JPS59121381A - Display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an electromagnetic deflection type display device.

In particular, it relates to the deflection amplifier of the device.

Generally, in a control display device or a simulator display device, when displaying an image using the `rv raster, a higher resolution display may be required in one part. Moreover, if this high-resolution part is to be moved to an arbitrary position on the screen at an appropriate speed, it is impossible to achieve this by using the copper volume method of a normal TV with a flyback transformer, and random scanning is required. A deflection amplifier that can be used is required.

An example of a conventional polarization amplifier capable of random scanning is shown in FIG. ) is a ti'rf amplifier, 12) is an output amplifier, (3) is a deflection coil, and (4) is a feedback resistor.

In the above deflection amplifier, the human input signal is transmitted through the preamplifier (1)
), the voltage is amplified to widen the dynamic range, and the current is further amplified to drive the output amplifier (2).

The output amplifier (2) increases the wax flow width and the deflection coil (3)
to drive. IJIi] The forward current passing through the IOI coil (3) is returned to the preamplifier +11 by the feedback resistor (4) to form a feedback circuit.

In the conventional deflection amplifier shown in Fig. 1, @large deflection speed is determined by the maximum positive or negative voltage at which the output amplifier (2) drives the deflection coil (3), so the 118Ii direction speed is increased. In order to do this, it was necessary to increase the preamplifier (11)'s dynamic range and to increase the power supply voltage of the output amplifier (2+), which resulted in a large power loss.

Here, in conventional equipment, the resolution is now %.

For example, superimposed on a raster display with a screen width of 1000&' (called a large screen), high-resolution display parts corresponding to a screen width of 4000ν (115 x 115 on the screen, called small screens) are displayed in two places. In addition, assume that the horizontal scanning time is 20 μs and the retrace time is 5 μS. In this case, the time to scan 1000 horizontal rasters is 25 m.
With s! evening. In addition, the scanning speed and retrace speed of the small screen are also 1
If the raster scanning speed and retrace speed of the screen width are the same, the raster width is 115, so the scanning time is 4 μs and the retrace time is 1 μs. In this case, the resolution of the small screen is 40
Since the size is 115, the number of scanning lines per 1 small screen is 1000×800 (lines).

Therefore, the time to scan two small screens is 5x800x
2 (μ5)-8 (ms).

If the display refresh rate is 3 Q I (z, then
Since the display cycle is 33.33m5, the time available for positioning the small screen and returning to the large screen is 33.33-25-8-0.33 (m8), which is 330/3 per positioning. ~110 (μS).

In the case of interlaced display, the number of times of positioning is 6, so 50 μs is taken as one positioning time.

Consider the remaining time as free time.

Here, for example, the inductance of the deflection coil is 5Q7
d-1, the current required for maximum deflection is 14A.

The voltage applied to the deflection coil during rask scanning is 50X14
Xヱ-70V 0 The voltage applied to the deflection coil during return is 14x2--280v ""? These voltages are the same for large screen rasters and small screen rasters.

Also, the maximum voltage required for one positioning is 4X2 +50X-□-±28V 50 Next, consider vertical deflection.

Here, the vertical scanning time when displaying a large screen is 25
m s , and the vertical scanning time when displaying a small screen is gms. Vertical retrace time corresponds to positioning time,
As mentioned above, this is a 50μ key.

Considering that the characteristics of the deflection coil are almost the same for horizontal deflection and vertical deflection, the voltage to be applied to the deflection coil during vertical retrace is the same as the horizontal positioning voltage, and is -28V at maximum.

From the above, the power loss of the horizontal deflection amplifier, which is considered to have a large power loss, will be calculated. For the sake of simplicity, let us consider the case where only the sweep corresponding to the raster of a large screen is always performed (scanning in 20 μs and returning in 5 μs is repeated).

FIG. 2 schematically shows the output amplifier +21. In the figure &11 is 1'J P N transistor, 1221 is PNi'
) is a runrasta. An actual output amplifier uses several transistors connected in parallel.

