JP2006254304A - Portable terminal device - Google Patents

Portable terminal device Download PDF

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JP2006254304A
JP2006254304A JP2005070969A JP2005070969A JP2006254304A JP 2006254304 A JP2006254304 A JP 2006254304A JP 2005070969 A JP2005070969 A JP 2005070969A JP 2005070969 A JP2005070969 A JP 2005070969A JP 2006254304 A JP2006254304 A JP 2006254304A
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temperature
terminal device
detection means
current
information display
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Kenji Senoo
賢治 妹尾
Naoto Sugawara
直人 菅原
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To cause a current that does not exceed maximum rating at a high temperature and obtains a sufficient display property at an ordinary temperature, to flow to an illuminator by controlling the current capable of flowing to the illuminator in accordance with an ambient temperature of a portable terminal device. <P>SOLUTION: The terminal device includes an illuminator for illuminating an information display screen 5 of the device or the information display screen and an operation input part; a light quantity detection means 1 for detecting the quantity of light around the terminal device; a temperature detection means 3 for detecting the ambient temperature of the terminal device; and dimming control means 7, 8 for adjusting the luminance of the information display screen by controlling a driving current of the illuminator based on information regarding the quantity of light detected by the light quantity detection means and information regarding the temperature detected by the temperature detection means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、たとえば、携帯電話機のような情報表示部を備えた携帯端末装置において、特に、情報表示部を照明するための照明装置による照明輝度を、周囲環境に合わせて最適な状態に制御できるようにした携帯端末装置に関するものである。   The present invention can control, for example, the illumination brightness of an illumination device for illuminating the information display unit to an optimum state in accordance with the surrounding environment in a portable terminal device including an information display unit such as a cellular phone. The present invention relates to the mobile terminal device.

周囲の状況に応じて、バックライトやキー照明装置などの照明装置を適切なタイミングで自動的に点灯および消灯させるようにした従来の携帯端末装置としては、例えば、特開２００２−１７１３４０号公報（以下、特許文献１という。）がある。
この従来の携帯端末装置の調光機能は、情報表示装置の表示面を照明するための照明装置と、装置本体の周辺の明るさを検出することが可能な位置に配備された光検出手段と、この光検出手段の出力信号に基づいて、照明装置の点灯および消灯を制御する照明制御手段を具える構成とされている。 As a conventional portable terminal device in which lighting devices such as a backlight and a key lighting device are automatically turned on and off at an appropriate timing according to the surrounding situation, for example, Japanese Patent Laid-Open No. 2002-171340 ( Hereinafter, it is referred to as Patent Document 1.
The dimming function of this conventional portable terminal device includes an illuminating device for illuminating the display surface of the information display device, and a light detecting means arranged at a position capable of detecting the brightness around the device main body. The illumination control unit is configured to control lighting and extinguishing of the lighting device based on the output signal of the light detection unit.

特開２００２−１７１３４０号公報JP 2002-171340 A

このような従来の携帯端末装置が備える調光機能では、温度に関する制御が含まれない構成であるため、バックライト等の照明装置の最大定格を守るためには、照明装置に流す最大電流を、高温での値に設定する必要があった。
従って、更に電流を流すことのできる常温時でも、高温時での低い設定値に制限され、照明装置に必ずしも十分な電流を供給することができず、結果的に、照明は暗く十分な表示特性が得られないという問題点があった。 In the dimming function provided in such a conventional portable terminal device, because it is a configuration that does not include control related to temperature, in order to protect the maximum rating of a lighting device such as a backlight, the maximum current that flows to the lighting device, It was necessary to set the value at a high temperature.
Therefore, even at room temperature at which further current can flow, the setting value is limited to a low value at high temperature, and sufficient current cannot be supplied to the lighting device. As a result, illumination is dark and has sufficient display characteristics. There was a problem that could not be obtained.

この発明は上記のような従来の問題点を解消するためになされたもので、携帯端末装置の周囲温度によって照明装置に流せる電流を調整し、高温では最大定格を超えず、常温では十分な表示特性が得られるだけの電流を照明装置に流すことのできる調光機能を備えた携帯端末装置を得ることを目的とする。   The present invention was made to solve the above-described conventional problems, and the current that can be passed to the lighting device is adjusted according to the ambient temperature of the portable terminal device, so that the maximum rating is not exceeded at high temperatures and sufficient display at normal temperatures. An object of the present invention is to obtain a portable terminal device having a dimming function capable of flowing a current sufficient to obtain characteristics to the lighting device.

