JPS62184492A - 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] [Industrial Application Field] The present invention relates to a display device such as a random scan type display device, a raster scan type display device, and a synchroscope, and particularly to a method for controlling the intensity volume of the display device. The present invention relates to a display device that controls display brightness on a CRT screen.

[Prior Art] FIG. 2 is a block diagram showing a conventional display device. In the figure, (1) is a data processor, (2) is a dynamic focus correction voltage generation circuit that inputs an X deflection signal (Vx) and a Y deflection signal (Vy) from the data processor (1) to correct the focus position; (3) is a focus offset voltage generation circuit for performing static focus correction, and (4) is the dynamic focus correction voltage (VDT) and the focus offset voltage from the focus offset voltage generation circuit (3). (VOF) and an addition circuit (5) inputs the luminance signal (Vz) from the data processor (1),
RT (10) is a video amplifier for amplifying to the brightness side level, (6) is a focus amplifier for amplifying the focus voltage input from the adder circuit (4) to the focus control level of CRT, (7) is a data The X deflection signal (Vx) and Y deflection signal (Vx) input from the processor (1)
Vy), a bottle cushion distortion correction circuit for adding a correction value for correcting the distortion of the image projected on the CRT (10) surface; (8) is this bottle cushion distortion correction circuit (
(9) is a deflection amplifier for amplifying the corrected X deflection signal (V
RT (10) is a deflection coil for generating a magnetic field for changing the trajectory of the electron beam; (10) is a CRT.

The operation of the conventional display device having the above configuration will be explained below with reference to FIG. Among the X deflection signal (Vx), Y deflection signal (Vy), and luminance signal (Vz) output from the data processor (1), the X deflection signal (Vx) is processed in the dynamic focus correction voltage generation circuit (2). Let the dynamic -7 orcus voltage be VDF=Kl(Vx"+Vy"). Furthermore, the adder circuit (4) is connected to the focus/offset voltage generating circuit (3).
) is added to the offset voltage (VOF) from VMX
= K2・VOF+Kl(Vx2+Vy2) is amplified by the focus amplifier (6), and VF=M(・K2
・VOF+Kl(Vx"+Vy")). Here, the above-mentioned 1, K2, and M are each constants.

On the other hand, the X deflection signal (Vx) from the data processor (1)
is also input to the bottle cushion distortion correction circuit (7), and the corrected X deflection signal VCX=Vx −K Vx(Vx”+
Vy") and corrected Y deflection signal VCY=Vy-K
Vy(Vx2+Vy2). In addition, the deflection amplifier (8
), the X deflection signal VCX is converted to the X deflection current ICX, and the Y deflection signal CY is converted to the Y deflection current ICY.
)) and IC'/=m(Vy KVy(Vx2+V
y'')) is input to the deflection coil (9), and the CRT (10
) is subjected to a displacement proportional to the X deflection current (ICX) and Y deflection current (ICY), and the CRT (10
) above position. Also, the luminance signal (Vz) output from the data processor (1) is converted to C by the video amplifier (5).
The voltage VOZ = LVZ, which is amplified to a voltage sufficient to control the amount of electron beam of RT (10), is applied to the CRT.
(10) is output. Note that in the above description, L and M are constants.

[Problems to be solved by the invention] Since the conventional display device is configured as described above, C
Correction of focus deviation due to RT brightness is done by adding an offset value to the focus voltage using a manual volume, and it is possible to adjust the focus from the minimum brightness where it is barely visible to the maximum brightness where it shines brightly. This is unreasonable, and there are problems such as focusing only on the brightness that is most commonly used, but not eliminating focus blurring. This invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a display device that can automatically focus from the minimum brightness to the maximum brightness on a CRT. .

[Means for Solving the Problems] The display device according to the present invention includes a focus displacement correction voltage circuit, and adjusts the position on the CRT and the unit so as to minimize the spot diameter of the electron beam hitting the phosphor on the CRT. The amount of beam movement per hour.

The focus voltage is automatically controlled from the brightness control voltage of the CRT.

[Function] The display device according to the present invention calculates the focus voltage from the brightness position on the CRT, the amount of movement of the beam per unit time, and the brightness control voltage of the CRT as a method of controlling the focus voltage, so that no defocus occurs. .

