JP2000020014A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture display device capable of expanding a video signal so as to meet the resolution of a display panel without lowering the contrast. SOLUTION: Relating to a picture display device having a display panel in which a prescribed number of horizontal and vertical pixels is set, in the case that the horizontal pixels of the display panel is larger than those of the video signals in numbers, each of the original video data is stored as it is, at the data assignment position having a correlation closest to each of the plural pieces of the original video data A, B, C, D, E that form a horizontal pixel line of the video signals, in an interpolation data calculation forming circuit. Simultaneously, at the assignment position of the remaining interpolation data, the calculation results x, y, z are stored which are obtained from the two original video data stored at the assignment position adjacent to that of the remaining interpolating data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly to a function of enlarging and displaying a video signal when the number of pixels of a display panel is larger than the number of pixels of the video signal input to the device. The present invention relates to an image display device having the same.

[0002]

2. Description of the Related Art For example, in an image display device for a personal computer or the like, a standard is set for the number of pixels of a display panel, and VGA standard, SVGA standard, XGA standard, SXGA standard, UXGA standard and the like are typical. Widely known as The number of pixels constituting one screen of these standards is as follows. VGA standard; horizontal direction: 640 pixels, vertical direction: 480 pixels SVGA standard: horizontal direction: 800 pixels, vertical direction: 600 pixels XGA standard: horizontal direction: 1024 pixels, vertical direction 768 pixels SXGA standard; horizontal direction: 1280 pixels, vertical direction: 1024 pixels UXGA standard; horizontal direction: 1600 pixels, vertical direction: 1200 pixels (VGA, SVGA, XGA, SXG
A and UXGA are registered trademarks of IBM Corporation)

However, there is a case where an image composed of a VGA video signal is displayed on a display panel conforming to the XGA standard. In this case, the VGA video signal is converted to a higher resolution X-ray.
It needs to be enlarged and displayed on the GA display panel. 2. Description of the Related Art Conventionally, for example, the following two methods are known as examples of a signal enlargement technique in this type of image display device.

A first method is a method of switching a sampling frequency when an analog signal is converted into a digital signal using a clock in the analog / digital converter 101, as shown in FIG. For example, as shown in FIG. 9, when an analog signal as shown at the top is sampled by a clock 1 having a constant frequency, A, B,
Digital data 1 such as C, D, E, F, G, ...
However, if the same analog signal is sampled with a higher frequency clock 2, h, i, and
Digital data 2 such as j, k, l, m, n, o, p, q, r,... are obtained, and the number of data is increased as compared with the clock 1, that is, the video signal is expanded. Become.

A second method is to detect the resolution of a video signal, set an enlargement ratio based on the ratio with the display panel, and complement the video signal for one screen by an arithmetic circuit based on the enlargement ratio. To be displayed. For example, VGA
When converting the video signal for XGA, the enlargement factor is 1.6 times, so that it is sufficient to convert five data to eight data. Specifically, as shown in FIG. 10, five data of A, B, C, D, and E before conversion are calculated, and h, i, j, k, l, m, n, and o are newly calculated. The above eight data may be used. The operation expression at this time is that data h is h
= A × 1.0, i = A × 0.3 + B × 0.
2, j = B × 1.0 for data j, k = B for data k
× 0.1 + C × 0.4, l = C × 0.4 +
D × 0.1, m = D × 1.0 for data m, n = D × 0.2 + E × 0.3 for data n, o = E × for data o
1.0, respectively.

[0006]

However, the above-mentioned 2)
Each of the two signal amplification techniques has the following problems. In the first method, when the data is a video signal of a personal computer, the data is different from the original signal, so that a sampling error may occur, thereby causing flicker and deteriorating the image quality. Further, when sampling cannot be performed at the maximum value or the minimum value of the analog signal waveform, there is a problem that the contrast is reduced.

