JPH1124629A - Display device for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease deterioration of clearness by cross talks, by displaying a picture, based on video data processed in vertical enhancement. SOLUTION: A vertical enhancement part 1 outputs video data R1 , G1 and B1 and a clock T1 obtained by processing an image data R, G and B in the vertical enhancement, from video data R, G and B and a clock T outputted from an A/D converting part 102, and from a synchronizing signal S outputted from a video processing part 101. A display-control part 103 generates gradation control data DATA and a discharge control signal CONT suitable for a display of PDP from the video data R1 , G1 and B1 and the clock T1 from the vertical enhancement part 1 and from the synchronizing signal S from the video processing part 101, and then outputs them. A PDP display part 105, into which the gradation control data DATA and the discharge control signal CONT from the display control part 103, and a high voltage VH for a discharge control from an power source 104 are inputted, displays in full colors corresponding to the inputted video signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PD using a plasma display panel (hereinafter referred to as "PDP").
More particularly, the present invention relates to a signal processing system having a function of performing enhancement processing on video data for the purpose of improving sharpness (sharpness) of a display screen.

[0002]

2. Description of the Related Art FIG. 12 is an explanatory view schematically showing a part of a conventional PDP display device. In FIG. 12, F _R ,
F shown _G, F Red _B is which is continuously applied in the longitudinal direction (vertical direction) in each in each discharge cell, a green, a phosphor for blue. Also, 119a, 120a, 119b, 120
b, 119c and 120c indicate electrodes, and electrodes 119a and 120a on the discharge cell e indicate the first scanning line and the discharge cells d
The upper electrodes 119b and 120b form a second scanning line, and the electrodes 119c and 120c on the discharge cell f form a third scanning line. Further, between discharge cells adjacent in the lateral direction (F _R ,
F _G, between) of each phosphor represented by F _B without partition wall (shown), but is present between the discharge cells adjacent in the vertical direction (e.g., in FIG. 12, the discharge cells e, d, and f There is no partition in (between).

[0003]

However, in the above-mentioned conventional PDP display device, since there is no partition wall between the vertically adjacent discharge cells, when the discharge cell d emits light, the light emission of the discharge cell d is reduced. Under the influence, mutual interference in which the emission intensity of the vertically adjacent discharge cells e and f slightly increases, that is, crosstalk occurs, which causes a problem that the sharpness of the displayed image is deteriorated.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to enhance the sharpness due to crosstalk by performing an emphasis process on video data. An object of the present invention is to provide a PDP display device capable of reducing deterioration.

[0005]

According to a first aspect of the present invention, there is provided a plasma display panel display device comprising: sampling means for converting a video signal into video data; receiving means for receiving the sampled video data; Display means for displaying an image, comprising: a vertical enhancement means for performing, on the video data, vertical enhancement processing for enhancing a vertical change of the video data, wherein the display means includes the vertical enhancement processing. An image based on the obtained video data is displayed on a plasma display panel.

According to a second aspect of the present invention, there is provided the plasma display panel display device according to the first aspect, wherein the vertical emphasis processing includes image data of a first target pixel to be emphasized;
The image processing is performed based on video data of a first adjacent pixel vertically adjacent to the first target pixel and a predetermined vertical enhancement coefficient.

In a third aspect of the present invention, the video data of the first target pixel is R _2, and the video data of the first adjacent pixel is R and R. ₃ and then, the v a predetermined vertical emphasis coefficient, the image data after the vertical enhancement when the _{R 1, R 1 = R 2} * (1 + 2v) -v * R-v * R 3 (1) 0 .1 ≦ v ≦ 1.0 (2).

According to a fourth aspect of the present invention, there is provided the plasma display panel display device according to any one of the first to third aspects, wherein interlaced scanning video data is progressively provided between the sampling means and the vertical emphasis means. It is characterized in that it is provided with a sequential scanning means for converting the image data into scanning format video data.

