JPH04245293A - Matrix type display device - Google Patents

Abstract

PURPOSE:To obtain a matrix type display device switching the scanning system for various signals for optimum scanning. CONSTITUTION:A matrix type display device has multiple scanning electrodes perpendicular to each other, a display panel arranged with multiple cells corresponding to intersections of data electrodes in the matrix shape, and a driver 2 selecting optional cells in the display panel and applied with the preset voltage to the scanning electrodes and data electrodes to write data. The driver 6 has a shift register 6 shifting the scanning data in sequence and selecting the preset line and a selecting means 10 dividing the output of the shift register 6 into two and selectively outputting either one output or both split outputs to the scanning electrodes for corresponding two lines respectively.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a matrix type display device, and more particularly to a matrix display device suitable for use in the field of flat panel displays, such as plasma displays and liquid crystal display devices (LCDs).
The present invention relates to a matrix type display device such as a display.

In recent years, matrix-type display devices such as plasma displays and liquid crystal display devices have become popular as display devices for small information terminal devices, such as laptop and notebook personal computers and word processors, because they are thin and lightweight. Many have been developed.

[0003] However, in the above-mentioned information terminal equipment,
As the display capacity continues to increase, the methods for transmitting data to matrix display devices include non-interlaced methods that sequentially scan one line at a time, interlaced methods that scan by skipping each line, and two-line methods. Since there are methods such as scanning each time, an interlaced matrix display device cannot, in principle, display anything other than the interlaced method.

[0004] Therefore, there is a need for a matrix type display device that is compatible with various types of data output.

[0005]

2. Description of the Related Art Conventional matrix display devices of this type include those shown in FIGS. 6 and 7, for example.

FIG. 6 is a block diagram showing the configuration of main parts of a conventional matrix type display device. In the figure, 11 is a display panel and 12 is a scan driver.

The scan driver 12 includes a shift register circuit 13 and a level conversion circuit 14, and converts the TTL level output from the shift register circuit 13 into the level conversion circuit 14.
It outputs high voltage.

In the above configuration, the shift register 13
Each output corresponds to each output of the scan driver 12, and the outputs are sequentially selected from the first scan electrode of the display panel 11.

Since the scanning electrodes are sequentially scanned and selected, in order to display an interlaced data signal, as shown in FIG. This is done by

0010

[Problems to be Solved by the Invention] However, in such a conventional matrix type display device, data for the entire screen is once loaded into the frame memory 15, and display is performed by converting the data arrangement. Therefore, in order to perform display without using the frame memory 15, it is necessary to scan by skipping one line at a time according to the interlaced signal, as shown in FIG. In a circuit, that is, a scan driver in which each output of the shift register corresponds to each output of the scan driver, interlaced scanning as shown in FIG. 8 cannot be performed, and the second line is always scanned after the first line.
Since the line is selected, an extra voltage is applied to the selected cell, which may deteriorate display quality.

Further, in this case, since the scanning data is shifted twice in a short period of time, a circuit for shifting is required, which causes the problem that the circuit configuration becomes complicated. Furthermore, for example, as a method for displaying a TV image with an interlaced signal, there is a method in which two lines are scanned at the same time, as shown in FIG. There was a problem in that the corresponding scan driver could not scan.

[Objective] Accordingly, it is an object of the present invention to provide a matrix type display device that performs optimal scanning by switching the scanning method for various signals.

[0013]

[Means for Solving the Problems] In order to achieve the above object, the matrix type display device according to the present invention supports a plurality of mutually orthogonal scanning electrodes and intersection points of data electrodes, as shown in FIG. a display panel including a plurality of cells arranged in a matrix, and a driver 2 that selects any cell in the display panel and writes data by applying a predetermined voltage to the scan electrode and the data electrode. A matrix type display device comprising: the driver 2;
A shift register 6 that sequentially shifts scanning data to select a predetermined line, and a shift register 6 that divides the output of the shift register 6 into two, and divides one or both of the outputs into two, each corresponding to two lines. It has a selection means 10 for selectively outputting the output to the scanning electrodes.

Specifically, a number of AND gates AND1 to AND6 corresponding to the number of outputs of the scan driver are prepared,
The output from the shift register 6 is input to one end input of the AND gates AND1 to AND6, and control signals A and B from the outside are input to the other end input of the AND gates AND1 to AND6. The output divided into two is selectively output to the scanning electrodes.

Further, when outputting the output of the shift register to the scanning electrode, the selection means 10 selects a mode 1 in which line by line is sequentially scanned as shown in FIG. 2(a) according to preset conditions. , to switch between three modes: mode 2, which scans by skipping every line as shown in Figure 2(b), and mode 3, which scans every two lines as shown in Figure 2(c). is valid.

[0016]

[Operation] In the present invention, the output of the shift register is divided into two, and one or both of these outputs is selectively outputted to two lines of scanning electrodes corresponding to the divided outputs by the selection means. be done.

That is, the scanning method is switched for various signals, and the optimum scanning for this signal is performed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings. 3 to 5 are diagrams showing one embodiment of a matrix type display device according to the present invention, and show an example applied to a liquid crystal display device.

FIG. 3 shows the overall structure of this embodiment, and FIG. 4 shows the main structure of this embodiment.

Note that in FIGS. 3 and 4, the same numbers as those given to the principle explanatory diagram shown in FIG. 1 indicate the same parts. First, the configuration will be explained.

