JP2002199078A - Portable electronic unit and mobile radio telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic unit that reduces power consumption and extends the use time of a battery without reducing the visibility of a screen and display definition. SOLUTION: The portable electronic unit is provided with a processing means (S8) processing display information including at least a character and the background of the character and a display control means (S13) displaying display information supplied by the processing means on a light emitting type display device using organic EL. The processing means has a correction means (S9) correcting the luminance of the character and that of the background of the character in display information so that the average luminance of the background becomes smaller than the average luminance of the character.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device such as a portable telephone and a portable personal computer, and more particularly to a portable electronic device using a self-luminous display device.

[0002]

2. Description of the Related Art In mobile communication systems for mobile phones, i
Mode, connection to information services such as EZ Web. An information service is a service in which various types of information, such as Internet homepage information, can be enjoyed by a mobile terminal alone. Transaction services such as mobile banking, database systems such as restaurant search, living information systems such as news, and entertainment systems. Indicates a character, voice, and image information service having a genre such as.

In recent years, mobile terminals using a color liquid crystal display device have been commercialized in order to effectively use the contents of the information service, and the spread of color display contents has been rapidly expanding.

[0004] Against this background, a display device using an organic EL has been developed as a color display device for a mobile terminal. The organic EL is a self-luminous element using light emitted when electrons and holes are injected from the outside and excitons excited by their recombination energy shift from an excited state to a ground state. The organic EL display device has features such as thinness, light weight, fast response speed, wide viewing angle, and low cost, and is expected to be a color display device for a next-generation mobile terminal.

However, a mobile terminal using the organic EL display device has a problem that power consumption cannot be reduced sufficiently. In a self-luminous display device such as an organic EL,
Since white display, that is, light emission, is directly reflected in power consumption, a white-based screen consumes more power than a black-based screen. Many contents of information services are based on white, and the self-luminous display device such as the organic EL cannot sufficiently reduce the power consumption.

FIG. 7 is a block diagram showing a configuration of a conventional mobile radio telephone device using an organic EL as a display device. The mobile radio telephone device includes an antenna unit 5 for transmitting and receiving radio signals.
1. an RF unit 52 for modulating and demodulating a radio signal; a baseband unit 53 for separating an audio signal and a control signal and extracting information for displaying a screen from the control signal; an audio unit 54 for inputting and outputting audio; Speaker 5 connected to this
5, a microphone 56, a storage unit 57 for storing information for displaying a screen, a control unit 5 for controlling and processing each block
8. Operation keys 60 for operating information for displaying a screen, a display device 61 using organic EL, an organic EL display device 61 and an organic EL display device operating the operation keys 60 /
An operation key driver 59 is provided.

FIG. 8 shows a processing flow from reception of a radio signal of an information service to display of a screen in the conventional mobile radio telephone apparatus. A radio signal including information for displaying a screen transmitted from the base station is received and demodulated by the antenna unit 51 and the RF unit 42. The demodulated signal is separated into an audio signal and a control signal by the baseband unit 53, and information for displaying a screen is extracted from the control signal.
To memorize. The information for displaying the stored screen is processed, a bitmap is generated, and this is stored in the storage unit 57 again. The stored bitmap is taken out and displayed on the organic EL display device 61.

FIG. 9 shows an example of a conventional information service display screen obtained by the above processing flow. The display screen 71 of the information service of the present example includes a white background 72, black character information 73, and image information 74. It is a general tendency of the display screen of personal computers in recent years that the background is white, and the content of the color screen of the information service is also created according to this tendency. Liquid crystal display devices, which are currently the mainstream of color display devices for mobile radiotelephone devices, have no correlation between the display content of the screen and the power consumption, and the power consumption is constant. On the other hand, in the organic EL display device, there is a correlation between the increase in the display (light emission) area and the power consumption. For example, in a screen with a white background in FIG. 9, power is consumed in almost all pixels in the screen.