According to a fifth aspect of the present invention, there is provided the plasma display panel display device according to any one of the first to fourth aspects, wherein the video data and the video data are provided between the sampling means and the display means. A horizontal emphasis means for performing a horizontal emphasis process for emphasizing a change in a horizontal direction is provided.

According to a sixth aspect of the present invention, there is provided the plasma display panel display device according to the fifth aspect, wherein the horizontal emphasis processing includes image data of a second target pixel to be emphasized;
The image processing is performed based on video data of a second adjacent pixel horizontally adjacent to the second target pixel and a predetermined horizontal enhancement coefficient.

According to a seventh aspect of the present invention, in the plasma display panel display device according to the third aspect, a change in the horizontal direction of the video data is added to the video data between the sampling means and the display means. A horizontal emphasis unit for performing a horizontal emphasis process for emphasizing the video data of the second target pixel to be emphasized and a second adjacent pixel horizontally adjacent to the second target pixel in the horizontal direction. The processing is performed based on the video data and a predetermined horizontal enhancement coefficient. The video data of the second target pixel is set to _RH2 , the video data of the second adjacent pixel is set to _RH and _RH3 , and the predetermined horizontal When the enhancement coefficient is h and the horizontal enhancement data is R _H1 , R _H1 = R _H2 * (1 + 2h) −h * R _H −h * R _H3 (3) 0.1 ≦ h ≦ 1.0 ( 4) is satisfied.

The plasma display panel display device of claim 8 is characterized in that, in the device of claim 7, h <v (5) is satisfied.

According to a ninth aspect of the present invention, in the plasma display panel display device according to any one of the first to eighth aspects, a change in the video data is emphasized between the sampling means and the display means. And a gradation conversion means for converting the gradation characteristics of the video data into different gradation characteristics.

According to a tenth aspect of the present invention, there is provided a plasma display panel display device, comprising: a sampling means for converting a video signal into video data; a receiving means for receiving the sampled video data; and an image displayed on the plasma display panel. A display device, comprising: a gradation conversion unit configured to convert a gradation characteristic of the video data into a different gradation characteristic so as to emphasize a change in the video data. An image based on the video data gradation-converted by the conversion means is displayed on the plasma display panel.

According to a eleventh aspect of the present invention, in the plasma display panel display device according to the ninth or tenth aspect, the light emission luminance of the video data input to the gradation conversion means is reduced to the first light emission luminance which is low. And a second area having a higher light emission luminance than the first area, and a third area having a higher light emission luminance than the second area, the conversion processing by the gradation conversion means is performed. Reducing the light emission luminance of video data in the first area, increasing the dynamic range of light emission luminance in the second area,
The process is a process of increasing the light emission luminance of the video data in the region.

[0016]

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

Embodiment 1 FIG. 1 is a block diagram schematically showing a configuration of a PDP display device according to Embodiment 1 of the present invention.

As shown in FIG. 1, P
The DP display device has an input terminal 100 to which a composite video signal y / c is input, Y / C separation for the composite video signal y / c,
A video processing unit 101 that generates and outputs video signals r, g, b and a synchronization signal S by performing each process of chroma demodulation and matrix operation, and samples from the video signals r, g, b, and the synchronization signal S A / D converter 102 for generating and outputting the obtained video data R, G, B and clock T.

Further, the PDP display device according to the first embodiment
The video data R, G, output from the A / D converter 102,
B and the clock T, and the synchronization signal S output from the video processing unit 101, video data (vertical emphasis data) in which changes in the vertical direction of the video data R, G, and B are enhanced.
R _1, G _1, vertical emphasis unit 1 that outputs B ₁ and clock T ₁
Having.

Further, the PDP display device of the first embodiment uses the video data R ₁ , G ₁ , B ₁ and clock T ₁ from the vertical emphasizing unit ₁ and the synchronization signal S from the video processing unit 101 to generate a PDP. A display control unit 1 that generates and outputs gradation control data DATA and a discharge control signal CONT suitable for display.
And a power supply unit 104 that outputs a 5 V voltage supplied to each component and a high voltage VH for discharge control.

