JPH08123358A - Matrix plane display device - Google Patents

Abstract

PURPOSE: To obtain a wide large image while maintaining a high definition image by applying an interpolation arithmetic operation using sample image data and obtaining picture element data on a widening pixel data point. CONSTITUTION: A widening point position generation circuit 94 finds plural widening point positions on a screen based on a widening conversion function supplied from widening conversion function memory 93. A mixing ratio value arithmetic circuit 95 selects the sample pixel data positions at four places that exist in the most neighborhood of the widening point position, and finds the degrees of deviation of the widening point positions for the sample pixel data positions at four places. The mixing ratio arithmetic circuit 95 computes the degrees of deviation at all widening point positions, and supplies them to a widening pixel data generation circuit 96 as mixing ratio values. the generation circuit 96 calculates a mixing ratio at the widening point position and the pixel data, and supplies them to a selector 98 as widening pixel data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device, and more particularly to a matrix flat panel display device having a matrix display.

[0002]

2. Description of the Related Art Liquid crystal displays, plasma displays and electroluminescent displays as electronic display devices have been variously researched recently as thin flat display devices. FIG. 1 is a diagram showing a configuration of drive electrodes of a matrix type display panel used in such a flat display device.

In FIG. 1, each of the row electrodes X _{1 to} X _n is formed in a strip shape by the number corresponding to the number of horizontal scanning lines n, and the strip electrodes are formed in a direction orthogonal to each of the row electrodes X _{1 to} X _n. Column electrodes D _{1 to} D _m are formed. On this occasion,
Each intersection of the row electrodes X _{1 to} X _n and the column electrodes D _{1 to} D _m is 1
It becomes a pixel (dot). Therefore, by using such a matrix type display panel, it is possible to realize a flat display device having a resolution of m dots × n lines.

Next, the operation of the flat display device using such a matrix type display panel will be described with reference to FIG. In such a flat display device, first, the supplied video signal is A / D converted at a predetermined sampling frequency to generate digital pixel data. By such A / D conversion, each digital pixel data composed of D _{1 to} D _m can be obtained for each horizontal scanning of the video signal. In other words, D ₁ ~
N sets of digital pixel data composed of D _m will be generated.

Each of the pixel data generated as described above
The column electrodes D are sequentially arranged as shown in FIG.₁~ D_mEach
Applied to. Here, the pixel data D corresponding to the first row
₁~ D_mEach is a column electrode D₁~ D_mThe timing applied to
1st row electrode X at the same time₁Application of scan pulse SP to
Due to the 1st row electrode X₁This first line image is only for each pixel above
The image display corresponding to the raw data is executed. Second line
Pixel data D corresponding to ₁~ D_mEach is a column electrode D₁~ D_mTo
The second row electrode X is applied at the same time as the application timing₂Scan the
By applying the loose SP, the second row electrode X₂Each above
Image display corresponding to the pixel data of the second row only for pixels
Run. This operation is similarly performed for the third and subsequent lines.
Image display up to the nth line, that is, one field
The image is displayed.

In recent years, wide wide screen display devices having a wide aspect ratio of 16: 9 have been commercialized. There is a demand for such a wide screen even in a flat panel display device using the matrix type display panel, that is, a matrix type flat panel display device. In order to realize such a wide screen, by increasing the number of column electrodes and row electrodes of the matrix type display panel as shown in FIG. 1 (compared to the case where the aspect ratio is 4: 3), 1 while maintaining high definition images
A method of obtaining a wide image of 6: 9 can be considered.

However, since the number of horizontal scanning lines of the supplied video signal is regulated by the system peculiar to the video signal, the number of row electrodes cannot be made larger than the number of horizontal scanning lines. . Also, in a cathode ray tube type display device, a video signal having an aspect ratio of 4: 3 as in the NTSC system is used by changing the scanning speed of the electron beam with which the cathode ray tube is irradiated near the edge of the screen and near the center of the screen. 16: 9 wide image can be provided.