In the second method, there is a problem that since the data before conversion does not reliably remain, the contrast is reduced and the display quality is impaired. In the example shown in FIG. 10, among the data A, B, C, D, and E before conversion, four values of the data A, B, D, and E are multiplied by a coefficient of 1.0. The converted data becomes h, j, m, and o, and the data before the conversion remains as it is. However,
Only the data C before the conversion is the data k and the data l after the conversion.
It is dispersed as a component in and does not remain as it is. Therefore, when viewed as a whole video signal, the data after conversion is substantially similar to the data before conversion, but when viewed individually, the contrast is reduced due to the loss of data such as data C in this example. Would.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an image display apparatus capable of expanding a video signal so as to match the resolution of a display panel without lowering contrast. The purpose is to provide.

[0009]

In order to achieve the above object, an image display apparatus according to the present invention provides a display panel having a predetermined number of horizontal pixels and a predetermined number of vertical pixels. Also, when the number of horizontal pixels of the display panel is large, each of the original image data is stored as it is at a data allocation position closest to each of a plurality of original image data forming one horizontal pixel line of the video signal, The remaining data allocation position is provided with an interpolation data calculation generation circuit for storing calculation results obtained from two original image data stored in allocation positions adjacent to the allocation position.

According to another image display apparatus of the present invention, each of the original image data is stored as it is at a data allocation position closest to each of the plurality of original image data, and the remaining data allocation positions are stored at the remaining data allocation positions. Is characterized by comprising an interpolation data operation generation circuit for switching and accommodating one of two original image data accommodated in an assignment position adjacent to the assignment position by an adjacent horizontal pixel line of the video signal. is there. Further, in the interpolation data calculation generation circuit, any one of the two original image data at the allocation positions adjacent to the remaining data allocation positions may be switched and accommodated for each frame constituting one screen.

That is, the most characteristic feature of the image display device of the present invention is that each of the original image data is stored as it is at a data allocation position which has the closest correlation to each of the plurality of original image data. Then, there are three possible modes for storing data in the remaining storage location storing the original image data, and a mode for storing the calculation result obtained from two original image data stored in adjacent allocation positions, A mode in which one of the two original image data stored in the adjacent allocation positions is switched and stored by the adjacent horizontal pixel line of the video signal, and one of the two original image data in the adjacent allocation positions constitutes one screen. This is a mode of switching and accommodating each frame. As an example of the above calculation, a method of multiplying each of two adjacent original image data by a coefficient may be considered.

In the above-mentioned conventional second method, there is a loss of contrast after conversion in the original image data, so that the contrast is reduced. However, in the case of enlarging a signal, the number of data after conversion is always larger than the number of data of original image (before conversion) data. After setting the allocation position of the converted data in the data operation generation circuit, first, each of the original image data is stored so as to remain at the position closest to the correlation with each of the original image data. Then, the remaining allocation positions accommodate either one of the two adjacent original image data or the operation results of the two adjacent original image data. In any case, in the case of the image display device of the present invention, since loss of data in the original image data does not occur at the time of conversion, the enlarged image can be displayed on the display panel without deteriorating the display quality while maintaining the contrast of the original image. It can be displayed.

In the interpolation data operation generating circuit, one of the two original image data adjacent to the remaining data allocation position accommodating the original image data is multiplied by a coefficient and the other is multiplied by a coefficient. In the case where the result obtained by adding the result of multiplication of the original image data to the original image data before the interpolation processing is accommodated, the difference between the maximum value and the minimum value of the magnification of each corresponding original image data after the interpolation processing is 25 times the maximum value. It is preferable to set the above coefficients so as to be not more than%. With this configuration, it is possible to maintain the average luminance of the original image before data conversion.

In the above, the case where the video signal is expanded in the horizontal direction when the number of horizontal pixels of the display panel is larger than the number of horizontal pixels of the video signal has been described. It is possible. That is, when the number of vertical pixels of the display panel is larger than the number of vertical pixels of the video signal in the display panel in which the predetermined number of horizontal pixels and the number of vertical pixels are respectively set, a plurality of pixels forming one vertical pixel column of the video signal Each of the original image data is stored as it is at the data allocation position closest to each of the original image data, and the two original images stored at the allocation positions adjacent to the allocation position are stored at the remaining data allocation positions. What is necessary is just to provide an interpolation data operation generation circuit which stores the operation result obtained from the data.

