TW401681B - Horizontal deflection S-shaped correction signal circuit with variable capacitance - Google Patents

Abstract

A horizontal S-shaped correction signal circuit having a correct condenser disposed in a cathode ray tube (CRT) horizontal deflection circuit such as in a television receiver, a display monitor, etc. in particular, a horizontal S-shaped correction signal circuit which is capable of obtaining an accurate correction effect and a desired adjustment. The total capacitance of the correction condenser Cs for a horizontal deflection circuit is variable by selectively connecting in parallel therewith correction condensers Cs1 and Cs2 by switches SW1 and SW2 during the scanning interval. Therefore, the correction characteristic is improved. Namely, it is possible to obtain a highly accurate S-shaped correction signal. In addition, it is possible to independently control the width of the front portion and rear portion of the horizontal scanning interval by controlling externally inputted direct control current signals DA-CTL1 and DA-CTL2. Furthermore, it is possible to vary the S-shaped correction signal width depending on the vertical scan position on the screen.

Description

401681

V. Description of the invention (

A main correction capacitor indicates a horizontal deflection circuit. Due to the familiar structure currently formed, the detailed description of its action is shown in Figure 3. As shown in FIG. 3, the capacitor Csi and the rear sections SW1 and SW2 are separately. The high-resistance discharge (C si and C s2) are connected by a low-efficiency transistor (F, F BT represents a flyback transformer, and + B voltage. The horizontal deflection circuit has been described in detail in the work. This is omitted, and the S-type correction capacitor Cs and the former correction correction capacitor C s2 used in the invention change the capacitance and switch K to switch capacitors Csl and Cs2. In addition, high resistance: not shown in the figure) and correction Capacitor connection. Each switch SW1 and SW2 ET) constitutes * and the stick is generated according to the timing pulse ----:-: --- ---------- order-< please read the note on the back first Matters need to fill in this page)

