送或停 止發送固定頻率的電磁波（又稱基頻信號）。此時，感 應天線板206會將所接收的固定頻率（例如：375KHz) 的電磁波信號發送給電磁筆208，而電磁筆208上的LC共 振電路（未圖示）會產生共振。當電磁筆208下壓時（即 100117627 表單編號A0101 第5頁/共12頁 1002029615-0 201248486 做書寫的動作）會改變L或是改變C來改變頻率點，接收 電路210在接收到不同於基頻頻率的信號時，會將信號傳 送至應用電路202進行壓力處理而產生出壓力階度。而鎖 相電路212分別與應用電路202與發送電路204電性連接 [0011] 然而’依舊參閱第二圖，不同於傳統的數位板，本發 明的應用電路202先控制鎖相電路212設定要發送能量的 頻率，再由應用電路202控制發送電路204對感應天線板 206做發送或停止發送電磁波信號的控制。當發送完電磁 〇 波能量後，應用電路202控制接收電路210對天線做接收 及停止接收電磁筆208反饋回來的能量。接收完後，應用 電路202會去對信號做處理，進而送出座標及壓力值（觸 控辨識）。在做下次信號發射與接收動作之前’本發明 的應用電路202會將接收回來的信號跟上一筆接收回來的 信號做比對，判斷出電磁筆是否下壓。如果電磁筆2〇8的 共振點偏移後’應用電路2〇2會控制鎖相電路212調整頻 率，使得頻率可以追隨電磁筆2〇8上的共振點做調整，讓 〇 發送電路204可以發送不同於之前基頻頻率（如375Khz )的電磁波給電磁筆208，讓電磁筆208可以一直接收到 最強的能量，進而降低辨識的誤差。 [0012] 第二B圖係顯示本發明之數位板的信號示意圖。如第二 B圖所示，舉例來說，當基頻頻率在375KHz時，電磁筆 208的共振頻率也在375KHz。當電磁筆2〇8下壓時，共振 頻率偏移至385KHz，應用電路202控制鎖相電路2〇6將發 送電路204所要發射的基頻頻率轉換成385KHz。所以電 100117627 表單編號A0101 第6頁/共12頁 1002029615-0 201248486 磁筆208不會因為共振頻率的偏移而填成接收之基頻作號 產生誤差，進而導致觸控辨識的錯誤。然而，在此需要 說明的是，上述之頻率值375ΚΗζ與385ΚΗζ僅是解釋電磁 筆208偏移問題，而非限制本發明之數位板2〇的所能發射 Ο [0013] [0014] Ο [0015] 的能量頻率僅限於375ΚΗζ與385ΚΗζ。只要電磁筆2〇8產 生偏移，應用電路202就會將接收回來的信號跟上—筆接 收回來的信號做比對，若產生信號偏移，應用電路2〇2則 根據信號偏移量控制鎖相電路212調整頻率，進而控制發 送電路204傳送新頻率的電磁波能量。 以上所述僅為本發明之較佳實施例而已，並非用以限 定本發明之申請專利範圍；凡其它未脫離本發明所揭示 之精神下所完成之等效改變或修飾，均應包含在下述之 申請專利範圍内。 【圖式簡單說明】 第一 Α圖為傳統之數位板的示意圖； 第一 B圖為傳統之數位板的信號示意圖； 第二A圖為本發明之具展頻電路數位板的示意圖；及 第二B圖為本發明之數位板的信號示意圖。 【主要元件符號說明】 10 數位板 102 應用電路’ 104 發射電路 106 天線感應板 108 電磁筆 110 接收電路 100117627 表單編號A0101 第7頁/共12頁 1002029615-0 201248486 20 202 204 206 208 210 212 數位板. 應用電路 發射電路 天線感應板 電磁筆 接收電路 鎖相電路 100117627 表單編號A0101 第8頁/共12頁 1002029615-0201248486 VI. Description of the Invention: [Technology of the Invention] (10) 01 The present invention relates to a digitizer, and more particularly to a tablet having a phase lock circuit, which allows the electromagnetic pen to receive the maximum energy. [Prior Art 3 [〇0〇2] In the current electromagnetic digitizer (Digitizer) technology, passive electromagnetic touch technology is mainly used. The first A diagram shows a schematic diagram of a conventional passive electromagnetic tablet 10. As shown in the first A diagram, the application circuit 102 of the conventional digital panel 10 controls the transmitting circuit 104 to transmit an electromagnetic wave to the inductive antenna panel 106. The sensor board 106 transmits a fixed frequency (e.g., 375 Khz) to the electromagnetic pen 108. This frequency is referred to as the fundamental frequency, and the oscillation circuit on the electromagnetic pen 108 is designed to have the same oscillation point as the fundamental frequency. When the sensing circuit board 106 sends an electromagnetic wave to the electromagnetic pen 108, the oscillating circuit on the electromagnetic pen 1 产生 8 resonates, and the strongest electromagnetic wave energy is received. 0003 [0003] The oscillating circuit on the electromagnetic pen 108 is an LC oscillating circuit, and the electromagnetic pen 108 generates a pressure grading when it is pressed down. When the electromagnetic pen 108 is pressed down, it changes L or changes C to change the frequency point. When the inductive antenna board 106 receives a frequency different from the fundamental frequency, pressure processing is performed to generate a pressure gradation. When the electromagnetic pen 108 is pressed down, the resonance frequency point of the electromagnetic pen 108 changes linearly, causing the LC oscillation circuit on the electromagnetic pen 108 to shift to the resonance point of the fundamental frequency. When the sensing antenna board 106 is still transmitting the fundamental frequency, the energy received by the electromagnetic pen 1 〇 8 is not the largest, and some of the electromagnetic waves are lost, as shown in the -β figure. Therefore, when the electromagnetic pen 1〇8 is pressed down, the energy generated by the resonance 100117627 Form No. 1010101 Page 3/Total 12 Page 1002029615-0 201248486 [0005] [0006] [0008] 100117627 Not strong, feedback to the sensing antenna The energy of the board 106 is also weaker, which is liable to cause instability of the electromagnetic pen 108 after being pressed, thereby causing errors in touch recognition. Therefore, if the frequency of the energy transmitted by the sensing antenna board can follow the frequency change of the electromagnetic pen, when the oscillation frequency of the electromagnetic pen is offset, the sensing antenna plate emits a relative offset resonance frequency point, and when