JPH1013853A - Rgb video image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend an upper limit of a color slurring correction amount for a video display. SOLUTION: An RGB correction data generating circuit 30 generate red(R), green(G), blue(B) correction data c1R, c1G, c1B based on a control signal b1 from a correction data control section 12 and gives them to an RGB data selection circuit 13. The RGB data selection circuit section 13 uses an RGB timing signal d1 described below to select each of the correction data c1R, c1G, c1B one by one and gives the selected data to an RGB video image correction circuit 20 sequentially. The RGB video image correction circuit 20 applies A/D conversion to the video signal a1 and the RGB video signal data are stored in an image memory and the video data are read out of the image memory in the timing of correction data selected by the RGB data selection circuit 13 and the read data are D/A-converted to correct color slurring and the resulting video signal e1 is led to an output terminal 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RGB image display device for displaying red, green and blue image signals on a display screen.

[0002]

2. Description of the Related Art In recent years, color television receivers have been increased in size and displayed on a wide screen. Typically,
In a color television receiver, a cathode ray tube display (hereinafter, referred to as a CRT display) is used as an image display device.

In such a CRT display, the color misregistration of red (R), green (G), and blue (B) is corrected by convergence adjustment and color purity adjustment. These corrections are added to the electron beam. Since the magnetic field is adjusted by adjusting the neck portion of the CRT, as the display screen becomes larger and wider, the correction of the color shift in the vicinity of the peripheral portion of the display screen where particularly large color shift needs to be corrected is required. Had become difficult.

[0004]

The above-mentioned conventional CRT
In the display, red, green, and blue color shifts are corrected by convergence adjustment and color purity adjustment, but these corrections are performed by adjusting the magnetic field applied to the electron beam at the neck of the CRT. As display screens have become larger and wider, it has become difficult to correct color shifts in the vicinity of the periphery of the screen where correction of particularly large color shifts is required on the display screen.

[0005] The present invention eliminates the above-mentioned problems and expands the upper limit of the amount of correction for color shift in video display.
It is an object to provide a video display device.

[0006]

Means for Solving the Problems Claim 1 according to the present invention.
The RGB image display device described is an RGB image display device that displays red, green, and blue video signals on a display screen.
An RGB correction data generation circuit that generates red, green, and blue correction data for individually correcting display timings of the red, green, and blue video signals; and an R, G, and B correction circuit based on the correction data from the RGB correction data generation circuit. And an RGB video correction circuit for correcting green and blue video signals.

According to a second aspect of the present invention, there is provided an RGB image display device for displaying red, green, and blue image signals on a display screen, wherein the red, green, and blue image signals are displayed. An RGB correction data generation circuit that generates red, green, and blue read clock signals corresponding to the display timings in a state in which delay correction can be individually performed; and the red, green, and blue video signals are recorded. By reading the green and blue video signals based on the red, green and blue read clock signals from the RGB correction data generation circuit, respectively,
R for individually correcting display timing of green and blue video signals
And a GB image correction circuit.

According to the first and second aspects of the present invention, the RGB video correction circuit corrects the display timing of the red, green, and blue video signals individually, and the correction amount in this case is the display timing. , It is possible to correct a larger color shift in video display.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an RGB video display device according to the present invention, which is applied to an RGB video display device of RGB progressive scanning display.

Referring to FIG. 1, an embodiment of the present invention is an RGB video display device for displaying video signals of red (R), green (G), and blue (B) on a display screen. Green,
Red, which individually corrects the display timing of the blue video signal,
Green and blue correction data (hereinafter referred to as RGB correction data)
An RGB correction data generating circuit 30 for generating c1R, c1G, and c1B, and an RGB image for correcting the red, green, and blue video signals based on the RGB correction data c1R, c1G, and c1B from the RGB correction data generating circuit 30. And a correction circuit 20.

Hereinafter, embodiments of the present invention will be described in detail.

