JP2002108292A - Portable electronic equipment and display color changing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically change the tone of an indicator for securing the visibility of the indicator for recognizing a radio wave state and a battery state even at the time of turning off a back light. SOLUTION: In a portable electronic equipment loading a color liquid crystal display device with back light, the display color of the indicator, which is displayed in the color liquid crystal display device 23, is saved in a memory 280 when the back light is turned off. The color of high contrast is read from a memory 281 and the indicator is automatically plotted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display color changing mechanism at the time of a backlight in a portable electric device, and more particularly to a portable electronic device having a color liquid crystal display device with improved visibility when the backlight is turned off. It relates to a display color changing method.

[0002]

2. Description of the Related Art In recent years, portable electronic devices (portable telephones, mobile communication devices, etc.) equipped with a color liquid crystal display device and a backlight and having an interface capable of changing a background color and a wallpaper as desired by the user have been increasing. . However, in such portable devices, since power consumption tends to increase, a method of controlling on / off of a backlight in accordance with the brightness of a use environment in order to suppress power consumption has been considered (eg, And JP-A-5-61835).

However, in a conventional color liquid crystal display of a portable electronic device, if the backlight is turned off, the visibility is greatly reduced depending on the combination of the background colors, and the state of the radio wave and the state of the battery are displayed. There is a problem that the display of the indicator or the like becomes difficult to see.

As described in Japanese Patent Application Laid-Open No. 2000-155309, a plurality of color filters which react or do not react with a plurality of light sources are stacked to display a partial background of a display character (color pattern). In some cases, the display characters are displayed on the liquid crystal display by making the display characters stand out according to the background. The prior art described in this publication requires a plurality of color filters and a plurality of light sources in which a predetermined pattern is formed, which not only increases the cost but also, depending on the color of the background color, reverses the display characters. There is a problem.

[0005]

In a portable electronic device having a color liquid crystal display device and a backlight, if the backlight is turned off, the visibility is greatly reduced depending on the combination of the background colors. There has been a problem that it is difficult to see a display such as an indicator indicating a state or a battery state.

Further, in a portable electronic device having an interface capable of switching the display color according to the user's preference, the visibility when the backlight is turned off is lowered depending on the display color specified by the user, so that the visibility is greatly reduced. There was a problem. When the visibility is reduced, the user explicitly performs the act of turning on the backlight, so that useless power consumption occurs and the battery life is reduced.

The present invention has been made in order to solve the above-mentioned conventional problems. Therefore, even when the backlight is turned off, in order to ensure the visibility of the indicator for confirming the state of radio waves and the state of the battery, the indicator is used. It is an object of the present invention to provide a portable electronic device and a display color changing method of the portable electronic device, which can automatically change the color tone of the electronic device to a high contrast.

[0008] In a transflective color liquid crystal display device, a color pattern emerges in the background only when necessary, thereby emphasizing the indicator display of characters, figures, and the like, thereby obtaining a good image display. It is an object to provide a display color changing method for an electronic device and a portable electronic device.

[0009]

In order to achieve the above object, a portable electronic device according to the present invention is provided in a portable electronic device equipped with a color liquid crystal display device with a backlight. The display color of the indicator displayed on the display device is automatically changed to a high-contrast color tone.

The display color of an indicator displayed on the color liquid crystal display device is automatically changed to an original color tone when the backlight is turned on.

In order to achieve the above object, a display color changing method of a portable electronic device according to the present invention is directed to a portable electronic device equipped with a color liquid crystal display device with a backlight, wherein the color liquid crystal display is displayed when the backlight is turned off. After the display color of the indicator displayed on the device is saved in the memory, a high-contrast color is read from the memory, and the indicator is automatically drawn.

Further, when the backlight is turned on, the display color of the indicator displayed on the color liquid crystal display device retracted to the memory is restored to perform automatic drawing.

According to the present invention, when the backlight of the color liquid crystal display device of the portable electronic device is turned off, the display color of the indicator can be automatically changed to a high-contrast color tone with high visibility. When the backlight is turned on, the color tone is automatically restored. further,
It is possible to prevent the indicator from being difficult to see due to a decrease in contrast when the backlight is turned off, and to reduce the power consumption by reducing the number of operations for the user to explicitly turn on the backlight by performing a key input or the like when the backlight is turned off. it can.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an embodiment in which a mobile phone is used as an example, and is a block diagram illustrating an internal configuration of the mobile phone. The mobile phone shown in FIG. 1 has an antenna 20 for communicating with a base station, a controller 22 for communicating with the base station via a radio circuit 21 for transmitting and receiving radio waves to and from the antenna 20, and a color liquid crystal display for displaying various information. A device (hereinafter referred to as an LCD) 23, a key input unit 24 for outputting key input data to the controller 22, a microphone 25 for inputting voice during a call or the like, and a receiver 26 for outputting voice of the other party during a call; It comprises a backlight 27 for performing backlight display on the LCD 23 and an internal memory 28. The controller 22 includes a wireless unit 21 and an LCD 2
3, a function to control the key input unit 24, the microphone 25, the receiver 26, the backlight 27, and the internal memory 28. In the internal memory 28, in addition to the area for storing the telephone number, the color table save area 28 used for the control of the present invention.
0 and a high contrast color table 281 are provided.

The backlight 27 includes a thin tube fluorescent lamp and an LE.
D (Light Emitting Diode) or the like is used.
The entire back surface of the LCD 23 is illuminated via a diffusion plate, and light is radiated from the side of the diffusion plate, or illuminated from the back of the LCD 23 by another method, so that display characters and indicator marks displayed on the LCD 23 can be seen. Easy to use.

