JPH0638227A - Color picture display device - Google Patents

Abstract

PURPOSE:To decrease number of revolutions of a drive motor, to set a voltage lower and to reduce power consumption by adopting plural sets of R, G, B color filters for a coloring section. CONSTITUTION:Two sets of three color R, G, B filters 17a-17f are adopted for a coloring section 17. Since a color signal outputted from a signal changeover section 5 is switched sequentially corresponding to a vertical synchronizing signal, the coloring section 17 is to be driven in matching therewith. Since the three color filters of one set having been used in a conventional display device are increased for two sets, number of revolutions is halved, the drive voltage is reduced and the power consumption is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monochromatic image display device, and more particularly to a color image display device for displaying a color image by using a color filter on a black and white cathode ray tube.

[0002]

2. Description of the Related Art FIGS. 2A and 2B are a structural view and an explanatory view of a conventional color image display device, in which 1 is a luminance signal Y,
A cathode ray tube display unit (hereinafter abbreviated as CRT) which is a monochrome image display unit which receives a horizontal synchronizing signal H and a vertical synchronizing signal V to display a monochrome image, 2 is red (R), green (G), A colored portion consisting of one set of blue (B) three-color filters 2a to 2c,
Reference numeral 3 is a drive motor for rotating the coloring portion 2, and 4 is a rotation sensor for detecting a rotation phase of the coloring portion 2 and outputting a rotation synchronizing pulse P.

Color signals R, B, and G corresponding to the red, blue, and green filters are input to 5 and one of R, B, and G is selected according to the switching signal S and output to the CRT 1. The signal switching units 11 to 13 respectively input the video signals of the respective color signals, and the video signal storage units for storing the video signals, and 14 and 15 convert the horizontal synchronizing signal H and the vertical synchronizing signal V into signals of triple frequency. A frequency conversion unit 16 for converting is a control unit that receives the vertical synchronization signal V and the rotation synchronization pulse P of the video signal and controls the drive motor 3 and the signal switching unit 4.

Next, the operation of the conventional device having the above structure will be described. The video signal storage units 11 to 13 are synchronized with the input vertical synchronization signal V, and each color signal R for one field,
G and B are stored, the stored signal is read out three times at a triple speed, and the input color signal for one field is repeatedly output three times in one field period. This storage and reading are performed in parallel.

The control unit 16 controls the rotation of the drive motor 3 so that the rotation synchronizing pulse P of the coloring unit 2 maintains a constant phase relationship with the vertical synchronizing signal V. Therefore, the coloring section 2 makes one rotation in one field of the input video signal. Also, the control unit 1
Reference numeral 6 switches the output signal of the signal switching unit 5 in accordance with a signal having a frequency three times as high as the vertical synchronizing signal V from the frequency conversion unit 15, and selects C among the inputs from the video signal storage units 11 to 13.
Control is performed so that a signal corresponding to the color filter on RT1 is output to CRT1.

3 (a) to 3 (d) show a part of the relationship between the rotational phase of the coloring section 2, the scanning line of the CRT 1 and the switching of the signal switching section 5. In the figure, red display and red to green are shown. However, the same applies to the other green and blue colors. In this way, when the coloring unit 2 including the color filters 2a to 2c is rotated and a certain color signal of the video signals is input, the CRT is passed through the filters of the same color.
A black and white image can be made into a color image by viewing the image of No. 1.

[0007]

The conventional color image display device is constructed as described above, and since the color filters 2a to 2c of the coloring portion 2 are constituted by one set, the coloring portion 2 is formed.
The drive motor 3 for rotating the motor must be rotated at V _HZ (V is the frequency of the vertical synchronizing signal), which results in high speed rotation.
There was a problem that the voltage had to be set high.

The present invention has been made in order to solve the above problems, and reduces the number of rotations of the drive motor by using a plurality of R, G, B color filters in the coloring section. An object of the present invention is to obtain a color image display device capable of setting a low voltage (a lower rotation allows more voltage under the same load condition) and reducing power consumption.

[0009]

In the color image display device according to the present invention, the coloring portion for coloring the image of the image display portion is constituted by a plurality of sets of three-color filters.

[0010]

In the present invention, a plurality of colored portions (N pairs) are provided.
When the colored portion is driven in accordance with the change of the color signal that changes sequentially, the driving speed is V
/ N (V is the frequency of the vertical synchronizing signal).

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are a structural view and an explanatory view of a color image display device according to this embodiment, and 17 is R, G,
This is a coloring part provided with two sets of three-color filters B of 17a to 17f, and the other configurations are the same as the conventional one.

Next, the operation will be described. Since the color signals output from the signal switching unit 5 are sequentially switched according to the vertical synchronizing signal, the coloring unit 17 must be rotated accordingly. By the way, since there are now two sets of three-color filters, which is one set in the past, the rotation speed is halved,
The driving voltage can be reduced and the power consumption can also be reduced. If N sets of three-color filters are provided, the rotation speed becomes V / N (V is the frequency of the vertical synchronizing signal).

[0013]

As described above, according to the present invention, since the colored portion is constituted by a plurality of sets of three-color filters, the driving speed thereof can be reduced, the driving voltage is also reduced, and the power consumption is reduced. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram and an explanatory diagram of the device of the present invention.

FIG. 2 is a configuration diagram and an explanatory diagram of a conventional device.

FIG. 3 is a diagram showing a relationship between a rotation phase of a coloring unit, a scanning line of a CRT, and switching of a signal switching unit in a conventional device.

[Description of Reference Signs] 1 monochromatic image display unit 3 drive motor 4 rotation sensor 5 signal switching unit 11 to 13 video signal storage unit 16 control unit 17 coloring unit 17a to 17f three color filter

Claims (1)

[Claims] 1. A monochromatic image display section, a video signal storage section for storing each color signal of an input video signal according to a vertical synchronizing signal, and a plurality of sets of three color filters, and an image of the image display section is displayed. A coloring section for coloring, a driving section for driving the coloring section to sequentially switch the color filters, a signal switching section for switching the output from the video signal storage section and outputting to the image display section, and the above according to the vertical synchronizing signal. A color image display device, comprising: a control unit that controls a drive unit and a signal switching unit to match a color of a color signal with a color filter.