Further, the PDP display device according to the first embodiment has the gradation control data DATA from the display control unit 103.
And a discharge control signal CONT and a high voltage VH for discharge control from the power supply unit 104, and a PDP display unit 105 for performing full color display corresponding to the input video signal.
And a sequence control unit 106 for appropriately controlling the display operation of the entire system using a microcomputer or the like.

FIG. 2 shows the A / D converter 10 shown in FIG.
2 is a block diagram showing a configuration of FIG. As shown in FIG. 2, the A / D converter 102 includes A / D converters 107a and 107 for A / D converting the video signals r, g, and b, respectively.
b, 107c (in FIG. 2, each is referred to as “A / D
(1) "," A / D (2) ", and" A / D (3) ". ), And a PLL circuit 108 that generates and outputs a clock T from the horizontal synchronization signal H included in the synchronization signal S. The A / D conversion circuits 107a, 107b, and 107c generate video data R, G, and B sampled at the clock T from the video signals r, g, and b, respectively. The number of quantization bits of the video data R, G, B is 8 to 10 bits.

FIG. 3 is a block diagram showing the configuration of the vertical emphasis unit 1 shown in FIG. As shown in FIG. 3, the vertical emphasis unit 1 includes a delay unit 2 (denoted as “delay unit (A)” in FIG. 3) and a delay unit 3 (“delay unit (B)” in FIG. 3). ), A vertical coefficient generator 4, and a calculator 5 (referred to as "calculator (A)" in FIG. 3).
Arithmetic unit 6 (referred to as “arithmetic unit (B)” in FIG. 3)
, An operation unit 7 (in FIG. 3, referred to as “operation unit (C)”), and an adder 8.

The delay unit 2 outputs the video data R ₂ delayed by one scanning line time input video data. Delayer 3 outputs the video data R ₃ delayed by one scanning line time input video data. The vertical coefficient generator 4
An enhancement coefficient v for determining the degree of enhancement in the vertical direction is generated and supplied to each of the arithmetic units 5, 6, and 7. The calculator 5 outputs the input video data R and the calculated value −v * R of the enhancement coefficient v. The calculator 6 outputs the input video data R ₂ and the calculated value R ₂ * (1 + 2v) of the enhancement coefficient v. The arithmetic unit 7 calculates the calculated value −v of the input video data R ₃ and the enhancement coefficient v.
* And outputs the R _3. The adder 8 adds the output of the arithmetic unit 5, 6, 7, and outputs the calculated value R ₁ of the following formula (1).

R ₁ = R ₂ * (1 + 2v) −v * R−v * R ₃ (1) In the equation (1), when R ₂ = R = R ₃ (that is, when there is no change in the intensity in the vertical direction) In), the operation value R ₁ is equal to R. The value of the enhancement coefficient v is 0.1 ≦ v ≦ 1.0.
Degree, and is determined by the degree of crosstalk.
Further, the minus operation is equivalent to the differentiation, and has an effect of emphasizing a change in the high frequency component of the video data.

FIG. 3 relates to the red video data R. For the green video data G and the blue video data B, the video data is processed in parallel by a similar circuit, and the vertical emphasis processing is performed. Video data R ₁ , G ₁ , B
₁ can be output in parallel.

FIG. 4 shows the display control unit 103 shown in FIG.
FIG. 3 is a block diagram showing the configuration of FIG. This display control circuit 10
3 is a display input circuit 109 and a display memory circuit 110
, A memory 111 (referred to as “memory (1)” in FIG. 4), a memory 112 (referred to as “memory (2)” in FIG. 4), and a display output circuit 113.

The display input circuit 109 performs rearrangement processing of video data R ₁ , G ₁ , and B ₁ corresponding to the cell structure of the PDP and bit plane conversion processing for subfield gradation control based on pulse width modulation. The data D ₁ and the control clock CLK ₁ are output.