Further, a rod antenna or the like is used as the antenna 20. The antenna 20 is housed in a portable telephone or pulled out during a call to talk. The radio unit 21 is composed of a transmission unit and a reception unit, and has a PDC (Personal Digit
al Cellular) and PHS (Personal Handyphone Syste)
According to the definition of m), the audio signal from the microphone 25 is encoded, converted into a high-frequency signal by the transmission unit as a baseband signal, and transmitted to the base station through the antenna 20. In addition, a reception wave from a base station can be received by the antenna 20, a high-frequency signal can be converted to a baseband signal by a reception unit, and a sound signal can be output from the receiver 26 via the controller 22. Before a call, an incoming call signal is exchanged according to a predetermined protocol in order to secure a call path in relation to the base station.

In the portable telephone having such a configuration,
When the power of the mobile phone is turned on by operating the power button switch of the key input unit 24, the controller 22 turns on the backlight 27 and makes the display on the LCD 23 bright. Then, based on a key operation from the key input unit 24, the other party's telephone number is input or called, and a call is made or a message is sent.

When the power of the mobile phone is turned off by operating the power button switch of the key input unit 24, the controller 22 turns off the backlight 27. When key operation is started from the key input unit 24 and there is no key operation for a certain period of time, the backlight 27 is turned off as timeout. In some cases, the backlight 27 is turned off when there is external lighting in the external environment or when there is no audio input.

As described above, a measure is taken to extend the life of the battery of the portable telephone by the illumination of the backlight 27. The control for changing the display color of the LCD 23 when the backlight is turned off will be described. In the following embodiment,
A method of displaying a white indicator on a black background as a high contrast color tone will be described.

FIG. 2 shows an example of the display contents of the LCD 23. On the color liquid crystal display screen of the LCD 23, in addition to date and time information, an indicator 23 for displaying a radio wave condition is displayed.
0, a battery status indicator 231 and the like are displayed. FIG. 2 shows a state of backlight display.

FIG. 3 is a flowchart showing a color tone changing sequence when the backlight is turned off according to the present invention. This sequence is executed as an additional process in the backlight extinguishing process performed by the controller 22 several seconds after the operation of the backlight OFF key of the key input unit 24.

In the backlight extinguishing process (S20), the indicator 23 is used in preparation for the next lighting of the backlight.
0, 231 is saved in the color table save area 280 of the internal memory 28 (S2).
1). After the evacuation process is completed, the currently displayed indicators 230 and 231 are temporarily deleted (S2).
2). After this erasing process, a high-contrast color (black in this example) is read from the high-contrast color table 281 stored in the internal memory 28 (S23). Then, using the high-contrast color read from the high-contrast color table 281, the indicator 2 is used.
30 and 231 are drawn again (S24). Thereafter, if there is a continuation of the backlight extinguishing process, the process is executed (S2).
5) Do it.

FIG. 4 is a flowchart showing a color tone return sequence when the backlight is turned on. This sequence is
The backlight O of the key input unit 24 after the backlight is turned off
By operating the N key, the process is immediately executed as an additional process in the backlight lighting process performed by the controller 22.

In the backlight lighting process (S30), the saved color table is read in order to restore the colors saved in the color table save area 280 of the internal memory 28 when the backlight is turned off (S31). After this reading, the currently displayed indicator is deleted (S3).
2). Then, after the erasing process, the color table save area 28
Using the color read from 0, the indicator 230,
231 is redrawn (S33). Thereafter, if there is a continuation of the backlight lighting process, the process is executed (S34).

FIG. 5A is an example of an indicator display when the backlight is turned off when the present invention is not applied.
FIG. 5B shows an example of an indicator display when the backlight is turned off when the present invention is applied, and white indicators 230 and 23 on a black background so that the color tone becomes high contrast.
1 has been drawn.

[0026]

According to the present invention, it is possible to prevent the indicator from being difficult to see due to a decrease in contrast when the backlight is turned off. Thus, when the backlight is turned off, it is possible to reduce the number of operations for explicitly turning on the backlight by performing a key input or the like by the user, thereby reducing power consumption. When the backlight is turned on, the backlight can be restored.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an internal configuration of a mobile phone according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display example on a liquid crystal display device of a mobile phone.

FIG. 3 is a flowchart showing a backlight extinguishing processing procedure of the mobile phone to which the present invention is applied;

FIG. 4 is a flowchart showing a backlight lighting processing procedure of the mobile phone to which the present invention is applied.

FIG. 5 is a diagram showing a display example of a color liquid crystal display device to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 20 antenna 21 radio section 22 controller 23 LCD (color liquid crystal display) 24 key input section 25 microphone 26 receiver 27 backlight 28 internal memory 280 color table save area 281 high contrast color table

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Claims (4)

[Claims] 1. In a portable electronic device equipped with a color liquid crystal display device with a backlight, when the backlight is turned off, a display color of an indicator displayed on the color liquid crystal display device is automatically changed to a high contrast color tone. A portable electronic device characterized by the following. 2. The portable electronic device according to claim 1, wherein when the backlight is turned on, a display color of an indicator displayed on the color liquid crystal display device is automatically changed to an original color tone. 3. In a portable electronic device equipped with a color liquid crystal display device with a backlight, when the backlight is turned off, after a display color of an indicator displayed on the color liquid crystal display device is saved to a memory, A display color changing method for a portable electronic device, comprising reading out a high-contrast color and automatically drawing the indicator. 4. The portable electronic device according to claim 3, wherein when the backlight is turned on, the display color of the indicator displayed on the color liquid crystal display device evacuated to the memory is restored to perform automatic drawing. Display color change method.