JP3536398B2 - CRT display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT display device useful when applied to a CRT display device having a screen aspect ratio of 16: 9.

[0002]

2. Description of the Related Art In recent years, for example, a CRT display device used in a television receiver or the like has a screen aspect ratio of 4: 3 in addition to the conventional 4: 3 CRT display device as the screen becomes wider. 16: 9 CRT display devices have become popular. A television receiver equipped with such a CRT display device having an aspect ratio of 16: 9 can view a conventional NTSC system image having an aspect ratio of 4: 3 in several kinds of picture modes. ing.

For this reason, as a picture mode, for example, the horizontal length of a 16: 9 screen and the horizontal length of a 4: 3 image are set to be the same, and a vertically projected image is trimmed and zoomed. There is a mode, and further, a wide zoom mode and the like for compressing the upper and lower parts of the screen to reproduce the image that appears in the vertical direction of the screen in this zoom mode are installed.

FIG. 6 shows an example of a block diagram of a CRT display device mounted on a television receiver or the like and having an aspect ratio of 16: 9 as described above. In this figure, reference numeral 11 denotes a sync separation circuit, which is, for example, a composite video sync signal (CVBS) to a vertical sync signal (V.SYNC) supplied from a preceding circuit of a television receiver (not shown).
And a horizontal synchronizing signal (H.SYNC) are separated and output. Reference numeral 12 is a countdown processor including a counter, which is normally reset by a vertical synchronizing signal and counts horizontal synchronizing signals. For example, a vertical synchronizing signal (V.SYN) output from the sync separation circuit 11 is used.
Even if C) is missing, the vertical screen position information S that is reset at a predetermined vertical synchronization cycle is generated and output.

Reference numeral 13 is a vertical deflection waveform generator, which outputs a vertical deflection waveform signal (VSAW) which is adjusted in accordance with the vertical screen position information S supplied from the countdown processor 12. Has been done. Reference numeral 14 denotes a horizontal deflection correction waveform generator, which outputs a horizontal deflection correction waveform signal (E / W) for adjusting the horizontal deflection waveform signal based on the vertical screen position information S supplied from the countdown processor 12. It is done like this. Reference numeral 15 denotes a control circuit including, for example, a microcomputer, which outputs a predetermined control signal for controlling parameters of each unit described later to the vertical deflection waveform generator 13 and the horizontal deflection correction waveform generator 1.
It is designed to be supplied to four.

The operation of the CRT display device shown in FIG. 6 will be described below with reference to the output waveforms of the respective parts shown in FIGS. The sync separation circuit 11 converts the video sync signal (CVBS) supplied from a pre-stage circuit (not shown) into a vertical sync signal (V.SY).
NC) and a horizontal synchronizing signal (H.SYNC) are separated and supplied to the countdown processor 12. The countdown processor 12 generates vertical screen position information S according to the cycle of the vertical synchronization signal (V.SYNC) as shown in FIG. 7 by the vertical synchronization signal (V.SYNC) and the horizontal synchronization signal (H.SYNC). It is designed to be output. Note that the position information S of the vertical screen is the vertical synchronization signal (V.SYN
During the period of C), it can be expressed by s = KT. (However, K is a coefficient and T is time.)

Further, even when the countdown processor 12 cannot detect the vertical synchronizing signal (V.SYNC), it can generate a signal corresponding to the vertical synchronizing signal (V.SYNC). ing.

The position information S of the vertical screen is obtained by using the vertical deflection waveform generator 13 and the horizontal deflection correction waveform generator 14.
Is supplied to. The vertical deflection waveform generator 13 outputs a vertical deflection waveform signal (VSAW) as shown in FIG. 8, for example, which is adjusted by the following function with respect to the instantaneous value s of the vertical screen position information S. VSAW: v (s) = B (Cs ³ + Ds ² + s) + A (1) where A: Parameter for adjusting vertical screen position B: Parameter for adjusting vertical screen size C, D: Adjusting vertical linearity It is a parameter.

That is, if the values of the parameters "A" to "D" are C = D = 0 and B = 1, v (s) = s + A
Therefore, the screen is vertically scrolled by the parameter "A". In addition, it becomes possible to display the zoom mode described above by the value of the parameter "B",
The linearity of the display screen is corrected by the parameters "C", "D", and "B".

