JP2655090B2 - Display unit address setting method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device constituted by a plurality of display units, and more particularly to a device capable of easily setting an address of a display unit.

[0002]

2. Description of the Related Art In a display device having a plurality of display elements (LEDs, LCDs, discharge tubes, etc.) in which lighting is controlled by providing a driver for each display element, display is performed when data is transmitted for each display element. Data wiring for the number of elements is required, the data wiring processing becomes enormous, and installation of the display device becomes difficult.

[0003] In view of the above, there is known a display device in which a display device is divided into a plurality of display units, and image data is received for each display unit (see Japanese Patent Application Laid-Open No. 1-129291).

Further, the display unit sets an address for each display unit, and selects and receives only data corresponding to the installation position from data transmitted for each display unit based on the address value. . Accordingly, data wiring is performed in units of display units, and thus, data wiring assembly is simplified.

FIG. 4 shows a conventional device, in which one unit of the display unit is shown by being surrounded by a chain line. The address setting of the display unit is performed using a display unit address setting switch 6 provided in the display unit for each display unit. The image address data latch unit 9 captures address data from the transmission data, and compares the address data with an address preset by the address setting switch 6. When the set address of the address setting switch 6 matches the received address data, the image data is latched by the image data latch unit 8, the image data is sent to the driver 21, and the lighting of the display element 22 is controlled by the driver 21. .

The address of the display unit is set by setting an address value of the display unit by the address setting switch 6 before installing the display unit on the display device, or by operating the address setting switch 6 after the display unit is assembled in the display device. I am trying to set it.

[0007]

In the above-described apparatus, when the display unit is set on the display device, an address value for determining the installation position of the display unit is set in advance in consideration of the installation position of the display unit. I had to keep it.

Also, once the address value is set,
At the display unit setting position, the display unit can be installed only at the set position. Therefore, sufficient attention must be paid to the installation of the display unit of the display device so as not to mistake the arrangement position.

If the display unit installation position is set at a position other than the predetermined position, the image data to be taken is different, and there is a problem that the image is disturbed in only one display unit of the display device. The address value of the display unit mounted on the display device must be changed.

The present invention has been made in view of the above points, and has as its object to enable a display unit to be installed without being conscious of the display unit installation position.

[0011]

In order to solve the above-mentioned problems, according to the present invention, in a display device comprising a plurality of display units, different address information indicating the address of each display unit is sequentially transmitted to the display units. In each display unit, the address information is sequentially sent to the next display unit, and when the address information is sent to all the display units, each address information is latched and held as an address of each display unit. I did it. Thereafter, using the held data as an address, only the image data sent to this address is received.

[0012]

A plurality of different pieces of address information are sequentially sent from the outside, and when each piece of information reaches each display unit, the information is latched and taken in as an address of the unit.
Thereby, address setting can be easily performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of the present invention, and a portion surrounded by a chain line in the drawing is one unit of a display unit.

In FIG. 1, reference numeral 1 denotes a data shift unit which takes in data from a data line at the timing of a clock signal;
Is a data latch unit that latches data from the data shift unit 1 by a latch signal 2a, and 3 is a decoding unit that decodes a part of the data from the data latch unit 2 as described later. Further, 4 is a unit address latch unit that latches data from the data latch unit as address data, 5 is an output data switching unit that switches output data, and 9 is an image address data latch unit that captures and latches image address data from data lines. It is. Reference numeral 7 denotes an address comparison unit for comparing address data from the image data address latch unit 9 with address data from the unit address latch unit 4, and reference numeral 8 denotes an image data latch unit 8 for latching image data from a data line.

As shown in FIG. 2, the display device includes n display units 11 to 1n, and the display units are connected in series.

Next, the operation of the embodiment will be described with reference to the timing chart of FIG. The operation of the present apparatus operates in two modes, namely, an address setting mode for setting an address of each display unit and an image data transmission mode for sending image data after the address setting is completed.

First, in the address setting mode, the data shift unit 1 latches input data in synchronization with a clock signal, and outputs the data to the output data switching unit 5 and the data latch unit 2. The output data switching unit 5 is initialized so as to be connected to the data shift unit 1, and transmits data from the data shift unit 1 to the next stage.
As a result, when the first-stage unit 11 transmits data to the second-stage unit 12, the data latched in the previous stage is transmitted, and the data is sequentially shifted and serially transmitted between the display units. become. Then, as shown in FIGS. 2 and 3, the unit address data transmitted first is latched in the display unit at the n-th stage,
When the n-th address data is latched in the first-stage display unit and the transmission of the address values set in all the display units 1 to n to the data latch unit 2 of each display unit is completed, a latch signal is output. 2a, the respective address data of each display unit is latched in the data latch unit 2.

