JPH06250609A - Simple matrix liquid crystal drive - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the memory capacity of a simple matrix liquid crystal drive device. [Structure] Two-dimensional image data sent in the order of horizontal scanning is stored in a memory block 20 and read out in the order of vertical scanning on the two-dimensional image data, and at the same time, the two-dimensional image sent next. The data is written to the place where the reading has already finished. The two-dimensional image data read from the memory block 20 in the vertical scanning order is converted in the conversion block 21 by the conversion matrix data from the matrix element generator 5, and the converted data is output in the vertical scanning order. The converted data is stored in the memory block 22,
At the same time as reading in the order of horizontal scanning, the conversion data to be sent next is written to the already read position. The liquid crystal panel drive block drives the simple matrix type liquid crystal display device 12 with a voltage according to the data from the memory block 22 and the matrix element generator 5.

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, simple matrix type liquid crystal display devices have been attracting attention as low cost liquid crystal displays.
The driving method will be briefly described. First, by calculating the product of a two-dimensional matrix of n rows and m columns (hereinafter abbreviated as image data) corresponding to a two-dimensional image, and a transformation matrix of orthogonal n rows and n columns. Converted data that is a two-dimensional matrix with n rows and m columns is created. Then, the scanning side of the simple matrix liquid crystal display device responds to each data when n rows of the conversion matrix correspond to n scanning electrodes and n columns of the conversion matrix correspond to the time axis. Driven by applying the voltage
The analog signal side of the simple matrix type liquid crystal display device corresponds to each data when m columns of converted data correspond to m signal electrodes and n rows of converted data correspond to time axis. A method of driving by applying a voltage to the signal electrode is adopted.

Hereinafter, in a finite two-dimensional space, assuming that 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, 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, horizontal scanning is performed by scanning all over a finite two-dimensional space.
By repeating the operation of sequentially scanning from the 1st row to the 1st row of the i-th row to the jth column, scanning all in 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 the first data of one image data is sent to the first data of the next one image data is sent. Is set to 1V.

Regarding this conventional driving method,
rdware Architectures for Video-Rate, Active Address
ed STN Displays, B. Clifton etc. JAPAN DISPLAY '92
It is described in detail in pp.504 to pp.506.

An example of the operation of the 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.
Entered in. The two-dimensional buffer memories 51 and 52 are
Data is written in the order of horizontal scanning, and data is read in the order of vertical scanning. The writing and reading states are repeated every 1V.
At this time, the selector 50 transfers the input image data to one of the two-dimensional buffer memories 51 and 52 which is in the writing state, and the selector 53 changes the input state from the two-dimensional buffer memories 51 and 52 to the reading state. Output some data. That is, the selectors 50 and 53 and the two-dimensional buffer memories 51 and 52 perform the operation of outputting the image data sent in the horizontal scanning order in the vertical scanning order.

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

The converted data transferred in the order of vertical scanning is input to the selector 57, and the two outputs of the selector 57 are input to the two-dimensional buffer memories 58 and 59. Two
The dimension buffer memories 58 and 59 are designed to write data in the order of vertical scanning and read data in the order of horizontal scanning, and repeat the writing and reading states every 1V. At this time, the selector 57 transfers the input conversion data to one of the two-dimensional buffer memories 58 and 59 which is in the writing state, and the selector 60 changes the input state from the two-dimensional buffer memories 58 and 59 to the reading state. Output some data.
That is, the selectors 57 and 60 and the two-dimensional buffer memories 58 and 59 perform the 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 horizontal scanning order 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 from the matrix element generator 56. The data of the conversion matrix to be generated is latched by the scanning side voltage register 61, and the scanning side driver 63 holds the voltage corresponding to the data latched in the scanning side voltage register 61 for each column, and the simple matrix 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 two-dimensional buffer memories are required to read out the image data sent in the horizontal scanning order in the vertical scanning order, and similarly. In order to read the converted data sent in the vertical scanning order in the horizontal scanning order, two two-dimensional buffer memories are required. Therefore, 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 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 this object, the simple matrix type liquid crystal drive device of the present invention repeats the operation of sequentially sending from the 1st row and 1st column to the 1st row and the mth column until 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 in order from the place where the data of the first row and the first column is written on the two-dimensional image to the place where the data of the nth row and the first column is written on the two-dimensional image. The reading operation is repeated up to the m-th column, and at the same time, the image data buffer memory that writes the data of each pixel of the next two-dimensional image sent to the location where the reading has already finished, and the matrix for converting the image data are output. Matrix element generating means, a 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 from the 1st row and 1st column to the qth row and 1st column By repeating the process up to the eye, the two-dimensional conversion data of q rows and r columns (q and r are natural numbers) sent from the conversion means is stored in the memory, and 1 is set on the two-dimensional conversion data.
The operation of sequentially reading from the place where the data of the first row and the row is written to the place where the data of the first row and the rth column is written on the two-dimensional conversion data is repeated up to the qth row, and at the same time,
The conversion data buffer memory for writing the data of each element of the two-dimensional conversion data sent next to the already read position, the liquid crystal display means using the simple matrix system, the data and the matrix from the conversion data buffer memory It has a constitution of driving means for driving the liquid crystal display means by using the data from the element generating means.

[0014]

With the above-described structure, the present invention makes effective use of the buffer memory without erasing the data that has not been read even if the data sent in sequence is written into the same buffer memory one after another. be able to.