As described above, in a conventional mobile radio telephone device using an organic EL display device, there is a correlation between information for displaying a screen and power consumption, and power consumption in an information service or the like. Since information for displaying many screens is mainstream, power consumption cannot be reduced sufficiently.

[0010] Further, a screen of the device status of the mobile radio telephone device, that is, the strength of the base station radio wave, the remaining battery level, the date, the time, the setting status of functions (public telephone mode, answering machine status, etc.), standby, and call The graphics to be displayed and the operation screen for selecting functions are also displayed with a large white tone in order to obtain a display affinity with the information service, and power consumption cannot be reduced sufficiently.

[0011]

In many cases, the contents of information services are displayed on a white-tone screen, and the power consumption of a self-luminous display device such as an organic EL cannot be sufficiently reduced.

In addition, the screen of the state of the mobile radio telephone apparatus and the screen for operation for selecting a function are often displayed in a white tone, and a self-luminous display apparatus such as an organic EL consumes sufficient power. Could not be reduced.

The present invention has been made in view of such a problem, and a portable electronic device capable of reducing power consumption and extending battery usage time without deteriorating the visibility of a screen and the display quality. The purpose is to provide.

[0014]

In order to achieve the above object, a portable electronic device according to the present invention includes a conventional display mode,
In the character display screen, a mode is provided in which a screen based on white tone is corrected to a screen based on black tone and displayed.

That is, a portable electronic device according to the present invention is a self-luminous display device, processing means for processing display information including at least a character and a background of the character, and displaying the display information provided by the processing means on the display device. Display control means for displaying on the device, wherein the processing means corrects the luminance of the character and the background of the character in the display information so that the average luminance of the background is smaller than the average luminance of the character. It has correction means. For example, the correction unit corrects a character in the display information to white and a background of the character to black.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a mobile radio telephone device according to an embodiment of a portable electronic device according to the present invention using an organic EL as a display device. The mobile radio telephone device
An antenna unit 11 for transmitting and receiving a radio signal; an RF unit 12 for modulating and demodulating a radio signal; a baseband unit 13 for separating an audio signal and a control signal and extracting information for displaying a screen from the control signal; An audio unit 14 for input / output, a speaker 15 and a microphone 16 connected thereto, a storage unit 17 for storing information for displaying a screen and a display mode described later, and a control unit 1 for controlling and processing each block
8. Rechargeable battery remaining power detector 1 for detecting the remaining power of the rechargeable battery
9. Operation keys 2 for operating information for displaying a screen
1. Display device 22 using organic EL, organic EL display device 2
2 and an organic EL display / operation key driver 20 for operating the operation keys 21.

Here, the structure of the organic EL display device will be described. Organic EL display devices are similar to liquid crystal display devices.
Matrix data lines and address lines are formed on a glass substrate by a thin film process, and a transistor for turning ON / OFF the pixel is formed at each intersection, and an organic EL element and a current supply for supplying a light emitting current of the organic EL element are formed thereon. Connect the wires.

FIG. 2 is a sectional view showing the structure of the organic EL device. In this organic EL device, a transparent electrode 32, an organic hole transport layer 33, a light emitting layer 34, and a metal electrode 35 are formed on a glass substrate 31 in a laminated manner. When a DC current is applied with the transparent electrode 32 on the positive electrode side and the metal electrode 35 on the negative electrode side as shown in the figure, holes are injected from the transparent electrode 32 into the light emitting layer 34 via the hole transport layer 33, and the metal electrode 31 Then, electrons are injected into the light emitting layer 34. In the light emitting layer 34, the recombination of holes and electrons occurs, and the excitons generated by the recombination emit light when they transition from the excited state to the ground state. At this time, the current flowing through the organic EL element is proportional to the amount of light emission.

In the organic EL display device, when performing white display of a certain pixel, a signal is input to a data line and an address line, and a transistor corresponding to each of R, G, and B pixels to emit light is turned on, and the transistor is turned on. To supply a current from the current supply line to the organic EL element, thereby causing the organic EL element to emit light. When this pixel is to be displayed in black, a signal is input to the data line and the address line, the transistor corresponding to the black pixel is turned off, and the supply of current from the current supply line to the organic EL element is cut by turning off the transistor. The light emission of the organic EL element is stopped.