[0015] As in the case of the horizontal direction, the data is stored in the remaining storage location that stores the original image data, and the calculation result obtained from the two original image data stored in the adjacent allocation positions is stored as in the case of the horizontal direction. In addition to the form,
Either one of the two types of original image data is switched and accommodated by the adjacent vertical pixel columns of the video signal, or the other is switched and accommodated for each frame constituting one screen. Also in the case of enlargement in the vertical direction, the difference between the maximum value and the minimum value of the magnification of each corresponding original image data after the interpolation process for each original image data before the interpolation process is 25% or less of the maximum value. By setting each of the above coefficients, the average luminance of the original image before data conversion can be maintained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram illustrating a schematic configuration of an image display device according to the present embodiment, and FIG. 2 is a diagram illustrating a form of data before and after interpolation processing of image data. As shown in FIG. 1, the image display device according to the present embodiment includes a frame memory 1, a line memory 2, a resolution determination circuit 3, a data number conversion circuit 4, an interpolation data calculation A generation circuit 5 and the like are provided. Then, a digital signal subjected to the interpolation processing is generated in the interpolation data calculation generation circuit 5, and the signal is supplied to the display panel 6. Although not described and shown in the drawings, the present image display device includes a drive circuit, a control circuit, and the like for driving the display panel 6.

In this embodiment, the resolution of the display panel 6 is the XGA standard (the number of horizontal pixels: 1024), the input video signal is the VGA specification (the number of horizontal pixels: 640), and is 1.6 times in the horizontal direction. An example in which the video signal is enlarged (interpolation processing) at the conversion magnification of will be described below.
Here, only the horizontal enlargement will be described, and an example of the vertical enlargement will be described in an embodiment later.

First, VGA specification, frequency 25.175M
Hz original image data is written into the frame memory 1. The frame memory 1 stores data in units of one screen. Here, the original image data is already a digital signal. Next, the data is stored in the frame memory 1 in response to the input of a read enable signal (denoted by RE in FIG. 1) and a shift control signal (denoted by SF in FIG. 1) from the data number conversion circuit 4 described later. The data is sent to the interpolation data operation generation circuit 5 and the line memory 2. The line memory 2 is a memory for storing data for one horizontal pixel line, and is for delaying data in line units.

On the other hand, a horizontal synchronizing signal (denoted by HD in FIG. 1) and a clock signal (denoted by CLOCK in FIG. 1)
Is input to the resolution determination circuit 3, the original image data
It is determined whether the specification is GA, SVGA, XGA,..., Etc., and a different signal corresponding to each specification is output to the data number conversion circuit 4.

In the data number conversion circuit 4, a control signal when the data storage location is generated by the interpolation data calculation generation circuit 5 is generated according to the conversion magnification, and is output to the interpolation data calculation generation circuit 5. In the case of the present embodiment, since the conversion magnification is 1.6 times, the number of data can be increased from five to eight. Therefore, when the data number conversion circuit 5 recognizes that the original image data conforms to the VGA specification based on the signal from the resolution discrimination circuit 3, the data number conversion circuit 5 determines the storage locations of the five original image data and the three interpolation data. A control signal for generating a total of eight data storage locations is output to the interpolation data calculation generation circuit 5.

Therefore, in the interpolation data operation generation circuit 5,
As shown in FIG. 2, 640 pieces of image data per one horizontal pixel line are divided into five data unit blocks A, B, C, D, and E. Then, three storage locations for interpolation data are created in this block, and the number of data storage locations in one block is increased to eight. Then, the original image data A, B, C, D, and E are directly stored in five of the eight data storage locations (indicated by arrows in FIG. 2). At this time, for example, A, B, C, D, and E are not left-justified and stored in the eight data storage locations after the conversion in FIG. In a data allocation position close to. As a result of accommodating the original image data, in this example, three places between A and B, between C and D, and between D and E become accommodation places for the interpolation data X, Y, and Z.

