JPS5833315A - Channel display device - Google Patents

Abstract

PURPOSE:To realize the discrimination for channel selection even at a place distant away from a TV picture receiver, by securing the light emission only for the channel under selection with the 1st color with use the same number of light emitting elements capable of emitting double colors as the number of channels and having the light emission of the 2nd color for other channels. CONSTITUTION:A control circuit 6 generates the output of a low level only through an output terminal corresponding to a closed channel selection switch 7 and produces the output of a high level through other terminals. A light emission driving circuit 11 corresponding to the nonselected channel CH makes a transistor TR12 and breaks a TR13 respectively. Then a current is flowed to a light emitting diode 5 of green color to perform a display of a green color. For the selected channel CH through which the output of a low level is produced, the circuit 11 breaks the TR12 and makes the TR13 and flows a current to a light emitting diode 4 of red color to perform a display of red color. At the same time, the circuit 11 supplies the prescribed voltage to an electronic tuner 9. In such way, the channel CH under selection can be discriminated even at a place distant away from a TV picture receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a channel display device used in a television receiver, and provides a device that can display a currently selected channel in an easy-to-understand manner even from a remote location.

The channel display device used in conventional television receivers has a display board displaying the channel number in each of the multiple channel display windows, and only the selected channel is displayed from the back side using a neon lamp etc. The idea was to illuminate the screen and display it brightly. However, with such conventional devices, the channel display characters cannot be read when viewing from a distance from the television receiver, and only one display board is brightly illuminated. This has the disadvantage that it is extremely difficult to know which channel is being selected.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a display device that can display the currently selected channel in an easy-to-understand manner even from a distance from a television receiver, thereby eliminating such conventional drawbacks. be.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 1 is a front view of the display part of the channel display device, and here, 12 light emitting elements 1 for 12 channels are lined up in pairs with channel display characters 22 and channel selection switch buttons 3. It is set up. Each light emitting element 1
For example, a device that can selectively display two colors such as red and green is used. For example, the second
As shown in the figure, a light emitting diode or the like in which a red light emitting diode element 4 and a green light emitting diode element 6 are assembled in one mold package can be used. Of these light emitting elements 1, only those corresponding to the currently selected channel are controlled to emit light in a first color, for example, red, and all the remaining light emitting elements are controlled to emit light in a second color, for example, green.

An example of such a light emission control circuit is shown in FIG.

Here, 6' is a switch for selecting a channel, 7 is a control circuit for controlling channel selection, and 8 is a variable resistor for generating a voltage for channel selection to be applied to the electronic tuner 9. The control circuit 7 generates a low level (earth level) output only from the output terminal corresponding to the switch 6 pressed and closed when selecting a station, and discards high level output from the other output terminals. A current is applied only to the variable resistor 8 connected to the low level output terminal, a preset channel selection voltage is taken out from the intermediate terminal of the variable resistor 8, and an electronic voltage is passed through the reverse current prevention diode 1o. The channel is controlled to be selected by the time applied to the tuner 9. Here, the output of each output terminal of this control circuit 7 is added to the base of one of the transistors 12 and 13 connected to the differential amplifier circuit of the display drive circuit 11, and the collector of each is connected to the base of one of the transistors 12 and 13 connected to the differential amplifier circuit of the display drive circuit 11. The red light emitting diode element 4 and the line light emitting diode element 6 are connected in advance. Light emission drive circuit 1
1 is provided for each channel.

In this way, in the light emitting drive circuit 11 corresponding to a channel that is not selected and for which a high level output is being generated by the control circuit 7, the transistor 12 is made conductive and the transistor 13 is cut off, and the green light emitting diode element 6 is turned on. By passing a current and driving it, a green display is produced, and in the light emitting drive circuit 11 corresponding to the selected channel where a low level output is generated, the transistor 12 is cut off and the transistor 13 is made conductive. By applying current to the red light emitting diode element 4 and driving it, a red display can be made.

Thus, in the channel display section, only one of the 12 light emitting elements 1 corresponding to the selected channel emits red light, and all the others emit green light.

Therefore, the viewer can know which channel is being selected by seeing which light emitting element 1 emits red light. Moreover, at this time, even if the channel display character 2 is so far away that it cannot be read,
Since all of the two light emitting elements 1 emit red or green light, it is possible to clearly know in which position of the 12 arrays the light emitting element 1 is emitting red light by comparing them. This makes it possible to know the selected channel very easily even from a remote location.

Note that in the above embodiments, a light emitting diode was used as the light emitting element, but any other light emitting element such as a lamp or a neon lamp may be used. Further, as the display driving circuit, various switching circuits may be used in addition to the differential amplifier circuit as described above. Furthermore, the arrangement of such light emitting elements may be linear, nine circumferential, or any other arbitrary shape.

As described above, according to the present invention, light emitting elements capable of emitting two colors are used for the same number of channels, only the one corresponding to the currently selected channel is made to emit light in the first color, and the remaining ones are emitted in the first color. Since the light is emitted in the second color, the second color can be used even when viewing from a distance from the television receiver.
By looking at the position of the first color in the color array, the selected channel can be known, and an easy-to-understand display can be performed.

[Brief explanation of drawings]

1 is a front view of a channel display device according to an embodiment of the present invention, FIG. 2 is a sectional view of an example of a light emitting element used in the device, and FIG. 3 is a circuit diagram of the device. ...Light emitting element, 2...Channel display characters, 3...Tuition selection switch button, 4...
・Red light emitting diode element, 5...01. Green light emitting diode element, 6, switch, 7, control circuit, 8, variable resistor, 9, electronic tuner, 11, ,,,,
Display drive circuits, 12, 13, . transistor. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
figure

Claims (1)

[Claims] A plurality of light emitting elements capable of displaying two colors are arranged and arranged for each selected channel, and only the light emitting element corresponding to the selected channel emits light in the first color, and the remaining channels are illuminated. A channel display device characterized in that a light emitting element emits light in a second color.