As described above, in the organic EL display device, a pixel for performing white display consumes a large current for lighting, and a pixel for performing black display consumes only a small current for turning off a minute transistor. .

The portable electronic device of the present invention has processing means for correcting the character color to white and correcting the background based on white to black based on the character display screen. FIG. 3 shows a display screen 31 of an information service in which the correction processing of this embodiment is performed on information for displaying the screen of the conventional example of FIG. In the correction processing of the present embodiment, the background 32 is displayed in black and the characters 33 are displayed in white, and no correction processing is applied to the image information 34. In the organic EL display device, since current is not consumed in pixels performing black display, the amount of current consumption is very small in this example in which most pixels on the screen perform black display.

The character 33 which has been subjected to the above-described correction processing does not lower the contrast because only the color is changed, so that the display quality hardly deteriorates. Further, since the image information 34 is not subjected to this correction, the display quality does not deteriorate at all.

Next, FIG. 3 shows a processing flow from reception of a radio signal of an information service to display of a screen in the mobile radio telephone device according to the present embodiment. First, the display mode is set by the user via the operation keys 21 as in step S1.

As shown in FIG. 4, mode 1 is a mode in which display data is displayed on the display screen of the EL display device 22 without correcting characters and images. Mode 2 is a mode for correcting the brightness of a character and its background as shown in FIG. 3 when displaying an operation screen for selecting the device state or function of the mobile radio telephone device. Mode 3 is a mode for correcting the brightness of the character and its background on both the information service screen for contents and the like received by wireless communication and the operation screen. Mode 4 is a mode for correcting the brightness of characters and their background on the operation screen when the remaining amount of the rechargeable battery becomes low. Mode 5 is a mode in which, when the remaining amount of the rechargeable battery becomes low, the brightness of the character and its background is corrected for both the information service screen received by wireless communication and the operation screen. Operation keys 21
The display mode set via is stored in the mode storage unit 17a of the storage unit 17 (see FIG. 1).

When the display mode is set, the control unit 18 displays the operation screen on the organic EL display according to the set display mode (step S2). That is, if the mode 2 or 3 is set or the mode 4 or 5 is set and the remaining amount of the rechargeable battery is low, the control unit 18 changes the character color to white and the character background to Correct the screen to black and display the operation screen. The remaining amount of the rechargeable battery is determined by inputting the remaining amount information from the rechargeable battery remaining amount detection unit 20. When the mode 1 is set or the mode 4 or 5 is set and the remaining amount of the rechargeable battery is sufficient, the control unit 18 displays the operation screen without correcting the display information. I do.

When a radio signal is transmitted from the base station as in step S3, the antenna unit 11 and the RF unit 12 receive and demodulate the radio signal. The demodulated signal is separated into an audio signal and a control signal by the baseband unit 13, and display information for displaying a screen is extracted from the control signal and stored in the storage unit (steps SS4 and S5).

Next, the control unit 18 checks the display mode set in step S1 with reference to the display mode storage unit 17a, and determines whether or not the screen needs to be corrected (step S1).
6, S7). In this example, since the information service screen such as the content received via the wireless communication is displayed, the display mode 3 is set or the display mode 5 is set and the remaining amount of the rechargeable battery is small. In this case, the control unit 18 determines that the screen correction processing is necessary. Control unit 18
Based on the display information stored in the storage unit 17, the color of the character is corrected to white and the background of the character is corrected to black as shown in FIG. 3, and a bitmap is generated without changing the color of the image information. The bitmap is stored again in the storage unit 17 (step S
8, S9, S11, S12).

