TWI447697B - Hysteresis-type controlling method for backlight of portable electronic device - Google Patents
Hysteresis-type controlling method for backlight of portable electronic device Download PDFInfo
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本發明係有關於一種可攜式電子裝置背光調整方法，特別是有關於一種可攜式電子裝置之遲滯式背光調整方法。The present invention relates to a backlight adjustment method for a portable electronic device, and more particularly to a hysteresis backlight adjustment method for a portable electronic device.
隨著科技的進步，越來越多可攜式電子裝置如行動電話、個人數位助理(PDA)的功能日益強大，也漸漸普及為消費者所使用。再者，隨著中小尺寸液晶面板製程進步及價格下降，使用者觀看可攜式電子裝置液晶面板的機率及需求也日益提升。With the advancement of technology, more and more portable electronic devices such as mobile phones and personal digital assistants (PDAs) are becoming more and more powerful, and are gradually becoming popular for consumers. Furthermore, as the process of small and medium-sized LCD panels progresses and the price decreases, the probability and demand for users to view the LCD panel of the portable electronic device is also increasing.
在有關於可攜式電子裝置液晶面板(LCD)的顯示畫質部份，由於使用者可能常於行動中使用可攜式電子裝置，因此首先要改善隨著不同環境光線，自動調整螢幕光源，以達到節能且閱讀舒適的功能。如果外部光源太亮的時候，背光開啟只是浪費電源，所以自動關閉，讓LCD自行反射光源，然而當環境光線太暗時，顯示裝置所呈現的畫面相對環境光線而常較亮，如此強烈的光線將造成使用者眼部的不適。In the display picture quality part of the portable electronic device liquid crystal panel (LCD), since the user may often use the portable electronic device in the action, the first thing is to improve the screen light source automatically according to different ambient light. To achieve energy saving and comfortable reading. If the external light source is too bright, the backlight is only a waste of power, so it automatically turns off, let the LCD reflect the light source by itself. However, when the ambient light is too dark, the display device is often brighter than the ambient light, so strong light will Causes discomfort to the user's eyes.
一般而言，LCD可透射(transmissive)顯示也可反射(reflective)顯示，取決於光源位置。透射型LCD由一個螢幕背後的光源照亮，而觀看則在螢幕另一邊(前面)。這種類型的LCD多用在需高亮度顯示的應用中，例如電腦顯示器。反射型LCD，常見於電子鐘錶和PDA，且由後面的反射面將外部的光反射回來照亮螢幕。半穿透反射式(transreflective)LCD既可以當作透射型使用，也可當作反射型使用。當外部光線很足的時候，該LCD按照反射型工作，而當外部光線不足的時候，它又能當作透射型使用。In general, the LCD can be transmissive and reflective, depending on the location of the source. The transmissive LCD is illuminated by a light source behind the screen, while viewing is on the other side of the screen (front). This type of LCD is often used in applications that require high brightness, such as computer monitors. Reflective LCDs, commonly found in electronic timepieces and PDAs, reflect the external light back from the rear reflecting surface to illuminate the screen. A transreflective LCD can be used both as a transmissive type and as a reflective type. When the external light is sufficient, the LCD works as a reflection type, and when the external light is insufficient, it can be used as a transmissive type.
基於上述缺失，一種具有亮度調整裝置之顯示器應運而生，亮度調整裝置可包含一光源感測單元及一背光調整單元。參見第一圖，為該亮度調整裝置之背光亮度調整曲線，且假設該顯示器為半穿透反射式LCD，該光源感測單元所感測環境光亮度可分成三個區域，分別為由臨界值C1及C2所界定之弱光區域、正常區域及強光區域。背光調整單元及依據環境光所處於之區域，而調整背光大小。然而在上述的亮度調整裝置中，若使用者(例如使用PDA收路邊停車費的人員)處於移動狀態，則環境光亮度可能會在臨界值C1及C2附近跳動，造成背光急遽變化。這樣會造成使用者視覺疲憊，且使背光調整單元工作過度頻繁。Based on the above-mentioned deficiencies, a display having a brightness adjusting device may be developed, and the brightness adjusting device may include a light source sensing unit and a backlight adjusting unit. Referring to the first figure, the backlight brightness adjustment curve of the brightness adjusting device is assumed, and the display is a transflective LCD, and the ambient light brightness sensed by the light source sensing unit can be divided into three regions, respectively, by a critical value C1. And the weak light area, normal area and strong light area defined by C2. The backlight adjustment unit adjusts the backlight size according to the area in which the ambient light is located. However, in the above-described brightness adjusting device, if the user (for example, a person who uses the PDA to collect the parking fee) is in a moving state, the ambient light brightness may jump near the critical values C1 and C2, causing the backlight to change rapidly. This can cause the user to be visually exhausted and make the backlight adjustment unit work too frequently.