この発明に係る携帯端末装置は、携帯端末装置の情報表示部、または、情報表示部と操作入力部とを照明するための照明装置、前記端末装置の周辺の光量を検出する光量検出手段、前記端末装置の周囲温度を検出する温度検出手段、前記光量検出手段によって検出された光量情報と、前記温度検出手段によって検出された温度情報とに基づいて、前記照明装置に供給される駆動電流を制御し照明装置の照明輝度を調節する調光制御手段を備えたものである。   A portable terminal device according to the present invention includes an information display unit of a portable terminal device, an illumination device for illuminating the information display unit and the operation input unit, a light amount detection unit that detects a light amount around the terminal device, Temperature detection means for detecting the ambient temperature of the terminal device, control of the drive current supplied to the illumination device based on the light quantity information detected by the light quantity detection means and the temperature information detected by the temperature detection means And a dimming control means for adjusting the illumination brightness of the illumination device.

この発明によれば、調光制御手段が温度検出手段の出力を参照して照明装置の駆動電流を制御するように構成したので、周囲温度に対して最適の照明装置動作条件を設定することが可能となり、携帯端末装置の情報表示特性が向上する。   According to the present invention, the dimming control means is configured to control the driving current of the lighting device with reference to the output of the temperature detection means, so that the optimum lighting device operating condition can be set for the ambient temperature. It becomes possible, and the information display characteristic of a portable terminal device improves.

実施の形態１．
この発明の実施の形態１について、図１、図２を参照しながら説明する。
図１は、この発明の実施の形態１の主要な構成を示す制御ブロック図、図２は、周辺光量とバックライト電流との関係の一例を示す図である。
図１において、１は、周囲の光量を検出する光センサー、２は、光センサー１の出力を受け取る光検出部、３は、周囲温度を検出する温度センサーで、この場合は、ある一定の温度閾値を持ち、その温度より周囲温度が上か下かの２値を出力するものである。
４は、温度センサー３の出力を受け取る温度検出部である。５は、携帯端末装置において情報を表示する表示装置、６は、表示装置５を照明するためのバックライト（図示せず。）に電流を供給するＬＥＤコントローラ、７は、ＬＥＤコントローラ６を制御する照明制御部、８は、光検出部２および温度検出部３の情報を元に照明制御部７の動作を決定する調光制御回路部である。なお、この調光制御回路部８には、図２に示すように、予め、周辺光量に対する最適なバックライト電流の大きさを、常温時と高温時の２種類について設定したプロファイルが内蔵されている。 Embodiment 1 FIG.
Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a control block diagram showing the main configuration of Embodiment 1 of the present invention, and FIG. 2 is a diagram showing an example of the relationship between the peripheral light amount and the backlight current.
In FIG. 1, 1 is an optical sensor that detects the amount of ambient light, 2 is a light detection unit that receives the output of the optical sensor 1, and 3 is a temperature sensor that detects the ambient temperature. In this case, a certain temperature is detected. It has a threshold value and outputs a binary value that indicates whether the ambient temperature is above or below that temperature.
Reference numeral 4 denotes a temperature detection unit that receives the output of the temperature sensor 3. 5 is a display device for displaying information in the portable terminal device, 6 is an LED controller for supplying current to a backlight (not shown) for illuminating the display device 5, and 7 is for controlling the LED controller 6. The illumination control unit 8 is a dimming control circuit unit that determines the operation of the illumination control unit 7 based on information from the light detection unit 2 and the temperature detection unit 3. As shown in FIG. 2, the dimming control circuit unit 8 has a built-in profile in which the optimum backlight current with respect to the peripheral light quantity is set in two types at normal temperature and high temperature. Yes.

次に、実施の形態１の動作について説明する。
温度センサー３による検出温度が常温時のものである場合には、光センサー１で周辺光量を検出した調光制御回路部８は、あらかじめ内蔵している常温時の、周辺光量に応じたバックライト電流値のプロファイルに従って、ＬＥＤコントローラ６に指示を出す。
その結果、表示装置５は、周辺光量に応じた輝度により、最適な表示特性を保つことができる。 Next, the operation of the first embodiment will be described.
When the temperature detected by the temperature sensor 3 is at room temperature, the dimming control circuit unit 8 that detects the peripheral light amount by the optical sensor 1 has a built-in backlight according to the peripheral light amount at normal temperature. The LED controller 6 is instructed according to the current value profile.
As a result, the display device 5 can maintain optimum display characteristics with the luminance according to the peripheral light amount.