The generated first and second control signals C -C TL1 and CS-printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy c TL2 are switched on and off respectively. The waveform trimming unit 12 receives the flyback pulse signal from the peripheral winding 1 of the flyback I voltage transformer FBT and sends the trimmed signal to the time pulse generator 1 1, and it also receives a vertical object line signal. And a set of control signal numbers DA-CTU and DA-C TL2 〇 The operation of the horizontal deflection circuit in FIG. 3 will be described here with reference to K by referring to FIG. 4. The component architecture and operation of the time pulse generator 11 will be described later. FIG. 4A illustrates the flowing current biased to the yoke, FIG. 4B illustrates the first control signal C S-C T L 1, and FIG. 4 C illustrates the second control signal C S-C T L 2. In the first part of the horizontal scanning section, time section t 1, the first control -9-This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm). 401681 A7 _ B7___ V. Description of the invention (1) Background of the present invention 1 * Field of the present invention The present invention relates to an S-type correction signal circuit having an S-type correction signal capacitor whose capacitance is controllable and configured in a horizontal direction In the circuit, particularly in an S-type correction signal circuit having an S-type correction signal capacitor, the capacitance is controllable in sections during horizontal scanning. 2 · Explanation of the traditional technology Figure 1 illustrates the traditional horizontal deflection circuit. In this illustration, HD indicates a horizontal drive signal generator, TR indicates a horizontal output transistor, D indicates a damping diode * Cr indicates a vibrating container, L DY indicates a horizontal deflection coil, and Cs indicates an S-type correction signal capacitor. F BT represents the flyback transformer, + B represents the horizontal bias circuit voltage. Since the operation of the horizontal deflection circuit is very familiar in the industry, the description of the operation here will be omitted. Therefore, only the S-shaped correction signal 霣 container Cs plus M will be described. First, as shown by the solid line in 2A, the bias current flowing through the bias has ideally a straight line characteristic. However, in fact, due to the loss of the resistance of the damping diode SD, the loss of the operating resistance of the horizontal output transistor TR, the effective resistance value of M and the bias to the vehicle, etc., the non-direct dielectric characteristics of the bias current are caused, as shown in the figure. The dotted line. The horizontal screen size (scan length) is crucible in the first half of the scan bias. Similarly, according to the characteristics described in the above column, the second half of the scan is gradually reduced. So * the scan line on the left side of the screen is stretched horizontally *, and the Chinese paper standard (CNS) A4 (210X297 mm) is used in the paper size of the screen -------- 1¾ .--- --- 1T ------ Φ.,---{Please read the notes on the back before filling this page) Printed by the Central Consumers' Bureau of the Ministry of Economic Affairs, Industrial and Consumer Cooperatives 401681 A7 _B7_ · _ V. Description of the Invention -(Even) The scanning line on the right side of the screen is shortened horizontally, in other words, it will cause screen dislocation on both sides of the screen. Furthermore, because the Braun tube has a non-spherical surface, so there is a non-linear characteristic in it ", so ^ 妁 5: · Like" In Dragon Armor: The interrogation part is reduced, but at the edge of the screen Then it is stretched out. In other words, IB ·. Tm can be M_M%: Tochi-out. Mu. In order to correct the above-mentioned distortion problem, an S-type correction signal capacitor Cs is added. The inductance value and capacitance value of the horizontal deflection S path will cause the horizontal deflection oscillation signal, and the capacitor Cs and the horizontal deflection coil LDY form a series LC circuit, so κ realizes the S-type correction (replenishment) of the horizontal deflection signal. This correction is done according to the degree of distortion. For example, if the ringing present is twice the horizontal synchronization signal, the correction current will become the gripping current shown in FIG. 2B. Therefore, it is possible to obtain a horizontal bias current characteristic as shown in 谰 2C by correcting the current. That is, * the current tilt is reduced before the horizontally biased flow scan section and the terminal section, and the horizontal vibration is reduced. In the middle of the horizontal scan section, the S flow gradient is increased, and the horizontal amplitude is changed. Widen. Therefore, the image distortion caused by the non-linear characteristics of the biased flow and the non-spherical surface of the Braun tube may be reduced accordingly. In the conventional S-type correction signal circuit stated above, because the capacitance of the correction capacitor C 3 is fixed, it will be difficult to obtain the required high accuracy correction effect. In addition, it is necessary to control the Capacitors are also very difficult. This paper is applicable to national standards (CNS> A4 specification (210X297 mm)) 1 pack --------------------- (Please read the precautions on the back before filling (This page) Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative Co., Ltd. 401681 A7 _B7 V. Description of the invention ($) The outline of the invention is as described above. The purpose of the invention is to provide a horizontal value to the s-type correction signal. Following the aforementioned problems encountered in transmission technology. Another object of the present invention is to provide an improved horizontal deflection S-type correction signal® circuit which can be easier by selectively embedding a correction capacitor to the horizontal deflection circuit. The capacitance of the correction capacitor is controlled by ground to make it possible to obtain a highly accurate correction effect. In order to achieve the above purpose, according to the present invention, a horizontally biased S-shaped correction signal path is included, which includes a correction® container and The capacitance is variable, and it also contains a controller, which uses M to control the total capacitance of the correction capacitor by switching on M in the horizontal scanning interval, in order to correct the problem of horizontal image loss. The present invention provides a horizontal S-type correction circuit * which includes a front-end portion and a rear-end portion correction capacitor connected in parallel with the main correction capacitor il. The first opening switch connects the front-end correction container to the main correction capacitor. The two-stage switch connects the rear-stage calibration® container to the main calibration capacitor *, while the controller is used to control the first and second stages to change the capacity of the calibration seedlings. The first switch is activated and the second switch is activated in the later part of the horizontal scanning period * so as to correct the horizontal image distortion. Other advantages, objects, and characteristics of the present invention will be -6-^ »in the following description.准 Use Chinese national standard (0 shame > man 4 specifications (210 > < 297 mm) ~ ------ 1T ------ ^ >.-. (Please read the note on the back first Matters refill this ) 301681 A7 B7 V. The description of the invention (f) is more obvious. Brief description of the appendix The present invention will be more fully understood after the detailed description made below, and the accompanying appendix is provided as an example only The application of K will not be limited to the present invention, and the appendixes are as follows: 1 shows the traditional Kushiro road sign with a horizontal bias toward Kushiro; 鼷 2A to B2C show the S-type of the Kushiro road in FIG. 1 Waveform drawing of the correction characteristics; -------- ▲-(Please read the precautions on the back before filling this page) The school-type special S-number to the letter is flat and the school water-type uses S Caimingming Road to generate electricity This example is based on the example of the electric power shown in Figure Road, which is biased to C, Figure 4, Road S, and Road A, S3, and Electricity. 4 Drawing No., letter No., letter S, No. 3, Road plaque, under pressure. 1 will be., Showing the H example; the wave capacity of the ring device shown in Figure 5 is 0 when the sequence is 3, the structure is like the example K, and the block 1 is 6