In step S5, whether display mode 1, 2 or 4 has been set, or if display mode 5
Is set and the remaining amount of the rechargeable battery is sufficient, the control unit 18 determines that it is not necessary to correct the screen (step S7). In this case, the control unit 18 generates a bitmap without performing color correction on the character, its background, and image information, and stores the bitmap in the storage unit 17 again (steps S10 to S12). Next, the control unit 18 takes out the stored bitmap and displays it on the organic EL display device 21.

The display information for displaying the screen here is usually C-HTML or HD which is a simplified HTML format.
This shows data in ML format. In this format, characters and their background composed of decorative information and text called tags, and G
It is composed of image information such as IF and BMP format.

A first feature of the present invention resides in that, when a process of displaying a character and image information on a screen is performed, a correction process is performed on the color information of the character 33 and its background 32 as shown in FIG.
The color information is a color pallet having 1 to 6 bit colors. In the present embodiment, the background color is converted to black and the characters are converted to white. However, only the black characters may be converted to white, and the other color characters may be displayed in the same color as the original screen. Also, if the luminance difference or contrast between the character and its background on the original screen (original display information) is equal to or greater than the luminance difference between the corrected character and its background and the corrected background luminance is lower than the luminance of the character. Any color can be used as the color of the corrected character and its background.

A second feature of the present invention is that different correction processing is performed on the color information of the character 33 and the image information 34 as shown in FIG. If you apply the same corrections to text as image information,
The expression quality of image information is reduced, and power consumption is not reduced.

A third feature of the present invention is that it is different from the correction for simply inverting the luminance gradation. Even if a correction for simply inverting the luminance gradation is applied, in the case of a display screen that originally consumes a small amount of current, a problem arises that the current consumption increases.

As in the present embodiment, the background color is set to black and the character color is changed to the display screen for operation for selecting the state and function of the mobile radio telephone device and the display screen of the information service received via radio. If you set the mode to display in white,
Even when the screen is switched from the information service display screen to the operation display screen, the display affinity for the user is maintained.

Further, unlike the correction processing for the display screen of the information service, the correction of the display screen for the operation of selecting the state or function of the mobile radio telephone apparatus is performed by the R in the mobile radio telephone apparatus.
Since the color information is stored in the OM or the RAM, a color pallet corresponding to the mode switching is prepared and used, so that even when the mode is switched, it is possible to use the device without discomfort.

FIG. 6 shows the effect of reducing power consumption in this embodiment in more detail. FIG. 6 is a plot of the ratio of the display dots to the entire screen dots as the display dot occupancy, and the power consumption relative to the display dot occupancy as a solid line 41 (when the white display brightness is set to 100 cd / m ² and used. ). As shown by the solid line 41, the larger the number of display dots, the higher the power consumption.

As a result of the investigation, a general display dot occupation of information for displaying the information service of the mobile radio telephone device using the organic EL display device of the conventional example and the operation screen for selecting the state and function of the device is shown. The rate was found to be 65-80%.

Therefore, in the prior art, the region 43 surrounded by oblique lines
As shown by, the display dot occupancy becomes 65 to 80%,
The average power consumption is about 160 mW. On the other hand, when the present invention is applied, the occupation ratio of the display dots can be set to 20 to 35%, the average power consumption is about 80 mW, and the 50% It became possible to reduce power consumption soon.

The power consumption of the organic EL display device is about 20% of the total power consumption of the mobile radiotelephone device. As a result, the power consumption of the mobile radiotelephone device is reduced by about 10% as a whole. It could be extended by nearly 10% in terms of time.

In the present embodiment, there is only one type of information correction processing for displaying an operation screen for selecting the state of an information service or an apparatus or a function, but other color combinations for reducing power consumption. For example, the background color may be green with high luminous efficiency, the character color may be red with low luminous efficiency, the background color may be black, and the character color may be a single color with high luminous efficiency. In the case where both the background color and the character color can reduce power consumption more than the original display information, an intermediate color may be used. Also, a plurality of correction processes may be provided,
A function of calculating and determining the number of illuminated pixels and the luminance level from information for displaying a screen and selecting a correction process may be provided.