However, as described above, in the matrix type display panel, the digital pixel data D _{1 to} D _m for one horizontal scanning are respectively associated with the corresponding column electrodes D _{1 to} D _m.
It is configured to be applied simultaneously to each of the. Therefore, the analog video signal itself before sampling is 16:
If the aspect ratio of 9 is not satisfied,
A wide image of 16: 9 cannot be obtained.

As described above, such a matrix type flat display device has a problem that it is impossible to obtain a wide wide image while maintaining a high definition image from a video signal having an aspect ratio of 4: 3.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a matrix type flat display device capable of obtaining a large wide image while maintaining a high definition image. With the goal.

[0011]

SUMMARY OF THE INVENTION A matrix type flat panel display device according to the present invention is an A / D for sampling a supplied video signal to obtain a plurality of sample pixel data corresponding to each image position in one frame of an original image. A converter,
Means for setting a plurality of widened pixel data points in one frame of the original image, and selecting four sample pixel data existing at positions closest to each of the widened pixel data points from the sample pixel data. hand,
Mixing ratio calculation means for obtaining the deviation degree of the position of the widened pixel data point with respect to the image position of each of these four sample pixel data as a mixing ratio, and interpolation calculation based on the mixing ratio and the four sample pixel data. Widening pixel data generating means for respectively obtaining widening pixel data at each existing position of each widening pixel data point, and a matrix type display panel for performing a display operation based on the widening pixel data.

[0012]

A plurality of widened pixel data points are set at a plurality of predetermined positions on one frame of the original image, and the widened pixel data points are present in the vicinity of these widened pixel data points.
Pixel data on the widened pixel data point is obtained by interpolation calculation using one sample pixel data, and this is supplied to the matrix type display panel as widened pixel data.

[0013]

FIG. 3 is a diagram showing the structure of a matrix type flat display device according to the present invention. In FIG. 3, the sync separation circuit 1 extracts horizontal and vertical sync signals from the input video signal and supplies them to the timing generation circuit 2.

The timing generation circuit 2 generates a synchronization timing signal according to the extracted horizontal and vertical synchronization signals and supplies it to each of the memory control circuit 5 and the read timing signal generation circuit 7. Further, the timing generating circuit 2 generates a sampling clock signal of a predetermined frequency synchronized with the horizontal and vertical synchronizing signals extracted as described above, and supplies this to the A / D converter 3.

The A / D converter 3 samples the supplied video signal in accordance with the sampling clock signal and converts the analog video signal into digital sample pixel data. Such sampling operation, the video signal 1, each sample pixel data each of D ₁ Dm of a predetermined number of bits is obtained for each horizontal scanning these are supplied to the wide data conversion circuit 9. The memory control circuit 5 supplies the frame memory 4 with a write signal and a read signal in synchronization with the synchronization timing signal supplied from the timing generation circuit 2.

When the display selection command signal corresponding to the 4: 3 display command is supplied, the widened data conversion circuit 9
Sample pixel data D ₁ supplied from the A / D converter 3
To Dm are supplied to the frame memory 4 as they are, and when a display selection command signal corresponding to a wide image display command is supplied, the sample pixel data D _{1 to} Dm supplied from the A / D converter 3 are widened. The widened pixel data A _{1 to} Ap obtained by data conversion are supplied to the frame memory 4.