Further, in the horizontal deflection correction waveform generator 14, the horizontal value as shown in FIG. 9 is adjusted, for example, by the function equation (2) shown below with respect to the instantaneous value s of the position information S of the vertical screen. A deflection correction waveform signal (E / W) (a signal for correcting the horizontal deflection waveform signal) is output, and this signal (usually a parabolic waveform) forms a horizontal deflection waveform signal with corrected linearity. It E / W: u (s) = F (Gs ⁴ + s ² + Hs) + E (2) where E: parameter for adjusting horizontal screen size F: parameter for correcting horizontal pin distortion G: horizontal corner pin distortion Parameter H to be corrected: A parameter to correct horizontal trapezoidal distortion.

Then, the vertical deflection waveform signal (VSAW) and the horizontal deflection correction waveform signal (E / W) are input to an output drive circuit at a subsequent stage (not shown) and the horizontal and linearity and position of the screen are corrected. And the image is controlled as a vertical deflection current.

[0012]

By the way, as described above, the horizontal deflection correction waveform signal (E / W) output from the conventional horizontal deflection correction waveform generator 14 is the horizontal pin at the vertical position of the screen. In order to correct the distortion of the cushion and the like, the position information S of the vertical screen is calculated by the functional expression (2) and output.

However, the above functional expression (2) is
Like the functional expression (1) in which the vertical deflection waveform generator 13 adjusts and outputs the vertical deflection waveform signal (VSAW), it is a time function of the position information S of the vertical screen.

Therefore, the correction waveform signal for horizontal deflection (E / W)
Is the vertical deflection waveform signal (VSAW) in the function formula (1) for setting the display screen in the zoom mode or scrolling.
However, even if it is corrected, it is not possible to correct the distortion corresponding to the display screen, resulting in a waveform in which the correction accuracy of the horizontal pincushion distortion deteriorates due to the error of the vertical linearity distortion. There is.

For example, when displaying an image in the wide zoom mode, the parameters "B" and "C", "D" of the functional equation (1) of the vertical deflection waveform generator 13 are controlled by the control signal supplied from the control circuit 15. Is adjusted to adjust the vertical screen size, and by intentionally making the vertical linearity non-linear, the image is compressed and displayed on the screen.

In such a case, the vertical deflection waveform signal (VS
Distortion occurs in the horizontal pincushion due to the non-linearization of the vertical linearity of (AW). Therefore, each time, the functional expression (2) is obtained by the control signal supplied from the control circuit 15.
It was necessary to readjust the values of the correction parameters “E” to “H” in order to correct the distortion of the horizontal pincushion.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, a sync separation means for outputting the separated horizontal / vertical synchronizing signals from the video synchronizing signal, the vertical Based on the result of counting the horizontal synchronizing signal for each period of the synchronizing signal,
A waveform generating means for generating a vertical screen position information S that response,
The above video signal is displayed on the screen as a video with a predetermined aspect ratio.
And control means for outputting a control signal corresponding to a plurality of display modes for displaying,-out based on the vertical screen position information S generated by the waveform control means, is output from the control means
At least the vertical screen size set by the above control signal.
And a first parameter group related to vertical linearity.
In addition to outputting the vertical deflection waveform signal calculated and adjusted by the first relational expression , the vertical screen size and the vertical linear
Conversion equation including the first parameter group for adjusting the priority
Position in the vertical direction by converting the vertical screen position information S by
A vertical waveform generator you output correction waveform information W corresponding to location,-out based on the correction waveform information W output from said vertical waveform means, at least a horizontal screen size, horizontal pincushion distortion
And a second parameter group including horizontal trapezoidal distortion
It is calculated by the relational expression 2 and corresponds to the corrected waveform information W.
To correct the horizontal deflection waveform signal at the vertical position
And a horizontal deflection correction waveform generating means for outputting a horizontal deflection correction waveform signal.

Further, as the first parameter group, vertical
An instantaneous value v of the vertical deflection waveform signal V output from the vertical waveform generating means , further including a parameter relating to the screen position.
(S) is the first relation based on the position information S of the vertical screen.
Is an expression, v (s) = B (Cs ³ + Ds ² + s) + A,
(However, A, B, C, D are correction parameters), and the above conversion formula further corrects the correction parameters.
And the instantaneous value w of the correction waveform information W is the above conversion formula for the position information S of the vertical screen , w (s) = PB
(Cs ³ + Ds ² + s), where P is a correction parameter.

Further, water is used as the second parameter group.
Further comprising a parameter related to the flat corner pincushion distortion, the instantaneous value u of the signal U of the correction of the horizontal deflection signal outputted from the horizontal deflection correcting waveform generating means (w), based on the correction waveform information W, the second It is a relational expression, u (w) = F (Gw ⁴ +
w ² + Hw) + E, where E, F, G and H are constants.