The display memory circuit 110 stores the data D ₁ in the memory 111 and the memory 11 for each field or frame.
2 and the control clock CL read from the data group of each bit plane in accordance with the subfield gradation control procedure in the next field or frame.
And it outputs the K _2.

The display output circuit 113 receives the data D2 and the control clock CLK _2, the subsequent PDP display unit 105
And a process of generating and outputting a discharge control signal CONT for the PDP in parallel.

FIG. 5 shows the PDP display unit 10 shown in FIG.
5 is a block diagram showing the configuration of FIG. As shown in FIG. 5, the PDP display unit 105 has a horizontal drive circuit 114, a horizontal connection line 115, a vertical drive circuit 116, a vertical connection line 117, and a PDP 118.

The horizontal drive circuit 114 is a 5V-system DATA
Amplitude converting the discharge control voltage VH _1. Horizontal connection line 11
5 supplies the discharge control voltage VH ₁ to each electrode of the PDP 118. The vertical drive circuit 116, amplitude converting the discharge control signal CONT of 5V system to a discharge control voltage VH _2. Vertical coupling line 117 supplies a discharge control voltage VH ₂ to each electrode of PDP118.

Here, the type of PDP 118 is VG
A (640 x 480 pixels), SVGA (800 pixels
× 600), XGA (1024 × 768 pixels), 16
There are 9 wide pixels 850 × 480.

Each pixel of the PDP 118 has three colors of red, green and blue.
It consists of two discharge cells. Then, for example, an emission luminance ratio of 1, 2, 4, 8, 16, 32, 64, 128 is added for each cell to realize a continuous gradation of 8 bits, thereby enabling full color display. Since each light emission luminance is realized by one subfield gradation control, for example, 256 gradations of full color can be realized in eight subfields.

Further, in the gradation control method, it is difficult to control light emission in units of scanning lines, and collective light emission control is performed in units of all scanning lines. Therefore, since the interlaced scanning method such as the current TV cannot be applied, the progressive scanning method is desirable.

As described above, the PD of the first embodiment
According to the P display device, the video data R _{2 of the} target pixel to be subjected to the vertical emphasis processing is compared with the video data R ₂ adjacent to the target pixel in the vertical direction.
Video data R of two adjacent pixels and a predetermined vertical enhancement coefficient R
₃ , the processing shown in the above equation (1), that is,
Since the processing for reducing the mutual interference in the vertical direction of the PDP display screen by the differential action of the vertical emphasis data is performed, the sharpness of the displayed image can be improved.

The vertical emphasis processing according to the above equation (1)
7 illustrates an example of an operation applicable to the vertical emphasizing unit 1 according to the first embodiment, and performs vertical emphasis by an operation using not only an adjacent pixel but also video data of a pixel further adjacent to the adjacent pixel (adjacent adjacent pixel). Processing may be performed. Further, another emphasis algorithm may be adopted.

Embodiment 2 FIG. 6 is a block diagram schematically showing a configuration of a PDP display device according to Embodiment 2 of the present invention.

The PDP display device according to the second embodiment has an A / D
A progressive scanning unit 9 that converts the interlaced scan format video data R, G, and B output from the conversion unit 102 to progressive scan format video data R ₄ , G ₄ , and B ₄ using a predetermined algorithm. Only the point with
This is different from the device of the first embodiment. The predetermined algorithm includes a method based on calculation, a method based on pattern matching, a method based on adaptive processing to video change, and the like.
In FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals.

In the second embodiment, the vertical emphasis unit 1
Emphasizes only the vertical change of the image in order to reduce the crosstalk of the PDP, and the vertical emphasis data R ₁ ,
The change in the horizontal direction and the change in the vertical direction of G ₁ and B ₁ themselves are unbalanced as compared with the original video data. If a predetermined algorithm for sequential scanning is applied to the unbalanced vertical emphasis data, erroneous determination of a change in video or the like occurs, and the expected interpolation performance cannot be obtained. Therefore, the sequential scanning unit 9
Need to be arranged before the vertical emphasis unit 1.