FIG. 4 shows such a widened data conversion circuit 9
It is a figure which shows an example of a structure of. In FIG. 4, the widening conversion function memory 93 stores the widening function for obtaining the same number of widening point positions as the number of pixels formed on the matrix type display panel 11 described later. The widening point position generation circuit 94 obtains a plurality of widening point positions on the screen based on the widening conversion function supplied from the widening conversion function memory 93. The mixing ratio value calculation circuit 95 selects four sample pixel data positions existing closest to the widening point position, and obtains a deviation degree of the widening point position with respect to the four sample pixel data positions. The mixture ratio value calculation circuit 95 calculates the degree of deviation at all widening point positions and supplies these to the widened pixel data generation circuit 96 as a mixture ratio value. The sample pixel data memory 97 sequentially accumulates the sample pixel data supplied from the A / D converter 3 for each horizontal scanning. Widened pixel data generation circuit 9
First, 6 reads out from the sample pixel data memory 97 the four sample pixel data existing closest to the widening point position. Next, the pixel data at the widening point position is calculated based on the mixture ratio value at the widening point position and the four sample pixel data read out as described above, and this is calculated as widening pixel data in the selector 98. Supply.

When the display selection command signal corresponding to the wide image display command is supplied, the selector 98 supplies the widened pixel data supplied from the widened pixel data generation circuit 96 to the frame memory 4. When the display selection command signal corresponding to the 4: 3 display command is supplied, the sample pixel data supplied from the A / D converter 3 is supplied to the frame memory 4.

The frame memory 4 sequentially takes in each pixel data supplied from the widening data conversion circuit 9 in response to the write signal supplied from the memory control circuit 5. Further, the frame memory 4 sequentially reads the pixel data stored in the frame memory 4 in accordance with the read signal and supplies the pixel data to the output processing circuit 6 of the next stage. The read timing signal generation circuit 7 generates a scanning timing signal that controls the timing of the scanning display operation according to the synchronization timing signal supplied from the timing pulse generation circuit 2, and outputs the scanning timing signal to the row electrode drive pulse generation circuit 10 and the output processing. Supply to each of the circuits 6. The row electrode drive pulse generation circuit 10 generates a scan pulse SP for executing image display,
This is displayed on the display panel 11 according to the scanning timing signal.
Are sequentially applied to the row electrodes X _{1 to} Xr.

The output processing circuit 6 includes the frame memory 4
Each pixel data supplied for every one horizontal scanning from is fetched in one frame unit, further grouped into each bit, and the pixel data is supplied to the column electrode drive pulse generation circuit 12 in this group unit. To do. For example, if each pixel data for one horizontal scan supplied from the frame memory 4 is pixel data consisting of 2 bits, first, only the first bit of each pixel data is extracted and these are driven by the column electrodes. It is supplied to the pulse generation circuit 12, and then only the second bit of each of these pixel data is extracted and supplied to the column electrode drive pulse generation circuit 12.

The column electrode drive pulse generating circuit 12 is
The column electrode D of the display panel 11 is generated by generating a pixel data pulse having a voltage value corresponding to the logic "1" or "0" of the pixel data in each pixel data of 1 bit supplied from the output processing circuit 6. Apply to _{1 to} Dp. The display panel 11 is a wide display panel having an aspect ratio of 16: 9 and has a resolution of p dots × r lines with the number p of column electrodes and the number r of row electrodes. At this time, the number p of column electrodes formed on the display panel 11 is larger than the number m of pixel data for one horizontal scan of the video signal obtained by sampling by the A / D converter 3. is there. Further, the number r of row electrodes formed on the display panel 11 is larger than the number of horizontal scanning lines of the supplied video signal.

Next, the operation of the present invention in such a configuration will be described. In the operation description, the aspect ratio of the supplied video signal is 4: 3 and the number of horizontal scanning lines per frame is 3. Furthermore, the A / D converter 3 in FIG. 3 performs the A / D conversion operation at a sampling frequency fs such that four sample pixel data are obtained per horizontal scanning line of the video signal. The display panel 11 is a wide display panel having a screen aspect ratio of 16: 9, which has six column electrodes and four row electrodes.