Figures 3 (a) to (f) show the voltage and current waveforms of the output amplifier f21, where (a) is an output current waveform diagram and (b)
) is the output voltage waveform diagram, <c> is the collector-emitter voltage waveform diagram of the NPN transistor (21J), (dJ is the emitter current waveform diagram of the NPN transistor 21+, and (e) is the PNP) run raster. A collector-emitter voltage waveform diagram of @, and (f) in the same figure is an emitter current waveform diagram of a PNP transistor.

Here, the power supply voltage of the output amplifier (2) is +90V and -
The voltage is 300V.

From Figure 3, power loss P of NPN transistor t211
IllPNP ) Power loss P2 of run raster. and the power loss Po1 of the output amplifier +21 is calculated as 14
10 14 2.5 Ptt ”390x, x +20X F X -
1,106WP01-PII+P2+ -i, 435W
becomes.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional display device, and in an electromagnetic deflection type display device, the deflection amplifier is equipped with a changeover switch and a power supply for horizontal retrace, and during normal operation, linear amplification is performed. Random scanning is possible by outputting the output of the width part to the deflection coil, and applying the output of the horizontal retrace power supply directly to the deflection coil using the changeover switch during horizontal retrace during rv raster display. and without significantly increasing power loss (
The purpose of the present invention is to provide a display device that enables high-speed rask scanning.

An embodiment of the present invention will now be described with reference to the drawings. In Figure 4, +11) is a preamplifier, and d2 is an output amplifier.
], and these constitute a linear amplification section d01. Also, υ3) is the deflection coil, u slope is the feedback resistance,
115+ is the deflection speed detector, u6) is the switch 3! ,
+1'/l is a switch, S2. l] 81 is a horizontal retrace power supply whose voltage is E.

FIG. 5 schematically shows a part of the preamplifier 1ll in FIG. 4, the switch 5Jde+, the switch Sz(17), and the output amplifier 112+. In the actual output amplifier a, a plurality of transistors are operated in parallel.

(161) is the first diode, (163) is the second diode.

(111) is the first transistor of the preamplifier (Ill), (112) is the second transistor. (121
) is an NPN transistor with an output amplifier U, (12
2) is a PNPI-run raster. (171) is the diode of the switch 52α power.

(172) is a transistor.

Note that the power supply voltage of the output amplifier 113 is El + E2.

Next, the operation will be explained.

The voltage of the human power is amplified by the Iv7T amplifier aIJ to widen the dynamic range, and the current is further amplified in the middle of the current tank through the switch 51161 to drive the output amplifier tI21. The output amplifier d2 amplifies the current and drives the deflection coil 03I through the switch 52αη. The current flowing through the deflection coil is fed back to the preamplifier 0 through the feedback resistor Φ, forming a feedback circuit.

In addition, the output of the preamplifier αD is transmitted to the deflection speed detector 051
is also entered. Here, for example, high-speed deflection during horizontal retrace is detected. To detect the horizontal retrace line with this deflection speed detector o5), switch SIαQ and switch 52an connect the preamplifier aD and output amplifier IJ2 to the deflection coil (1
31 and switch s2αη to the deflection coil o3.
Directly connect the horizontal retrace type @i +181 via.

When the horizontal retrace is completed, the horizontal retrace power supply u81 is disconnected from the deflection coil 03 by the switch S t (17).

switch 51α6] and switch SJ7) preamplifier aD.

Connect output amplifier IJ2 to deflection coil u3.

6(a) to 6(e) show the voltage waveforms of the main parts of FIG. Waveform diagrams, (b) is a base voltage waveform diagram of the transistor (111), and (C) is a gate voltage waveform diagram of the transistor (172), which is the other output of the deflection speed detector (15). , (d) of the same figure shows the source voltage of the transistor (172), and (e) of the same figure is an output voltage waveform diagram of the deflection amplifier according to this embodiment.

Next, the above operation will be explained in more detail.

