JP2000322024A - Driving method and device for plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display device reducing power consumption for writing operation line image data. SOLUTION: A plasma display device 30 is provided with a plasma display part 1 including a scan line part 6 and a data line part 5, a scan driver means 7 selecting one scan line from the scan line part 6, a scan controller means 8, a register part for line image data for writing 3 having bit parts connected to individual data lines in the data line part 5, and an image data buffer means 2 latching line image data for one frame. A second line image data candidate storing register 31 is provided to store line image data constituting other multiple lines different from first line image data currently being written into a certain scan line 6 as a candidate of second line image data written into the plasma display after the first line image data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plasma display driving method and a plasma display device, and more particularly, to a plasma display driving method and a plasma display device for reducing power consumption.

[0002]

2. Description of the Related Art Many techniques have been disclosed as conventional plasma display driving methods or plasma display devices.

For example, as shown in FIG. 2, a conventional plasma display device 20 includes a plasma display unit 1 having a scan line unit 6 and a data line unit 5,
Scan driver means 7 for selecting a plurality of scan lines constituting the scan line section 6, scan controller means 8 for controlling the scan driver means,
A write line image data register unit 3 having a bit unit 10 connected to each of a plurality of data lines constituting the data line unit 5 via a high voltage buffer unit 4;
It comprises an image data buffer means 2 for retrieving and latching one frame of line image data from an appropriate image data storage means (not shown) and a control means 9 for comprehensively controlling each of the above means.

In such a conventional plasma display device, one horizontal line is sequentially read from one line of line image data temporarily stored in the image data buffer means 2 in the order of line scan numbers. Is latched in the write data register 3 and, for example, the line image data is stored in the activated line scan number position by the scan controller 8 via the high-voltage buffer means 4. It is configured to write to each of the lines 5.

That is, in the conventional plasma display device, the line image data for one frame is written in the plasma display unit 1 in the order of the horizontal line number. Each time line image data is written, the charge of each data line 5 is charged and discharged. Therefore, the charge and discharge cycle is increased, and the power consumption of each data line 5 is increased because the wiring capacity of each data line 5 is also high. There was a problem.

That is, if the number of writing operations (charging and discharging) of each pixel is large for driving a high-voltage and capacitive load, the power consumption increases in proportion to the number of writing operations.

Japanese Patent Application Laid-Open No. 7-99461 discloses that a circuit for performing PSK demodulation and PCM demodulation, a D / A converter, and a low-pass filter circuit used in an audio reproduction circuit for satellite broadcasting and the like are provided on the same chip. Although a description is given with respect to the formed integrated circuit, no disclosure or suggestion is found regarding the method of driving the PDP.

[0008]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve the above-mentioned drawbacks of the prior art and to reduce the power consumption in a line image data writing operation in a plasma display device. A display device and a plasma display driving method are provided.

[0009]

The present invention employs the following technical configuration to achieve the above object.

That is, as a first aspect according to the present invention,
In the plasma display device, the first line image data currently being written to the predetermined first line of the plasma display unit in all the image data constituting one frame corresponds to the first line image data. Converts other line image data constituting a plurality of different other lines into the first line image data.
The second line image data to be written into the plasma display after the line image data of the above is extracted as a plurality of other line image data candidates, and each of the plurality of extracted line image data candidates is First
Calculating the degree of coincidence with the first line image data, and writing the other line image data having the greatest degree of coincidence with the first line image data into the plasma display next to the first line image data. And the second line image data is written to a predetermined line in the plasma display according to the second aspect of the present invention. As an aspect, a plasma display unit having a scan line unit and a data line unit, a scan driver unit for selecting a plurality of scan lines constituting the scan line unit, a scan controller unit for controlling the scan driver unit, the data unit Bits connected to each of the multiple data lines that make up the line section In a plasma display apparatus comprising a write line image data register unit having the following and image data buffer means for latching one frame of line image data, a current write operation is performed on a predetermined first line of the plasma display unit. With respect to the first line image data therein, other line image data constituting a plurality of other lines different from the first line is written to the plasma display after the first line image data. This is a plasma display device provided with a second line image data candidate storage register for storing as a second line image data candidate for use.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The plasma display device and the plasma display driving method according to the present invention employ the above-described technical configuration. In order to write line image data by selecting line image data as a candidate for the next line image data to be written next, in which the data fluctuation is small with respect to the line image data, and thus the number of times of charging and discharging to the capacitive load is reduced. With the configuration, it is possible to effectively reduce power consumption.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a plasma display device according to the present invention.

