JP3358223B2 - Simple matrix liquid crystal drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple matrix type liquid crystal driving device for driving a simple matrix type liquid crystal panel.

[0002]

2. Description of the Related Art In recent years, a simple matrix type liquid crystal display has been attracting attention as a low-cost liquid crystal display.
The driving method will be briefly described. First, a two-dimensional matrix of n rows and m columns (hereinafter, abbreviated as image data) corresponding to a two-dimensional image is calculated by calculating a product of a transformation matrix of n rows and n columns. Create conversion data that is a two-dimensional matrix with n rows and m columns. The scanning side of the simple matrix type liquid crystal display device responds to each data when the n rows of the conversion matrix correspond to the n scanning electrodes and the n columns of the conversion matrix correspond to the time axis. Drive by applying the applied voltage to the scanning electrodes,
The analog signal side of the simple matrix type liquid crystal display device corresponds to each data when the m columns of the conversion data correspond to the m signal electrodes and the n rows of the conversion data correspond to the time axis. A method of driving by applying a voltage to a signal electrode has been adopted.

[0003] Hereinafter, in a finite two-dimensional space, when the vertical address is from the first row to the i-th row and the horizontal address is from the first column to the j-th column, the first row and the first column to the first row j By repeating the operation of sequentially scanning up to the column up to the i-th row, scanning all over a finite two-dimensional space is performed by horizontal scanning.
By repeating the operation of sequentially scanning from the first row to the i-th row to the j-th column, scanning all over a finite two-dimensional space is defined as vertical scanning. The image data input to the simple matrix type liquid crystal driving device is transferred in the order of horizontal scanning, and after a blank period shorter than one image data,
The next image data is transferred one after another in the same order, but from when the first data of one image data is transmitted until the first data of the next one image data is transmitted. Is 1V.

[0004] In this conventional driving method, Ha
rdware Architectures for Video-Rate, Active Address
ed STN Displays, B. Clifton etc. JAPAN DISPLAY '92
pp. 504 to 506.

An example of the operation of a conventional simple matrix type liquid crystal driving device using such a method will be described with reference to FIG.

In FIG. 2, image data transferred in the order of horizontal scanning is input to a selector 50, and two outputs of the selector 50 are two-dimensional buffer memories 51 and 52.
Is input to The two-dimensional buffer memories 51 and 52 are
An operation of writing data in the order of horizontal scanning and reading data in the order of vertical scanning is performed, and the state of writing and reading is repeated for each 1V.
At this time, the selector 50 transfers the input image data to the writing state of the two-dimensional buffer memories 51 and 52, and the selector 53 changes the reading state of the input from the two-dimensional buffer memories 51 and 52. Output some data. That is, the selectors 50 and 53 and the two-dimensional buffer memories 51 and 52 perform an operation of outputting image data sent in the order of horizontal scanning in the order of vertical scanning.

The register 54 has n memories, and outputs column vectors of image data sent from the selector 53 in the vertical scanning order to the computing unit 55 in order from the first column to the mth column. Further, while one column vector is being output from the register 54, the matrix element generator 56 outputs the row vectors of the transformation matrix to the arithmetic unit 55 in order from the first row to the n-th row. Arithmetic unit 55 calculates the inner product of the vector from register 54 and the vector from matrix element generator 56 and outputs the result to selector 57. That is, the computing unit 55
The conversion data is output in the order of vertical scanning.

The converted data transferred in the vertical scanning order is input to a selector 57, and two outputs of the selector 57 are input to two-dimensional buffer memories 58 and 59. 2
The dimension buffer memories 58 and 59 perform operations of writing data in the order of vertical scanning and reading data in the order of horizontal scanning, and repeat the writing and reading states for each 1V. At this time, the selector 57 transfers the input converted data to the one of the two-dimensional buffer memories 58 and 59 which is in the write state, and the selector 60 switches the read data of the inputs from the two-dimensional buffer memories 58 and 59 to the read state. Output some data.
That is, the selectors 57 and 60 and the two-dimensional buffer memories 58 and 59 perform an operation of outputting the converted data sent in the vertical scanning order in the horizontal scanning order.

