JPH01149687A - Matrix type display device - Google Patents

Abstract

PURPOSE:To sufficiently use the almost whole area of a displaying area and to perform television display by using a less number of scanning lines by providing a timing controlling circuit which controls the timing for writing TV picture data in plural scanning lines of a matrix type display device at every one scanning line. CONSTITUTION:A timing controlling circuit 3 outputs a SData signal (indicating a 1st scanning line of television), clock (CLK), and an OE signal (signal for erasion) to be used for deciding the scanning timing of TV display to be made to a matrix type display device. A liquid crystal display panel 4 is provided with liquid cells 5 arranged in the form of a matrix and a TFT 6 for driving the cells 5. A data driver 7 latches video signal data at every 1H and holds a data voltage corresponding to the luminance during the period of 1H. A scan driver 8 performes scanning operations at a speed which is actually 1.5times faster than the speed of ordinary matrix type display devices by using the timing controlling signal of the timing controlling circuit 3.

Description

[Detailed Description of the Invention] [Summary] Regarding a matrix type display device such as an active matrix type liquid crystal display panel, it is possible to fully utilize almost the entire display area to perform television display with a smaller number of scanning lines. A timing control circuit is provided to perform timing control for writing television image data into a plurality of scanning lines of a matrix type display device per scanning line.

[Industrial application field]

The present invention relates to a matrix display device such as an active matrix liquid crystal display panel.

In recent years, the surface capacity of display devices used as displays for information terminals has tended to increase in order to display kanji characters, and display devices with a vertical dot count of about 750 have been realized. In this case, it is of course desirable to fully utilize the entire display area for display. [Prior art] Figure 4 shows the configuration of a general matrix display panel, and Figure 5 shows a conventional drive panel. The waveform diagrams are shown respectively. In Figure 4,
For example, when driving a display panel with 1120 dots in the horizontal direction and 750 dots in the vertical direction, there are 750 scanning lines (scanning electrodes) S+ to S1 in the vertical direction and 1120 data lines (data electrodes) D+ to vertical direction. D11°. Requires.

Here, each horizontal scanning period (1
H) for each scan voltage Vs+, VS2, Vs3 . 5(B) to (D)) are applied to each scanning line 81 to 57.
5o are selected one by one, while the data lines D1 to D
At 112°, a data voltage Di (voltage of the i-th data line) for displaying 1120 dots in the horizontal direction is applied in a 1H period.

As a result, dots on the selected scanning line are displayed according to the data voltage, and the entire image is displayed in a matrix.

[Problem that the invention seeks to solve]

Here, as shown in Figure 6 (A), (40 characters)
(25 lines) display matrix type display device ((28x30
) dot font) is displayed on television. Since the number of vertical scanning lines in a general television display area is 480 lines, it is shown in FIG. 6(A) (1
Even if an attempt is made to perform television display on a matrix type display device with 120 dots) x (150 dots), the number of scanning lines will not match, resulting in an area that is not involved in the display, as shown in Figure 6(B). However, there were problems such as not only the display area could not be used effectively and was wasted, but also had a strange appearance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a matrix type display device which can perform television display with a smaller number of scanning lines by fully using substantially the entire display area.

Means for Solving Problem C] The present invention, as shown in FIG. , S4 and S5,...)
The configuration includes a timing control circuit 3 that performs timing control for writing to.

[Effect]

In the present invention, the data of the first line of the television is written to the scanning line S+, 82 of the matrix type display device, and the data of the second line of the television is written to the scanning line S3 of the matrix type display device. Repeat writing alternately. In other words, two scanning lines of the television are displayed on three scanning lines of the matrix type display device, thereby making it possible to perform television display over substantially the entire matrix type display device.

〔Example〕

FIG. 1 shows a configuration diagram and a diagram explaining a scanning state of an embodiment of the present invention, and FIG. 2 shows a timing diagram of an embodiment of the present invention.

