JPS63290438A - Telephone set - Google Patents

Abstract

PURPOSE:To eliminate the need for brightness adjustment of a display device due to the change in the mounting method of a telephone set by providing a brightness adjustment means adjusting automatically the brightness of the display device depending on the change in the holding method of a handset. CONSTITUTION:In turning a projection of a handset hanger 33 upward to mount a telephone set main body 32 onto a wall face, a cam 34 starts a microswitch 35 by the turning of the hanger 33 to close a switch contact 35a. Thus, a voltage division resistor 21b and a voltage decreasing resistor 23 are connected in parallel and the voltage division voltage to an LCD 1 is decreased. As a result each liquid crystal element chip in the LCD 1 is rotated depending on the voltage division (visual angle is changed) and each character in the LCD 1 by the wall mount of the telephone set main body 32 is adjusted to the brightness easy to see apparently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone, and more particularly to a telephone having a display for displaying characters, numbers, symbols, etc., and a function for adjusting the brightness of the display.

[Conventional technology]

Conventionally, in this type of telephone with a display, when changing the mounting from a desk to a wall, the brightness of the display (contrast adjustment) must be manually adjusted.

[Problem that the invention seeks to solve]

The above-mentioned conventional telephones with display devices have different brightness depending on whether they are used on a desk or mounted on a wall, so each time the method of mounting the telephone changes, The disadvantage is that the brightness of the display must be adjusted manually.

[Means for solving problems]

The telephone of the present invention is a telephone that is equipped with a display device that displays characters, numbers, symbols, etc. and can be mounted on a wall surface, wherein the telephone device detects the wall surface mounting state and uses the detection signal to control the drive voltage of the display device to a predetermined value. The display device further includes a brightness switching and adjusting means for switching and adjusting the brightness of the display device by changing the level.

〔Example〕

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

FIG. 1 is a functional block diagram of a portion for adjusting the apparent brightness of a liquid crystal display according to an embodiment of the present invention.

In the figure, the present embodiment adjusts the apparent brightness of each of the liquid crystal pieces for forming characters inside a liquid crystal display (hereinafter referred to as LCD) 1 by changing the angle from the reference plane (change in diopter angle). It consists of a diopter angle switching circuit 2 and a handset holding method switching mechanism section 3 that sends a switching signal to the diopter switching circuit 2 indicating that the handset holding method has been switched to the wall mounting side.

2 is a circuit diagram showing an example of the diopter angle switching circuit shown in FIG. 1, and FIG. 3 is a schematic configuration diagram showing an example of the handset holding method switching mechanism shown in FIG. 1.

The diopter angle switching circuit 2 shown in FIG. 2 includes voltage dividing resistors 21a and 2 which divide the voltage between the voltage Vcc and the reference voltage (ground voltage) in order to supply a driving voltage that determines the apparent brightness of the LCDI.
1b, a pressure reducing resistor 23 and a microswitch contact 35a connected in series between the voltage dividing point and the reference voltage (earth).

The handset holding method switching mechanism section 3 shown in FIG.
A handset hanger 33 that becomes a hanger for the pigeon set 31 when the telephone main body 32 with DI is mounted on a wall, a cam 34 located inside the telephone main body 32 in conjunction with the handset hanger 33, and a micro switch shown in FIG. 2 by rotation of the cam 34. It is composed of a microswitch 35 that closes a contact 35a.

Next, the operation of this embodiment will be explained.

In order to attach the telephone main body 32 to a wall, the handset hanger 33 is rotated so that the protruding portion thereof faces upward (to the position shown by the broken line in FIG. 3). Handset hanger 33
The rotation of the cam 34 activates the microswitch 35 and closes the microswitch contact 35a shown in FIG. As a result, the voltage dividing resistor 21b and the pressure reducing resistor 23 are placed in parallel, and the divided voltage to the LCDI is reduced. As a result, each liquid crystal element in the LCDI rotates and the diopter angle changes according to this divided voltage.) Each character in the display 1 mounted on the wall of the phone main body 32 automatically adjusts to a brightness that is easy to see. is adjusted to

〔Effect of the invention〕

As explained above, the present invention has a brightness adjustment means that automatically adjusts the brightness of the display according to a change in the method of holding the handset. Letters, numbers on the display without manual brightness adjustment.

This has the effect of making it possible to display symbols etc. in an easy-to-read manner.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of a portion that adjusts the apparent brightness of a liquid crystal display according to an embodiment of the present invention; FIG. 2 is a circuit diagram showing an example of the diopter switching circuit shown in FIG. 1; FIG. 3 is a schematic configuration diagram showing an example of the handset holding method switching mechanism shown in FIG. DESCRIPTION OF SYMBOLS 1... Liquid crystal display (LCD), 2... Diopter angle switching circuit, 3... Handset holding method switching mechanism section, 21.
...Voltage division resistor, 23...Reducing pressure resistor, 31...Handset, 32...Telephone body, 33...Handset hanger, 34...Cam, 35...Micro switch, 3-ri... , 4ri! - 7'What; 7 Nofsu II Figure 1 ￥2 Figure

Claims (1)

[Claims] In a telephone that is equipped with a display that displays letters, numbers, symbols, etc. and can be mounted on a wall, the telephone detects the wall-mounted state and uses the detection signal to switch the drive voltage of the display to a predetermined level to display the display. 1. A telephone set comprising a brightness switching and adjusting means for switching and adjusting the brightness of the device.