, ST .—Road 6 of circular wave letter printed by the Central Bureau of quasi-Ministry of Economy, Ministry of Economic Affairs, Shellfish Consumer Cooperatives. The picture shows circle D7, and the picture of A 7 is produced by Hengpu in Mingfa A. According to the 8 9 fine root diagram, the signal of the example signal of the signal line is shown in Figure D. The H3 is shown in Figure D. The explanation of 8 is to solve the problem. The size of this paper uses the Chinese National Standard (CNS) A4 specification (2 丨 0 parent 297 mm) 401681 A7 B7 Central sample of the Ministry of Economic Affairs of the Bayer Consumer Cooperatives. Type correction signal in the road—This will cause the oscillation of the horizontal deflection scanning signal according to the sense value of the horizontal deflection circuit. Therefore, the horizontal deflection has the characteristic of S type. 9 In addition, the distortion of the screen image is reduced. In the present invention, it is possible to change the capacitance value K of the correction container during the horizontal deflection scan to control the characteristics of the S-type correction signal. Achieved 0 Therefore, it is possible to achieve a highly accurate correction. Furthermore > Correcting the correction signal of the container's container when the front and rear sections of the container during horizontal scanning are applied. In addition to this, Outside »It is possible to change the interval of the scanning time by changing the capacitance. In this way, the S-type correction of the S-bias signal can be applied to balance the front and back sections of the horizontal scanning signal. Aspheric distortion, depending on the vertical position of the cathode beam tube of the scanning beam. There are different spherical distortions. At the end, the range of aspherical distortion that occurs at the left and right ends of the horizontal scan is above and below the cathode ray tube The wider and central part will be narrower. In the present invention, by changing the horizontal sweep at each vertical media position The period of time during the control period is likely to reduce the image distortion caused by the aspheric distortion of the cathode medium tube. The example of circle 3 is shown as the horizontal deflection of the horizontal S-type correction signal circuit according to the present invention. In this leg, $ Η D indicates a horizontal drive signal generator 9 TR indicates--horizontal output 霣 crystal 馒, D indicates a damping two platform 9 C Γ indicates--vibrates 霣 container, L DY indicates a-horizontal Biased media circle * C s -8- This paper size uses China «Home Standard (CNS > A4 size (210XM7 mm) 401681

V. Description of the invention (

A main correction capacitor indicates a horizontal deflection circuit. Due to the familiar structure currently formed, the detailed description of its action is shown in Figure 3. As shown in FIG. 3, the capacitor Csi and the rear sections SW1 and SW2 are separately. The high-resistance discharge (C si and C s2) are connected by a low-efficiency transistor (F, F BT represents a flyback transformer, and + B voltage. The horizontal deflection circuit has been described in detail in the work. This is omitted, and the S-type correction capacitor Cs and the former correction correction capacitor C s2 used in the invention change the capacitance and switch K to switch capacitors Csl and Cs2. In addition, high resistance: not shown in the figure) and correction Capacitor connection. Each switch SW1 and SW2 ET) constitutes * and the stick is generated according to the timing pulse ----:-: --- ---------- order-< please read the note on the back first Matters need to fill in this page)