[0020]

According to the present invention, the correction waveform information in which the error of the vertical linearity distortion is added is generated by calculation, and the correction waveform signal for horizontal deflection is generated from this correction waveform information. It is possible to output a correction waveform signal (E / W) for horizontal deflection with high correction accuracy.

In particular, since the horizontal pincushion distortion that occurs when the vertical screen size is adjusted and the vertical linearity is adjusted or corrected to be non-linear, the horizontal pincushion distortion that is required is corrected each time. There is no need to readjust the parameters to be corrected.

[0022]

EXAMPLES Examples of the present invention will be described below. Figure 1
As an embodiment of the present invention, an example of a block diagram of a CRT display device having a screen aspect ratio of 16: 9 installed in a television receiver or the like is shown. In the figure, reference numeral 1 denotes a sync separation circuit, which converts a video sync signal (CVBS) supplied from a preceding circuit of a television receiver (not shown) into a vertical sync signal (V.SYNC) and a horizontal sync signal (H.SYNC). ) Is separated and output.
Reference numeral 2 denotes a countdown processor including, for example, a counter, which is normally reset by a vertical synchronizing signal and counts horizontal synchronizing signals. For example, a vertical synchronizing signal (V.SYNC) is supplied from the sync separation circuit 1. Even if not performed, the position information S of the vertical screen, which is reset in a predetermined vertical synchronization cycle, is generated and output.

Reference numeral 3 denotes a vertical deflection waveform generator, which outputs a vertical deflection waveform signal (VSAW) which has been subjected to predetermined adjustment based on the vertical screen position information S supplied from the countdown processor 2. The added computing unit 3a outputs the correction waveform information W when the position of the horizontal scanning line is changed from the position information S of the vertical screen by screen scrolling, zooming, or the like, and the error due to the vertical linearity is added. It is done like this. A horizontal deflection correction waveform generator 4 outputs a horizontal deflection correction waveform signal (E / W) for adjusting the horizontal deflection waveform signal based on the correction waveform information W. Reference numeral 5 is a control circuit composed of, for example, a microcomputer, and is adapted to supply a predetermined control signal for controlling the parameters of each part described later to the vertical deflection waveform generator 3.

The operation of the CRT display device of this embodiment is shown in FIG.
This will be described with reference to the output waveforms of the respective parts shown in FIG. First,
Aspect ratio of 16: 9 on screen with aspect ratio of 4: 3
The case where the image of is reproduced as it is will be described. The sync separation circuit 1 separates a vertical sync signal (V.SYNC) and a horizontal sync signal (H.SYNC) from a video sync signal (CVBS) supplied from a preceding block of a television receiver (not shown), and counts down a countdown block. Supplied to Cesa 2. The countdown processor 2 uses the vertical synchronizing signal (V.SYNC) and the horizontal synchronizing signal (H.SYNC) to generate vertical screen position information S corresponding to the vertical synchronizing cycle as shown in FIG. It is supplied to the vessel 3.

The position information S of the vertical screen is an instantaneous value s
Then, s = KT can be shown between the vertical synchronization periods. (However, K is a coefficient and T is time.)

In the vertical deflection waveform generator 3, the above-mentioned functional equation (1) is applied to the instantaneous value s of the position information S on the vertical screen.
To calculate the vertical deflection waveform signal (VSAW). VSAW: v (s) = B (Cs ³ + Ds ² + s) + A (1) where A: Parameter for adjusting vertical screen position B: Parameter for adjusting vertical screen size C, D: Adjusting vertical linearity It is a parameter.

That is, when a 4: 3 image is reproduced as it is on a screen having an aspect ratio of 16: 9, the control circuit 5 changes the parameters "A" to "D" of the functional expression (1) to "A".
₁ "to" is applied to the control signal such that the D ₁ ", from the vertical deflection waveform generator 3, so that the predetermined vertical deflection waveform signal (VSAW) is output.

At the same time, in the vertical deflection waveform generator 3,
The added arithmetic unit 3a calculates the instantaneous value s of the position information S on the vertical screen by the following functional expression (3), and outputs the corrected waveform information W. w (s) = PB (Cs ³ + Ds ² + s) (3) where P is a parameter that determines the usage section of the function u (s) of the equation (2).