また、温度センサー３が持つある閾値以上の温度になった場合、すなわち、高温時には、常温条件でのバックライト電流をそのまま流すと最大定格を超えてしまう可能性があるので、調光制御回路部８がそれを検出し、内蔵されているもう一つの高温時のプロファイルに従ってＬＥＤコントローラ６に指示を出す。こうすることで、表示装置５の最大定格を超えないように照明制御が可能になる。   In addition, when the temperature of the temperature sensor 3 exceeds a certain threshold, that is, at a high temperature, if the backlight current under normal temperature conditions is passed as it is, the maximum rating may be exceeded. 8 detects it and issues an instruction to the LED controller 6 according to another built-in high temperature profile. By doing so, it is possible to control the lighting so that the maximum rating of the display device 5 is not exceeded.

以上のように、この発明の実施の形態１によれば、温度検出手段は、周囲温度によって２値の出力を持つ温度センサー３を有し、調光制御手段は、周辺光量に対する照明装置の最適な駆動電流の大きさを、予め、常温時と高温時の２種類について設定した第一のプロファイルと第二のプロファイルを内蔵しており、前記温度センサーの出力に応じて、前記調光制御手段が第一のプロファイルまたは第二のプロファイルを用いて照明装置の駆動電流を制御するように構成したので、周囲温度に対して最適の照明装置動作条件を設定することが可能となり、携帯端末装置の情報表示特性が向上する効果がある。   As described above, according to the first embodiment of the present invention, the temperature detection means has the temperature sensor 3 having a binary output depending on the ambient temperature, and the dimming control means is the optimum of the lighting device for the ambient light amount. A first profile and a second profile in which the magnitudes of various driving currents are set in advance for two types at normal temperature and high temperature, and the dimming control means is provided according to the output of the temperature sensor. Is configured to control the driving current of the lighting device using the first profile or the second profile, so that it is possible to set the optimal lighting device operating condition with respect to the ambient temperature, and This has the effect of improving the information display characteristics.

実施の形態２．
図３は、この発明の実施の形態２の主要な構成を示す制御ブロック図、図４は、周辺光量とバックライト電流との関係、および周囲温度とピーク時バックライト電流の関係を示す図である。
図３において、上記実施の形態１の図１と異なるところは、温度センサー３に代えて、周囲温度の変化に従って連続的な値を出力するサーミスタ等の温度検出器９を用いた点である。その他の構成は図１と同等であり、説明は省略する。 Embodiment 2. FIG.
FIG. 3 is a control block diagram showing the main configuration of Embodiment 2 of the present invention, and FIG. 4 is a diagram showing the relationship between the peripheral light amount and the backlight current, and the relationship between the ambient temperature and the peak backlight current. is there.
3 differs from FIG. 1 of the first embodiment in that a temperature detector 9 such as a thermistor that outputs a continuous value according to a change in ambient temperature is used instead of the temperature sensor 3. Other configurations are the same as those in FIG.

この実施の形態２においては、図４のように、調光制御回路部８に内蔵するプロファイルの構成を、温度によるピーク時バックライト電流の調整と、周辺光量によってピーク時バックライト電流の何％流すかの調整の２つにする。
このようにすることで、周辺光量と周囲温度の変化に対して連続的に最適な表示特性が得られる照明制御が可能となる。 In the second embodiment, as shown in FIG. 4, the profile of the profile incorporated in the dimming control circuit unit 8 is adjusted by adjusting the peak backlight current depending on the temperature, and what percentage of the peak backlight current depends on the amount of peripheral light. Two adjustments of whether to flow.
By doing so, it is possible to perform illumination control in which optimum display characteristics are continuously obtained with respect to changes in the ambient light amount and the ambient temperature.

実施の形態３．
図５はこの発明の実施の形態３の主要な構成を示す制御ブロック図である。なお、図１との同一符号は、同一または相当部分を示す。
上述の実施の形態１、２においては、携帯端末装置の情報を表示する表示装置の照明制御について説明したが、図５のように、表示装置５だけでなく、操作入力部（操作キー）のキーバックライト１０の輝度の照明制御を同時に実施することも可能である。 Embodiment 3 FIG.
FIG. 5 is a control block diagram showing the main configuration of Embodiment 3 of the present invention. 1 denote the same or corresponding parts.
In the above-described first and second embodiments, the lighting control of the display device that displays the information of the mobile terminal device has been described. However, not only the display device 5 but also the operation input unit (operation key) as illustrated in FIG. It is also possible to perform illumination control of the brightness of the key backlight 10 at the same time.