FIG. 1 is a cross-sectional view for explaining the outline of the configuration of a specific example of the plasma display device 30 according to the present invention. In FIG. 1, a plasma display device having a scan line section 6 and a data line section 5 is shown. A display unit 1, a scan driver unit 7 for selecting one scan line from a plurality of scan line groups constituting the scan line unit 6, a scan controller unit 8 for controlling the scan driver unit 7, and a data line unit 5. A write line image data register unit 3 having a plurality of bit units 10 connected to each of a plurality of constituent data lines;
And the image data buffer means 2 for latching the line image data of one frame, the first data currently being written to the predetermined first scan line 6 of the plasma display unit 1 in the plasma display device 30.
The second line image data for writing a plurality of other line images different from the first line into the plasma display after the first line image data with respect to the line image data of 2 shows a plasma display apparatus provided with a second line image data candidate storage register 31 for storing the line image data candidates.

The second line image data candidate storage register 31 is provided with a plurality of individual line image data storage registers in parallel. At least two types of second line image data candidate storage registers 32 are provided. , 33 are preferably provided.

In the first register unit 32 of the second line image data candidate storage register 31 according to the present invention,
The n-th second line image data candidate extracted as the plurality of types of second line image data is stored, and the second register unit 33 stores the plurality of types of second line image data.
Is stored so that the m-th second line image data candidate extracted as the line image data is stored.

That is, in the present invention, one frame (first image) extracted from the appropriate image data storage means 21 is used.
The line image data from the first line scan to the x-th line scan is temporarily stored in the image data buffer unit 2, and an arbitrary horizontal line scan number (for example, line scan The line image data having the number (first line image data) is selected as the first line image data, and is first temporarily stored in the first line image data write register 3, and the first line image data write register 3 In response to the line scan number of the selected arbitrary first line image data, for example, the high-speed buffer 4 as shown in FIG. The line scan activated by the controller means 8 via the scan driver 7. Write to the scan line 6 with a number.

While the first line image data is being written to the selected line scan 6, the data selection unit 25 latches the one frame of line image data by the data selection unit 25.
From the line image data group for one frame stored in
Any line scan number except for the line image data currently being written (for example, n-th, m-th, excluding the line image data having the first line scan number)
At least two types of line image data having the line image data having the x-th line scan number) as the second line image data after the writing operation of the first line image data is completed. A first line image data candidate for writing is selected as a line image data candidate for writing, and the first register 3
2 and 33 are individually stored.

In the present invention, the line scan numbers of a plurality of types of line image data selected as the second line image data candidates are arbitrary, and line image data having continuous line scan numbers is selected. Or may be randomly selected.

Preferably, it is efficient to select from a group of line scan numbers within a certain range, but it is not necessarily restricted to this.

That is, in the present invention, the number of a plurality of types of line image data selected as the second line image data candidates is determined by the register provided in the second line image data candidate storage register 31. It is necessary to match the number.

In the following description, the second line image data candidate storage register 31 is provided with a first register 32 and a second register 33 for storing two second line image data candidates. However, the present invention is not limited to such a configuration.

The plasma display unit 1 in the plasma display device 30 used in the present invention.
Is not particularly limited, and a conventionally known plasma display unit can be used.

In the specific example of the present invention, the first line image data being written is stored in the registers 32 and 33 of the second line image data candidate storage register 31 respectively. Each bit constituting both line image data is calculated using the coincidence degree calculating means 22 for calculating the degree of coincidence between each of the plurality of types of stored second line image data candidates and the first line image data. From the state, the degree of coincidence between the two line image data is determined, and from the degree of coincidence information calculated by the degree of coincidence calculation means 22, the first line image data is compared with the first line image data by the comparison operation means 26. The other line image data (second line image data candidate) having the highest degree of coincidence with the first line image data is placed next to the plasma display. Written in which are configured so as to select as the second line image data.

More specifically, the matching degree calculating means 22 in the present invention extracts all the data bits constituting the first line image data and extracts the data bits as candidates for the second line image data. It is preferable that all the corresponding data bits of the respective line image data are compared with each other. More specifically, the matching degree calculating means 22 is configured to compare the first line currently being written. Among all the bits constituting the image data and the n-th line image data among the plurality of types of line image data which are candidates for the second line image data, each bit corresponding to each other is compared. Exclusive OR (Ex-O
R) circuit 23-1 and an addition circuit 24-1 for adding the operation value of each bit by the exclusive OR (Ex-OR) circuit 23-1.
It is preferable that the arithmetic processing is performed in step 1 to calculate the degree of coincidence of the line image data between the two.

Similarly, the first line image data currently being written and the m-th line image data among a plurality of types of line image data which are candidates for the second line image data are respectively formed. Exclusive OR (Ex-O) for comparing bits corresponding to each other among all bits
R) circuit 23-2, and an addition circuit 24-2 for adding the operation value of each bit by the exclusive OR (Ex-OR) circuit 23-2.
It is preferable that the arithmetic processing is performed in step 2 to calculate the degree of coincidence of the line image data between the two.