If the conversion to the progressive scanning format is not performed, jaggies (jaggies) occurring in the oblique outline portion of the video display screen are emphasized and noticeable. Therefore, according to the device of the second embodiment, it is possible to greatly reduce jaggy that occurs in the oblique outline portion of the video.

The other points of the apparatus of the second embodiment are the same as those of the first embodiment.

Third Embodiment FIG. 7 is a block diagram schematically showing a configuration of a PDP display device according to a third embodiment of the present invention.

In the PDP display device according to the third embodiment, the horizontal emphasis processing is performed on the video data R ₄ , G ₄ , B ₄ outputted from the sequential scanning section 9 to perform a horizontal emphasis process for emphasizing a change in the horizontal direction of the video data. Only the point that the unit 10 is provided is different from the second embodiment. In FIG. 7, the same components as those in FIG. 6 are denoted by the same reference numerals.

The horizontal emphasizing unit 10 shown in FIG. 7 converts each of the delay unit 2 and the delay unit 3 shown in FIG. 3 into a one-pixel delay circuit (specifically, a DFF circuit). This can be realized by a circuit in which the coefficient generator 4 is replaced with a horizontal coefficient generator. This horizontal emphasis processing is executed based on, for example, video data of a target pixel to be emphasized, video data of two adjacent pixels horizontally adjacent to the target pixel, and a predetermined horizontal emphasis coefficient.

Specifically, the video data of the target pixel is represented by R _H2
And the video data of the adjacent pixel horizontally adjacent to the target pixel is R _H and R _H3 , and the predetermined horizontal enhancement coefficient is h
When the horizontal emphasis data is R _H1 (corresponding to R ₅ in FIG. 7), R _H1 = R _H2 * (1 + 2h) −h * R _H −h * R _H3 (3) 0.1 ≦ h ≦ 1.0 (4) is satisfied.

Here, the necessity of the horizontal enhancement section 10 will be described. In a PDP, there are partitions between horizontally adjacent discharge cells, and horizontally adjacent cells are separated by partitions. Therefore, no crosstalk occurs between horizontally adjacent cells. But PD
The light emitting portion in each cell of P is formed with a finite area, and there is a disadvantage that the light emission intensity of the high frequency component is lower than the light emission intensity of the low frequency component with respect to ideal impulse light emission. Therefore, this problem can be solved by performing the process of enhancing the high frequency components of the video data by the horizontal enhancement process.

However, in the horizontal emphasis processing, since it is not necessary to consider the influence of crosstalk, the emphasis degree may be lower than the emphasis degree in the vertical direction. That is, the vertical emphasis coefficient v and the horizontal emphasis coefficient h satisfy the following equation (5): h <v (5).

The sequential scanning section 9 shown in FIG. 7 is not always necessary, and may be omitted if the apparatus is not required to have a function of reducing jaggies in the oblique outline of the image. Further, the horizontal emphasizing unit 10 may be arranged after the vertical emphasizing unit 1.

As described above, according to the apparatus of the third embodiment, it is possible to display a high-quality image with improved sharpness in both the horizontal and vertical directions.

The other points of the apparatus of the third embodiment are the same as those of the second embodiment.

Fourth Embodiment FIG. 8 is a block diagram schematically showing a configuration of a PDP display device according to a fourth embodiment of the present invention.

The PDP display device according to the fourth embodiment changes the gradation characteristics of the video data to different gradation characteristics so as to emphasize changes in the video data R ₁ , G ₁ , and B ₁ output from the vertical emphasis unit 1. Only the point that a tone conversion unit 11 for conversion is provided is different from the third embodiment. In FIG. 8, the same components as those in FIG. 7 are denoted by the same reference numerals.