[0015]

EXAMPLES Below, image data of n rows and m columns is m / 2 <n ≦.
Under the condition that m is satisfied, the operation of the simple matrix liquid crystal drive device of the present embodiment will be described with reference to FIG.

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

The register 3 has n memories,
The image data sent from the two-dimensional buffer memory 2 in the order of vertical scanning is output to the arithmetic unit 4 in parallel from the first column to the m-th column for each column (at this time, the register 3 exceeds the n-th row). Do not import the data of the row because it is unnecessary.) The matrix element generator 5 that outputs data for 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 being output from the register 3. To the arithmetic unit 4 in order. The operator 4 is a vector from the register 3 and a matrix element generator 5
The inner product of the vector from is calculated, and the converted data is output to the two-dimensional buffer memory 7 in the order of vertical scanning.

The address generator 6 repeats, for each 1V, the case where an address is generated in the order of vertical scanning in the address space of m rows and m columns and the case where the address is generated in the order of horizontal scanning. The conversion data is read from the location of the two-dimensional buffer memory 7 indicated by 6, and the conversion data sent in the order of the next vertical scanning is written in 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 in which image data does not need to be written, but writing is not performed in that area.

The D / A converter 9 converts the converted data transferred from the two-dimensional buffer memory 7 in the horizontal scanning order from a digital value to an analog value and transfers the converted data 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 the voltage according to the data from the scan side voltage register 8 The scanning side of the matrix type liquid crystal display device 12 is driven.

An image data buffer memory block 20 for outputting the image data sent in the horizontal scanning order from the address generator 1 and the two-dimensional buffer memory 2 is constituted, and the register 3 and the register 3 are provided. An image data conversion block 21 for converting image data from the arithmetic unit 4 and outputting the converted data in the order of vertical scanning is configured, and is 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 the conversion data coming in the order of horizontal scanning is configured, and includes the scanning side voltage register 8, the D / A converter 9, the scanning side driver 10, and the analog signal side driver 11. A liquid crystal panel drive block for driving the simple matrix type liquid crystal display device 12 using the matrix from the matrix element generator 5 and the converted data. Click 28 is formed.

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

Even if the definitions of the row and the column are exchanged, the effect of the invention does not change. As a result, the image data buffer memory block 20 only needs to perform vertical scanning and horizontal scanning on the two-dimensional image data, 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 examples.

Further, the converted data buffer memory block 22 is also 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 converted data buffer memory block 22 are
As a result, vertical scanning and horizontal scanning on the two-dimensional image data are sufficient, and even if a one-dimensional buffer memory is used, a method of using the memory without waste can be considered, and the present invention is not limited to the embodiment.

[0025]

As described above, according to the present invention, the addressing for the two-dimensional buffer memory repeats 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 and writing in the two-dimensional memory, the buffer memory for the image data and the converted data can be utilized without waste, the memory capacity can be reduced as compared with the conventional method, and the practical effect thereof is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing 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]

 1 address generator 2, 7 two-dimensional buffer memory 3 register 4 calculator 5 matrix element generator 6 address generator 8 scan side voltage register 9 D / A converter 10 scan 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

Claims (3)

[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 1st row and 1st column to the 1st row and mth column until the nth row. Data is stored in the memory, and from the place where the data in the first row and first column on the two-dimensional image is written, n rows and one row on the two-dimensional image.
An image data buffer memory for writing the data of each pixel of the next two-dimensional image sent to the location where the reading has been completed while repeating the operation of sequentially reading up to the location where the data of the column is written to the m-th row. A matrix element generating means for outputting a matrix for converting the image data; a converting means for calculating the converted data from the image data in the image data buffer memory using the matrix output by the matrix element generating means; By repeating the operation of sequentially sending from the first column to the qth row and the first column up to the rth column, the qth row r sent from the conversion means.
The two-dimensional conversion data of columns (q and r are natural numbers) are stored in a memory, and the data of the first row and the first column of the two-dimensional conversion data is written to the first row and the r-column of the two-dimensional conversion data. A conversion data buffer memory that writes the data of each element of the next two-dimensional conversion data sent to the next read position is repeated at the same time as the operation of sequentially reading up to the q-th row where the eye data is written. A liquid crystal display unit using a simple matrix system, and a drive unit for driving the liquid crystal display unit using the data from the conversion data buffer memory and the data from the matrix element generating unit. A simple matrix type liquid crystal drive device. 2. The image data buffer memory stores 1-dimensional input two-dimensional image data of n rows and m columns (n and m are natural numbers).
After the operation of sequentially writing from the row 1st column to the 1st row and the mth column is repeated up to the nth row, the operation of sequentially reading from the 1st row 1st column to the nth row 1st column is repeated up to the mth column, and at the same time, 2. The simple matrix type liquid crystal drive device according to claim 1, wherein the transmitted two-dimensional image data is written in such a manner that rows and columns are interchanged. 3. The conversion data buffer memory stores 1-dimensional input two-dimensional conversion data of q rows and r columns (q and r are natural numbers).
The operation of sequentially writing from the row 1st column to the qth row and the 1st column is repeated until the rth column, and then the operation of sequentially reading from the 1st row and the 1st row to the 1st row and the rth column is repeated to the qth row, and at the same time, the next data is sent. 2. A simple matrix type liquid crystal drive device according to claim 1, wherein the two-dimensional converted data is written in such a manner that rows and columns are interchanged.