The generated first and second control signals C -C TL1 and CS-printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy c TL2 are switched on and off respectively. The waveform trimming unit 12 receives the flyback pulse signal from the peripheral winding 1 of the flyback I voltage transformer FBT and sends the trimmed signal to the time pulse generator 1 1, and it also receives a vertical object line signal. And a set of control signal numbers DA-CTU and DA-C TL2 〇 The operation of the horizontal deflection circuit in FIG. 3 will be described here with reference to K by referring to FIG. 4. The component architecture and operation of the time pulse generator 11 will be described later. FIG. 4A illustrates the flowing current biased to the yoke, FIG. 4B illustrates the first control signal C S-C T L 1, and FIG. 4 C illustrates the second control signal C S-C T L 2. In the time period t 1 at the front part of the horizontal scanning section, the first control is -9-This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) A7 401681 B7_ V. Description of the invention ()- ------- Called ---- I equipment -------- Order · (Please read the notes on the back before filling this page) The signal CS-CTL l · is output, and the switch SW 1 Was started. In the latter part—the time period t 2 previously set, the second control signal CS—C TL2 is output, and the switch SW 2 is actuated. Therefore, the correction capacitor C s is connected in parallel to the correction capacitor Csl of the preceding section in the time section t 1 of the previous section of the horizontal scanning section. After the rib, the front-correction S-type capacitor Csl is cut off, and only the S-type capacitor Cs is connected. At the time t2, the correction capacitor Cs is connected in parallel to the correction capacitor Cs2c in the latter part. Fig. 5 illustrates the voltage signal waveform of the signal correction capacitor Cs in the S-type signal. In the present invention, in the time periods t 1 and t 2, the characteristic of the broken line when the straight line feature is transformed. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs according to changing the straight line characteristics into dotted lines. In each horizontal scanning section, the capacitance of the S-type correction signal capacitor is changed, so the oscillation frequency of the horizontal bias signal L 3 Y is changed. change. The characteristics of the correction capacitor control the parallel connection of the front-end and back-end corrections C si and C S2 of the horizontal scanning by controlling the time sections of the first and second control signals C s-CTL 1 and CS-CTL 2, and change accordingly. Therefore, it is possible to correct horizontal distortion of the image and obtain correctness. In particular, it is possible to reproduce a balanced S-type correction in the front and rear sections of the horizontal scanning section. Returning to the practical example of FIG. 3, the timing pulse generator 11 receives a sawtooth waveform signal, which is obtained by the FBT pulse of Zhou Fang gate 1 3 of the flyback transformer through the waveform shaping army 1 2 and thrown at The vertical parabolic wave signal of the cathode ray tube and the direct current control signal DA — CTL 1 and -10- This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) A7 401681 ___B7____ 5. Description of the invention () DA — CTL 2 is output to external connection components such as microprocessors. ---- ： ----: ——————-------- Order. (Please read the notes on the back before filling this page) As shown in Figure 6, the timing pulse balance generator 11 includes first and second direct current voltage adders 15 and 16, first and second comparators 17 and 18, and a reverse amplifier 19. The first direct current voltage adder 15 receives a vertical parabolic wave signal M and a first direct current control signal D A-CTL1. The second direct current voltage adder 16 receives a vertical parabolic wave signal and a second control direct current signal DA — CTL2. The comparator 17 receives the sawtooth waveform signal with its polarity separately via the inverting amplifier 19 to reverse K and the output signal from the first direct current voltage adder 15 and outputs a first control signal CS-CTL1. The second comparator 18 individually receives the sawtooth waveform signal K and the output signal from the second direct current voltage adder 16 and outputs a second control signal D S-C TL2 ^

