JP2001134209A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device whose constitution is simple and whose cost is low. SOLUTION: This device is constituted of a display element 2 and a control circuit which is formed on a printed board 10 and the device shows plural functions by control of the display element 2 by the control circuit. A conductive pattern 11 constituting terminals of the control circuit and conductive patterns 41', 42' and 51', 52' constituting open terminals of a function changeover circuit are formed adjacently on the board 10 and conductive patterns 41', 42' and 51', 52' of the function changeover circuit are respectively short-circuited by a connector 12 for connecting the conductive pattern 11 of the control circuit and the display element 2. Then, function changeover signals are outputted to the control circuit in accordance with the opening and the short circuit of the conductive patterns 41', 42' and 51', 52' and functions of the display device are changed over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device provided in electric or electronic equipment.

[0002]

2. Description of the Related Art Generally, a display device comprises a display element such as a liquid crystal panel and a control circuit for controlling the display element and other circuits. As the control circuit, a one-chip microcomputer (hereinafter, referred to as a “microcomputer”) having software for providing a display device with a plurality of functions is used.
The display device can be mounted on various electric or electronic devices depending on functions. That is, even if the display devices have different functions, the configurations of the display element, the microcomputer, the printed circuit board on which the microcomputer is mounted, and other circuits are common.

There is also a display device in which a microcomputer, a printed circuit board, and other circuits are used in common, and display elements can be replaced with those having various configurations. In this case, control according to each configuration of the display element is programmed in the microcomputer, and the function differs depending on the display element.

FIG. 6 shows an example of the configuration of the above-mentioned display device. The display element 2 and the function switching circuit 3 are connected to the control circuit 1. Other circuits connected to the control circuit 1 are not shown.

The function switching circuit 3 outputs signals to the input terminals 6 and 7 of the control circuit 1 in response to opening and shorting of the terminals 41 and 42 and 51 and 52. When the terminals 41 and 42 are open, the output of the input terminal 6 is pulled up by the resistor 8 and becomes High. When the terminals 41 and 42 are short-circuited by a jumper wire or the like, the output of the input terminal 6 becomes low.
become. The same applies to the input terminals 7 connected to the terminals 51 and 52 and the resistor 9.

The terminals 41, 42 and 51, 52 of the function switching circuit 3 are previously opened and short-circuited, and a signal (function switching signal) is supplied to the input terminals 6, 7 of the control circuit 1 when the display device is powered on. ) Is entered. The control circuit 1 reads the function switching signal and switches the control program accordingly. Therefore, the function of the display device is also switched.

[0007]

However, in the above-mentioned conventional display device, the function switching circuit 3 is formed on a printed circuit board different from the control circuit 1, so that the printed circuit board assembly other than the control circuit 1 is also required. Assembly and management were required. Further, in order to short-circuit the terminals 41, 42 and 51, 52 of the function switching circuit 3, expensive members such as jumpers or switches have been used.

The present invention has been made in view of the above problems, and has as its object to provide a display device having a simple configuration and a low cost.

[0009]

To achieve the above object, a display device of the present invention comprises a display element and a control circuit formed on a printed circuit board. It shows. here,
A function switching circuit having a plurality of open terminals is formed on the printed circuit board, and a function switching signal is output to a control circuit in response to opening and short-circuiting of the open terminals to switch functions. That is, the control circuit and the function switching circuit are formed on the same printed circuit board.

In the above display device, the conductive pattern forming the terminal of the control circuit and the conductive pattern forming the open terminal of the function switching circuit are formed close to each other on the printed circuit board. The connection member for connecting the conductive pattern of the control circuit and the display element short-circuits the conductive pattern of the function switching circuit. That is, the connection member is also used to connect the control circuit to the display element and to short-circuit the terminals of the function switching circuit.

In the above display device, the function switching circuit has a plurality of conductive patterns formed for each of the open terminals. Therefore, the conductive area is increased accordingly.

[0012]

Embodiments of the present invention will be described below. The display device according to the present embodiment includes a display element, a control circuit (microcomputer), a printed circuit board, a function switching circuit, and other circuits (not shown) as in the related art. Signs are attached.

The display device of this embodiment has a control circuit 1 and a function switching circuit 3 formed on the same printed circuit board. FIG. 1 is a schematic view of the configuration of the printed circuit board.
Display element 2 (not shown in FIG. 1) on printed circuit board 10
A plurality of conductive patterns 11 are formed as terminals of the control circuit 1 for connecting to the control circuit 1.

The terminals 41, 41 of the control circuit 3 shown in FIG.
42 and conductive patterns 41 ', 42' corresponding to 51, 52
And 51 ′, 52 ′ are also formed on the printed circuit board 10. The conductive pattern 11 of the control circuit 1 and the conductive patterns 41 ', 42' and 51 ', 52' of the function switching circuit 3 are close to each other.