The gradation conversion section 11 is composed of, for example, three ROMs 12a, 12b and 12c as shown in FIG. 9, and independently converts the vertically emphasized video data R ₁ , G ₁ and B ₁ into gradations. Table conversion is performed to emphasized video data R ₆ , G ₆ , and B ₆ .

FIG. 10 is an input / output characteristic diagram of table conversion. In the figure, the horizontal axis indicates input, ie, video data R ₁ , G ₁ , B ₁ , and the vertical axis indicates output, ie, video data R ₆ , G ₆ , B ₆ . In the drawing, a solid line indicated by a solid line indicates a case where gradation conversion is not performed, and each of broken lines m and n indicates a case where gradation conversion for improving sharpness is performed.

As shown in FIG. 10, for example, the light emission luminance of the video data R ₁ input to the gradation conversion unit 11 is changed into a first area W ₁ having a low light emission luminance and a first area W _1. A second region W ₂ having a higher emission luminance than the second region W ₂
When the image data is divided into the _third area W ₃ having a higher light emission luminance, the conversion processing by the gradation conversion unit 11 lowers the light emission luminance of the video data in the first area W ₁ and emits light in the second area W ₂ . increasing the dynamic range of luminance (the steep dashed gradient in FIG. 10), performs a process of increasing the light emission luminance of the video data in the third region W _3.

In other words, the number of gradations of video data in the vicinity of 0 where the light emission intensity is low (area W ₁ ) and in the vicinity of 1 where the light emission intensity is high (area W ₃ ) is compressed, and the intermediate intensity (area W ₂ ) is compressed. Conversion characteristics such as conversion for increasing the number of tones (S-character correction) are performed. Note that the visual sharpness can be further improved in the case of the broken line m than in the case of the broken line n. However,
It is necessary to suppress the improvement of the sharpness to such an extent that the display screen does not feel strange.

In the emphasis calculation of the horizontal emphasis unit 10 and the vertical emphasis unit 1, the horizontal and vertical contours of the video are extracted and added to the original data, and data not in the original data is generated by the operation. There is a drawback that the display quality becomes glaring if emphasized too much. However, the improvement in visual sharpness by gradation conversion merely changes the appearance position (combination of subfields to emit light) of each gradation, and the relative gradation relationship is not reversed. Absent. In addition, there is no directionality such as horizontal or vertical in improving visual sharpness by gradation conversion.

Therefore, the present invention is not limited to the apparatus shown in FIG. 8 in which the sharpness is improved by using the gradation converting unit 11, the vertical emphasizing unit 1, and the horizontal emphasizing unit 10 together. It is also possible to use a device for improving the sharpness or a device for improving the sharpness by using the gradation conversion unit 11 and the vertical emphasis unit 1 together. Which device is to be selected can be appropriately selected based on the performance, economy, and the like required of the device.
Further, when at least one of the vertical emphasis unit 1 and the horizontal emphasis unit 10 is used, each emphasis coefficient can be made smaller than in the case where the gradation conversion unit 11 is not used.

As described above, the PD of the fourth embodiment
According to the P display device, it is possible to display an image with visually improved sharpness by changing the appearance distribution of each gradation.

The gradation conversion section 11 is not limited to the one configured by the ROM, but may be a table conversion using a memory such as an SRAM or a logic conversion circuit. Except for the points described above, the device of the fourth embodiment is the same as the device of the third embodiment.

Fifth Embodiment FIG. 11 is a block diagram schematically showing a configuration of a PDP display device according to a fifth embodiment of the present invention.

The PDP display device according to the fifth embodiment comprises a personal computer image signals r, g, b and a synchronization signal S.
And displays it on the PDP. The device of the fifth embodiment is
The apparatus is the same as the apparatus of the fourth embodiment shown in FIG. 8 except that the video processing unit 101 and the sequential scanning unit 9 are omitted. In FIG. 11, the same reference numerals are given to the same or corresponding components as those in FIG.

According to the device of the fifth embodiment, when the PDP is used as a display unit of a personal computer,
The sharpness of an image can be increased.

