JPH052375A - Radio selective calling receiver - Google Patents

Abstract

PURPOSE:To optionally set the visual angle of a liquid crystal display unit. CONSTITUTION:A signal radio wave received by an antenna 6 is demodulated by a reception part 7 and compared by a control part 8 with a self-calling number in a storage part 10 and when the calling number in the received signal matches the self-calling number, calling annunciation is performed by a method set in the storage part 10 to display the message in the received signal. An annunciator driving part 9 amplifies an annunciation signal from the control part 8 and drives a speaker 14, a light emitting diode 15 and an exciter 16. A liquid crystal display signal outputted by the control part 8 is converted by a liquid crystal driving part 11 into a driving signal to drive the liquid crystal display unit 2. A visual angle control part 13 controls a voltage supplied from the voltage conversion part 12 to the liquid crystal driving part 11 to vary the visual angle of the liquid crystal display unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal driving unit in a radio selective calling receiver having a liquid crystal display.

[0002]

2. Description of the Related Art In a conventional radio selective call receiver with a liquid crystal display, a predetermined drive voltage is applied to the liquid crystal display, and therefore the viewing angle of the liquid crystal display is constant.

[0003]

In the conventional radio selective call receiver with a liquid crystal display, a predetermined viewing angle is set in the liquid crystal display, and it is difficult to see the display depending on the situation of use. was there.

An object of the present invention is to allow the viewing angle of a liquid crystal display to be set arbitrarily.

[0005]

In order to achieve the above object, the present invention provides a radio selective call receiver having a liquid crystal display, wherein the means for changing the drive voltage applied to the liquid crystal display is a voltage The conversion unit, the viewing angle control unit, and the liquid crystal drive unit are included.

[0006]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a radio selective calling receiver according to an embodiment of the present invention. 1, a liquid crystal display 2 for displaying a received message, a power switch 3 for turning on / off the operation of the receiver, a readout switch 4 for stopping a ringing tone and displaying a message, and a viewing angle are adjusted on a main body 1 in FIG. And a dial 5 for doing so.

FIG. 2 is a block diagram of a radio selective calling receiver according to an embodiment of the present invention. In FIG. 2, the signal radio wave received by the antenna 6 is demodulated by the receiving unit 7, compared with the self-call number stored in the storage unit 10 by the control unit 8, and when the signal number matches the call number in the received signal. The call notification is performed by the method set in the storage unit 10, and the message in the received signal is displayed on the liquid crystal display 2. The alarm drive unit 9 amplifies the alarm signal from the control unit 8 and drives the speaker 14, the light emitting diode 15, and the vibrator 16. The liquid crystal display signal output from the control unit 8 is converted into a drive signal in the liquid crystal drive unit 11, and the liquid crystal display 2 is driven. The voltage conversion unit 12 obtains a voltage required to operate the control unit 8, the storage unit 10, and the liquid crystal drive unit 11. In the viewing angle control unit 13, the viewing angle of the liquid crystal display 2 is changed by controlling the voltage supplied from the voltage conversion unit 12 to the liquid crystal driving unit 11.

FIG. 3 is a circuit diagram of the viewing angle control unit 13 used in the radio selective calling receiver according to the embodiment of the present invention. In FIG. 3, the variable resistor 17 and the fixed resistor 1
The voltage supplied from the voltage conversion unit 12 is divided by 8 and supplied to the liquid crystal drive unit 11. The variable resistor 17 is made variable by the dial 5. For example, when the output from the voltage conversion unit 12 is 3V, the drive voltage applied to the liquid crystal display 2 is set from 1.5V to 3V by setting the variable resistor 17 to 100 kΩ and the fixed resistor 18 to 100 kΩ. Can change.

[0010]

As described above, according to the present invention, the user can set an arbitrary viewing angle by changing the driving voltage of the liquid crystal display. It is possible to obtain the effect that the property can be enhanced.

[Brief description of drawings]

FIG. 1 is an external view of a radio selective calling receiver according to an embodiment of the present invention.

FIG. 2 is a block diagram of a radio selective calling receiver according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a view angle control unit 13 used in the radio selective call receiver according to the embodiment of the present invention.

[Explanation of symbols]

1 body 2 Liquid crystal display 3 power switch 4 readout switch 5 dial 6 antenna 7 Receiver 8 control unit 9 Alarm drive 10 memory 11 LCD drive 12 Voltage converter 13 Viewing angle controller 14 speakers 15 Light emitting diode 16 vibrators

Claims (2)

[Claims] 1. A radio selective calling receiver having a liquid crystal display, comprising means for changing a driving voltage applied to the liquid crystal display. 2. The radio selective call receiver according to claim 1, wherein the means for changing the drive voltage applied to the liquid crystal display comprises a voltage conversion section, a viewing angle control section, and a liquid crystal drive section.