[Example] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 2, (1) is a data processor that generates the X deflection signal (Vx), Y deflection signal (Vy), and brightness signal (Vz), and (2) is the focus based on the position of the electron beam on the CRT (10). (3) is a dynamic focus correction voltage generation circuit that generates a correction voltage (VD);
an offset voltage generation circuit; (4) an addition circuit for adding the focus displacement voltage (V c ) and an offset voltage (VOF); (5) a video amplifier that amplifies the luminance signal (Vz) with the optimum voltage of the CRT; (6) is a focus amplifier that amplifies the focus voltage (VMX) to the optimum voltage for the CRT (10); (7) is the CRT; (10) is a bin cushion distortion correction circuit for correcting distortion of the image on the screen;
8) is a deflection amplifier that amplifies the deflection signals (VCX, VCY) to the specified position on the CRT (10), (9) is the deflection coil, (10) is the CRT, and (11) is the dynamic focus voltage (VDF). ), a brightness signal (Vz), an X-deflection signal (Vx), and an X-deflection signal (Vy) to calculate the amount of displacement of the focus voltage.

Next, the operation will be explained with reference to FIG. X deflection signal (Vx) output from data processor (1)
and the X deflection signal (Vy) and the luminance signal (Vz),
The X deflection signal (Vx) and the X deflection signal (Vy) are generated by the dynamic focus correction voltage generation circuit (2) to generate the dynamic focus voltage VDF=K, (Vx2+Vy2)
and is input to the focus displacement correction voltage generation circuit (11). In the focus displacement correction voltage generation circuit (11),
From the brightness signal Vz, dynamic focus voltage VDF, X deflection signal (Vx), and X deflection signal (Vy), a correction voltage, that is, focus displacement voltage Vc=2VDF+
3Vz+4(AR/Δt) is calculated. Here, Δ
R=v'ΔVx"+Δv y2, K1°K2, K
3. K4 is a constant. Since the focus displacement voltage Vc output in this way is applied with a pedestal, the focus displacement voltage Vc is
Offset voltage V from offset voltage generation circuit (3)
It is added to OF, vMx = 5, VOF + 6, vc, and amplified by Nifocus amplifier (6), VF = M (K
Input to CRT (10) as 5.VOF+ and 6.vc). On the other hand, Vx and Vy as deflection signals are input to the bin cushion distortion correction circuit (7), and the X deflection signal VCX
: VX −K VX (VX”+Vy”), Y deflection signal Vcy=Vy −K Vy (Vx”+Vy2).

Furthermore, the X-side deflection current I cx=m (Vx −K Vx(Vx2+Vy”) suitable for driving the deflection coil (9) in the deflection amplifier (8)
)) and Y-side deflection current I cy= m (Vy K V
y (Vx"+Vy2)) to drive the deflection coil (9) and control the position on the CRT (10). Also, the brightness signal (Vz) is transmitted to the CRT (10) by the video amplifier (5).
After amplifying the voltage to a voltage sufficient to control the amount of the electron beam (10), it is input to the CRT (10). In addition, K5
, K6,M, where m is a constant.

[Effects of the Invention] As described above, according to the present invention, the X and Y coordinate positions and the beam movement speed are adjusted so that the focus of characters and waveforms displayed on a CRT does not change depending on the brightness and is always optimal. Since the configuration is configured to calculate from the brightness voltage, the minimum brightness (
This has the effect of providing an optimal display device that is in focus from the brightest (almost invisible state) to the maximum brightness (glaring state).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a display device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional display device. In the figure, (1) is a data processor, (2) is a dynamic focus correction voltage generation circuit, (3) is a focus/offset voltage generation circuit, (4) is an addition circuit, and (5) is a data processor.
) is the video amplifier, (6) is the focus amplifier, (7
) is the bottle cushion distortion correction circuit, (8) is the deflection amplifier,
(9) is a deflection coil, (10) is a CRT, and (11) is a focus displacement correction voltage generation circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a display device that controls the display brightness of characters, waveforms, etc. on a CRT screen based on the X deflection signal, Y deflection signal, and brightness signal generated from a data processor, the focus position is corrected by inputting the X deflection signal and Y deflection signal. and a dynamic focus correction voltage generation circuit that generates a focus correction voltage, the focus correction voltage, the luminance signal, and the
The amount of displacement of the focus voltage is calculated based on the X and Y coordinate positions based on the deflection signal and the Y deflection signal, the moving speed of the beam, and the brightness voltage that controls the amount of electron beam per unit time, and the focus displacement voltage is calculated. Adding the generated focus correction voltage generation circuit, the focus displacement voltage mentioned above, and the offset voltage for providing the pedestal voltage,
The above-mentioned apparatus includes an addition circuit that outputs a focus voltage, and a pincushion distortion correction circuit that corrects distortion of an image on the CRT screen based on the X-deflection signal and the Y-deflection signal and outputs X- and Y-side deflection currents. A display device characterized in that the spot diameter of an electron beam hitting a phosphor on a CRT screen is automatically controlled to always be the minimum diameter regardless of the amount of electron beam per unit time.