The operation of the timing pulse balance generator 11 will be described by referring to FIGS. 7A-7D and 8A-8D. Printed in the figure by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the waveform shown in FIG. 7A corresponds to the input signal of the second comparator 18 and represents the interaction between the vertical chirp waveform and the sawtooth signal in a circle. Yeah. Here, the vertical object wave signal is combined with the direct current control signal DA-CTL2 via the second direct current voltage adder 16. In addition, part A indicates the value of the vertical parabolic wave signal at the vertical screen position above the cathode ray tube, part B indicates the value of the vertical parabolic wave signal at the vertical screen position in the middle of the cathode ray tube, and part C indicates the vertical parabolic wave signal value The vertical object wave signal value at the lower vertical screen position. -11- This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 401681 A7 B7 V. Description of the invention () (Please read the notes on the back before filling this page) Figure 7 B The waveform is an enlarged waveform diagram during a horizontal scan in FIG. 7A. The values of parts A, C and B of the waveform shown in Fig. 7A correspond to the vertical object wave. When the value of the sawtooth wave exceeds the value of the vertical object wave signal, the second comparator 18 will output a second control signal C S-C T T L 2. The waveform of the second control signal CS-C TL2 is shown in Figs. 7C and 7D and corresponds to the control signal in the second half of the horizontal scanning period. In part B, this is the vertical screen position in the center of the cathode ray tube, because the value of the vertical M object wave signal is increased, and the value of the sawtooth wave in this section exceeds the value of the vertical parabola signal, as shown in Figure 7C. The output period of the signal CS — CTL 2 is shortened. In addition, the vertical A position above and the vertical position C below the cathode ray tube, because the value of the vertical object wave signal is reduced, and the value of the sawtooth wave signal in this section exceeds the value of the vertical object wave signal, such as As shown in circle 7 D, the output section of the control signal C SC R2 is extended. Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives. The waveform shown in Fig. 8A corresponds to the input signal of the first comparator 17 and represents the correlation between a vertical parabolic wave signal and a sawtooth wave signal of an electric field. Here, the key tooth wave signal is inverted by the inverting amplifier 19, and the vertical object wave signal is combined by the first direct current voltage adder 15 and the direct current control signal D A-C T L 2. In the illustration, the portions A ', B' and C 'are the same as the portions A, B and C shown in Fig. 7A. The waveform shown in Fig. 3B is a large view of the wave shown in Fig. 8A during a horizontal scan. When the vertical parabolic wave signal exceeds the value of the sawtooth wave signal, the first comparator 17 will output the control signal CS-CTL 1, and the second comparator -12-This paper size applies to China National Standard (CNS) A4 (210 X 297 male cage) A7 401681 ____B7 ___ V. Description of the invention () 1 8 is the same. ----; --- I ---- • -install -------- Order · (Please read the unintentional matter on the back before filling this page) Therefore, as shown in Figures 8C and 8D The output signal CS — CTL1 becomes the control signal of the front part of the horizontal scanning section.圔 9 shows the results of the pulse width changes of the first and second control signals CS — CTU and CS — CTL2 on the screen 2 1 of the cathode ray tube during the vertical scanning. In the figure, the arrows indicate the pulse widths of the control signals C S-C TL1 and C S-C TL2 during one horizontal scan. In this figure, the pulse width of the control signal is wider at the upper and lower portions A and C of the screen 21, and narrower at the central portion B. In the horizontal quotient of the cathode ray tube, the range of aspherical surface distortion that occurs in the left and right parts (Lin margin) is increased in the upper and lower parts (edges) of the screen, while it decreases in the central part. In addition, the pulse width that forms the correction varies with the range of distortion, so it is possible to achieve a better correction. The consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed back to Figure 6. When the value of the vertical parabolic wave signals shown in Figures 7B and 8B is increased, the direct current control signals DA-C TL1 and DA-C TL2 are S — Microcomputer control, etc., so the pulse width of the control signals from the first and second comparators 17 and 18 can be changed. Therefore, the values of the first and second direct current control signals D A-C L1 and D A-C T L 2 can be corrected, so that the correction characteristics of the KS type can be adjusted. It is possible to modify the present invention individually. For example, the first and second switching means that the number of switching switching correction capacitors can be changed, and the switching interval can be changed.