Finally, the adders 24-1 and 24-2
And a total number comparing means 26 for comparing the degree-of-coincidence calculation values output from the first and second line image data by the total number comparing circuit 26. Type of line image data (the line image data of the nth line scan number and the mth
The second line image data candidate having the largest matching degree with the first line image data is determined from the plurality of types of matching degree data calculated with each of the line image data of the first line scan number). It is desirable to configure so that it can be selected.

In the present invention, when the writing of the first line image data is completed, the above-described method is used.
The selected line image data as the second line image data candidate is stored in the write line image data register unit 3 and the write operation is started, and at the same time, another line scan is performed by the data selection unit 25. A plurality of types of line image data having numbers are newly selected and individually stored in the first and second second line image data candidate storage registers 32 and 33.

That is, in the present invention, the first line image data is initially stored in the write data register 3, and the line image data which is a candidate for the second line image data is stored in the write data register 3. After the selection and determination, the first line image data stored in the write data register 3 is configured to be replaced with the second line image data.

As described above, in the present invention, each line image data is written between the first line image data currently being written and the second line image data to be written next. It is determined whether or not each of the constituent bits matches each other. The greater the number of matching bits, the more the number of charge / discharge operations when writing line image data to the data lines 5 of the plasma display. As described above, as described above, the line image data having a high degree of coincidence with the first line image data currently being written is written after the writing operation of the first line image data. The line image data is written by changing the order of the line scan numbers so that the line image data is selected as the second line image data.

That is, as a feature of the present invention, the writing order of the data in the horizontal line scanning is changed so that the variation of the data, that is, the number of times of charging and discharging is reduced, ignoring the line scanning number, and The data is written by rearranging the line scan order.

Thereafter, the above operation is repeated, and after writing a frame of line image data for one frame, a light emitting operation is executed to display an image.

As a result, in the present invention, the number of times of charging / discharging at the time of data writing in the plasma display device is reduced, so that the power consumed by the load capacitance of the pixel can be significantly reduced.

Next, a plasma display driving method according to another embodiment of the present invention will be described. As is clear from the above description, the plasma display driving method according to the present invention basically includes: It has the following configuration.

That is, in the plasma display device 30, with respect to the first line image data currently being written to the predetermined first line of the plasma display unit in all the image data constituting one frame, A plurality of other line image data constituting a plurality of other lines different from the first line is written as a second line image data for writing to the plasma display after the first line image data. It is extracted as another line image data candidate, the degree of coincidence between each of the plurality of extracted line image data candidates and the first line image data is calculated, and the degree of coincidence with the first line image data is calculated. A second line image that writes the other line image data having the largest value to the plasma display next to the first line image data. Selected as over data, to the plasma display of at predetermined lines, those which are configured so as to write the second line image data.

In the plasma display driving method according to the present invention, at least two types of line image data are written as the second line image data after the first line image data write operation. It is desirable that the line image data is selected as a candidate for the line image data.

Further, in the plasma display driving method according to the present invention, the calculation of the degree of coincidence in the plurality of different types of line image data is performed on all data constituting the first line image data. It is also preferable that the configuration is such that the bits and all the corresponding data bits of the respective line image data extracted as candidates for the second line image data are compared.

Further, in the plasma display driving method according to the present invention, the plurality of types of line image data which are candidates for the first line image data and the second line image data which are currently being written. Of all the bits constituting the n-th line image data in each of them, the respective bits corresponding to each other are subjected to a comparison operation using an exclusive OR (exclusive OR), and the operations of the respective bits are calculated. It is also preferable to calculate the degree of coincidence of the line image data between the two by calculating the value with an adding circuit.

On the other hand, from the plurality of types of matching degree data calculated between the first line image data and the plurality of types of line image data which are candidates for the second line image data, the total It is also preferable that the comparison circuit is used to select the second line image data candidate having the highest matching degree of the first line image data.

In the present invention, the first line image data is initially stored in a predetermined write data register, and the line image data which is a candidate for the second line image data is selected. After the determination, it is preferable that the first line image data stored in the write data register be replaced with the second line image data.

[0040]

According to the present invention, since the above-mentioned technical configuration is employed, in writing the line image data, the first line image data and the second line image data to be written continuously are written. The power consumption is greatly reduced because the data is written (charged / discharged) by selecting the data writing order such that the data fluctuation is small and the number of times of charging / discharging to the capacitive load is small from the line image data group for one frame of the image It is possible to do.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a specific example of a plasma display device according to the present invention.