FIG. 5 shows A / D conversion under such conditions.
Sample pixel data D obtained by the instrument 3₁₁~ D₄₃Each
It is a figure which shows the sample position on the original image DP.
The original image DP is based on the supplied video signal.
One frame of an image with an aspect ratio of 4: 3
It is shown. In FIG. 5, [D₁₁, D_{twenty one},
D₃₁, D₄₁] Is the first horizontal scan of the supplied video signal
Sample pixel obtained when sampling the line
Data, [D₁₂, D_{twenty two}, D₃₂, D₄₂] Supplied
The second horizontal scan line of the captured video signal
Sample pixel data obtained when₁₃,
D _{twenty three}, D₃₃, D₄₃] Is the third water of the supplied video signal
The sample obtained when sampling the flat scan line
Pixel data. In FIG. 5, the sample pixel data
Data D₁₁The x-direction position on the original image DP in the a and y directions
Of each sample pixel data when the facing position is b
The sample position is shown. In the figure, d is water
It shows a flat scan line interval.

At this time, the display selection corresponding to the 4: 3 display command is made.
When the selection command signal is supplied, the widening data conversion
The selector 98 in the path 9 uses the sample pixel data D₁₁~ D
₄₃Is directly supplied to the frame memory 4. Such operation
The column electrode drive pulse generation circuit 12 responds to the
In the second to fifth column electrodes among the first to sixth column electrodes of the rule 11,
Sample pixel data [D₁₁, D_{twenty one}, D₃₁, D₄₁],
[D₁₂, D_{twenty two}, D₃₂, D ₄₂], [D₁₃, D_{twenty three}, D₃₃, D
₄₃] Pixel data pulses corresponding to each are sequentially applied.
Further, the row electrode drive pulse generation circuit 10 is provided in the display panel 1
Of the first to fourth row electrodes, the scanning pulse is applied to the first to third row electrodes.
Space SP is sequentially applied.

FIG. 6 is a diagram showing a display state of the display panel 11 which is made by such an operation. As shown in FIG.
When the display selection command signal corresponding to the 4: 3 display command is supplied, the sample pixel data D _{11 to} D ₄₃ are used as they are, and 4: 3 is displayed on the display panel 11 having the screen aspect ratio of 16: 9. The image display having the aspect ratio of is performed.

Next, the operation when the display selection command signal corresponding to the wide image display command is supplied will be described. 7 and 8 are diagrams showing an example of the widening conversion function stored in the widening conversion function memory 93 in FIG. The widening conversion function A shown by the solid line in FIG. 7 is a function that can obtain more widening point positions near both ends of the screen than near the center of the screen, and each column electrode of the display panel 11 and the screen x It is possible to show a correspondence relationship with each widening point position in the direction.

The widening conversion function B shown by the solid line in FIG. 8 can show the correspondence between each row electrode of the display panel 11 and each widening point position in the screen y direction. Here, when the widening conversion functions A and B are supplied to the widening point position generating circuit 94, first, the widening point position generating circuit 94 of the display panel 11 is based on the widening conversion function A. The x-direction widening point positions x _{1 to} x ₆ corresponding to the first to sixth column electrodes are obtained. Next, the widening point position generation circuit 94, based on the widening conversion function B in FIG. 8, the y-direction widening point positions y ₁ to y corresponding to the first row electrode to the fourth row electrode of the display panel 11, respectively. Ask for ₄ respectively. The widening point position generation circuit 94 obtains these x-direction widening point positions x _{1 to} x ₆ and y.
Widening pixel data points A ₁₁ -A ₆₄ are obtained based on the direction widening point positions y ₁ -y ₄ .

That is, with the configuration including the widening conversion function memory 93 and the widening point position generating circuit 94,
The positions of the widened pixel data points, which is the same as the number of pixels of the display panel 11 (24 column electrodes × 4 row electrodes 4), are set. FIG. 9 shows such widened pixel data points A _{11 to} A ₆₄ and sample pixel data D _{11 to} D _64.
43 is a diagram showing a positional relationship on each original image DP. FIG.