Also, an example has been described in which these correction processes are started when the remaining amount of the rechargeable battery is low. However, the correction processes may be performed only in the reception standby state.

Although the present embodiment has been described as a correction process performed on characters, the screen of information indicating the state of the apparatus is often displayed as an icon, and the same correction process is performed on this icon as on a character. May be performed.

The above process may be used in combination with the process of adjusting the maximum luminance level of the light emitting unit according to the use environment illuminance to reduce the power consumption.

[0044]

According to the present invention, in a mobile terminal using an organic EL as a display device, an image is normally displayed, a background is displayed in black, and characters are displayed in white with correction. Thus, it is possible to realize a mobile radio telephone device capable of reducing power consumption and extending the use time of a rechargeable battery while maintaining the legibility of display without modifying hardware.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile radio telephone device according to the present invention.

FIG. 2 is a diagram illustrating a configuration of an organic EL element.

FIG. 3 is an example of a display screen to which the present invention is applied.

FIG. 4 is a table for explaining a display mode of the present invention.

FIG. 5 is a diagram showing a processing flow from reception of a wireless signal to display of a screen according to the present invention.

FIG. 6 is a diagram illustrating an effect of reducing power consumption according to the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional mobile radio telephone device.

FIG. 8 is a diagram showing a processing flow from reception of a wireless signal to display of a screen in the related art.

FIG. 9 is an example of a conventional display screen.

[Explanation of symbols]

11: Antenna unit, 12: RF unit, 13: Baseband unit, 14: Audio unit, 15: Speaker, 16: Microphone, 18: Control unit, 17: Storage unit, 19: Rechargeable battery remaining amount detection unit, 20: Operation keys / organic EL display device driver, 2
DESCRIPTION OF SYMBOLS 1 ... Operation key, 22 ... Organic EL display device, 31 ... Glass substrate, 32 ... Transparent electrode, 33 ... Hole transport layer, 34 ... Light emitting layer, 35 ... Metal electrode.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H04M 1/73 H05B 33/08 H05B 33/08 33/14 A 33/14 H04B 7/26 109T F term ( Reference) 3K007 AB05 BA06 CA01 CB01 EB00 GA04 5K023 AA07 BB04 HH01 HH07 MM01 5K027 AA11 BB17 FF01 FF22 GG04 HH30 MM17 5K067 AA34 BB04 BB21 DD51 EE02 FF02 FF23

Claims (5)

[Claims] 1. A self-luminous display device, processing means for processing display information including at least a character and a background of the character, and display control means for displaying the display information provided by the processing means on the display device Wherein the processing means has correction means for correcting the luminance of the character and the background of the character in the display information so that the average luminance of the background is smaller than the average luminance of the character. And portable electronic devices. 2. The information processing apparatus according to claim 1, further comprising a detecting unit configured to detect a remaining amount of power of the rechargeable battery, wherein when the processing unit determines that the remaining amount is small using the detecting unit, the correcting unit sets the display information. 2. The portable electronic device according to claim 1, wherein the correction is made. 3. A mode setting device for setting the portable electronic device to one of a mode for performing correction by the correction device and a mode for not performing correction by the correction device. The portable electronic device according to claim 1. 4. A mobile radiotelephone device having a self-luminous display device for displaying at least characters, a first display mode that does not limit a relative relationship between an average luminance of characters and an average luminance of a background, and an average of characters. The contrast value of the luminance and the average luminance of the background is equal to or greater than the contrast value of the average luminance of the characters and the average luminance of the background in the first display mode, and the average luminance of the background is smaller than the average luminance of the characters. A mobile radio telephone device comprising at least two display modes, a second display mode for correcting and displaying the same display data as the first display mode. 5. A means for receiving a wireless signal; a means for generating at least a character and an image from the received wireless signal; a correcting means for performing different display correction on the character and the image; A mobile radiotelephone device comprising: a self-luminous display means for displaying the character and the image.