That is, the vertical deflection waveform generator 3 outputs a predetermined vertical deflection waveform signal (VSAW) from the position information S of the vertical screen according to the functional expression (1), and at the same time, the additional arithmetic unit 3a outputs the vertical screen waveform. The position information S is converted by the functional expression (3), and the corrected waveform information W corresponding to the vertical position is output.

Then, in the horizontal deflection correction waveform generator 4, the above-mentioned equation (2) is used according to the instantaneous value w of the correction waveform information W.
Is calculated by the following functional expression (4), and the horizontal deflection correction waveform signal (E / W) is output. E / W: u (w) = F (Gw ⁴ + w ² + Hw) + E (4) where E: parameter for adjusting horizontal screen size F: parameter for correcting horizontal pin distortion G: horizontal corner pin distortion Parameter H to be corrected: A parameter to correct horizontal trapezoidal distortion.

That is, in the horizontal deflection correction waveform generator 4, the horizontal deflection correction waveform signal (E / E) for adjusting the horizontal deflection waveform signal by the functional expression (4) based on the correction waveform information W is used.
W). Therefore, the values of the parameters "E" to "H" of the functional expression (4) in this case are taken into consideration so as not to cause horizontal pincushion distortion, for example, "e", "f", " g "and" h ", the horizontal deflection correction waveform generator 4 corrects the horizontal pincushion distortion of the horizontal deflection waveform signal to obtain a highly accurate horizontal deflection correction waveform signal (E / W). ) Will be output.

On the other hand, for example, C having an aspect ratio of 16: 9
In a television receiver having an RT screen, a zoom mode in which an image with an aspect ratio of 4: 3 is displayed on the full screen and an image is projected, or an image that is projected in the vertical direction of the screen in the zoom mode is intentionally displayed on the screen. An image can be displayed in a picture mode such as a wide-zoom mode in which the images are compressed and displayed in the upper and lower parts.

For example, in the case of such a wide zoom mode, the vertical deflection waveform signal (VSAW) output from the vertical deflection waveform generator 3 is a parameter "B" for adjusting the vertical screen size of the above-mentioned functional expression (1). And the values of the parameters "C" and "D" for adjusting the vertical linearity are changed to output a waveform in which the vertical position is corrected. That is, the wide zoom mode is realized by increasing the screen size and intentionally making the vertical linearity non-linear.

Therefore, in this case, the vertical deflection waveform generator 3
By supplying a control signal from the control circuit 5 for setting the values of the parameters “B” to “D” of the functional expression (1) of “B ₂ ” to “D ₂ ” from the vertical deflection waveform generator 3, For example, a vertical deflection waveform signal (VSAW) as shown in FIG. 3 is output.

At this time, the values of "B" to "D" and "P" of the parameters of the functional expression (3) of the arithmetic unit 3a are also changed at the same time. Therefore, the arithmetic unit 3
The correction waveform information W output from a has a waveform corresponding to the vertical position, for example, as shown in FIG. 4, and the correction waveform information W is supplied to the horizontal deflection correction waveform generator 4.

The correction waveform information W supplied to the horizontal deflection correction waveform generator 4 is a waveform corresponding to the vertical position, that is, a waveform in which the vertical position is corrected as a non-linearity of the vertical linearity. "E" to "h" which are the values of the parameters "E" to "H" of (4) initially set
The horizontal deflection correction waveform signal (E / W) as shown in FIG. 5, which corrects the horizontal pincushion distortion of the horizontal deflection waveform signal, is output from the horizontal deflection correction waveform generator 4 without changing the value of Will be output.

That is, even when the vertical deflection waveform signal (VSAW) is enlarged by the wide zoom mode of the picture mode, or when the vertical linearity is made non-linear, the correction parameter "F" of the functional expression (4) is changed each time. ~
There is an advantage that it is not necessary to adjust the value of “H”.

In this embodiment, the case of correcting the horizontal pincushion distortion due to the non-linearity of the vertical linearity has been described. However, the correction is not limited to this correction, but it is necessary to correct the screen position. The same effect can be obtained by using a waveform such as dynamic convergence or dynamic focus.

The vertical deflection waveform generation means 3 and the horizontal deflection correction waveform means 4 are digital circuits equipped with a ROM table for reading the correction amount using the input information as an address signal, or the input position information (S, S, It can be configured by an analog circuit that performs signal processing in W).

