JPH02301796A - Color transmission method for digital video signal - Google Patents

Abstract

PURPOSE:To transmit video signals of plural colors by one piece of video signal line and to execute the display by inputting the video signal of a color by a shift register. CONSTITUTION:Video signals 7a, 7b are video data of a 4-picture element portion of red and green of a first line 11 of a display unit A 10, respectively. In the same way, video signals 7c, 7d are video data of a 4-picture element portion of red and green of a first line 13 of a display unit B 12, respectively. These video signals 7a - 7d are inputted to each shift register 14 - 17 by a video synchronizing signal 7' and displayed by a line synchronizing signal 8a. In this case, since a screen synchronizing signal 9a is turned on, they are displayed on first lines 11, 13 of the respective units. Subsequently, by a line synchronizing signal 8b, color video data of a second line is displayed on a second line. Thereafter, the display of a 4-line portion is executed in the same way, one screen is completed, and next, the next screen display is started by a screen synchronizing signal 9b. In such a way, video signals of plural colors can be transmitted and displayed by one piece of video signal.

Description

[Detailed Description of the Invention] Conventionally, in order to perform color display on a light emitting diode matrix display screen, a plurality of video signal lines corresponding to each color were used. This invention is a method of transmitting signals.

First, a conventional digital video signal transmission method will be explained. As an example, a matrix display screen with 4 rows and 5 columns is used. FIG. 1 is a timing chart of a digital video signal. (1) is video data, and in the case of i color, there are multiple pieces of this data. (2) is a video synchronization signal. (1a)～(
The video data 1e) is captured at the rising edge of the video synchronization signals (2a) to (2e), respectively. This (1a
) to (1e), the line synchronization signal (3
) is displayed on the display screen of FIG. 2 by (3a).

(4) is a screen synchronization signal for determining this display area. That is, when the screen synchronization signal (4a) is on at the time of the synchronization signal (3a), the line is displayed in the initial line display area, for example (5). (5a) to (5e) are display pixels corresponding to the video data of (1a) to (1e). Then, by the line synchronization signal (3b),
The display switches from the area (5) to the next area, and the next line of video data is displayed in that area. Thereafter, in the same way, finally, the final video data is displayed in the final line display area (6) by the final line synchronization signal (3d). Note that blanking time may be added when the screen is cut or cut. Further, although the line display area is one line on the side of the screen, it may be multiple lines or less than one line.

It may be vertical. Furthermore, if one line display area is the entire screen, the screen synchronization signal (4) is not necessary. With the above, the single screen display is completed, and then the screen synchronization signal (4
b) The next screen is displayed.

These screen changes occur one after another at a speed that is imperceptible to the human eye.

Next, the method of transmitting and displaying video signals of multiple colors using one video signal, which is the present invention, will be explained with reference to FIGS. 3 and 4 using a red-green two-color video signal as an example. . Also,
It is assumed that two display units arranged in 4 rows and 4 columns are connected on the display board side. FIG. 3 is a transmission timing chart thereof. (7) is a composite color video signal, (7a), (7b
) are the 1st line (1
This is video data for 4 red and green pixels of 1). Similarly, (7C) and (7d) are display units l-B, respectively.
This is video data for four pixels of red and green on the first line (13) of (12). These video signals (7a) ~
(7d) is displayed in (8a) of each shift register (26) to (29)f and the line synchronization signal (8) by the video synchronization signal (7'). At this time, since (9a) of the screen synchronization signal (9) is on, the screen is displayed on the first line (11) and (13) of each unit. Next, the line synchronization signal (8b) causes the second line of color video data to be displayed on the second line. The following four lines are displayed in the same way, one screen is completed, and then,
The next screen display starts from the screen synchronization signal (9b). As in the past, this screen switching must be performed one after another at a speed that is imperceptible to the human eye.

[Brief explanation of drawings]

Figure 1 is a conventional timing chart Figure 2 shows the light emitting diode display screen. Figure 3 is a timing chart of the present invention. FIG. 4 is a detailed explanatory diagram of the present invention.

Claims (1)

[Claims] One line of multiple color video signals is alternately transmitted within one line of the video signal using one video signal line of the digital video signal for the light emitting diode matrix display screen, and the display receiving side responds accordingly. A method of displaying color by receiving color video signals in each shift register.