the electromagnetic pen is pressed, the oscillation point is How to offset, the sensing antenna board can emit the corresponding resonant frequency, and the electromagnetic pen will receive the maximum energy. SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital pad having a phase lock circuit for controlling the frequency of an electromagnetic wave signal using the phase lock circuit. Another object of the present invention is to provide a digital panel that can control the resonance signal of the tablet to drift, and the tablet can adjust the electromagnetic wave signal to reduce the error. According to the above, the present invention discloses a digitizer with a phase lock circuit, which comprises a transmitting circuit, an application circuit, an antenna sensing board and a receiving circuit. The transmitting circuit is used to generate an electromagnetic wave signal. The application circuit is used to control the transmitting circuit to generate an electromagnetic wave signal. The antenna sensor board receives electromagnetic wave energy and emits electromagnetic wave energy for an electromagnetic pen to receive. The receiving circuit is configured to receive a resonance signal resonated by the electromagnetic pen and transmit the resonance signal to the application circuit. The phase-locked circuit is used to adjust the frequency, and then the transmitting circuit is controlled to transmit an electromagnetic wave signal having a new frequency. According to the above, the present invention further discloses a digitizer with a phase-locked circuit, which comprises a transmitting circuit, an application circuit, an antenna sensing board and a receiving circuit. The transmitting circuit is used to generate a form number A0101 Page 4 of 12 1002029615-0 201248486 Electromagnetic wave signal. The circuit should be electrically connected to the transmitting circuit, and used to control the transmitting circuit to generate an electromagnetic wave signal; the antenna sensing plate is electrically connected to the transmitting circuit to receive the electromagnetic wave energy, and the electromagnetic wave energy is emitted to the electromagnetic pen to receive. The receiving circuit is electrically connected to the antenna sensing board and the auxiliary circuit, and is configured to receive the resonance signal resonated by the electromagnetic pen and transmit the resonance signal to the application circuit. The towel should compare the frequency of the electromagnetic wave signal and the resonance signal. If the frequency of the electromagnetic wave signal is different from the resonance signal, the phase lock Ο [0009] [0010] 电路 The circuit adjusts the frequency of the electromagnetic wave signal, so that the transmitting circuit transmits the electromagnetic wave signal of the new frequency. . [Embodiment] Some embodiments of the present invention will be described in detail below. However, the present invention may be widely practiced in other embodiments, and the scope of the present invention is not limited by the detailed description, which is based on the scope of the following patents. The second figure shows a schematic diagram of a spreader circuit tablet of the present invention. As shown in the second figure, the tablet 20 in this embodiment mainly includes an application circuit 202, a transmitting circuit 204, a sensor board 206, an electromagnetic pen 208, a receiving circuit 210, and a phase lock loop (PLL). Circuitry 212. The transmitting circuit 204 is electrically connected to the application circuit 202 and the sensing antenna board 206, the application circuit 202 of the tablet 20 is used for calculating the touch coordinates and pressure of the electromagnetic pen, and the control application circuit 202 controls the transmitting circuit 204 to sense the antenna. The board 206 transmits or stops transmitting a fixed frequency electromagnetic wave (also referred to as a fundamental frequency signal). At this time, the sensing antenna board 206 transmits the received electromagnetic wave signal of a fixed frequency (e.g., 375 kHz) to the electromagnetic pen 208, and the LC resonance circuit (not shown) on the electromagnetic pen 208 generates resonance. When the electromagnetic pen 208 is pressed down (ie, 100117627 Form No. A0101, page 5/12 pages, 1002029615-0 201248486, the action of writing) changes L or changes C to change the frequency