Reference numeral 11 denotes an input terminal to which a video signal a1 selected for reception and converted for RGB progressive scan display is led, and the video signal a1 led to this input terminal is supplied to an RGB video correction circuit 20. .

On the other hand, the correction data control circuit 12
Creates a control signal b1 for controlling the RGB correction and
It is supplied to the GB correction data generation circuit 30. The RGB correction data generating circuit 30 generates red (R), green (G), and blue (B) correction data c1R, c1G, and c1B based on the control signal b1 from the correction data control unit 12, and generates an RGB data selection circuit. 13. The RGB data selection circuit unit 13 selects the RGB correction data c1R, c1G, and c1B one by one according to an RGB timing signal d1 described later and sequentially supplies the RGB correction data c1R, c1G, and c1B to the RGB video correction circuit 20.

The RGB video correction circuit 20 generates a video signal a1
Performs analog / digital conversion (hereinafter referred to as A / D conversion) on the image data, stores RGB video signal data in the image memory, and outputs video data from the image memory at the timing of the correction data selected by the RGB data selection circuit 13. Read data and convert it to digital / analog (hereinafter referred to as D / A conversion)
Is performed to correct the color misregistration and lead to the output terminal 15 as the video signal e1.

The video signal e1 guided to the output terminal 15 is displayed on a cathode ray tube display (hereinafter, referred to as a CRT display) by a video signal display circuit at a subsequent stage.

FIG. 2 shows the RGB correction data generating circuit 3 of FIG.
It is a block diagram which shows the principal part of 0.

In FIG. 2, the RGB correction data generation circuit 30 is composed of three blocks of RGB. The R write data f1R, the R write clock g1R, and the R read clock h1R are supplied to the R data memory 31 of the R block. G data memory 3 of G block
2, G write data f1G, G write clock g1
A G, G read clock h1G is supplied. In the B data memory 33 of the B block, the B write data f1B, B
A write clock g1B and a B read clock h1B are supplied.

These RGB write data f1R, f1
G, f1B, RGB write clocks g1R, g1G, g
1B, RGB read clocks h1R, h1G, h1B
Is set based on the control signal b1 from the correction data control unit 12 in FIG.

The RGB data memories 31, 32, 33
RGB write clocks g1R, g1G, g1B respectively
Respectively, so that the RGB write data f1R, f1G, f
1B, and the RGB read clock h1 respectively.
The data written by R, h1G, and h1B are read, and these RGB read data are read by RGB, respectively.
RGB of FIG. 1 as correction data c1R, c1G, c1B.
The data is guided to the data selection circuit 13.

FIG. 3 is a block diagram showing the main parts of the RGB data selection circuit 13 and the RGB image correction circuit 20 of FIG.

The RGB data selection circuit 13 uses the RGB timing signals d1R, d1G, d1B (the RGB timing signal d1 in FIG. 1) to output the RGB correction data c1R, c1.
G and c1B are selected one by one and sequentially supplied to the image memory 21 of the RGB video correction circuit 20 as a read clock c1.

The image memory 21 converts the video signal a1 into an A / D signal.
Write the converted input RGB video data i1 and write clock j
1 and read out the RGB video data at the timing of the correction data from the RGB data selection circuit 13 and outputs the RGB data.
It is supplied to the subsequent D / A conversion circuit as B video data k1.

FIG. 4 is a timing chart showing the basic operation of the RGB video display device shown in FIGS. 1 to 3, and FIG. 4A shows a horizontal synchronizing signal extracted from the video signal a1 in FIG. 4 (b) shows the input RGB video data i1 of FIG. 3 converted to analog, and FIG.
4D shows the G timing signal d1G of FIG. 3, and FIG. 4E shows the B timing signal d1B of FIG.