The mix ratio value arithmetic circuit 95 operates on each of the widened pixel data points as shown in FIG.
The sample pixel data at four places existing in the nearest neighborhood is selected, and the deviation degree of the position of the widened pixel data point with respect to the position of each of the sample pixel data at these four places is obtained. The mixture ratio value calculation circuit 95 obtains the deviation degree for each of the widened pixel data points A _{11 to} A _{64 and} sets it as the mixture ratio value.

An example of calculation for obtaining the above-mentioned mixture ratio value will be described below using the widened pixel data point A ₂₂ in FIG. As shown in FIG. 10, the sample pixel data existing in the vicinity of the widened pixel data point A ₂₂ is 4 of D ₁₁ , D ₂₁ , D ₁₂ and D ₂₂ .
It is a point. At this time, the deviation degree Kx = (x ₂ −a) / (1 / fs) in the x direction between the sample pixel data D ₁₁ and D ₂₁ (or between D ₁₂ and D ₂₂ ). or,
Deflection degree Ky = (b− in the y direction between sample pixel data D ₁₁ and D ₁₂ (or between D ₂₁ and D ₂₂ ).
y ₂ ) / d. The Kx and Ky are supplied to the widened pixel data generation circuit 96 as the mixing ratio value at the widened pixel data point A ₂₂ .

The mixture ratio value calculation circuit 95 supplies each of the mixture ratio values obtained by similarly performing such calculation to all the widened pixel data points to the widened pixel data generation circuit 96. The widened pixel data generation circuit 96 reads out from the sample pixel data memory 97 four sample pixel data existing in the closest vicinity of each of the widened pixel data points A _{11 to} A ₆₄ as shown in FIG. Pixel data on the widened pixel data point, that is, widened pixel data is calculated based on the read four sample pixel data and the mixture ratio value.

An operation example of the above-described widened pixel data calculation will be described below using the widened pixel data point A ₂₂ in FIG. Sample pixel data existing closest on such wide pixel data points A ₂₂ are four points D _11, D _21, D ₁₂ and D _22. Therefore, the widened pixel data generation circuit 96 firstly extracts the sample pixel data D ₁₁ from the sample pixel data memory 97.
Each of D ₂₁ , D ₁₂ and D ₂₂ is read. Next, using the sample pixel data D ₁₁ , D ₂₁ , D ₁₂ and D ₂₂ , the widened pixel data on the widened pixel data point A ₂₂ is calculated by the following formula.

[0033]

[Formula 1] A ₂₂ = {D ₁₁ (1-Kx) + D ₂₁ · Kx} · (1-Ky) + {D
₁₂ (1-Kx) + D ₂₂ · Kx} · Ky In other words, this widened pixel data is obtained by performing linear interpolation using the four sample pixel data existing closest to the corresponding widened pixel data point position. The pixel data at the point position is obtained as widened pixel data.

The widened pixel data generation circuit 96
For each widened pixel data point
Widen pixel data A₁₁~ A₆₄Each
Calculate and supply them to the selector 98. At this time,
The light selector 98 corresponds to the wide image display command.
At this time, since the display selection command signal is supplied,
Widened pixel data A₁₁~ A₆₄Is such a selector 98
Is supplied to the frame memory 4 in FIG.
Therefore, the column electrode drive pulse generation
The channels 12 are connected to the first to sixth column electrodes of the display panel 11 as described above.
Idized pixel data [A₁₁, A_{twenty one}, A₃₁, A₄₁, A₅₁, A
₆₁], [A₁₂, A_{twenty two}, A₃₂, A₄₂, A₅₂, A₆₂], [A
₁₃, A_{twenty three}, A₃₃, A₄₃, A₅₃, A₆₃], [A₁₄, A_{twenty four},
A₃₄, A ₄₄, A₅₄, A₆₄] Pixel data pattern corresponding to each
Rus are applied sequentially. Furthermore, a row electrode drive pulse generation circuit
Reference numeral 10 denotes a scan pulse S on the first to fourth rows of the display panel 11.
P is applied sequentially.