First, when the deflection speed detector (151) detects the horizontal retrace line, the deflection speed detector u51 is connected to the base of the transistor (161) of the switch S+u6 and the gate of the transistor (172) of the switch 52 (19). Figure 6 (
Output the voltages shown in a) and (C). The above transistor (161) is.

Normally, the base potential is E, which is the same as the emitter, and it is in a cutoff state, but during horizontal retrace, the base potential of the transistor (16υ) is E due to the output voltage of the deflection speed detector aS.
l-Q becomes 7V, which is lower than the emitter potential and becomes conductive. If this transistor (161) conducts, the first transistor (111) of the preamplifier (II)
As shown in Figure 6(b), the base potential changes from E4 to E,
-Q, becomes 8v and becomes cut off. If this first transistor (111) is cut off, the N of the output amplifier (12)
The PN transistor (121) is cut off because no base current flows.

On the other hand, the gate potential of the transistor (172) of the switch SJη is E as shown in FIG. 6(C) during horizontal retrace.

Then, the voltage changes to s+10 V and becomes conductive. Then, the voltage of the horizontal retrace power supply 081 is applied as an output to the deflection coil u3 through this transistor (172). Then, the voltage E3+ of the horizontal retrace power supply u81
If 10V appears at the output, the P N of output amplifier 02
P ) run raster (122) is disconnected from the output by the switch 52 (1η diode (171). Then, the IQ P
The emitter of 21) has the same potential E as the output voltage, +i0V. The stiff potential also appears at the bases of the transistors (1, 21) and is applied to the first transistor (1, 21) of the preamplifier aD.
11) also becomes 'j++ 10 V, or this transistor (111) is in a cut-off state. Also, by the action of the switch s, (1G+ diode (1, 63)), the output amplifier (]4's NPNI- run raster (121)
emitter, base and @place amplifier dll PNP)
The collector of run raster (1, 11,) becomes floating.

In this way, the preamplifier 011 and the output amplifier (12) are disconnected from the output by the action of the switches 5l (16) and 52 (Iη), and the horizontal retrace power supply decoy is directly connected to the output.

Also, when the horizontal retrace is completed, the deflection speed detector (15)
is working switch 5IU61 transistor (161)
A voltage E is output to the base of the switch 52Qη, and a voltage E3 is output to the gate of the transistor (172) of the switch 52Qη to turn off both transistors (161) and (172). The transistor of this switch 5J71 (:1.7
2) is cut off, the horizontal retrace power supply (18) is disconnected from the output. On the other hand, when the transistors (161) of the switches s and uG+ are cut off, the first transistor (111) of the preamplifier υD becomes conductive with the base potential becoming E4, and the preamplifier (Ill) becomes conductive. It is connected to the output amplifier 0 bottle.

Further, the diode (171) of the switch 5241η is also made conductive, and the output of the output amplifier d21 is output to the deflection coil 03). In this way, the output is separated from the horizontal retrace power supply +181 and connected to the output amplifier d.

Here, regarding the above embodiment, the power loss will be calculated when only the sweep corresponding to the raster of a large screen is always performed under the same conditions as the conventional deflection amplifier.

FIGS. 7(a) to (h) show the output voltage of the embodiment of the present invention,
Current waveform and voltage of transistors in each part of the deflection amplifier.

Shows the current waveform. (However, L, E, -+90V, 1=
2--3Qv.

The voltage is ks-290V. ] The same figure (a) is a current waveform diagram of the deflection coil, the same figure (b) is the same voltage waveform diagram, the same figure (
C) is the NPN transistor (121) of the output amplifier a4
(d) is a collector-emitter voltage waveform diagram, and (d) is a current waveform diagram.

(e) of the same figure shows the output amplifier (PNP) run raster (1
22), the same figure (f) is the same current waveform diagram, the same figure (g) is the source-drain voltage waveform diagram of the switch 52 (1η switch transistor (172)), the same figure (h) is the same current waveform diagram.

From Figure 7, the NPN ) run raster (1
'21) Power loss P, 2. PNP transistor (12
2) Power loss P22. Switch transistor power loss P32 and total power loss P. Calculate 2.