The video signal a1 according to the embodiment of the present invention is represented by R
Since it is converted for the GB progressive scanning display, the video signal a1
The horizontal period H1 of the horizontal synchronizing signal shown in FIG. 4A extracted from FIG. 4A is 1/3 of the horizontal period H0 for simultaneous display of RGB. The input RGB video data i1 shown in FIG.
Is synchronized with the horizontal synchronizing signal shown in FIG. 4 (a), and the video data for simultaneous display of RGB is time-divided for each horizontal line in the order of R → G → B → R and superimposed on one signal. Become.
The RGB timing signals d1R, d1G, and d1B shown in FIG. 4C, FIG. 4D, and FIG.
It becomes high level (H) during the period when the input RGB video data i1 shown in (b) becomes RGB video data, and becomes low level (L) during other periods. The RGB data selection circuit 13 shown in FIG.
RGB timing signals d1R, d1G, d shown in (e).
When 1B becomes high level (H), respectively, the RGB correction data c1R, c1G, and c1B are selected and sequentially supplied to the image memory 21 of the RGB video correction circuit 20. For this reason, the RGB video correction circuit 20 uses the input RGB
The RGB video data of the video data i1 is
The correction is performed using the correction data c1R, c1G, and c1B.

The theory of correction by the RGB image display device will be described below with reference to FIGS.

FIG. 5 is an explanatory diagram for explaining image display by the RGB image display apparatus of FIG. 1 in the case where there is no color shift by default. FIG. FIG. 5B shows the display timing of a predetermined pixel of G with respect to a display position where there is no color shift, FIG. 5C shows the display timing of a predetermined pixel of B with respect to a display position where there is no color shift, and FIG. Indicates a display position of a predetermined pixel of RGB.

As shown in FIG. 5, when there is no color misregistration by default, FIGS. 5 (a), 5 (b), and 5 (c)
As shown in (1), all the display timings T1 of the predetermined pixels of RGB with respect to the display position without color shift coincide. In this case, the horizontal position of the video display is at the same position without displacement as shown in FIG.

FIGS. 6A and 6B are explanatory diagrams for explaining a case where color misregistration occurs and a case where the color misregistration is corrected by the RGB image display device of FIG. 1, and FIG. 6A shows a case where color misregistration occurs. 6B shows the display timing of a predetermined pixel of R with respect to a display position where no color shift occurs, and FIG. 6B shows the display timing of a predetermined pixel of G with respect to a display position without color shift when a color shift occurs. FIG. 6D shows the display timing of a predetermined pixel of B with respect to a display position where no color shift occurs when color shift occurs, FIG. 6D shows R correction data c1R for correcting color shift, and FIG. G correction data c1G for correction, and FIG. 6F shows B for correcting color misregistration.
FIG. 6 (g) shows the display position of a predetermined RGB pixel when color misregistration occurs, and FIG. 6 (h) shows the display position of a predetermined RGB pixel when color misregistration is corrected. I have.

As shown in FIGS. 6 (a), 6 (b) and 6 (c), when a color misregistration occurs in G, the display timing of predetermined RGB pixels with respect to a display position without color misregistration. Does not match only G, the timing of the period D2 is delayed, and the RB display timings match. In this case, the horizontal position of the image display is shifted to the right in the horizontal direction without matching only G, as shown in FIG. In order to correct such color misregistration, the RGB correction data c1R, c1G, and c1B are used as shown in FIGS.
(E), as shown in FIG. 6 (f), the timing of the clock of the RB is delayed from the G by the period D2. As a result, the color shift can be corrected, and the RB can be shifted rightward in the horizontal direction to match G, as shown in FIG.

As described above, the RGB image display apparatus delays the correction data of the remaining colors by the difference between the display timings of the colors most delayed from the display position where no color shift occurs and the remaining colors. The displacement can be corrected.

The details of such timing control will be described below with reference to FIGS.