The D / A converter 62 converts the conversion data input from the selector 60 in the order of horizontal scanning from a digital value to an analog value, and transfers it to the analog signal side driver 64. The analog signal side driver 64 holds the voltage corresponding to the analog value sent in the order of horizontal scanning for each row, drives the signal side of the simple matrix type liquid crystal display device 65, and outputs the signal from the matrix element generator 56. The data of the converted matrix is latched by the scanning-side voltage register 61, and the scanning-side driver 63 holds a voltage corresponding to the data latched by the scanning-side voltage register 61 for each column, and a simple matrix type liquid crystal. The scanning side of the display device 65 is driven.

The simple matrix type liquid crystal panel is driven by such a method.

[0011]

However, in the above configuration, two-dimensional buffer memories are required for reading out image data sent in the order of horizontal scanning in the order of vertical scanning. In order to read the converted data sent in the order of vertical scanning in the order of horizontal scanning, two two-dimensional buffer memories are required. For this reason, the conventional simple matrix type liquid crystal driving device has a problem that a large-capacity two-dimensional buffer memory is required.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a simple matrix type liquid crystal driving device in which the capacity of a two-dimensional buffer memory is reduced.

[0013]

In order to achieve the above object, a simple matrix type liquid crystal driving device according to the present invention repeats the operation of sequentially sending from the first row to the first column to the first row and the mth column to the nth row. 2 of n rows and m columns (n and m are natural numbers) sent
The data of each pixel of the two-dimensional image is stored in the memory, and from the location where the data of the first row and the first column on the two-dimensional image is written to the location where the data of the nth row and the first column is written on the two-dimensional image The read operation is repeated up to the m-th column, and at the same time, an image data buffer memory for writing the data of each pixel of the next two-dimensional image to the place where the reading has already been completed, and a matrix for converting the image data are output. Matrix element generating means, converting means for converting the image data in the image data buffer memory using the matrix output from the matrix element generating means, and an operation of sequentially sending the data from the first row to the first column to the q row and the first column in the r column By repeating this process, the two-dimensional conversion data of q rows and r columns (q and r are natural numbers) sent from the conversion means are stored in the memory,
The operation of sequentially reading data from the location where the data in the first row and the column is written to the location where the data in the first row and the rth column on the two-dimensional converted data is written is repeated up to the q-th row.
A conversion data buffer memory for writing the data of each element of the next two-dimensional conversion data to a location where reading has already been completed; a liquid crystal display means using a simple matrix method; data and a matrix from the conversion data buffer memory It has a configuration of a driving unit for driving the liquid crystal display unit using data from the element generating unit.

[0014]

According to the present invention, the buffer memory is effectively used without erasing data that has not been read even if the data sent sequentially is written to the same buffer memory one after another. be able to.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, image data of n rows and m columns is m / 2 <n ≦
The operation of the simple matrix type liquid crystal driving device of the present embodiment under the condition that m is satisfied will be described with reference to FIG.

The address generator 1 repeats a case of generating an address in the order of horizontal scanning and a case of generating an address in the order of vertical scanning in an address space of m rows and m columns every 1 V. Image data is read from the location of the two-dimensional buffer memory 2 indicated by 1 and the next image data to be sent is written to the location where the image data was read. With this operation, image data sent in the order of horizontal scanning can be output in the order of vertical scanning.

The register 3 has n memories,
Image data sent from the two-dimensional buffer memory 2 in the order of vertical scanning is output in parallel from the first column to the mth column by one column to the arithmetic unit 4 (at this time, the register 3 exceeds the nth row) Row data is unnecessary and should not be imported.) The matrix element generator 5 that outputs data of one row of the transformation matrix in parallel outputs the row vector of the transformation matrix from the first row to the n-th row while one column vector is output from the register 3. Are sequentially output to the arithmetic unit 4. The operation unit 4 includes a vector from the register 3 and a matrix element generator 5
, And outputs converted data to the two-dimensional buffer memory 7 in the order of vertical scanning.

The address generator 6 repeats a case of generating an address in the order of vertical scanning and a case of generating an address in the order of horizontal scanning in an address space of m rows and m columns every 1 V. The converted data is read from the location of the two-dimensional buffer memory 7 indicated by 6 and the converted data sent in the next vertical scanning order is written to the read location. By this operation, the converted data sent in the order of vertical scanning can be output in the order of horizontal scanning. At this time, there is an area where image data does not need to be written, but writing is not performed in that area.