The latched data is composed of an address section and a control data section (for example, 1 bit). The address section is sent to the unit address latch section 4 and the control data section is sent to the decoding section 3. The decoding section 3 decodes the control data section and generates a unit address latch signal 3a. The address section input to the unit address latch section 4 is latched as address data by the unit address latch signal 3a. As a result, all the units simultaneously set the display unit address value in the unit address latch unit 4.

The decoding unit 3 sends an output switching mode setting signal 3b to the output data switching unit 5 based on the data of the control data unit, and switches the mode from the address setting mode to the image data transmission mode. As a result, the output data switching unit 5 switches the received data to be transmitted through. When image data is transmitted, the image data is input to all display units in parallel, so that the data line becomes a normal (similar to FIG. 4) image data transmission signal line.

By the output switching control of the output data switching unit 5, it becomes possible to transmit the address setting data and the image data through the same data line.

In the image data transmission mode, as shown in FIG. 3, the image data 8a and the image address data 9a indicating the position of the display unit installed on the display device are alternately shown by data lines. Send. The image data address latched by the image data address latch unit 9 is latched and compared with the unit address latched by the display unit address latch unit 4 by the address comparison unit 7. When the two addresses match, the image data latch unit 8 latches the image data. Thereby, the predetermined image data of the installation position of the display unit can be captured. The fetched data is sent to the driver 21, which drives the display element 22.

In the above embodiment, the output data switching unit 5 switches the data line between two uses, namely, address setting and image data transmission, but in the present invention, the switching unit 5 is indispensable. Not a requirement. That is, the feature of the present invention is that the address of the display unit can be set from the outside using the data line. Therefore, the unit address latch unit 4, the decoding unit 3, and the output data switching unit 5 in FIG. 1 are omitted. Thus, the address may be latched in the data latch unit 2 and sent to the address comparison unit 7. However, if the output data switching unit 5 is provided as in the embodiment, as described above, 1
Address setting and image data transmission can be performed by the data lines, and the data lines can be saved.

In the above embodiment, the address data and the image data are sent alternately.
The present invention relates to an address setting method for a display unit. Therefore, a data transmission method is not limited to this, and another method may be used. For example, as is conventionally known, in a case where image data is sent in sequence according to the order of display units, the image data may be counted to detect the address of the display unit. Good.

[0024]

As described above, according to the present invention, in a display device having a display unit, even if the display unit is not installed in consideration of the display unit address determined by the installation position of the display unit, the display unit address can be obtained. The display unit can be configured on the display device without paying attention to the display device, and the display device can be easily assembled.

Another problem that may occur when a display device is assembled by setting a display unit address in advance, such as image displacement caused by an incorrect installation of the display unit, is that the display address value is set in the display device. It is eliminated from being set after installation.

Since the display unit address setting can be set by transmitting data, there is no need to change the display unit address setting value when the display unit address is changed, and the display unit address can be set by transmitting data.
The display unit address setting value can be easily changed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a unit address setting method according to the present invention.

FIG. 2 is a layout diagram of each display unit.

FIG. 3 is a timing diagram of the apparatus of FIG. 1;

FIG. 4 is a block diagram of a conventional display unit.

[Explanation of symbols]

 Reference Signs List 1 data shift section 2 data latch section 2a latch signal 3 decoding section 3a unit address latch signal 3b output switching mode setting signal 4 unit address latch section 5 output data switching section 6 display unit address setting switch 7 address comparison section 8 image data latch section 8a Image data 9 Image address data latch section 9b Image address data 11-1n Display units 1-n

Claims (3)

(57) [Claims] 1. An address setting method for a display unit, comprising a plurality of display units arranged in an array, assigning an address to each display unit, and taking in image data according to the address. Are sequentially transmitted, and in each display unit, the address information is sequentially transmitted to the next display unit, and when the address information is transmitted to all the display units, each address information is latched. hand,
A method of setting an address of a display unit, wherein the address is held as an address of the display unit. 2. A display device comprising a plurality of display units, wherein each display unit is connected by a data line for transmitting address information, wherein the address information comprises a different address indicating each display unit. A shift unit that shifts to the next stage, and a unit address latch unit that is connected to the shift unit and latches input data as an address of a display unit by a latch signal, wherein the latch signal is such that the address information is transmitted to all display units. An address setting device for a display unit, which is output when sent. 3. A display unit comprising a plurality of display units, wherein each display unit is connected by a data line, and each display unit is connected to the shift unit and shifts input data to the next stage by a latch signal. A unit address latch unit for latching data as an address of a display unit, and before input of the latch signal, input data is sent to the next stage via the shift unit, and after output of the latch signal, data lines are displayed in parallel. A display device, comprising: an output data switching unit that switches the data line so as to be connected to a unit, wherein an address of image data is collated with an address held in the unit address latch unit.