Next, the calculation results using the two original image data of the adjacent storage locations are stored in the storage locations of the three interpolation data X, Y, and Z (indicated by arrows in FIG. 2). That is, the data X stored in the storage location between A and B contains A
And B, the calculation result of C and D is stored in the storage location between C and D, and the data Z is stored in the storage location between D and E. And E are substituted for the respective calculation results. In the case of the present embodiment, specifically,
X = A × 0.5 + B × 0.5, Y = C × 0.675 + D
× 0.325, Z = D × 0.325 + E × 0.675. As a result, the enlargement magnification of each image data after data conversion with respect to before image data conversion is 1.5 times for A, 1.5 times for B, 1.675 times for C, 1.65 times for D, and 1.65 times for E. It becomes 1.675 times.

Conceptually, interpolation data is generated by the above-described procedure. However, on an actual circuit, the interpolation data calculation generation circuit 5 includes a plurality of D-flip-flops such as a delay circuit, a calculator, and a selector. Each of the D-flip-flops transmits image data A, B, C, D,
The selector selects whether to output E as it is or to calculate two image data based on the above expression using an arithmetic unit and output the calculation results X, Y, and Z. This switching is performed by a selector control signal from the data number conversion circuit 4.

The image display device according to the present embodiment is configured such that the original image data A,
Each of the data A, B, C, D, and E is accommodated so as to always remain at the position closest to the correlation with each of B, C, D, and E. This is to accommodate the calculation results X, Y, Z of the original image data A, B, C, D, E. Therefore, according to the image display device of the present embodiment, since there is no loss of the original image data during data conversion, the image is enlarged to the entire XGA display panel without deteriorating the display quality while maintaining the contrast of the original image. Images can be displayed.

Also, in the case of the present embodiment, by using the above-mentioned arithmetic expression when generating the interpolation data, the expansion of the corresponding original image data after the interpolation processing to the original image data before the interpolation processing is performed. The magnification is 1.5 times, 1.5 times, 1.675 times, 1.65 times for A, B, C, D and E, respectively.
1.675 times. Therefore, the value (1.675-1.5 = 0.175 times) of the difference between the maximum value (1.675 times) and the minimum value (1.5 times) of these magnifications is about 10% of the maximum value. It is. Restricting this value to 25% or less means that the variation in the conversion magnification is small, and thereby the average luminance of the original image before data conversion can be maintained.

[Second Embodiment] Hereinafter, a second embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating a form of data before and after data interpolation processing in the image display device according to the present embodiment. The basic configuration of the image display device of the present embodiment and the point that the video signal of the VGA specification is enlarged to the XGA display panel at a conversion magnification of 1.6 times is the first point.
This embodiment is the same as the first embodiment, except that the arithmetic expression used when generating the interpolation data is different. Therefore, description of the basic configuration of the image display device is omitted here.

In the interpolation data calculation and generation circuit according to the present embodiment, as shown in FIG.
After dividing into five data unit blocks C, D, and E, the number of data storage locations in one block is increased to eight,
The original image data A, B, C, D, and E are directly stored in five of them (indicated by arrows in FIG. 3). In this case, the original image data A, B, C, D, and E are accommodated in the data allocation positions having the closest correlation to each other, as in the first embodiment.

Next, the calculation results X, Y, and Z using the two original image data of the adjacent storage locations are stored in the storage locations of the three interpolation data (indicated by arrows in FIG. 3). In the case of the embodiment, X = A × 0.5 + B × 0.5, Y = C ×
It is assumed that 0.5 + D × 0.5 and Z = D × 0.5 + E × 0.5. That is, all the coefficients to be multiplied by the original image data are 0.5
And As a result, the enlargement magnification of each image data after data conversion with respect to before image data conversion is 1.5 times for A, 1.5 times for B, 1.5 times for C, 2.0 times for D, and 2.0 times for E. 1.5 times.

In the image display device of the present embodiment,
Since the original image data is not lost at the time of data conversion, it is possible to maintain the contrast of the original image.
The same effect as that of the embodiment can be obtained. Also, the enlargement magnifications of the corresponding original image data after the interpolation process with respect to the original image data before the interpolation process are A, B, C, D,
E, 1.5 times, 1.5 times, 1.5 times, 2.0 times respectively
And 1.5 times, the maximum value of these magnifications (2.0
Times) and the minimum value (1.5 times) (0.5 times) is 25% of the maximum value. This makes it possible to maintain the average luminance of the original image before data conversion.