The D / A converter 9 converts the conversion data transferred from the two-dimensional buffer memory 7 in the horizontal scanning order from a digital value to an analog value, and transfers it to the analog signal side driver 11. Analog signal side driver 11
Holds the voltage corresponding to the analog value sent from the D / A converter 9 for each row, and drives the signal side of the simple matrix type liquid crystal display device 12. The data of the conversion matrix output from the matrix element generator 5 is latched by the scan-side voltage register 8, and the scan-side driver 10 holds a voltage corresponding to the data from the scan-side voltage register 8, and The scanning side of the matrix type liquid crystal display device 12 is driven.

An image data buffer memory block 20 for outputting image data sent in the order of horizontal scanning from the address generator 1 and the two-dimensional buffer memory 2 is arranged in the order of vertical scanning. An image data conversion block 21 for converting the image data and outputting the converted data in the order of vertical scanning is configured from the arithmetic unit 4 and sent from the address generator 6 and the two-dimensional buffer memory 7 in the order of vertical scanning. A conversion data buffer memory block 22 for outputting incoming conversion data in the order of horizontal scanning is configured, and includes a scanning-side voltage register 8, a D / A converter 9, a scanning-side driver 10, and an analog signal-side driver 11. A liquid crystal panel driving block for driving the simple matrix type liquid crystal display device 12 using the matrix from the matrix element generator 5 and the conversion data. Click 28 is formed.

As described above, according to the embodiment of the present invention, 1
The data of each pixel of the two-dimensional image of n rows and m columns sent by repeating the operation of sequentially transmitting from the first row to the first row and the mth column up to the nth row is stored in the memory, The operation of sequentially reading data from the location where the data in the first row and the first column is written to the location where the data in the n-th row and the first column is written on the two-dimensional image is repeated up to the m-th column, and at the same time, 2 An image data buffer memory (image data buffer memory block 20) for writing data of each pixel of the two-dimensional image to a place where reading has already been completed, and a matrix element generator (matrix element generator) for outputting a matrix for converting image data 5) conversion means (image data conversion block 21) for converting image data in the image data buffer memory using the matrix output from the matrix element generation means;
By repeating the operation of sequentially sending data from the first row to the first column to the qth row and the first column up to the rth column, the two-dimensional conversion data of the qth row and the rth column sent from the conversion means is stored in the memory, and Is sequentially read from the location where the data of the first row and the first column is written to the location where the data of the first row and the rth column on the two-dimensional converted data is written to the qth row, and at the same time, A conversion data buffer memory (conversion data buffer memory block 22) for writing data of each element of the coming two-dimensional conversion data to a place where reading has already been completed, and a liquid crystal display means using a simple matrix method (simple matrix liquid crystal display device 12) ) And driving means (liquid crystal panel) for driving the liquid crystal display means using data from the conversion data buffer memory and data from the matrix element generating means. By driving block 23) provided with a memory capacity required can be configured less than the conventional method.

It should be noted that the effects of the present invention are not changed even if the definitions of the rows and columns are exchanged. Further, the image data buffer memory block 20 only needs to have vertical scanning and horizontal scanning on the two-dimensional image data as a result, and a method of not performing horizontal scanning and vertical scanning on the two-dimensional buffer memory 2 can be considered. It is not limited to the embodiment.

Further, the converted data buffer memory block 22 is the same as the image data buffer memory block 20, and is not limited to the embodiment.

In addition, the image data buffer memory block 20 and the conversion data buffer memory block 22
As a result, vertical scanning and horizontal scanning on the two-dimensional image data only need to be performed, and a method of using the memory without waste even if a one-dimensional buffer memory is used can be considered, and the present invention is not limited to the embodiment.

[0025]

As described above, according to the present invention, the addressing of the two-dimensional buffer memory is performed by repeating the horizontal scanning and the vertical scanning alternately for each image, and at the same time, the rows and columns of the input image data are changed. By replacing the data with the two-dimensional memory, the buffer memory for the image data and the converted data is used without waste, the memory capacity can be reduced as compared with the conventional method, and the practical effect is large.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a simple matrix type liquid crystal driving device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional simple matrix type liquid crystal driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Address generator 2, 7 Two-dimensional buffer memory 3 Register 4 Arithmetic unit 5 Matrix element generator 6 Address generator 8 Scanning side voltage register 9 D / A converter 10 Scanning side driver 11 Analog signal side driver 12 Simple matrix type Liquid crystal display device 20 Image data buffer memory block 21 Image data conversion block 22 Conversion data buffer memory block 23 Liquid crystal panel drive block

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09G 3/36 G02F 1/133 545 G09G 3/20 631