The matrix type display device of this embodiment is shown in FIG.
As shown in the figure, they can be roughly divided into a liquid crystal panel 1 which is a display panel, a scan driver 2 which is a driver, and a data driver 3 which are drivers.
, a signal generator 4, and a power supply 5. In addition, L
P is a latch pulse, FR is a frame signal, S0,
S1 and S2 indicate predetermined setting values set at the select terminals.

As shown in FIG. 4, the scan driver 2 includes a shift register 6, a level conversion circuit 7, frequency dividers 8 and 9,
Exclusive OR Gate XOR1, OR Gate OR
1, AND gates AND1 to AND6, .

Next, the operation will be explained.

First, a scan data latch pulse LP and a frame signal FR are input from the signal generator 4 to the scan driver 2 . As shown in FIG. 5, the output of the latch pulse LP input to the scan driver 2 is cleared every time the frame signal FR becomes "H", and the frequency is divided by two by the frequency divider 8 to obtain the set value. The value of S0, specifically,
The latch pulse L is set to either “1” or “2”.
P or the latch pulse LP0 whose frequency has been divided by 2 is selected and input to the shift register 6 as a clock.

Furthermore, the frame signal FR inputted to the scan driver 2 as initial data of the shift register 6 is also divided by two by a frequency divider 9 as shown in FIG. The value of value S1, specifically,
Depending on the value of "1", "2", or "3", the latch pulse LP0, "H" whose frequency is divided by 2, or the frame signal FR0 whose frequency is divided by 2 is selected and the AND gate AN
These signals are input to one input end of D1 to AND6, and are sequentially shifted based on the clock.

Furthermore, the AND gate AND7 and the OR gate OR1 are valid gates when the number of scanning electrodes is odd and mode 1 is executed, and after the last odd-numbered electrode is selected, new shift data is input. It is captured.

That is, to explain based on the principle configuration diagram, the control signal B from the outside is LP0, which is the frequency of the latch pulse LP divided by two, or "H", or the frame signal FR is divided by two.
One of the frequency-divided data of FR0 is selected by the set value S1.

The control signal A from the outside has the value of the set value S2,
Specifically, depending on the value "1" or "2", either the inverted signal of the signal input to control signal B or the original signal input to control signal B is selected, and the AND gate AND
It is input to the other input terminal of 1 to AND6....

Therefore, by setting the set values S0, S1, and S2 to the values shown in Table 1, clocks for each mode can be generated as shown in FIG.

Therefore, in this embodiment, in a line-sequential scanning, that is, a non-interlaced matrix type display device, data signals sent in an interlaced manner can be displayed without using a frame memory for capturing images. is a method of scanning by skipping every line, 2
It is also possible to scan lines simultaneously.

As described above, in this embodiment, the output of the shift register is divided into two, and one or both of these outputs is applied to two lines of scanning electrodes corresponding to the outputs of the divided shift register. It can be selectively output using the selection means.

Therefore, the scanning method can be switched for various signals, and scanning can be performed optimally for this signal.

[0033]

[Effect of the invention] In the present invention, the output of the shift register is
and output one or both of these outputs to 2
The outputs of the divided shift registers can be selectively output to two lines of scanning electrodes corresponding to the respective outputs by the selection means.

[0034] Therefore, the scanning method can be switched for various signals, and scanning can be performed optimally for this signal.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of a matrix type display device of the present invention.

FIG. 2 is a timing chart for each drive mode in FIG. 1;

FIG. 3 is a diagram showing the overall configuration of an embodiment of the present invention.

FIG. 4 is a diagram showing a main part configuration of an embodiment of the present invention.

FIG. 5 is a timing chart for explaining the operation of one embodiment of the present invention.

FIG. 6 is a diagram showing the main part configuration of a conventional example.

FIG. 7 is a diagram for explaining the operation of the conventional example.

FIG. 8 is a diagram for explaining a driving method in which interlaced scanning is performed for each line.

FIG. 9 is a diagram for explaining a driving method in which two lines are scanned simultaneously.

[Explanation of symbols]

1 Liquid crystal panel (display panel) 2 Scan driver (driver) 3 Data driver (driver) 4 Signal generator 5 Power supply 6 Shift register 7 Level conversion circuit 8 2 frequency divider 9 2 frequency divider 10 Selection means OR1 OR gate XOR1 Exclusive OR Gate AND1
~AND6…AND gate AND7 AND gate

Claims (2)

[Claims] 1. A display panel in which a plurality of scan electrodes perpendicular to each other and a plurality of cells corresponding to the intersections of data electrodes are arranged in a matrix, an arbitrary cell in the display panel is selected, and the scan electrode , and a driver that writes data by applying a predetermined voltage to the data electrode, the driver including a shift register that sequentially shifts scanning data to select a predetermined line. , a selection means for dividing the output of the shift register into two and selectively outputting one or both of the outputs to two lines of scanning electrodes corresponding to the divided outputs. Matrix type display device. 2. When outputting the output of the shift register to the scanning electrode, the selection means selects a mode in which the output of the shift register is outputted to the scanning electrode, a mode in which the output is sequentially scanned line by line, a mode in which the scan is skipped line by line; Claim 1 characterized in that three modes of scanning each line are switched.
matrix type display device.