Further, in the case of the present embodiment, all coefficients to be multiplied by the original image data are set to 0.5. It has an advantage that the circuit configuration of the interpolation data calculation generation circuit can be simplified as compared with the first embodiment which requires the calculation of .675 times, 0.325 times or the like.

[Third Embodiment] Hereinafter, a third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 4 is a diagram showing the form of data before and after data interpolation processing in the image display device of the present embodiment. The basic configuration of the image display device of the present embodiment is the same as that of the first and second embodiments,
The difference is that the video signal of the VGA specification is enlarged to the UXGA display panel at a conversion magnification of 2.4 times. Therefore, description of the basic configuration of the image display device is omitted.

In the interpolation data calculation and generation circuit according to the present embodiment, as shown in FIG.
After division into five data unit blocks C, D, and E, the number of data storage locations in one block is increased to 12, and the original image data A, B, C, D,
E is accommodated two by two. At this time, the original image data A, B,
Two pieces of original image data A, B, C, D, and E are accommodated in two data allocation positions closest to C, D, and E, respectively (indicated by arrows in FIG. 4).

Next, the two original image data A and B, D, and D in the adjacent storage locations are stored in the storage locations of the two pieces of interpolation data X and Y between the original image data A and B and between D and E. The calculation results X and Y using E are stored (indicated by arrows in FIG. 4). In the case of the present embodiment, X = A × 0.5 + B × 0.
5, Y = D × 0.5 + E × 0.5. As a result, the enlargement magnification of individual image data after data conversion with respect to that before data conversion is 2.5 times for A, 2.5 times for B, and 2.0 times for C.
Times, D is 2.5 times, and E is 2.5 times.

In the image display device of the present embodiment,
Since the original image data is not lost at the time of data conversion, the same effect as that of the first and second embodiments that the contrast of the original image can be maintained can be obtained. Further, the magnification of each corresponding original image data after the interpolation processing with respect to each original image data before the interpolation processing is A, B, C,
2.5 times, 2.5 times, 2.0 times, and 2.
Since they are 5 times and 2.5 times, the maximum value of these magnifications (2.
The difference (0.5 times) between the minimum value (5 times) and the minimum value (2.0 times) is 20% of the maximum value. This makes it possible to maintain the average luminance of the original image before data conversion.

[Fourth Embodiment] Hereinafter, a fourth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating a form of data before and after data interpolation processing in the image display device according to the present embodiment. This embodiment is an example in which a video signal of the VGA specification is enlarged to a display panel for XGA at a conversion magnification of 1.6 times, similarly to the first and second embodiments. In the first to third embodiments, interpolation data is generated by an operation using data in one horizontal pixel line to increase the number of data. On the other hand, the image display device according to the present embodiment does not perform an operation on data within one horizontal pixel line, but instead adjoins one of two original image data adjacent to the allocation position of the interpolation data. Interpolation data is generated by switching between horizontal pixel lines. Note that, also in the present embodiment, the basic configuration of the image display device is the same as that shown in FIG. 1, and a description thereof will be omitted.

In the interpolation data calculation and generation circuit according to the present embodiment, as shown in FIG. 5, 640 image data per horizontal pixel line are divided into five data unit blocks A, B, C, D and E. Divided into Next, three storage locations for interpolation data are created in one block, and the number of data storage locations in one block is increased to eight. Then, the original image data A, B, C, D, and E are directly stored in the data allocation positions having the closest correlation to each of the original image data A, B, C, D, and E among the eight data storage locations. .

Next, the data X, Y, and Z corresponding to the three interpolated data allocation positions between A and B, between C and D, and between D and E, respectively, will be described. Either of the two original image data stored in the allocation positions adjacent to each allocation position is switched and stored by the adjacent horizontal pixel line of the video signal. That is, in the first horizontal pixel line, A is added to the interpolation data X, and
Is stored in the interpolation data Z, and D is stored in the interpolation data X in the second horizontal pixel line adjacent thereto.
Is stored in the interpolation data Y, and E is stored in the interpolation data Z. Similarly, in the subsequent horizontal pixel lines, the data contained in the interpolation data X, Y, and Z are stored in A and B, C and D, and D and E in the nth horizontal pixel line and the (n + 1) th horizontal pixel line adjacent thereto. (Figure 5
(Shown in the dashed-dotted frame P1).