The conductive patterns 41 ', 42' and 51 ',
52 ′ is similar to the terminals 41, 42 and 51, 52,
The circuit is configured to output a signal to the input terminals 6 and 7 of the control circuit 1 according to the opening and the short circuit. That is, when the conductive patterns 41 ′ and 42 ′ are open, the output of the input terminal 6 of the control circuit 1 becomes High by the resistor 8. The output goes low when short-circuited. The same applies to the input terminals 7 connected to the conductive patterns 51 'and 52' and the resistor 9.

The conductive pattern 4 of the function switching circuit 3
1 ', 42' and 51 ', 52' are previously opened and short-circuited, and a function switching signal is input to the input terminals 6, 7 of the control circuit 1 when the display device is powered on. The control circuit 1 reads the function switching signal and switches the control program accordingly. Therefore, the function of the display device is also switched.

Next, the connection between the printed circuit board 10 and the display element 2 will be described. FIG. 2 shows a terminal (not shown) of the display element 2 and a conductive pattern 11 of the control circuit 1 connected to the connector 1.
FIG. 4 is an explanatory diagram showing a state where connection is made by using a second connection. Here, the conductive pattern 11 of the control circuit 1 and the function switching circuit 3
The conductive patterns 41 ′, 42 ′ and 51 ′, 52 ′ are provided close to the conductive patterns 41 ′, 42 ′ and 51 ′, 52 ′. Do.

FIG. 3 shows a state in which the printed board 10 and the display element 2 are connected by a heat seal 13.
Also in this case, the function switching circuit 3 is short-circuited together with the connection between the control circuit 1 and the display element 2.

Next, the conductive pattern 4 of the function switching circuit 3
A short circuit between 1 ', 42' and 51 ', 52' will be described. FIG. 4A shows the length of the connector 12-1 used for short-circuiting. When the connector 12-1 is used, only the conductive patterns 41 'and 42' are short-circuited. Conductive pattern 5
When the 1 'and 52' are also short-circuited, a connector 12-2 longer than the connector 12-1 may be used as shown in FIG.

The conductive patterns 41 ', 42' and 5
In order to change the short-circuit state of 1 ', 52', the connection position of the connector 12 may be shifted. For example, as shown in FIG. 4 (c), even if the same connector 12-1 as in FIG. 4 (a) is used, the conductive patterns 41 ', 42' and 51 ', 52' are opened by shifting the connection position. Can be done.

Similarly, when the heat seal 13 (see FIG. 3) is used, the length (the number of poles of the heat seal 13) can be changed,
It is advisable to shift the connection position.

In the above embodiment, the conductive patterns corresponding to the terminals 41, 42 and 51, 52 of the function switching circuit 3 shown in FIG. 6 are formed one by one. Good. For example, in FIG.
And two conductive patterns 41 'and 42' corresponding to.

When the conductive pattern is linear as shown in FIG. 5A, the conductive patterns 41 '', 4
2 ''), the length should be increased. When the conductive area of each terminal is increased as described above, the connector 1
Even if the heat seal 2 and the heat seal 13 are slightly displaced, a short circuit can be reliably made.

[0024]

As described above, the display device of the present invention also has a function switching circuit formed on a printed circuit board on which a control circuit is formed. In addition, terminals of the function switching circuit are short-circuited by using a connecting member for connecting the printed board and the display element. Therefore, cost reduction and simplification of assembly and management can be achieved.

Further, since the conductive pattern of the function switching circuit has a large conductive area, even if the connecting member is slightly displaced, a short circuit can be surely made. Therefore, a contact failure can be reduced, and the device has high reliability.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a printed circuit board according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing connection between a printed circuit board and a display element in the embodiment.

FIG. 3 is an explanatory diagram showing another example of a connection between a printed circuit board and a display element.

FIG. 4 is an explanatory diagram showing a short circuit of a function switching circuit performed using a connector in the embodiment.

FIG. 5 is a diagram showing another example of the conductive pattern of the function switching circuit.

FIG. 6 is a configuration diagram of a conventional display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control circuit 2 display element 3 function switching circuit 10 printed circuit board 11 conductive pattern 12 connector 13 heat seal 41, 42, 51, 52 terminal 41 ′, 42 ′, 51 ′, 52 ′ conductive pattern

Claims (3)

[Claims] 1. A display device comprising a display element and a control circuit formed on a printed circuit board, wherein the display circuit has a plurality of functions by controlling the display element by the control circuit, wherein the printed circuit board has a plurality of open terminals. A display device, wherein a function switching circuit is formed, and a function switching signal is output to the control circuit in response to opening and shorting of the open terminal, and the function is switched. 2. A conductive pattern forming a terminal of the control circuit and a conductive pattern forming an open terminal of the function switching circuit are formed close to each other on the printed circuit board. The display device according to claim 1, wherein a conductive member of the function switching circuit is short-circuited by a connecting member for connecting the pattern and the display element. 3. The display device according to claim 2, wherein the function switching circuit includes a plurality of the conductive patterns formed for each of the open terminals.