因此本發明之目的即在提供一種以遲滯方式(hysteresis)調整背光之方法，以避免在可攜式電子裝置上之背光變化的跳動問題。It is therefore an object of the present invention to provide a method of adjusting backlights in hysteresis to avoid bounce problems in backlight variations on portable electronic devices.
為了達成上述目的，本發明提供一種可攜式電子裝置之遲滯式背光調整方法，在預設該可攜式電子裝置操作於一預設模式及感測一環境光亮度後，當環境光亮度大於一第一臨界值(例如2000流明)時，設定該可攜式電子裝置操作於一日光模式。在日光模式時，若環境光亮度小於一第二臨界值時(例如1000流明)，設定該可攜式電子裝置操作於該預設模式。該第一臨界值係明顯大於第二臨界值，因此在背景光線充足時，可以關閉背光而節省電力。再者，遲滯式背光調整方法可防止背光在一般模式及日光模式間急速變換，以避免使用者觀看不適。In order to achieve the above object, the present invention provides a hysteresis backlight adjustment method for a portable electronic device. After the portable electronic device is preset to operate in a preset mode and sense an ambient light brightness, the ambient light brightness is greater than A first threshold (eg, 2000 lumens) is set to operate the portable electronic device in a daylight mode. In the daylight mode, if the ambient light brightness is less than a second threshold (eg, 1000 lumens), the portable electronic device is set to operate in the preset mode. The first critical value is significantly greater than the second critical value, so that when the background light is sufficient, the backlight can be turned off to save power. Furthermore, the hysteresis backlight adjustment method prevents the backlight from rapidly changing between the normal mode and the daylight mode to prevent the user from viewing discomfort.
再者，在預設模式時，若環境光亮度小於一第三臨界值(如100流明)時，設定該可攜式電子裝置操作於一夜間模式；及在夜間模式時，若環境光亮度大於一第四臨界值(150流明)時，設定該可攜式電子裝置操作於該預設模式。遲滯式背光調整方法可防止背光在一般模式及夜間模式間急速變換，以避免使用者觀看不適。Furthermore, in the preset mode, if the ambient light brightness is less than a third threshold (eg, 100 lumens), the portable electronic device is set to operate in a night mode; and in the night mode, if the ambient light brightness is greater than And a fourth threshold (150 lumens), the portable electronic device is set to operate in the preset mode. The hysteresis backlight adjustment method prevents the backlight from rapidly changing between the normal mode and the night mode to prevent the user from viewing discomfort.
請參見第二圖，為依據本發明方法操作之一可攜式電子裝置，該可攜式電子裝置包含一控制器100、一光感測器102、一類比數位轉換器104、一液晶顯示器(LCD)背光驅動器110、一按鍵背光單元112、及一LCD 120。Referring to the second figure, a portable electronic device is operated according to the method of the present invention. The portable electronic device includes a controller 100, a light sensor 102, an analog digital converter 104, and a liquid crystal display ( The LCD) backlight driver 110, a button backlight unit 112, and an LCD 120.
該光感測器102感測一背景光亮度，且將該背景光亮度送至該類比數位轉換器104。該類比數位轉換器104將該背景光亮度轉換成一背景光亮度數位值，然後送至控制器100處理。該控制器100分別電連接至該LCD背光驅動器110及按鍵背光單元112，以依據本發明之方法(詳見後述)及該背景光亮度數位值，分別驅動該LCD背光驅動器110及按鍵背光單元112，進而控制LCD背光及按鍵背光。The photo sensor 102 senses a background light brightness and sends the background light brightness to the analog to digital converter 104. The analog digital converter 104 converts the backlight brightness into a background light luminance digital value and sends it to the controller 100 for processing. The controller 100 is electrically connected to the LCD backlight driver 110 and the key backlight unit 112, respectively, for driving the LCD backlight driver 110 and the key backlight unit 112 according to the method of the present invention (described later in detail) and the background light luminance digital value. To control the LCD backlight and button backlight.