The present invention can be applied to all PDP display devices using a PDP, such as a PDP television device or a PDP monitor device.

[0066]

According to the first aspect of the present invention, the sharpness in the vertical direction is improved by performing the vertical emphasizing process, so that the reduction in the sharpness due to the crosstalk in the vertical direction can be reduced. Can be

According to the second aspect of the present invention, the video data of the first target pixel to be emphasized, the video data of the first adjacent pixel vertically adjacent to the first target pixel, and
Since the vertical emphasis processing is performed based on the predetermined vertical emphasis coefficient, it is possible to reduce the reduction in sharpness due to crosstalk in the vertical direction.

According to the third aspect of the present invention, the reduction in sharpness due to crosstalk in the vertical direction can be reduced by a simple arithmetic processing that satisfies the above (1) and (2). Is obtained.

According to the fourth aspect of the present invention, since the sequential scanning means is provided, it is possible to suppress the occurrence of jaggies in the outline portion of the image.

According to the fifth aspect of the present invention, since the horizontal emphasizing means for performing the horizontal emphasizing process is provided between the sampling means and the display means, high-quality sharpness in the horizontal direction is improved. An effect that an image can be displayed is obtained.

According to the sixth aspect of the present invention, the video data of the second target pixel to be emphasized, the video data of the second adjacent pixel vertically adjacent to the second target pixel, and
Since the horizontal emphasis processing is performed based on the predetermined vertical emphasis coefficient, an effect that a high-quality image with improved horizontal sharpness can be displayed can be obtained.

According to the seventh aspect of the present invention, it is possible to display a high-quality image in which the sharpness in the horizontal direction is also improved by a simple arithmetic processing for satisfying the above (3) and (4). The effect that it can be obtained is obtained.

According to the eighth aspect of the present invention, since the degree of horizontal emphasis is made smaller than the degree of vertical emphasis, the sharpness in the vertical and horizontal directions can be well balanced. Is obtained.

According to the ninth aspect of the present invention, it is possible to reduce a decrease in sharpness due to mutual interference between cells, and to visually sharpen the image by means of a gradation converting means provided between the sampling means and the display means. The effect that the degree can be improved can be obtained.

According to the tenth aspect of the present invention, since the gradation conversion means is provided between the sampling means and the display means, the effect of improving the visual sharpness can be obtained. .

Further, according to the eleventh aspect of the present invention, the effect that the visual sharpness can be improved by the gradation converting means can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a PDP display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an A / D converter in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a vertical emphasis unit in FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of a display control unit in FIG. 1;

FIG. 5 is a block diagram illustrating a configuration of a PDP display unit in FIG. 1;

FIG. 6 is a block diagram showing a configuration of a PDP display device according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a PDP display device according to a third embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a PDP display device according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration of a gradation conversion unit in FIG. 8;

FIG. 10 is a characteristic diagram illustrating characteristics of the gradation conversion unit in FIG. 9;

FIG. 11 is a block diagram showing a configuration of a PDP display device according to a fifth embodiment of the present invention.

FIG. 12 is a diagram showing a detailed configuration of a conventional PDP display unit.

[Explanation of symbols]

1 vertical emphasis unit, 2 delay unit (A), 3 delay unit (B), 4 vertical coefficient generator, 5 arithmetic unit (A),
6 arithmetic unit (B), 7 arithmetic unit (C), 8 adder, 9 sequential scanning unit, 10 horizontal emphasis unit, 11
Gradation converter, 12 ROM, 100 video input terminal, 101 video processor, 102 A / D converter,
103 display control unit, 104 power supply unit, 105
PDP display unit, 106 sequence control unit, 107
a, 107b, 107c A / D conversion circuit, 108
PLL circuit, 109 display input circuit, 110 display memory circuit, 111 memory (1), 112 memory (2), 113 display output circuit, 114 horizontal drive circuit, 115 horizontal connection line, 116 vertical drive circuit, 117 vertical connection line, 118 PDP.