この発明の実施の形態１による携帯端末装置の主要な構成を示す制御ブロック図である。It is a control block diagram which shows the main structures of the portable terminal device by Embodiment 1 of this invention. この発明の実施の形態１における周辺光量とバックライト電流との関係を示す図である。It is a figure which shows the relationship between the peripheral light quantity and backlight electric current in Embodiment 1 of this invention. この発明の実施の形態２の主要な構成を示す制御ブロック図である。It is a control block diagram which shows the main structures of Embodiment 2 of this invention. この発明の実施の形態２における周辺光量とバックライト電流の関係、および周囲温度とピーク時バックライト電流の関係を示す図である。It is a figure which shows the relationship between the amount of ambient light and backlight current in Embodiment 2 of this invention, and the relationship between ambient temperature and a peak time backlight current. この発明の実施の形態３の主要な構成を示す制御ブロック図である。It is a control block diagram which shows the main structures of Embodiment 3 of this invention.

符号の説明Explanation of symbols

１ 光センサー ２ 光検出部 ３ 温度センサー
４ 温度検出部 ５ 表示装置 ６ ＬＥＤコントローラ
７ 照明制御部 ８ 調光制御回路部 ９ 温度検出器
１０ キーバックライト DESCRIPTION OF SYMBOLS 1 Light sensor 2 Light detection part 3 Temperature sensor 4 Temperature detection part 5 Display apparatus 6 LED controller 7 Illumination control part 8 Dimming control circuit part 9 Temperature detector 10 Key backlight

Claims (3)

携帯端末装置の情報表示部、または、情報表示部と操作入力部とを照明するための照明装置、前記端末装置の周辺の光量を検出する光量検出手段、前記端末装置の周囲温度を検出する温度検出手段、前記光量検出手段によって検出された光量情報と、前記温度検出手段によって検出された温度情報とに基づいて、前記照明装置の駆動電流を制御し前記情報表示部の輝度を調節する調光制御手段を備えた携帯端末装置。   Illumination device for illuminating the information display unit of the portable terminal device or the information display unit and the operation input unit, light amount detection means for detecting the amount of light around the terminal device, temperature for detecting the ambient temperature of the terminal device Based on the light quantity information detected by the detection means and the light quantity detection means and the temperature information detected by the temperature detection means, the dimming that controls the drive current of the illumination device and adjusts the luminance of the information display unit A mobile terminal device provided with a control means. 前記温度検出手段は、周囲温度によって２値の出力を持つ温度センサーを有し、前記調光制御手段は、周辺光量に対する照明装置の最適な駆動電流の大きさを、予め、常温時と高温時の２種類について設定した第一のプロファイルと第二のプロファイルを内蔵しており、前記温度センサーの出力に応じて、前記調光制御手段が第一のプロファイルまたは第二のプロファイルを用いて前記照明装置の駆動電流を制御するようにしたことを特徴とする請求項１に記載の携帯端末装置。   The temperature detection means has a temperature sensor having a binary output depending on the ambient temperature, and the dimming control means determines the optimum drive current magnitude of the illumination device with respect to the ambient light amount at room temperature and high temperature in advance. The first profile and the second profile set for the two types are incorporated, and the dimming control means uses the first profile or the second profile according to the output of the temperature sensor to 2. The portable terminal device according to claim 1, wherein a drive current of the device is controlled. 前記温度検出手段は、周囲温度の変化に従って連続的な値を出力する温度検出器を備え、前記調光制御手段は、照明装置の駆動電流の、温度に対応した最大電流の調整と、周辺光量の変化に対応した電流値の調整を連続的に行なうよう構成したことを特徴とする請求項１に記載の携帯端末装置。   The temperature detection unit includes a temperature detector that outputs a continuous value according to a change in ambient temperature, and the dimming control unit adjusts the maximum current corresponding to the temperature of the driving current of the lighting device, and the ambient light amount. 2. The mobile terminal device according to claim 1, wherein the current value corresponding to the change in the current value is continuously adjusted.
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