In addition, through the use of direct current control signals DA — CTL 1 and DA -13- this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 public love) 401681 A7 B7 V. Description of the invention () — CTL 2 is possible Controls the correction width of the S-type correction signal. What's more, it is possible to adjust the horizontal scanning distortion of the vertical position of the screen. In the present invention, the first and second direct current voltage adders 15 and 16 may be omitted. One of the direct current voltage control signals D A — C T L 1 and D A — C TL2 or the vertical object wave signal can be input to the first and second comparators i 7 and 18, so that it can be compared with the value of the sawtooth wave signal. In addition, the signal value compared with the M and sawtooth wave signals may be a fixed value. The correction capacitor in the S-type correction signal circuit is installed in the water two-way deflection circuit, and it is possible to obtain a good correct correction effect and variably adjust the correction. Although the preferred embodiment of the present invention has been disclosed using K as an example of t 5, those skilled in the art will appreciate that various modifications, ages, and changes are possible without departing from the attached靥 The patent application does not explain the spirit and field. : ---: ---- ^ -------- Order. (Please read the precautions on the back before filling in this page) Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives This paper is applicable to China Standard (CNS) A4 specification (210 X 297 mm)

Claims (1)

401681 A8 B8 C8 D8 Sixth, the scope of patent application (please read the notes on the back before filling out this page) 1 · A horizontal s-type correction signal circuit, which is used in the horizontal scanning correction circuit of the horizontal deflection circuit of the cathode-ray tube. Contains: a plurality of correction capacitors, the capacitors are connected in series to a horizontal temperature line; a selective switching device for changing the overall capacitance of the correction capacitor; M and a capacitor for controlling the switching device The control device uses M to switch the switching device and change the overall capacitance of the calibration electric passenger during the horizontal scanning, and K compensates the horizontal image distortion. 2 · A horizontal S-type correction signal circuit, which is pseudo-incorporated in a horizontal scanning correction circuit for a horizontal deflection circuit of a cathode ray tube, and includes: a front section and a rear section correction circuit, which are connected in parallel to a The main correction capacitor is connected in series with the horizontal leakage coil. The first switching mechanism connects the front part of the correction capacitor to the main correction capacitor by K switching. The second is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. A switching mechanism, which 甭 K switches the rear part of the correction circuit to the main correction capacitor; and a control mechanism for controlling the first and second switching mechanisms to change the capacitance of the correction signal circuit. By turning on the first switching control during the first part of the horizontal scanning period and turning on the second switching mechanism during the latter part of the horizontal scanning period, horizontal image distortion can be compensated. 3 · If you read the correction circuit in item 2 of the patent scope, the control mechanism The paper size is in accordance with China National Standard (CNS) A4 specification (210 × 297 mm) 401681 A8 B8 C8 D8 Sixth, the scope of patent application (please read the notes on the back before filling out this page) 1 · A horizontal s-type correction signal circuit, which is used in the horizontal scanning correction circuit of the horizontal deflection circuit of the cathode-ray tube. Contains: a plurality of correction capacitors, the capacitors are connected in series to a horizontal temperature line; a selective switching device for changing the overall capacitance of the correction capacitor; M and a capacitor for controlling the switching device The control device uses M to switch the switching device and change the overall capacitance of the calibration electric passenger during the horizontal scanning, and K compensates the horizontal image distortion. 2 · A horizontal S-type correction signal circuit, which is pseudo-incorporated in a horizontal scanning correction circuit for a horizontal deflection circuit of a cathode ray tube, and includes: a front section and a rear section correction circuit, which are connected in parallel to a The main correction capacitor is connected in series with the horizontal leakage coil. The first switching mechanism connects the front part of the correction capacitor to the main correction capacitor by K switching. The second is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. A switching mechanism, which 甭 K switches the rear part of the correction circuit to the main correction capacitor; and a control mechanism for controlling the first and second switching mechanisms to change the capacitance of the correction signal circuit. By turning on the first switching control during the first part of the horizontal scanning period and turning on the second switching mechanism during the latter part of the horizontal scanning period, horizontal image distortion can be compensated. 3 · If the correction circuit of item 2 of the patent scope is read in series, the control mechanism of this paper is not applicable to the Chinese National Standard (CNS) A4 specification (210 × 297 mm) 401681 abI C8 D8 μ changes the mechanism of one interval during the horizontal scanning in the vertical electric field interval. 4 · If the correction circuit of the second patent application scope, the control mechanism includes a mechanism to change the horizontal scanning period in the vertical picture field interval. ------.-- Bull out ------ Order ---; ---- line (please read the precautions on the back before filling this page) The paper size of the paper is applicable to China National Standards (CNS) Α4 (210X297 mm)