In FIG. 1(A), 1 is a video signal (1m degree signal) data input terminal, into which video signal data from a television is input. 2 is a synchronization signal input terminal into which, for example, a horizontal synchronization signal is input. 3 is a timing control circuit that determines the scanning timing for displaying television on a matrix type display device; 5Data signals (signal indicating the first scanning line of television); The signal m (last month's signal) is output. A liquid crystal display panel 4 is provided with liquid crystal cells 5 arranged in a matrix and a TFT 6 for driving the liquid crystal cells 5. A data driver 7 latches video signal data every day and holds a data voltage corresponding to the luminance for 1H. Reference numeral 8 denotes a scan driver which performs scanning at a speed substantially 1.5 times that of a normal matrix type display device in response to a timing control signal from the timing control circuit 3.

Next, the operation of the apparatus having the above configuration will be explained.

In FIG. 1(A), video signal data is supplied to the data driver 7, and for example, a data voltage Vow (FIG. 2, (1)) is supplied from the data line D1 to the first line.

The second line, etc. are sequentially output. On the other hand, the timing control circuit 3 outputs a 5-data signal generated from the horizontal synchronization signal ((A) in FIG. 2), a clock, and an OE multiple signal timing control signal (<8) to (O) in FIG. 2). ,
The signal is supplied to the scan driver 8.

In this case, there are alternating periods in which two clocks are generated during 1H and periods in which one clock is generated during 1H.

The scan driver 8 outputs a scan voltage V with a pulse width of o and sH in the first 1H (first line of the television).
s+, VS2 (Fig. 2 (E), (F)) are output, and in the next 2H (2nd line of the television), the scanning voltage VS3 (Fig. 2 (G)) is outputted, and the scanning voltage VS3 (Fig. 2 (G)) is output for 1H period. Therefore, the pulse width is 1H, so the erasing signal OE is set to 0.5H width) is output, and in the next 3) 1 (third line of the television), the scanning voltage VS4 (see Figure 2) is output. (
H)), Vss is output. As a result, Figure 1 (B
), the data voltage of the odd rows of the television is applied to the 1H applied to the data line by sequentially (or simultaneously) scanning the two scanning lines of the matrix type display device, and the data voltage of the even rows of the television is The data voltage scans one scanning line of the matrix type display device at 1H.

In this way, two scanning lines of the television are displayed on the 13 scanning lines i of the matrix type display device, and substantially 1.5 times as many scanning lines as the scanning lines of the television are obtained. Therefore, the 11,480 scanning lines of a television are interpolated, and for a matrix display device, 1.5 times that number, 12
It can be displayed with 0 scanning lines, and television display can be performed on almost the entire screen of a matrix type display device. Note that the control for changing the number of scanning lines selected for the matrix display device according to the odd/even row data of the television is not limited to repeating alternately every five times, for example, once every five times.
It may be an irregular repeated operation such as times.

FIG. 3 shows a diagram illustrating writing in another embodiment of the present invention. In the same figure (A), the first writing is performed in the same manner as in the above embodiment, and the second writing is performed by changing the second line of the television to the scanning lines 1sz, sg of the matrix type display device.
, the third line of the television is the scanning line 134 . of the matrix type display device. ...and repeat this alternately from the third time onwards. In this way, the scanning line S2 of the matrix type display device becomes the average of the data on the first line and the data on the second line of the television, and the scanning line S2 of the matrix type display device becomes the average of the data on the first line and the data on the second line of the television. This is the average of the data in the third row and the data in the fourth row, and it feels more natural to the human eye than the data in the previous example.

Figure 3 (B) shows that the first and second writings are shown in Figure 3 (B).
Writing is performed in the same manner as shown in A), and for the third and fourth times, writing is performed by further shifting the writing scanning line to the matrix type display device, and this process is repeated thereafter. This one is shown in Figure 3 (A)
In contrast, all the scanning lines of a matrix type display device can be displayed as an average of the scanning lines of a television, so a more natural image can be obtained.

In FIG. 2C, data for $115 television scan lines is displayed on six scan lines of a matrix display device. By repeating the first writing to the 55th writing, average data and non-average data are repeatedly obtained for every six scanning lines of the matrix type display device.