In the case of the present embodiment, in the configuration of the image display device shown in FIG. 1, an arithmetic unit in the interpolation data operation generation circuit 5 is not necessary, but the interpolation data allocation position is set for each horizontal pixel line. What is necessary is just to change the selector control signal from the data number conversion circuit 4 to the interpolation data operation generation circuit 5 so as to control the selector so as to alternately switch the data to be accommodated.

In the present embodiment, unlike the first to third embodiments, the interpolation processing is not performed by calculating the data in one horizontal pixel line.
By performing an interpolation process for alternately switching data for each horizontal pixel line, the user sees X = A × 0.5 + B × 0.5, Y = C ×
This is equivalent to the calculation of 0.5 + D × 0.5 and Z = D × 0.5 + E × 0.5. Therefore, looking at the entire display panel on average, the enlargement magnification of each image data after data conversion before the data conversion is 1.5%.
, B is 1.5 times, C is 1.5 times, D is 2.0 times, and E is 1.5 times, which is the same as in the second embodiment.

In the image display device of the present embodiment,
Although the method of generating interpolation data is different from the first to third embodiments, it is the same as the above embodiment in that each original image data remains as it is, and loss of the original image data occurs during data conversion. Therefore, the same effect as that of the first to third embodiments that the contrast of the original image can be maintained can be obtained.

[Fifth Embodiment] Hereinafter, a fifth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 6 is a diagram showing the form of data before and after data interpolation processing in the image display device of the present embodiment. This embodiment is an example in which a video signal of the VGA specification is enlarged to an XGA display panel at a conversion magnification of 1.6 times, as in the fourth embodiment. However, in the fourth embodiment, the interpolation data is generated by switching one of the two original image data adjacent to the allocation position of the interpolation data by the adjacent horizontal pixel line. Is different in that interpolation data is generated by switching one of two original image data adjacent to the allocation position of the interpolation data for each frame constituting one screen. Note that, also in the present embodiment, the basic configuration of the image display device is the same as that shown in FIG. 1, and a description thereof will be omitted.

In the interpolation data calculation and generation circuit according to the present embodiment, as shown in FIG. 6, 640 pieces of image data per one horizontal pixel line are divided into five data unit blocks A, B, C, D and E. Divided into Next, three storage locations for interpolation data are created in one block, and the number of data storage locations in one block is increased to eight. Then, the original image data A, B, C, D, and E are directly stored in the data allocation positions having the closest correlation to each of the original image data A, B, C, D, and E among the eight data storage locations. .

Next, the data X, Y, and Z corresponding to the three interpolated data allocation positions between A and B, between C and D, and between D and E, respectively, will be described. Either of the two original image data stored in the allocation positions adjacent to each allocation position is switched and stored for each frame constituting one screen. That is, when focusing on any one horizontal pixel line, in the n-th frame, A is used for the interpolation data X, C is used for the interpolation data Y, and D is used for the interpolation data Z.
Is accommodated, the (n)
In the (+1) frame, the interpolation data X contains B, the interpolation data Y contains D, and the interpolation data Z contains E. In this manner, the data contained in the interpolation data X, Y, and Z is switched between A and B, C and D, and D and E on a frame-by-frame basis (shown in a dashed-dotted frame P2 in FIG. 6). .

In the case of the present embodiment, in the configuration of the image display device shown in FIG. 1, an arithmetic unit in the interpolation data operation generating circuit 5 is unnecessary, but the read enable signal input to the frame memory 1 is not required. The change enables switching of interpolation data for each frame.