FIG. 7 is an explanatory diagram showing control by the RGB image display device of FIG. 1. FIG. 7 (a) is a basic display clock which is the basis of a display operation, and FIG.
7C shows a video signal of a predetermined pixel of G having no color shift, and FIG. 7D shows a video signal of a predetermined pixel of B having no color shift. 7E is R correction data c1R for correcting a color shift, and FIG.
G correction data c1G for correcting color misregistration, FIG.
(G) shows B correction data c1B for correcting a color shift.

The numerical value of the basic display clock shown in FIG. 7A indicates the time from the end of the horizontal synchronization period, and is shown in FIGS. 7B, 7C and 7D. RGB shown
The video signal of the predetermined pixel has no shift and is displayed from the fifth clock to the sixth clock. However, when the color misregistration shown in FIGS. 6A, 6B, and 6C occurs due to the deflection operation, the color misregistration shown in FIGS.
(E), the RGB correction data c1R, c1G, and c1B shown in FIGS. 7F and 7G delay the display timing of a predetermined pixel of RB by one clock with respect to G. Thereby, the color shift can be corrected.

FIG. 8 shows such RGB correction data c1.
R, c1G, and c1B are represented as 1/0 data values.

The G correction data c1G is "1" from the fifth clock to the sixth clock, and "0" for the other clocks. The RB correction data c1R and c1B are
The sixth to seventh clocks are "1", and the other clocks are "0".

According to such an embodiment of the invention, R
The RGB image correction circuit 20 is an RGB correction data generation circuit 30
The display timings of the red, green, and blue video signals are individually corrected by the RGB correction data c1R, c1G, and c1B. Since the correction amount in this case is determined by the delay amount of the display timing, the color shift of the video display , The upper limit of the correction amount can be increased, and thereby the display screen can be made large and wide.

Although the embodiment of the invention shown in FIGS. 1 to 8 has been applied to the RGB video display device of the RGB progressive scan display, it may be applied to the RGB video display device of the RGB simultaneous scan display.

[0039]

According to the present invention, it is possible to increase the upper limit of the correction amount of the color shift of the image display. As a result, the display screen can be made larger and wider.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an RGB video display device according to the present invention.

FIG. 2 is a block diagram showing a main part of an RGB correction data generation circuit of FIG. 1;

FIG. 3 is a block diagram showing a main part of an RGB data selection circuit and an RGB image correction circuit of FIG. 1;

FIG. 4 is a timing chart showing a basic operation of the RGB video display device shown in FIGS. 1 to 3;

FIG. 5 is an explanatory diagram illustrating image display by the RGB image display device of FIG. 1 when there is no color misregistration by default.

FIG. 6 is an explanatory diagram illustrating image display by the RGB image display device of FIG. 1 when a color shift occurs and when the color shift is corrected.

FIG. 7 is an explanatory diagram showing control by the RGB video display device in FIG. 1;

8 is an explanatory diagram showing the RGB correction data of FIG. 7 as 1/0 data values.

[Description of Signs] 12 correction data control circuit 13 RGB data selection circuit 20 RGB video correction circuit 30 RGB correction data generation circuit

Claims (2)

[Claims] 1. An RGB image display device for displaying red, green, and blue video signals on a display screen, wherein the red, green, and blue video signals are individually corrected for display timing. An RGB correction data generation circuit that generates the correction data of the above, and an RGB video correction circuit that corrects the red, green, and blue video signals based on the correction data from the RGB correction data generation circuit. RGB video display device. 2. An RGB video display device for displaying a red, green, and blue video signal on a display screen, wherein red, green, and blue readout corresponding to display timings of the red, green, and blue video signals. An RGB correction data generation circuit for generating clock signals individually in a state capable of delay correction; and recording the red, green, and blue video signals, and recording the recorded red, green, and red video signals.
An RGB image for reading out the blue video signal based on the red, green, and blue read clock signals from the RGB correction data generation circuit, and individually correcting the display timing of the red, green, and blue video signals. An RGB image display device, comprising: a correction circuit.