JPH09247727A - Radio selective calling receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio selective calling receiver employing an LCD in which a low display contrast is set when a back light goes off and the contrast is set higher when the back light is lighted in order to solve the problem that the contrast is low and the user is difficult to observe he display when the back light is lighted. SOLUTION: Based on a signal switching ON/OFF a back light 7 from an input section 10, a control section 4 sets a usual contrast to an LCD driver 5 as a contrast value when a back light goes off and sets a contrast higher than the usual contrast to the LCD driver 5 as a lighting-state contrast when a back light is lighted. An LCD 6 makes a display depending on the set contrast.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an LC as a display unit.
The present invention relates to a radio selective calling receiver equipped with a D (Liquid Crystal Display), and more particularly to a radio selective calling receiver capable of providing an easy-to-see display by setting a high contrast when a backlight is turned on.

[0002]

2. Description of the Related Art As a display unit of a conventional radio selective call receiver, an LCD (Liquid Crystal Display, Liquid Crystal Display) is used.
play) is often used. Further, an LCD driver is provided as a display control means in the LCD, and further,
LCD as a backlight for lighting in dark surroundings
An EL (Electroluminescence) light emitting element is provided in the lower layer.

In the radio selective calling receiver having the above-mentioned structure, the display contrast (shading of display) on the LCD is displayed.
The control unit sets the contrast value in the LCD driver, and the LCD driver controls the display contrast of the LCD based on the set contrast value.

Here, a conventional method of setting the contrast value in the radio paging receiver will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a method of setting a contrast value in a conventional radio selective calling receiver. As shown in FIG. 4, in the conventional radio paging receiver, the display contrast is controlled by the control unit in accordance with the instruction from the input unit.
One of the contrast values of the steps is selected and set in the LCD driver. In the example of FIG. 4, the contrast value (C) is set to b in the above-mentioned five stages.

Further, when changing the display contrast, the user generally changes the contrast value setting of the LCD driver via the control section by operating a button or the like.

[0006]

However, in the above-described conventional radio selective call receiver, if the contrast is set when the backlight is turned off, the contrast of the LCD itself does not change when the backlight is turned on. There is a problem in that the contrast is visually reduced due to the light transmitted through the light, and the display becomes thin and difficult to see. In order to make it easy to see, the user had to perform an operation of changing the setting of the contrast value every time the backlight was turned on, which was troublesome.

The present invention has been made in view of the above situation, and either a low contrast value for turning off the light or a high contrast value for turning on the light is prepared in advance according to ON / OFF of the backlight. It is an object of the present invention to provide a radio selective call receiver capable of providing easy-to-see display by using the display.

[0008]

The invention according to claim 1 for solving the problems of the conventional example is a radio selective call receiver having a liquid crystal display provided with a backlight, and a display contrast in the liquid crystal display. Is low when the backlight is off, and is high when the backlight is on.Display can be performed with an appropriate contrast corresponding to when the backlight is off or on, and when the backlight is on. It is possible to prevent the display from fading and to make the display easier to see.

According to a second aspect of the present invention for solving the problems of the conventional example, a liquid crystal display as a display unit, a backlight as illumination of the liquid crystal display, and a contrast value set based on the liquid crystal display are used. In a radio selective call receiver including a driver that drives a liquid crystal display, a control unit that sets the contrast value in the driver, and a switch that switches ON / OFF of the backlight, the control unit includes a switch If the light is switched to the off side, the first
And a second contrast value higher than the first contrast value in the driver when the switch is switched to the lighting side. , The display can be displayed with an appropriate contrast corresponding to when the backlight is turned off or turned on. Especially, when the backlight is turned on, the display contrast of the liquid crystal display is increased to prevent the display from becoming thin and difficult to see, and an easy-to-read display. It can be performed.

[0010]

Embodiments of the present invention will be described with reference to the drawings. The radio selective call receiver according to the embodiment of the present invention prepares two kinds of contrast values corresponding to the time when the backlight is turned off and the time when the backlight is turned on, and the backlight is linked with ON / OFF of the backlight. A low contrast value is set in the LCD driver when the display is turned off, and a high contrast value is set when the backlight is turned on so that the display is easy to see.

FIG. 1 is a block diagram showing the configuration of a radio selective calling receiver (this device) according to an embodiment of the present invention. Radio selective call receiver according to an embodiment of the present invention (this device)
As shown in FIG. 1, the basic configuration is the same as that of a conventional radio paging receiver, and the RF unit 1 for receiving a signal is compared with the paging number in the received signal and its own paging number. If they match, a decoder 2 that decodes a signal, a storage unit 3 that stores received information, a control unit 4 that performs processing such as calling and message display during self-reception, and an LCD driver 5 that performs display control on the LCD 6 And LCD as the display
(Liquid Crystal Display) 6 and EL (Electrolumin
A backlight 7 including a light emitting element, an amplification unit 8 that amplifies a calling signal, and a speaker 9 that outputs a calling sound.
And an input unit 10 for inputting power, ON / OFF of the backlight 7, and the like. The operation of the control unit 4 of this device is different from the conventional one.

Next, each component will be specifically described. The backlight 7 is connected to the control unit 4, and the control unit 4 switches ON / OFF of the backlight 7 based on a signal from the input unit 10 as in the conventional case. Also, the LCD driver 5 is
According to the contrast value set by the control unit 4, L
It controls the contrast of the CD6.

The control unit 4 which is a characteristic part of the present apparatus
Is for setting a contrast value in the LCD driver 5. In particular, in this device, a different contrast value is set between when the backlight 7 is turned on and when the backlight 7 is turned off by a signal input from the input unit 10 to switch the backlight 7 on and off. The contrast value is set higher (darker) than when it is off.

