JPH0322777Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a display device using a stroke scan method, and particularly to improvement of a displayed image by adjusting the delay time of a luminance signal.

[Conventional technology]

FIG. 6 is a diagram showing the configuration of a conventional display device using the stroke scan method. In the figure, 1 indicates a signal for displaying using the stroke scan method in response to a display command signal SI, which is the content to be displayed on the display device. A display signal generation section that generates SX0, SY0, and SZ0; 2 and 3 are deflection amplifiers that amplify the deflection signals SX0 and SY0 output from the display signal generation section 1; and 7 is a luminance output from the display signal generation section 1. Delay circuit 4 that delays signal SZ0
8 is a display unit that receives output signals SX1, SY1, and SZ4 of the deflection amplifiers 2 and 3 and the brightness amplifier 7 and displays an image.

A display device using the conventional stroke scan method is configured as described above. For example, when displaying a line segment AB as shown in FIG. It is given to the display signal generator 1 as SI. The display signal generator 1 then displays the line segment AB.
Deflection signal SX0, deflection signal depending on the position and length of
Generates SY0 and brightness signal SZ0. In order to display the above signals on the display section 8, the deflection amplifiers 2 and 3
The brightness amplifier 7 amplifies the signal, and the display section 8 displays it.

Here, the brightness signal SZ0 is an ON/OFF signal for blinking the bright spot on the display screen of the display unit 8, and does not control the brightness gradation.
The bright spot is made to shine only while moving from point B to point B, and is turned off at other times, as shown in Figure 2 d.
It's a signal like this. Deflection signal SX0, SY0
is a signal that controls the bright spot, the deflection signal SX0 is the X direction on the display screen of the display unit 8, and the deflection signal SY0 is the Y direction.
The direction is controlled as shown in Fig. 2 b and c. As described above, the bright spot is moved using the deflection signals SX0 and SY0, but in order to keep the brightness of line segment AB constant on the display screen, the bright spot must be moved from point A to point B at a constant speed. Yes, the faster the bright spot moves, the darker it becomes, and the slower it moves, the brighter it becomes.

Considering the characteristics of the deflection amplifiers 2 and 3, the input and output signals of the deflection amplifiers are as shown in FIG. 3e. On the other hand, since the input/output signals of the brightness amplifier have less delay than the delay of the deflection amplifier, a delay circuit 4 is used before the brightness amplifier 7 to synchronize the timing in the display section 8. The display is performed by adjusting the timing with SZ4.

[Problem that the invention attempts to solve]

In the conventional display device as described above, depending on the characteristics of the deflection amplifiers 2 and 3, the delay time of the rising edge, which is the beginning of writing a line segment, and the delay time of the falling edge, which is the end of writing, are different. Here, inputs SX1 and SZ4 of the deflection signal and luminance signal Z to the display section 8 are as shown in e and f of FIG. 3. In the figure, the rising delay time with respect to the luminance signal SZ0 output from the display signal generating section 1 is assumed to be t ₁ and the falling delay time is t ₂ . Since the delay time of the rise and fall of the output signal SZ1 of the delay circuit 4 is the same, t ₁ = t ₂ in FIG. There was a problem in that the deflection signals SX1, SY1 and the brightness signal SZ4 did not match, resulting in uneven brightness at the beginning and end of writing.

This invention was made to solve this problem, and the purpose is to prevent uneven brightness that may occur particularly at the start and end points when displaying the line segment AB.

[Means for solving problems]

The display device according to this invention is a deflection signal generated after the output of a deflection amplifier, corresponding to an input signal.
In order to synchronize the luminance signal SZ4 output from the luminance amplifier with the delays of SX1 and SY1, a delay circuit is provided that can individually and arbitrarily adjust the delay of the luminance signal SZ0 at the rise and fall times.

[Effect]

In this invention, by improving the delay circuit of the luminance signal SZ0, it is possible to arbitrarily adjust the delay of the luminance signal SZ1 with respect to the rising and falling edges of the signal, and the luminance signal SZ4 can be used as a deflection signal.
By synchronizing with SX1 and SY1, uneven brightness of the displayed image is prevented.

〔Example〕

FIG. 1 is a diagram showing an embodiment of this invention.
1 to 4 and 7 to 8 are completely the same as the conventional device described above. 5 is a delay circuit connected in parallel to the conventional delay circuit 4, and 6 is an OR circuit in a logic circuit that combines the signals of the delay circuits 4 and 5. Here, the delay circuits 4 and 5 use shift registers shown in FIG.

In the display device configured as described above, when a new delay circuit is added in parallel to the conventional delay circuit, the input signal SZ0 to each delay circuit 4, 5 becomes h in FIG. 5, and the output signal SZ1, SZ2 becomes h in FIG. It will look like i and j in Figure 5. Here, the delay time of the output signal of the delay circuit with respect to the input signal is, for example, 4th.
Adjustment is made by arbitrarily selecting the output terminal of the shift register shown in the figure. Then, the output signals SZ1 and SZ2 of the delay circuits 4 and 5 of FIG. 1 are outputted by the OR circuit 6 of FIG.
A logical OR is performed on i and j in FIG. 5, and a signal k in FIG. 5 is output. In this way, by arbitrarily selecting the output terminal of the shift register and selecting the delay time for the rise and fall of the luminance signal Z, the input signal of the display section 8 of FIG. 3e in which the deflection signals X and Y are delayed can be obtained. Brightness signal SZ4 synchronized with SX1 and SY1
The brightness signal SZ4 shown in FIG. 3g can be input to the display unit 8, and an output image without uneven brightness can be obtained.

Incidentally, in the above description, a shift register of a logic circuit is used to generate the delayed signal of the luminance signal SZ0, but the same effect can be achieved by using other logic circuits or analog circuits.

[Effect of idea]

As explained above, this idea makes it possible to adjust the delay time of the luminance signal SZ4 separately for the rise and fall by having another delay circuit in parallel with the conventional delay circuit for the luminance signal SZ0. This has the effect of suppressing brightness unevenness in a displayed image.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of this invention, Figure 2 is a diagram showing the relationship between a display image, deflection signals X, Y, and brightness signal Z, and Figure 3 is a diagram showing the input/output signals of the deflection amplifier and the brightness 4 is a diagram showing an example of a delay circuit, FIG. 5 is a diagram for explaining the operation of the embodiment, and FIG. 6 is a diagram showing a conventional display device. In the figure, 1 is a display signal generation section, 2 and 3 are deflection amplifiers, 4 and 5 are delay circuits, 6 is an OR circuit, 7 is a brightness amplifier, and 8 is a display section. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a display signal generation section that generates a signal for display using the stroke scan method; a deflection amplifier that amplifies the deflection signal generated from the display signal generation section;
A delay circuit that individually and arbitrarily adjusts the delay of the luminance signal at rising and falling times, a luminance amplifier that amplifies the luminance signal, and a display section that receives the outputs of the deflection amplifier and luminance amplifier and displays an image. equipped display device.