point, and the receiving circuit 210 receives a different base. When the frequency frequency signal is transmitted, the signal is sent to the application circuit 202 for pressure processing to generate a pressure gradation. The phase-locking circuit 212 is electrically connected to the application circuit 202 and the transmitting circuit 204, respectively. [0011] However, referring to the second figure, unlike the conventional tablet, the application circuit 202 of the present invention first controls the phase-locked circuit 212 to be sent. The frequency of the energy is then controlled by the application circuit 202 to control the transmitting circuit 204 to transmit or stop transmitting the electromagnetic wave signal to the sensing antenna board 206. After transmitting the electromagnetic chopping energy, the application circuit 202 controls the receiving circuit 210 to receive the antenna and stop receiving the energy fed back by the electromagnetic pen 208. After receiving, the application circuit 202 will process the signal to send the coordinates and pressure values (touch identification). Before the next signal transmission and reception operation, the application circuit 202 of the present invention compares the received signal with a received signal to determine whether the electromagnetic pen is depressed. If the resonance point of the electromagnetic pen 2〇8 is shifted, the 'application circuit 2〇2 controls the phase lock circuit 212 to adjust the frequency so that the frequency can be adjusted following the resonance point on the electromagnetic pen 2〇8, so that the transmission circuit 204 can transmit The electromagnetic wave different from the previous fundamental frequency (such as 375Khz) is given to the electromagnetic pen 208, so that the electromagnetic pen 208 can receive the strongest energy all the time, thereby reducing the identification error. [0012] Figure 2B shows a schematic diagram of the signal of the tablet of the present invention. As shown in the second B diagram, for example, when the fundamental frequency is 375 kHz, the resonant frequency of the electromagnetic pen 208 is also 375 kHz. When the electromagnetic pen 2 〇 8 is depressed, the resonance frequency is shifted to 385 kHz, and the application circuit 202 controls the phase lock circuit 2 〇 6 to convert the fundamental frequency to be transmitted by the transmission circuit 204 to 385 kHz. Therefore, the electric power 100117627 form number A0101 page 6 / total 12 pages 1002029615-0 201248486 The magnetic pen 208 does not fill the received fundamental frequency number due to the deviation of the resonance frequency, which causes an error in the touch recognition. However, it should be noted here that the above-mentioned frequency values 375 ΚΗζ and 385 ΚΗζ are merely explanations of the electromagnetic pen 208 offset problem, and do not limit the possible emission of the tablet 2 本 of the present invention. [0014] [0015] The energy frequency is limited to 375ΚΗζ and 385ΚΗζ. As long as the electromagnetic pen 2〇8 is offset, the application circuit 202 compares the received signal with the signal received by the pen, and if the signal offset occurs, the application circuit 2〇2 controls according to the signal offset. The phase lock circuit 212 adjusts the frequency to control the transmission circuit 204 to transmit the electromagnetic energy of the new frequency. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the present invention should be included in the following. Within the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS The first diagram is a schematic diagram of a conventional digital tablet; the first B is a schematic diagram of a signal of a conventional digital tablet; and the second A is a schematic diagram of a digital display panel of the spread spectrum circuit of the present invention; Figure 2B is a schematic diagram of the signal of the tablet of the present invention. [Main component symbol description] 10 Digital tablet 102 Application circuit '104 Transmitting circuit 106 Antenna sensing board 108 Electromagnetic pen 110 Receiving circuit 100117627 Form number A0101 Page 7 / Total 12 pages 1002029615-0 201248486 20 202 204 206 208 210 212 Digital tablet Application circuit transmitting circuit antenna sensing board electromagnetic pen receiving circuit phase-locking circuit 100117627 Form No. A0101 Page 8 / Total 12 pages 1002029615-0