Here, a method of setting the contrast value in this apparatus will be described with reference to FIG. FIG. 2 is an explanatory diagram showing a method of setting a contrast value in this apparatus. As shown in FIG. 2, in this apparatus, as in the conventional radio selective call receiver shown in FIG. 4, five levels of contrast values are provided as the settable contrast values.

In the control unit 4, two kinds of values, a normal contrast value (C1) and a lighting contrast value (C2), are registered in advance, and the backlight ON / OFF from the input unit 10 is turned on. Backlight 7 based on the signal
When the backlight is turned off, C1 is set as the contrast value in the LCD driver 5, and when the backlight 7 is turned on, C2 is set. Here, b is registered as C1 and e is registered as C2 in the control unit 4.

As a feature of this apparatus, the contrast value (C2) at the time of lighting is set higher than the normal contrast value (C1), and when the backlight is turned on, the contrast is increased so that the display becomes dark.

As a result, when the backlight 7 is turned off, the LCD 6 displays with a normal contrast, and when a signal instructing to turn on the backlight 7 is input from the input unit 10, control is performed. Part 4 is LCD driver 5
Since the contrast value (C2) at lighting is set to
D6 is a display with a higher contrast than usual, and a display that is easy to see can be performed even when the backlight is turned on.

Incidentally, here, two kinds of contrast values C1
Although C2 and C2 are registered in the control unit 4 in advance, it is also possible for the user to register an arbitrary contrast value by operating the input unit 10.

Next, a method of setting the contrast value in the control section 4 of the present apparatus will be described with reference to FIG. FIG.
FIG. 6 is a flowchart showing a method of setting a contrast value in the control unit 4. Power is turned on (100)
Then, the control unit 4 sets the normal contrast value (C1) as the contrast value (S) in the LCD driver 5 (S ← C1, 102).

Then, the control unit 4 gives an instruction for initial display to L
When it is sent to the CD driver 5 (104) and the initial display is performed for a preset time, the initial display is terminated and a standby display instruction is sent to the LCD driver 5 (106).

Then, the control section 4 judges whether or not a signal for instructing the lighting of the backlight 7 is inputted from the input section 10, that is, whether or not the backlight 7 is ON (1
08), if the backlight 7 is ON (in the case of Yes), the lighting contrast value (C2) is set as the contrast value S in the LCD driver 5 (S ← C2,
110). As a result, high-contrast display is performed when the backlight is turned on. If the backlight 7 is not lit (No), the contrast value remains C1.

Then, the control section 4 judges whether or not the signal for instructing the turning off of the backlight 7 is inputted from the input section 10, that is, whether the backlight 7 is off (108), and if it is off (Yes). ,), LCD
The normal contrast value (C1) is set as the contrast value S in the driver 5 (S ← C1, 114), and the process 108
And the same processing is repeated. In this way,
The processing in the control unit 4 of this device is performed.

According to the radio selective calling receiver according to the embodiment of the present invention, the control unit 4 is responsive to the signal from the input unit 10 for switching the ON / OFF of the backlight 7 when the backlight 7 is turned off. , A normal contrast value (C1) is set in the LCD driver 5 as the contrast value, and when the backlight 7 is turned on, the LCD driver 5
Set the contrast value (C2) at lighting, which has a higher contrast than the normal contrast value, to the LCD driver 5
However, since the LCD 6 is driven and displayed based on the set value, the backlight can be turned on by turning on the backlight lighting switch without the need for the user to successively change the contrast setting. There is an effect that the display can be made easy to see depending on whether the display is turned on or off.

[0024]

According to the invention described in claim 1, the display contrast of the liquid crystal display is lowered when the backlight is turned off and is increased when the backlight is turned on. Therefore, an appropriate contrast corresponding to when the backlight is turned off or turned on. There is an effect that the display can be performed by, and the display is prevented from being thinned when the backlight is lit, and the display can be easily viewed.

According to the second aspect of the present invention, the control section comprises:
When the switch is turned off, the first contrast value is set in the driver, and when the switch is turned on, the second contrast value higher than the first contrast value is set. Therefore, it is possible to display with an appropriate contrast corresponding to when the backlight is turned off or turned on. Especially, when the backlight is turned on, the contrast is made higher than when the backlight is turned off, and the display becomes thin and difficult to see. There is an effect that the display can be prevented and the display can be performed easily.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a radio selective calling receiver (this apparatus) according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a method of setting a contrast value in the present apparatus.

FIG. 3 is a flowchart showing a method of setting a contrast value in the control unit 4.

FIG. 4 is an explanatory diagram showing a method of setting a contrast value in a conventional radio selective calling receiver.

[Explanation of symbols]

1 ... RF section, 2 ... Decoder, 3 ... Storage section, 4 ... Control section, 5 ... LCD driver, 6 ... LCD, 7 ... Backlight, 8 ... Amplification section, 9 ... Speaker, 10 ... Input section

Claims (2)

[Claims] 1. A radio selective calling receiver having a liquid crystal display with a backlight, wherein display contrast in the liquid crystal display is low when the backlight is off and high when the backlight is on. Radio selective call receiver. 2. A liquid crystal display as a display unit, a backlight as illumination of the liquid crystal display, a driver for driving the liquid crystal display based on a set contrast value, and the contrast value set in the driver. Control unit and lighting of the backlight /
In a radio selective calling receiver having a switch for switching off and off, the control unit sets a first contrast value to the driver and turns on the switch when the switch is switched to the off side. The radio selective calling receiver, which is a control unit that sets a second contrast value higher than the first contrast value to the driver when switched to the side.