FIG. 2 is a block diagram showing an example of a configuration of a conventional plasma display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plasma display part 2 ... Image data buffer means 3 ... Write line image data register part 4 ... High voltage buffer part 5 ... Data line part 6 ... Scan line part 7 ... Scan driver means 8 ... Scan controller means 9 ... Control means 10 ... Bit part 20... Conventional plasma display device 21... Image data storage means 22... Coincidence degree calculating means 23... Exclusive OR (Ex-OR) circuit 24. Plasma display apparatus 31 according to the present invention 31 second line image data candidate storage register 32 first register unit 33 second register unit

Claims (14)

[Claims] 1. A plasma display device, comprising:
In the first line image data currently being written to the predetermined first line of the plasma display unit in all the image data constituting the frame, a plurality of other lines different from the first line are written. The other line image data to be configured is extracted as a plurality of other line image data candidates as second line image data to be written to the plasma display next to the first line image data,
The degree of coincidence between each of the plurality of extracted line image data candidates and the first line image data is calculated, and another line image data having the greatest degree of coincidence with the first line image data is calculated. The first line image data is selected as the second line image data to be written to the plasma display next to the first line image data, and the second line image data is written to a predetermined line in the plasma display. A method for driving a plasma display, comprising: 2. A method according to claim 1, wherein at least two types of line image data are selected as candidates for the line image data to be written after the operation of writing the first line image data. 2. The method according to claim 1, further comprising the steps of: 3. The calculation of the degree of coincidence in the plurality of different types of line image data is performed by extracting all data bits constituting the first line image data and candidates for the second line image data. 3. The plasma display driving method according to claim 1, wherein all the corresponding data bits of the respective line image data are compared with each other. 4. The first line image data currently being written and the n-th line image data among a plurality of types of line image data which are candidates for the second line image data are respectively constituted. Of all the bits, each bit corresponding to each other is subjected to a comparison operation using exclusive OR (exclusive OR), and the operation value of each bit is calculated by an adder circuit, whereby the two bits are calculated. 4. The plasma display driving method according to claim 1, wherein a degree of coincidence of the line image data in the interval is calculated. 5. The first line image data and the second line image data.
From the plurality of types of matching degree data calculated between each of the plurality of types of line image data that are candidates for the line image data, the first line image data is most matched by using a total number comparison circuit. 5. The method according to claim 4, wherein the second line image data candidate having a large degree is selected. 6. The first line image data includes:
It is stored in a predetermined write data register and the second
Is configured to replace the first line image data stored in the write data register with the second line image data after the line image data that is a candidate for the line image data is selected and determined. The method according to any one of claims 1 to 5, wherein: 7. A plasma display section having a scan line section and a data line section, scan driver means for selecting a plurality of scan lines constituting the scan line section, scan controller means for controlling the scan driver means, A plasma comprising: a write line image data register unit having a bit unit connected to each of a plurality of data lines constituting a data line unit; and image data buffer means for latching one frame of line image data. In the display device, other lines constituting a plurality of other lines different from the first line with respect to the first line image data currently being written on the predetermined first line of the plasma display unit. The image data is placed next to the plasma data after the first line image data. A plasma display device comprising a second line image data candidate storage register for storing as a second line image data candidate to be written to a display. 8. The plasma display device according to claim 7, wherein at least two types of second line image data candidate storage registers are provided. 9. The n-th second line image data candidate extracted as the plurality of types of second line image data is stored in a first register section of the second line image data candidate storage register. Is stored in the second register unit, and the m-th second line image data candidate extracted as the plurality of types of second line image data is stored in the second register unit. 9. The method according to claim 8, wherein
The plasma display device according to the above. 10. A matching degree calculating means for calculating a matching degree between each of the plurality of extracted line image data candidates and the first line image data, and a matching degree calculated by the matching degree calculating means. From the degree information, another line image data having the highest degree of coincidence with the first line image data is selected as second line image data to be written to the plasma display next to the first line image data. 10. The plasma display device according to claim 7, further comprising an arithmetic unit. 11. The matching degree calculating means includes: all data bits constituting the first line image data; and all the corresponding data of each line image data extracted as a candidate for the second line image data. 11. The plasma display apparatus according to claim 10, wherein the apparatus is configured to compare data bits. 12. The n-th line of a plurality of types of line image data which are candidates for the first line image data and the second line image data currently being written. An exclusive OR circuit for comparing each bit corresponding to each other among all bits constituting the image data, and an addition circuit for adding the operation value of each bit of the exclusive OR circuit are provided. 12. The plasma display device according to claim 11, wherein the addition circuit calculates the degree of coincidence of the line image data between the two by calculating. 13. A total number comparing circuit, wherein the total number comparing circuit compares each of the first line image data and each of a plurality of types of line image data which are candidates for the second line image data. 13. The plasma display according to claim 12, wherein the second line image data candidate having the largest matching degree with the first line image data is selected from a plurality of types of matching degree data calculated between the two. apparatus. 14. The write data register initially stores the first line image data. After the line image data that is a candidate for the second line image data is selected and determined, the write data register stores the first line image data. 14. The plasma display according to claim 7, wherein the first line image data stored in the data register is replaced with the second line image data. apparatus.