[0040]

As described above, the CRT display device of the present invention adjusts the position information of the vertical screen according to the control signal to output a predetermined vertical deflection waveform signal, and also detects the position information of the vertical screen. Since the correction waveform information corresponding to the vertical position is output and the horizontal deflection correction waveform signal for adjusting the horizontal deflection waveform based on the correction waveform information is output, the conventional horizontal deflection correction waveform signal is output. The signal makes it possible to provide a correction waveform signal for horizontal deflection in which the distortion of the horizontal pincushion is corrected with high accuracy.

Further, even when the vertical linearity is controlled to be non-linear or the vertical screen size is adjusted, image distortion due to the horizontal pincushion or the like does not occur, so that the horizontal image distortion is not considered. It becomes possible to control the screen size and linearity in the vertical direction.

[Brief description of drawings]

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

FIG. 2 is a diagram showing position information S of a vertical screen output from the countdown processor according to the embodiment of the present invention.

FIG. 3 is a diagram showing a vertical deflection waveform signal output from the vertical deflection waveform generator according to the embodiment of the present invention.

FIG. 4 is a diagram showing correction waveform information W output from the vertical deflection waveform generator according to the embodiment of the present invention.

FIG. 5 is a diagram showing a horizontal deflection correction waveform signal output from the horizontal deflection correction waveform generator according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example of a block diagram of a conventional CRT display device.

FIG. 7 is a diagram showing position information of a vertical screen output from a countdown processor of a conventional CRT display device.

FIG. 8 is a diagram showing a vertical deflection waveform signal output from a vertical deflection waveform generator of a conventional CRT display device.

FIG. 9 is a diagram showing a horizontal deflection correction waveform signal output from a horizontal deflection correction waveform generator of a conventional CRT display device.

[Explanation of symbols] 1 Sync separation circuit 2 countdown processor 3 Vertical deflection waveform generator 3a arithmetic unit 4 Horizontal deflection correction waveform generator 5 control circuit

Claims (4)

(57) [Claims] 1. A sync separating means capable of separating and outputting a horizontal / vertical sync signal from a video signal, and a vertical sync signal of the vertical sync signal based on a result of counting the horizontal sync signal for each cycle of the vertical sync signal. Waveform generating means for generating vertical screen position information S corresponding to the cycle, and the video signal on the screen as a video of a predetermined aspect ratio
Control means for outputting control signals corresponding to a plurality of display modes to be displayed, and vertical screen position information S generated by the waveform control means.
Based-out, on the control signal outputted from the control means
At least the vertical screen size and vertical
First relational expression including a first parameter group related to arity
Output the adjusted vertical deflection waveform signal and adjust the vertical screen size and vertical linearity.
And the vertical screen position information you output correction waveform information W which converts the S corresponds to the vertical position vertical waveform generator means by the conversion equation containing 1 parameter group, the output from the vertical waveform means -out correction waveform information W to <br/> group Dzu, at least a horizontal screen size, and the horizontal pincushion distortion
A second function including a second parameter group related to horizontal trapezoidal distortion.
The vertical direction corresponding to the corrected waveform information W calculated by the equation
A horizontal deflection correction waveform generating means for outputting a horizontal deflection correction waveform signal for correcting the horizontal deflection waveform signal at a horizontal position, and a CRT display device. 2. A vertical screen as the first parameter group.
Further comprising a parameter related to the position, the instantaneous value v of the vertical deflection waveform signal output from the vertical waveform generator
(S), based on the vertical screen position information S, the first
V (s) = B (Cs ³ + Ds ² + s) + A, which is the relational expression of 1 (where A is
Is the vertical screen position, B is the vertical screen size, and C and D are vertical screen positions.
CRT according to claim 1, wherein the CRT is a parameter for adjusting nearness ).
Display device. 3. The conversion formula further comprises a correction parameter.
A instantaneous value w of the correction waveform information W output from the vertical waveform generating means, with respect to the vertical screen position information S, which is the conversion equation w (s) = PB (Cs 3 + Ds 2 + s ), (Wherein P is a correction parameter), and is corrected by the following: CRT display device according to claim 1 or 2. 4. A horizontal code as the second parameter group.
The instantaneous value u (w) of the horizontal deflection correction waveform signal output from the horizontal deflection correction waveform generation means further includes a parameter related to the nerpin distortion, and the correction waveform information W
Based on the above, the second relational expression u (w) = F (Gw ⁴ + w ² + Hw) + E, where ( E
Is a parameter for adjusting the horizontal screen size, F is a horizontal pin
Distortion, G is horizontal corner pin distortion, H is horizontal trapezoidal distortion
The CRT display device according to claim 1, 2 or 3, wherein the CRT display device is a parameter to be corrected .