Claims (5)

(57) [Claims] 1. Each pixel of a two-dimensional image of n rows and m columns (n and m are natural numbers) transmitted by repeating the operation of sequentially transmitting from the first row and the first column to the first row and the mth column until the nth row Is stored in the memory, and from the place where the data in the first row and the first column on the two-dimensional image is written, n rows 1
An operation of sequentially reading data up to the position where the data of the column is written is repeated up to the m-th column, and at the same time, an image data buffer memory for writing the data of each pixel of the next transmitted two-dimensional image to the place where the reading has already been completed. Matrix element generating means for outputting a matrix for converting image data; converting means for calculating conversion data from image data in the image data buffer memory using a matrix output from the matrix element generating means; By repeating the operation of sequentially transmitting the data from the first column to the q-th row and the first column up to the r-th column, the q-row r
The two-dimensional conversion data of the columns (q and r are natural numbers) are stored in a memory, and the first row and the first column of the two-dimensional conversion data are written from the position where the data of the first row and the first column on the two-dimensional conversion data is written. At the same time as repeating the operation of sequentially reading out data up to the q-th row up to the location where the data of the second order has been written, a conversion data buffer memory for writing the data of each element of the next two-dimensional conversion data to the location where the reading has already been completed. Liquid crystal display means using a simple matrix system; and driving means for driving the liquid crystal display means using data from the conversion data buffer memory and data from the matrix element generating means. Simple matrix type liquid crystal driving device. 2. An image data buffer memory stores two-dimensional image data of n rows and m columns (n and m are natural numbers) as 1
The operation of sequentially writing from the first row to the first column and the m-th column is repeated until the n-th row, and then the operation of sequentially reading the first row and the first column to the n-th row and the first column is repeated until the m-th column. 2. The simple matrix type liquid crystal driving device according to claim 1, wherein the writing is performed in such a manner that rows and columns of the transmitted two-dimensional image data are exchanged. 3. The conversion data buffer memory stores the input two-dimensional conversion data of q rows and r columns (q and r are natural numbers) by one.
The operation of sequentially writing from the first row to the q-th row and the first column is repeated up to the r-th column, and then the operation of sequentially reading the first row and the first column to the first row and the r-th column is repeated up to the q-th row and simultaneously transmitted to the next row. 2. The simple matrix type liquid crystal driving device according to claim 1, wherein the writing is performed in such a manner that the rows and columns of the two-dimensional conversion data are exchanged. 4. An image data for storing and outputting input image data.
Output data according to the data buffer memory and matrix elements.
Matrix element generating means for inputting and outputting the matrix element generating means.
The image data buffer memory using the
Conversion means for calculating conversion data from image data;
Conversion data buffer for storing and outputting the output data of the conversion means
Memory and liquid crystal display means using simple matrix method
And the data from the conversion data buffer memory and the
The liquid crystal display using data from a matrix element generating means.
Driving means for driving the means, The image data buffer memory includes one row from the first row and the first column.
The sending operation is repeated by repeating the sending operation up to the mth column up to the nth row.
Of a two-dimensional image of n rows and m columns (n and m are natural numbers)
The data of each pixel is stored in the memory, and is displayed on the two-dimensional image.
From the location where the data in the first row and first column of
The data in the n-th row and the first column on the two-dimensional image is written
If the operation of reading sequentially to the place where
First, the data of each pixel of the two-dimensional image sent next is
Simple to write in the place where reading has been completed
Matrix type liquid crystal drive. 5. An image data storing and outputting input image data.
Output data according to the data buffer memory and matrix elements.
Matrix element generating means for inputting and outputting the matrix element generating means.
The image data buffer memory using the
Conversion means for calculating conversion data from image data;
Conversion data buffer for storing and outputting the output data of the conversion means
Memory and liquid crystal display means using simple matrix method
And the data from the conversion data buffer memory and the
The liquid crystal display using data from a matrix element generating means.
Driving means for driving the means, The conversion data buffer memory is q rows from the first row and the first column.
By repeating the operation of sending up to the first column up to the r-th column,
Q rows and r columns (q and r are natural
) Is stored in a memory,
On the conversion data Data in the first row and first column
From row 1 to row r on the two-dimensional conversion data
The operation of sequentially reading up to the place where the data of
Repeat until the second line, and the next two-dimensional transformation
Write the data of each element of the
Simple matrix type liquid crystal driving device characterized by
Place.