JPH06276463A - Pdp display device - Google Patents

Abstract

PURPOSE:To use a frame memory required for picture element number conversion and a video data storage frame memory provided to the display device using a plasma display panel(PDP) in common. CONSTITUTION:The display device is provided with a 1st frame memory 4 storing video data as data for each frame, a conversion matrix 5 converting a picture element number of the data for each frame into a required picture element number, a 2nd frame memory 6 storing picture data whose picture element number is converted from the conversion matrix 5 as data for each frame to read out the data for each line, and a picture element number conversion control section 7 controlling the 1st frame memory and the 2nd memory and the conversion matrix to allow them to convert the picture element number into the required picture element number, and number of picture elements of the video data for each frame stored in the 1st frame memory 4 is converted into a required picture element number and it is read from the 2nd frame memory 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PDP display device in which a frame memory for storing image data provided in a display device using a PDP (plasma display panel) and a frame memory required for pixel number conversion are shared. .

[0002]

2. Description of the Related Art FIG. 3 is a view showing the concept of the relationship between a conventional PDP display device body 31 and a pixel number converter (hereinafter referred to as "pixel converter") 32. As shown in the figure, in the PDP display device main body 31,
A frame memory 1a is provided, and data for one frame of a video signal is temporarily stored in the frame memory 1a before driving the PDP 1b.
Then, the data for one line is read out at one time when the PDP is driven and sent to the PDP 1b for display. On the other hand, in the pixel converter 32, which is independent of the PDP display device main body, a frame memory 2a for accumulating data for one frame of a video signal before pixel number conversion (hereinafter referred to as "pixel conversion") and a pixel memory after the same conversion. A frame memory 2b for accumulating data is provided to perform a predetermined pixel conversion. And the pixel converter
The data after the pixel conversion by 32 becomes an input signal of the PDP display device main body. The three memories mentioned above are of the same type.

[0003]

Therefore, according to the conventional method (FIG. 3)
Requires three independent frame memories of the same type. The present invention provides a PDP display device in which each frame memory for video data storage and pixel converter is shared, and the number of frame memories is reduced by processing video data storage and pixel conversion in one device. The purpose is to do.

[0004]

According to the present invention, there is provided a first frame memory for storing video data as data for each frame, and a conversion matrix for converting the number of pixels of the data for each frame into a required number of pixels. The second frame memory, which stores the video data in which the number of pixels is converted from the conversion matrix as data for each frame and is read for each line, the first frame memory, the second frame memory, and the conversion matrix A pixel number conversion control unit that controls and converts the pixel number into a required number of pixels, and converts the number of pixels of the video data for each frame to be stored in the first frame memory into a required number of pixels. The present invention provides a PDP display device which can be read from a frame memory.

[0005]

After the video data is stored in the first frame memory,
The conversion matrix and the pixel number conversion control unit convert the pixel number to a required number and store it in the second frame memory. The data stored in the second frame memory is read line by line and sent to the PDP.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A PDP display device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a PDP according to the present invention.
FIG. 2 is a block diagram of a main part showing an embodiment of a display device, and FIG. 2 is an explanatory diagram of pixel conversion. In FIG. 1, reference numeral 1 is a color controller for performing a predetermined process on input RGB video data (three primary color video data), etc.
Is a controller 3 for writing RGB image data and the like
Data controller 3 for sending data from the data controller 2 to the first frame memory 4, 4 is a first frame memory for storing (accumulating) RGB video data for each frame, and 5 is a frame A conversion matrix for converting the number of pixels of the video data for each frame, 6 is a second frame memory for storing (accumulating) the video data from the conversion matrix 5 for each frame, and 7 is a conversion between the first and second frame memories. A pixel number conversion (pixel conversion) control unit for controlling the matrix 5 and performing a predetermined pixel number conversion;
Is a data read controller for reading the data written in the second frame memory 6 line by line, 9 is a memory controller for controlling the first and second frame memories, and 10 is a data read controller 1
Plasma display panel with data for each line 11
Is a plasma display panel (PDP).

Next, the operation of the present invention will be described. In addition to digitally sampled RGB video data (eg, 8-bit data), the color controller 1 also has vertical synchronization (VSYNC), horizontal synchronization (HSYNC), clock (CLK
), Blanking (BLNK) and other digital data are input. The color controller 1 performs predetermined signal processing such as correction of brightness, contrast and color balance on the input video data. The processed video data is sent to the data write controller 3 via the data controller 2, the timing and the like are controlled by the controller 3, and the video data is written to the first frame memory 4. The video data written in the first frame memory 4 is subjected to pixel conversion as follows. Hereinafter, a specific method example will be described with reference to FIG. Now, if the number of pixels of video data for each frame is 1024 x 768 (dots) and this is pixel-converted into video data with the number of pixels of 640 x 480 (dots), it is only necessary to compress the height and width to 5/8. become. A two-dimensional filter is used to perform this compression digitally, and is performed as follows.

First, video data of 1024 × 768 (dots) is subdivided into blocks of 8 × 8 dots (FIG. 2A). This creates 128 blocks horizontally and 96 blocks vertically. This state is shown in FIG. Pixel conversion is performed by using two weighted matrices for converting each block into a block of 5 × 5 dots (B in FIG. 2B) (conversion matrix 5). That is, 8 × 8
If a block of dots is converted to a block of 5 × 5 dots and it is repeated 12,288 times, which is the product of vertical and horizontal blocks (128 × 96), it can be converted to video data consisting of 640 × 480 (dots) pixels. it can. The pixel conversion control unit controls this conversion. The state after the pixel conversion is shown in FIG. The video data after the pixel conversion is written in the second frame memory 6.
The data written in the second frame memory 6 is read by the data read controller 8 and the data is sent to the driver controller 10. The controller 8 uses the sent one line of video data as the video data D1, drive data D2 and scan data D3.
The data is sent to the DP8, and the PDP8 displays an image based on these data.

[0009]

As described above, according to the present invention, the frame memory for storing image data and the frame memory required for pixel number conversion (pixel converter) can be shared, and the image data can be stored in one device. And pixel conversion processing becomes possible. Moreover, since the number of memories used is reduced by this sharing, the circuit configuration is simplified and the cost can be reduced. Further, as described above, the number of times of DA conversion and AD conversion processing is reduced as compared with the case where the pixel converters are independent, so that it is possible to prevent image quality deterioration due to the conversion processing and improve image quality.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part showing an embodiment of a PDP display device according to the present invention.

FIG. 2 is an explanatory diagram of pixel conversion.

FIG. 3 is a conceptual diagram showing a relationship between a conventional pixel number converter and a PDP display device body.

[Explanation of symbols]

 1 Color Controller 2 Data Controller 3 Data Write Controller 4 First Frame Memory 5 Conversion Matrix 6 Second Frame Memory 7 Pixel Conversion Controller 8 Data Readout Controller 9 Memory Controller 10 Driver Controller 11 Plasma Display Panel (PDP)

Claims (1)

[Claims] 1. A first frame memory for accumulating video data as data for each frame, a conversion matrix for converting the number of pixels of the data for each frame into a required number of pixels, and a number of pixels from the conversion matrix. A second frame memory that stores the converted video data as data for each frame and is read for each line;
And a second frame memory and a pixel number conversion control unit for controlling the conversion matrix to convert the number of pixels to a required number of pixels, and the number of pixels of video data for each frame accumulated in the first frame memory A PDP (plasma display panel) display device, characterized in that it is converted into a required number of pixels and read from the second frame memory.