FIG. 11 is a diagram showing a display state of the display panel 11 which is made by such an operation. As shown in FIG. 11, when the display selection command signal corresponding to the wide image display command is supplied, the widened pixel data A _{11 to} A ₆₄ generated by the widened pixel data generation circuit 96 is used to
Wide image display having an aspect ratio of 16: 9 is performed on the display panel 11 having a screen aspect ratio of 6: 9. At this time, only the image near the edge of the screen of the display panel 11 is horizontally stretched, while the actual image corresponding to the supplied video signal is obtained near the center of the screen.

As described above, the A / D converter 3
The sample pixel data is D₁₁~ D ₄₃Is 12 of
However, in the end, 24 wide lines were
Pixel data A₁₁~ A₆₄Is obtained. Tsuma
Depends on the number of sample pixel data per frame
Since the number of pixels formed on the display panel 11 can be set without doing
By increasing the number of pixels formed on the display panel 11, a high-definition image can be displayed.
It is possible to obtain a wide wide image while maintaining the image.
Is.

[0037]

As described above, in the matrix type flat display device according to the present invention, a plurality of widening pixel data points are set at a plurality of predetermined positions on one frame of an image, and the widening pixel data points are set. The pixel data on the widened pixel data point is obtained by the interpolation calculation using the four sample pixel data existing in the nearest neighborhood, and the pixel data is supplied to the matrix type display panel as the widened pixel data.

Therefore, according to the matrix type flat panel display device of the present invention, the supplied video signal is A /
It is possible to obtain an arbitrary number of widened pixel data regardless of the number of sample pixel data for one frame obtained by D conversion, so that the number of pixels of the matrix type display panel can be increased to obtain a high-definition image. It is possible to obtain a wide wide image having an aspect ratio of 16: 9 from a video signal having an aspect ratio of 4: 3 while maintaining it.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of drive electrodes of a matrix type display panel.

FIG. 2 is a diagram showing an operation example of a flat display device.

FIG. 3 is a diagram showing a configuration of a matrix type flat panel display device according to the present invention.

FIG. 4 is a diagram showing an internal configuration of a widened data conversion circuit 9.

FIG. 5: Original image D of each of sample pixel data D _{11 to} D ₄₃
It is a figure which shows the sample position on P.

6 is a diagram showing a display state of the display panel 11. FIG.

7 is a diagram showing a widening conversion function A. FIG.

FIG. 8 is a diagram showing a widening conversion function B.

FIG. 9 is a diagram showing sample positions of sample pixel data D _{11 to} D ₄₃ and widened pixel data points A _{11 to} A _{64 on} the original image DP.

FIG. 10 is a diagram used to obtain a mixture ratio value at a widened pixel data point A ₂₂ .

11 is a diagram showing a display state of the display panel 11. FIG.

[Explanation of symbols for main parts]

 9 Widening data conversion circuit 11 Display panel 93 Widening conversion function memory 94 Widening point position generation circuit 95 Mixing ratio value calculation circuit 96 Widening pixel data generation circuit 97 Sample pixel data memory 98 Selector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area H04N 5/92 7/01 G

Claims (2)

[Claims] 1. An A / D converter for sampling a supplied video signal to obtain a plurality of sample pixel data corresponding to respective image positions in one frame of an original image, and a plurality of wide pixels in one frame of the original image. Means for setting a widened pixel data point, and selecting four sample pixel data existing in the nearest position of each of the widened pixel data points from the sample pixel data, respectively, and selecting each of the four sample pixel data. Mixing ratio calculation means for obtaining a deviation degree of the position of the widened pixel data point with respect to the image position as a mixing ratio, and interpolation calculation based on the mixed ratio and the four sample pixel data to widen the pixel data point. Widened pixel data generating means for respectively obtaining widened pixel data at each existing position; Matrix flat display device, characterized in that it comprises a matrix display panel which forms a display operation based on the wide pixel data. 2. The matrix type flat panel display device according to claim 1, wherein the interpolation calculation is a linear interpolation calculation.