該LCD可為一半穿透反射式LCD(transreflective)，例如卡西歐之Blanview LCD，但是本發明方法適用範圍不在此限。The LCD may be a transreflective LCD, such as the Casio Blanview LCD, but the scope of application of the method of the present invention is not limited thereto.
參見第三圖，為依據本發明之可攜式電子裝置之遲滯式背光調整方法狀態圖(state diagram)。本發明之可攜式電子裝置預設操作模式為一般模式(S100)，且當背景光亮度大於一第一臨界值LUX1時，該控制器100會將該可攜式電子裝置設定在日光模式(S110)，其中在日光模式下，該控制器100控制該LCD背光驅動器110為最小亮度，及控制該按鍵背光單元112為最小亮度，例如該最小亮度可以為零。Referring to the third figure, a state diagram of a hysteresis backlight adjustment method for a portable electronic device according to the present invention. The preset operating mode of the portable electronic device of the present invention is a normal mode (S100), and when the brightness of the background light is greater than a first threshold LUX1, the controller 100 sets the portable electronic device in a daylight mode ( S110), wherein in the daylight mode, the controller 100 controls the LCD backlight driver 110 to be the minimum brightness, and controls the button backlight unit 112 to be the minimum brightness, for example, the minimum brightness may be zero.
在日光模式(S110)下，當背景光亮度小於一第二臨界值LUX2時，該控制器100會將該可攜式電子裝置設定返回一般模式(S100)，且在一般模式時，該控制器100控制該LCD背光驅動器110為使用者預設亮度，及控制該按鍵背光單元112為使用者預設亮度，例如該使用者預設亮度可以為最大(100%)亮度。前述之第二臨界值LUX2明顯小於第一臨界值LUX1，例如第一臨界值LUX1為2000流明(如在日光下)，而第二臨界值LUX2為1000流明。因此在背景光線充足時，可以關閉背光，而完全以背景光為光源，節省可攜式電子裝置消耗電力。再者，由於前述之第二臨界值LUX2與第一臨界值LUX1有明顯差異，可提供背光控制之遲滯效果，避免背光在一般模式(S100)及日光模式(S110)間急速變換，以避免使用者觀看不適。In the daylight mode (S110), when the brightness of the backlight is less than a second threshold LUX2, the controller 100 sets the portable electronic device back to the normal mode (S100), and in the normal mode, the controller The LCD backlight driver 110 controls the user to preset the brightness, and controls the button backlight unit 112 to preset the brightness for the user. For example, the user preset brightness may be the maximum (100%) brightness. The aforementioned second threshold LUX2 is significantly smaller than the first threshold LUX1, for example, the first threshold LUX1 is 2000 lumens (as in daylight) and the second threshold LUX2 is 1000 lumens. Therefore, when the background light is sufficient, the backlight can be turned off, and the backlight is used as the light source, which saves power consumption of the portable electronic device. Furthermore, since the second threshold LUX2 is significantly different from the first threshold LUX1, the hysteresis effect of the backlight control can be provided, and the backlight can be quickly changed between the normal mode (S100) and the daylight mode (S110) to avoid use. Watch the discomfort.
在一般模式(S100)下，且當背景光亮度小於一第三臨界值LUX3時，該控制器100會將該可攜式電子裝置設定在夜間模式(S120)，其中在夜間模式下，該控制器100控制該LCD背光驅動器110為一較小亮度，及控制該按鍵背光單元112為較小亮度，例如該較小亮度可以為最大亮度之30%，以使使用者在微弱光線下仍可以清楚看出LCD顯示內容。在夜間模式(S120)下，當背景光亮度大於一第四臨界值LUX4時，該控制器100會將該可攜式電子裝置設定返回一般模式(S100)。前述之第三臨界值LUX3明顯小於第四臨界值LUX4，例如第三臨界值LUX3為100流明，而第四臨界值LUX4為150流明。因此避免背光在一般模式(S100)及夜間模式(S120)間急速變換，以避免使用者觀看不適。In the normal mode (S100), and when the backlight brightness is less than a third threshold LUX3, the controller 100 sets the portable electronic device in the night mode (S120), wherein in the night mode, the control The controller 100 controls the LCD backlight driver 110 to have a small brightness, and controls the button backlight unit 112 to have a small brightness. For example, the small brightness may be 30% of the maximum brightness, so that the user can still be clear under weak light. See the LCD display content. In the night mode (S120), when the brightness of the background light is greater than a fourth threshold LUX4, the controller 100 sets the portable electronic device back to the normal mode (S100). The aforementioned third critical value LUX3 is significantly smaller than the fourth critical value LUX4, for example, the third critical value LUX3 is 100 lumens, and the fourth critical value LUX4 is 150 lumens. Therefore, the backlight is prevented from being rapidly changed between the normal mode (S100) and the night mode (S120) to prevent the user from viewing discomfort.