P+z-70x"-4xLee 196W 25 ■・η-(=lOO) 2--280W
2 25 P3220 (Pa2 is only switching loss) PO
2-PI2+P22+P322476W The total power loss PlI2 is the power loss P of the conventional device. Compared to I, i' 0220, 33 PoI is obtained, and the power loss is improved to 33%.

Further, according to this device, the scanning speed during horizontal retrace can be increased, and the number of scanning lines can be increased, so that a high-resolution scanning plane can be obtained.

Furthermore, when performing TV scanning with a linear amplifier, it is difficult to perform scanning when there are many scanning lines, but with this device, the time required for horizontal constant distortion can be shortened, so the number of scanning lines can be reduced. Even when there are many numbers, scanning can be easily performed.

In addition, in the above embodiment, the switches S, f16+,
Using switch 52ση, deflection coil [13+ and preamplifier a1).

The output amplifier (12i and horizontal retrace power supply 08) is connected and disconnected, but two switches are not necessarily required (but it is better to use one switch instead). Also good.

As described above, according to the present invention, the deflection amplifier is equipped with a changeover switch and a power source for horizontal retrace, and 1 during normal operation, the output of the linear amplification section is output to the deflection coil, and when in rV raster display, During horizontal retrace, the output of the horizontal retrace power supply is applied directly to the deflection coil using the changeover switch, making it possible to perform random scans and high-speed raster scans without increasing power loss. There is a certain effect.

[Brief explanation of drawings]

Figure 1 is a block configuration diagram of a deflection amplifier of a conventional display device, Figure 2 is a schematic circuit diagram of an output amplifier in an electrical diagram, and Figure 3 is a diagram of the output amplifier of the above-mentioned deflection amplifier. 4 is a block diagram of a polarization amplifier of a display device according to an embodiment of the present invention. FIG. 5 shows a part of the preamplifier shown in FIG. 4, switches S1. Switch S2. A diagram showing a schematic configuration example of an output amplifier, FIG. 6 is a voltage waveform diagram of the main part in FIG. 5, and FIG. - A diagram showing current waveform teeth and voltage/current waveforms of the main transistors of the circuit shown in FIG. 5. [13+...deflection coil, u61...switch SI
(Switching switch)・αη゛・°Switch 52 (selector switch), 08)...Horizontal retrace power supply, Q■...
・Linear width part. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 2rj! J = 300V Fig. 3 Fig. 4 Fig. 6 Fig. 7 Mr. Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 1987-229765 2.
Invention title display device 3, Representative Hitoshi Katayama of the person making the amendment Dept. 4, Representative Jlj Column for detailed explanation of the invention of the specification to be amended and drawings (Figures 3 and 7) 66 Contents of the amendment (1) Ming! Book a, page 6, lines 11-13 r Pu
= 20X・・・・・・＋390・・・・・・
・・・= 329 WF2 2 390X・・・・・・・・・
・+20・・・・・・・・・= 1,106WPo+=
Pt+ + P21 = L435W
JPo+”” pH 0 P21 = 1,365W
J Correct. (2) "P32 yo 0 (P32 is only the switching loss)" on page 13, line 9 is corrected as follows. (3) Correct r476WJ in the 10th line to [ciOWJ. (4) “0.33 J” in the same line 13 is “0.36
Correct to J. (5) Correct "33%" in line 14 to "36%". (6) Figures 3 and 7 are corrected as shown in the attached sheet. Above Figure 3

Claims (1)

[Claims] (1) In an electromagnetic deflection type display device that has a deflection amplifier and is capable of displaying a part of an arbitrary position on the screen at high resolution when displaying an image in 'rV raster, the deflection amplifier described above is used. There is a linear intensifier for linearly increasing the input signal, and a power output for performing horizontal retrace.During horizontal retrace during raster display, the output of the horizontal retrace power supply is applied to the deflection coil above the screen. A display device comprising a changeover switch.