Claims (11)

[Claims] 1. A plasma display panel display device comprising: sampling means for converting a video signal into video data; receiving means for receiving sampled video data; and display means for displaying an image on a plasma display panel. In the above, the video data, comprising a vertical emphasis means for performing vertical emphasis processing for emphasizing the vertical change of the video data, the display means, the plasma display panel to display an image based on the video data subjected to the vertical emphasis processing A plasma display panel display device characterized in that a display is performed on the display. 2. The image processing method according to claim 1, wherein the vertical emphasis processing includes a video data of a first target pixel to be emphasized, a video data of a first adjacent pixel vertically adjacent to the first target pixel, and a predetermined vertical emphasis. 2. The plasma display panel display device according to claim 1, wherein the display is executed based on the coefficient. 3. The video data of the first target pixel is represented by R ₂
When the video data of the first adjacent pixel is R and R ₃ , a predetermined vertical enhancement coefficient is v, and the video data after the vertical enhancement processing is R ₁ , R ₁ = R ₂ * ( _3. The plasma display panel display device according to claim 2, wherein (1 + 2v) -v * R-v * R3 (1) satisfies 0.1 ≦ v ≦ 1.0 (2). 4. A method according to claim 1, further comprising a sequential scanning means for converting interlaced scanning video data into progressive scanning video data between said sampling means and said vertical emphasis means. 4. The plasma display panel display device according to any one of items 1 to 3. 5. A horizontal emphasis means for performing a horizontal emphasis process for emphasizing a horizontal change of the video data on the video data between the sampling means and the display means. The plasma display panel display device according to claim 1. 6. The video data of a second target pixel to be emphasized in the horizontal emphasis processing, video data of a second adjacent pixel horizontally adjacent to the second target pixel, and a predetermined horizontal emphasis 6. The plasma display panel display device according to claim 5, wherein the processing is performed based on the coefficient. 7. A horizontal emphasis means for performing horizontal emphasis processing for emphasizing a horizontal change of the video data on the video data between the sampling means and the display means, wherein the horizontal emphasis processing is performed. Is executed based on video data of a second target pixel to be enhanced, video data of a second adjacent pixel horizontally adjacent to the second target pixel, and a predetermined horizontal enhancement coefficient. The video data of the target pixel 2 is set to R _H2 ,
The image data of the adjacent pixel is R _H and R _H3, a predetermined horizontal emphasis coefficient is h, the horizontal emphasis data when the _{R H 1, R H1 = R} H2 * (1 + 2h) -h * R H The plasma display panel display device according to claim 3, wherein -h * R _H3 (3) satisfies 0.1 ≦ h ≦ 1.0 (4). 8. The plasma display panel display according to claim 7, wherein h <v (5) is satisfied. 9. A gradation conversion means for converting a gradation characteristic of the video data to a different gradation characteristic between the sampling means and the display means so as to emphasize a change in the video data. The plasma display panel display device according to any one of claims 1 to 8, wherein: 10. A plasma display panel display device comprising: sampling means for converting a video signal into video data; receiving means for receiving sampled video data; and display means for displaying an image on a plasma display panel. In the above, there is provided a gradation conversion means for converting a gradation characteristic of the video data to a different gradation characteristic so as to emphasize a change in the video data, wherein the display means is gradation-converted by the gradation conversion means. A plasma display panel display device for displaying an image based on video data on a plasma display panel. 11. A light emitting luminance of video data input to said gradation converting means, wherein a first area having a lower light emitting luminance, a second area having a higher light emitting luminance than said first area, and When the image is divided into a third region having a higher light emission luminance than the second region, the conversion processing by the gradation conversion means lowers the light emission luminance of the video data in the first region and reduces the light emission luminance in the second region. Increase the dynamic range of
11. The plasma display panel display device according to claim 9, wherein the process is a process of increasing a light emission luminance of the video data in the third area.