In the case of the present embodiment, by performing an interpolation process such that data is alternately switched for each frame, the user sees X at the assigned position of the interpolation data, as in the fourth embodiment. = A × 0.5 + B × 0.5,
Y = C × 0.5 + D × 0.5, Z = D × 0.5 + E ×
This is equivalent to the calculation of 0.5 being performed. Therefore, when viewed averagely in the entire display panel, the enlargement ratio of individual image data after data conversion before data conversion is
A is 1.5 times, B is 1.5 times, C is 1.5 times, and D is 2.
0 times and E becomes 1.5 times. As a result, an effect similar to that of the above-described embodiment in that the contrast of the original image can be maintained can be obtained.

[Sixth Embodiment] Hereinafter, a sixth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 7 is a diagram illustrating a form of data before and after data interpolation processing in the image display device according to the present embodiment. In the first to fifth embodiments, the data expansion method in the horizontal direction has been exclusively described, but in the present embodiment, the data expansion method in the vertical direction will be described. In the image display device according to the present embodiment, the original image data is vertically enlarged at a conversion magnification of 1.6 times. Note that the basic configuration of the image display device is the same as in the first to fifth embodiments, and a description thereof will be omitted.

In the interpolation data calculation and generation circuit according to this embodiment, as shown in FIG.
After being divided into blocks of 5 horizontal pixel lines of C, D, and E, the number of data accommodating lines in one block is increased to 8 lines, and the original image data A, B,
C, D, and E are stored as they are (indicated by arrows in FIG. 7).
At this time, the original image data A, B, C, D, and E are accommodated in lines (data allocation positions) having the closest correlation to each of the original image data A, B, C, D, and E. At this time, when performing horizontal data expansion in addition to vertical data expansion, the frame memory 1 or the line memory 2
The horizontal data interpolation processing described in the above embodiment is performed by the interpolation data calculation generation circuit 5 using either one of the original image data.

Next, three lines containing interpolation data are:
Calculation results using the original image data A and B, C and D, D and E in two lines adjacent to each of these lines are stored as interpolation data. In the case of the present embodiment, the arithmetic expressions are A × 0.5 + B × 0.
5, C × (11/16) + D × (5/16), D × (5
/ 16) + E × (11/16). At this time, the interpolation processing in the vertical direction according to the above-described arithmetic expression is performed by the interpolation data arithmetic generation circuit 5 using the original image data of two lines in the line memory 2 and the frame memory 1 in which the data of the previous line is held. When the horizontal interpolation process is also performed, the horizontal data interpolation process described in the above embodiment is also performed. As a result of the interpolation process in the vertical direction, the enlargement magnification of the data of each line after data conversion with respect to the data before data conversion is 1.5 times for A, 1.5 times for B, and 1.
6875 times, D is 1.625 times, and E is 1.6875 times.

In the image display device of the present embodiment,
When performing the data interpolation process in the vertical direction, the lines of the original image data remain as they are, and no loss of the original image data occurs, so that the contrast of the original image can be maintained. In addition, the enlargement ratio of each corresponding original image data after the interpolation process with respect to each original image data before the interpolation process is A,
1.5 times, 1.5 times, 1.6 times for B, C, D and E, respectively
Since it is 875 times, 1.625 times, 1.6875 times,
The maximum value (1.6875 times) and the minimum value (1.
The difference value (5 times) (0.1875 times) is about 11% of the maximum value. This makes it possible to maintain the average luminance of the original image before data conversion.

The technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the sixth embodiment, when performing data interpolation processing in the vertical direction, arithmetic processing is performed collectively for each horizontal pixel line. Instead of this configuration, only one column of pixels (corresponding to "one vertical pixel column" in the claims and the means for solving the problem described above) arranged in the vertical direction is taken out, and the first to fifth embodiments are described. The same processing as the horizontal data interpolation processing may be performed. That is, a form in which interpolation data is generated by calculating two data based on two original image data accommodated in an allocation position vertically adjacent to the allocation position of the interpolation data. It is possible to adopt either a mode in which the data is switched to be interpolated data or a mode in which two data are switched for each frame to be interpolated data.

[0051]

As described above in detail, according to the image processing apparatus of the present invention, each of the original image data is stored so as to be left at the position closest to the correlation with each of the original image data. Is assigned to contain either one of the two adjacent original image data or the operation result of the two adjacent original image data, so that the data in the original image data is not subjected to the data interpolation processing as in the conventional method. The enlarged image can be displayed on the display panel while maintaining the contrast of the original image without any loss.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an image processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a form of data before and after interpolation processing of image data in the embodiment.