參見第四圖，為依據本發明方法操作之一可攜式電子裝置之背光亮度調整曲線，可看出本發明之方法會在背光亮度調整曲線中提供至少一個遲滯迴路，以使可攜式電子裝置不會因背景光亮度變化而有畫面急遽明暗變化的問題。再者使用者僅需設定在一般模式(預設模式)下之背光設定，即可在日光、一般亮度環境、夜間皆可清楚觀看可攜式電子裝置之液晶螢幕，大幅降低操作難度及提升可攜式電子裝置之使用便利性。Referring to the fourth figure, for the backlight brightness adjustment curve of a portable electronic device operating according to the method of the present invention, it can be seen that the method of the present invention provides at least one hysteresis loop in the backlight brightness adjustment curve to enable the portable electronic The device does not have the problem of sharp and dark changes in the brightness of the background light. In addition, the user only needs to set the backlight setting in the normal mode (preset mode), so that the LCD screen of the portable electronic device can be clearly viewed in daylight, general brightness environment and nighttime, thereby greatly reducing the operation difficulty and improving. The ease of use of portable electronic devices.
綜上所述，當知本發明已具有產業利用性、新穎性與進步性，又本發明之構造亦未曾見於同類產品及公開使用，完全符合發明專利申請要件，爰依專利法提出申請。In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.
C1,C2．．．臨界值C1, C2. . . Threshold
100．．．控制器100. . . Controller
102．．．光感測器102. . . Light sensor
104．．．類比數位轉換器104. . . Analog digital converter
110．．．液晶顯示器(LCD)背光驅動器110. . . Liquid crystal display (LCD) backlight driver
112．．．按鍵背光單元112. . . Key backlight unit
120．．．LCD120. . . LCD
S100-S120S100-S120
第一圖為一習知亮度調整裝置之背光亮度調整曲線。The first figure is a backlight brightness adjustment curve of a conventional brightness adjusting device.
第二圖為為依據本發明方法操作之一可攜式電子裝置。The second figure is a portable electronic device that operates in accordance with the method of the present invention.
第三圖為依據本發明之可攜式電子裝置之遲滯式背光調整方法狀態圖。The third figure is a state diagram of a hysteresis backlight adjustment method of the portable electronic device according to the present invention.
第四圖為依據本發明方法操作之一可攜式電子裝置之背光亮度調整曲線。The fourth figure is a backlight brightness adjustment curve of a portable electronic device operating in accordance with the method of the present invention.
S100-S120S100-S120
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| US20020101166A1 (en) * | 2000-12-29 | 2002-08-01 | Weindorf Paul F. L. | Luminance control of automotive displays using an ambient light sensor |
| TW200620964A (en) * | 2004-12-08 | 2006-06-16 | Mitac Int Corp | Handheld electronic device with automatically adjusted backlight brightness and the method thereof |
| US20070171182A1 (en) * | 2006-01-25 | 2007-07-26 | Renesas Technology Corp. | Light control circuit and a liquid-crystal-display control drive device |
| US20070268241A1 (en) * | 2006-05-16 | 2007-11-22 | Hiroyuki Nitta | Display Device |
| US20080078921A1 (en) * | 2006-08-25 | 2008-04-03 | Motorola, Inc. | Multiple light sensors and algorithms for luminance control of mobile display devices |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020101166A1 (en) * | 2000-12-29 | 2002-08-01 | Weindorf Paul F. L. | Luminance control of automotive displays using an ambient light sensor |
| TW200620964A (en) * | 2004-12-08 | 2006-06-16 | Mitac Int Corp | Handheld electronic device with automatically adjusted backlight brightness and the method thereof |
| US20070171182A1 (en) * | 2006-01-25 | 2007-07-26 | Renesas Technology Corp. | Light control circuit and a liquid-crystal-display control drive device |
| US20070268241A1 (en) * | 2006-05-16 | 2007-11-22 | Hiroyuki Nitta | Display Device |
| US20080078921A1 (en) * | 2006-08-25 | 2008-04-03 | Motorola, Inc. | Multiple light sensors and algorithms for luminance control of mobile display devices |
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