Note that when the video signal is sent in an interlaced manner, for example in FIG. 3(A), in the first writing (odd field of the television), the data of the first line of the television is scanned by the matrix type display device. write to lines S+, 32, write the data of the third line of the television to scan line 84, Ss, excluding scanning line S3, and write the data for the second time (
In the even field of the television), except for the scanning line S1, the data on the second line of the television is converted to the scanning line 32°83.
The data of the fourth line of the television is written to the scanning lines Ss and Ss, excluding the scanning line S4.

In this way, it is possible to cope with television interlacing without providing a special field memory.

In addition, timing control is performed such that in the odd field of the television, the odd (even) scanning line data of the television is transferred to the two scanning lines i (Sz and S2) of the matrix type display device.
, S4 tSs, ・”) k: i-in-mi, in the even field of the television, the even number (odd number) of the television
The scanning line data may be combined into two scanning lines (32 and 33, S3, S5 and S6, . . . ) of the matrix display device.

〔Effect of the invention〕

As explained above, according to the present invention, the display data of the television controller is written in a plurality of scanning lines of the matrix type display device, so that almost the entire display area is used and the number of scanning lines is smaller than that of the matrix type display device. It can be used for television display, and
Since there is no need to use a particular memory, the configuration can be simple.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention and a diagram explaining the scanning line state. FIG. 2 is a timing diagram of the present invention. FIG. 3 is a diagram explaining writing in another embodiment of the present invention. FIG. 5 is a diagram showing the configuration of a general matrix type display panel, FIG. 5 is a diagram of conventional driving waveforms, and FIG. 6 is a diagram showing how television display is performed on a conventional device. In the figure, 1 is a video signal input terminal, 2 is a synchronization signal input terminal, 3 is a timing control circuit, 4 is a liquid crystal display panel, 5 is a liquid crystal cell, and 6 is a TPT. 7 is a data driver, 8 is a scan driver, S+, 82, . . . are scanning lines of the matrix type display device, and D+*02* . . . are data lines of the matrix type display device. Second timing diagram of an embodiment of the present invention! ! I Figure 3 (A-1) Completely explaining the writing of other embodiments

Claims (5)

[Claims] (1) In a matrix display device that displays data in a matrix by selecting pixel cells (5) for each scanning line using electrodes arranged orthogonally in the vertical and horizontal directions, television image data is displayed in one scan. A plurality of scanning lines (S_1 and S_2, S_4 and S_
5,...) A matrix type display device characterized in that it is provided with a timing control circuit (3) that performs timing control for writing in the memory. (2) The timing control includes a plurality of scanning lines (S_1) of the matrix display device within one horizontal scanning period of the television.
and S_2, S_4 and S_5, ...) and scanning one scanning line (S_3, ...) of the matrix display device within one horizontal scanning period of the television are alternately performed. A matrix type display device according to claim 1. (3) The timing control writes odd numbered (or even numbered) scanning line data of the television to two scanning lines (S_1 and S_2, S_4 and S_5,...) of the matrix display device, and Claim 1, characterized in that data is displayed in 1.5 times as many scanning lines as the data.
The matrix type display device according to item 1 or 2. (4) The timing control is such that in the odd field of the television, the odd (even) scanning line data of the television is transferred to the two scanning lines (S_1 and S_1) of the matrix type display device.
2, S_4 and S_5,...), and write even number (odd number) scanning line data of the television to 1 of the matrix type display device.
The data is written on the scanning lines (S_3,...) of the book, and in the even field of the television, the even (odd) scanning line data of the television is written on the two scanning lines (S_3,...) of the matrix display device.
2 and S_3, S_5 and S_6, ...), and odd number (even number) scanning line data of the television is written to one scanning line (S_1, S_4, ...) of the matrix type display device. A matrix type display device according to claim 1, 2, or 3. (5) The timing control is such that in the odd field of the television, the odd (even) scanning line data of the television is transferred to the two scanning lines (S_1 and S_1) of the matrix type display device.
2, S_4 and S_5,...), and in the even field of the television, the even number (odd number) scanning line data of the television is written to the two scanning lines (S_
2 and S_3, S_5 and S_6, ...), the matrix type display device according to claim 1, 2, or 3.