FIG. 3 is a diagram illustrating a form of data before and after interpolation processing of image data according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a form of data before and after interpolation processing of image data according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a form of data before and after interpolation processing of image data according to a fourth embodiment of the present invention.

FIG. 6 is a diagram illustrating a form of data before and after interpolation processing of image data according to a fifth embodiment of the present invention.

FIG. 7 is a diagram illustrating a form of data before and after interpolation processing of image data according to a sixth embodiment of the present invention.

FIG. 8 is a diagram illustrating a first example of a signal enlargement method in a conventional image display device.

FIG. 9 is a diagram showing a form of each signal in the first example.

FIG. 10 is a diagram illustrating a second example of a signal enlargement method in a conventional image display device.

[Explanation of symbols]

 1 frame memory 2 line memory 3 resolution discrimination circuit 4 data number conversion circuit 5 interpolation data calculation generation circuit 6 display panel

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/373 H04N 1/387 101 H04N 1/387 101 G06F 15/66 355C (72) Inventor Junichi Saito Miyagi 3-31, Akimitsu, Izumi-ku, Sendai, Japan F-term in Frontec Co., Ltd. (Reference) BB05 DD01 EE21 EE29 EE30 FF12 GG13 GG17 KK02 5C082 AA01 BA26 BA29 BA39 BB22 BB27 BB51 BC06 BC16 BC19 BD09 CA33 CA38 DA65 MM06 MM10

Claims (8)

[Claims] In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, one horizontal pixel line of the video signal is set when the number of horizontal pixels of the display panel is larger than the number of horizontal pixels of the video signal. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data calculation generation circuit that stores calculation results obtained from two original image data. 2. In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, when the number of horizontal pixels of the display panel is larger than the number of horizontal pixels of the video signal, one horizontal pixel line of the video signal is used. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data calculation generation circuit for storing any one of the original image data by switching between adjacent horizontal pixel lines of the video signal. 3. In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, when the number of horizontal pixels of the display panel is larger than the number of horizontal pixels of the video signal, one horizontal pixel line of the video signal is set. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data operation generation circuit that switches and accommodates any one of the two original image data for each frame constituting one screen. 4. In the interpolation data operation generation circuit,
The remaining data allocation position contains a result obtained by adding a value obtained by multiplying one of the two original image data by a coefficient and a result obtained by multiplying the other data by a coefficient. 2. The coefficients are set such that a difference between a maximum value and a minimum value of magnification of each corresponding original image data after interpolation processing on image data is 25% or less of the maximum value. The image display device as described in the above. 5. In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, one vertical pixel column of the video signal is set when the number of vertical pixels of the display panel is larger than the number of vertical pixels of the video signal. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data calculation generation circuit that stores calculation results obtained from two original image data. 6. In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, one vertical pixel column of the video signal is set when the number of vertical pixels of the display panel is larger than the number of vertical pixels of the video signal. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data operation generation circuit for storing any one of the two original image data by switching the adjacent image data by an adjacent vertical pixel column of the video signal. 7. In a display panel in which a predetermined number of horizontal pixels and a predetermined number of vertical pixels are respectively set, one vertical pixel column of the video signal is set when the number of vertical pixels of the display panel is larger than the number of vertical pixels of the video signal. Each of the original image data is accommodated as it is in a data allocation position closest to each of the plurality of original image data to be formed, and the remaining data allocation positions are accommodated in allocation positions adjacent to the allocation position. An image display device, comprising: an interpolation data operation generation circuit that switches and accommodates any one of the two original image data for each frame constituting one screen. 8. The interpolation data operation generation circuit,
The remaining data allocation position contains a result obtained by adding a value obtained by multiplying one of the two original image data by a coefficient and a result obtained by multiplying the other data by a coefficient. 6. The respective coefficients are set such that the difference between the maximum value and the minimum value of the magnification of each corresponding original image data after interpolation processing on the image data is 25% or less of the maximum value. The image display device as described in the above.