CN101765265A - Keyboard backlight device and control method thereof - Google Patents
Keyboard backlight device and control method thereof Download PDFInfo
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- CN101765265A CN101765265A CN200810189715A CN200810189715A CN101765265A CN 101765265 A CN101765265 A CN 101765265A CN 200810189715 A CN200810189715 A CN 200810189715A CN 200810189715 A CN200810189715 A CN 200810189715A CN 101765265 A CN101765265 A CN 101765265A
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Abstract
The invention discloses a keyboard backlight device and a control method thereof, and the keyboard backlight device comprises a backlight control unit, a keyboard backlight source and an optical sensing unit. The optical sensing unit is used for sensing an external brightness and outputting an external brightness signal to the backlight control unit accordingly, the backlight control unit is used for converting the external brightness signal to an external brightness value and comparing the external brightness value with an external brightness default value, when the external brightness value is smaller than or equal to the external brightness default value, the backlight control unit can automatically open the keyboard backlight source and adjust the brightness of the keyboard backlight source according to a keyboard brightness default value.
Description
Technical field
The invention relates to a kind of backlighting device for keypad, and particularly relevant for a kind of backlighting device for keypad and its control method that can adjust backlight illumination according to extraneous brightness.
Background technology
Notebook is a kind of small-sized, portable personal computer.Current development trend is that volume is more and more littler, and weight is more and more lighter, and function is powerful all the more.For reduced volume, notebook has LCD usually.Except keyboard, Trackpad (touchpad) or touch point also can be housed as indicator device (Pointing device).
Along with the progress of science and technology, notebook not only external form is frivolous and multiple functional, becomes cheap because its convenience that carries and price heal, and therefore the trend that replaces desktop PC gradually arranged.The use of notebook at present is quite general, and becomes indispensable outfit in modern's life and the work.Notebook functional and convenience and user's operating efficiency or life ﹠ amusement in the use is closely related.
Yet when sometimes will use a computer evening out of doors, if there is not extraneous light source irradiation keyboard, the user just can't see the key position of keyboard clearly, can only go input with fortune.Even the device that can shine keyboard is arranged on the machine, also must expend more electric power, and can't adjust according to the brightness in the external world.
Summary of the invention
The invention provides a kind of backlighting device for keypad that is applicable to notebook, the user can be in basic input output system menu (Basic Input/Output system menu, be called for short the BIOS menu) middle extraneous brightness default value and the keypad brightness default value set, system can cross when low in extraneous brightness, initiatively opens the keyboard backlight and adjusts its brightness according to the keypad brightness default value.
The invention provides a kind of method of supervisory keyboard backlight illumination, the user can set extraneous brightness default value and keypad brightness default value in the basic input output system menu, system can cross when low in extraneous brightness, initiatively opens the keyboard backlight and adjusts its brightness according to the keypad brightness default value.
Hold above-mentionedly, the present invention proposes a kind of backlighting device for keypad, is applicable to the keyboard back light brightness of adjusting notebook, and this backlighting device for keypad comprises a backlight control unit and a smooth sensing unit.Wherein, backlight control unit is in order to control the brightness in a keyboard back light source, and the light sensing unit is coupled to backlight control unit, exports an extraneous luminance signal to backlight control unit in order to sensing one extraneous brightness and according to extraneous brightness.Then, backlight control unit is converted to an extraneous brightness value and a more extraneous brightness value and an extraneous brightness default value with extraneous luminance signal, when extraneous brightness value is less than or equal to extraneous brightness default value, backlight control unit is opened the keyboard backlight, and adjusts the brightness in keyboard back light source according to a keypad brightness default value.When extraneous brightness value during greater than extraneous brightness default value, backlight control unit is closed this keyboard back light source.
In an embodiment of the present invention, above-mentioned backlighting device for keypad more comprises a basic input output system, is coupled to backlight control unit and provides a keypad brightness menu to set above-mentioned extraneous brightness default value and above-mentioned keypad brightness default value to the user in a basic input output system menu.
In an embodiment of the present invention, the default brightness value of above-mentioned keyboard comprises complete dark, low-light level, middle brightness and four kinds of grades of high brightness, and the default brightness value of above-mentioned keyboard comprises complete dark, low-light level, middle brightness and four kinds of grades of high brightness.
In an embodiment of the present invention, wherein this light sensing unit comprises a resistance and a photo resistance.One end of resistance is coupled to a voltage source, and photo resistance is coupled between the other end and an earth terminal of resistance, and wherein one of resistance and photo resistance shared node is exported above-mentioned extraneous luminance signal.
In an embodiment of the present invention, wherein above-mentioned keyboard back light source comprises a light-emitting diode (LED) module and a resistance, light-emitting diode (LED) module is coupled to backlight control unit, the other end then is coupled to resistance, and wherein backlight control unit is exported a pulse-width signal to the brightness of light-emitting diode (LED) module with adjustment keyboard back light source.
In an embodiment of the present invention, above-mentioned keyboard controller is an embedded controller (embeddedcontroller).
In an embodiment of the present invention, above-mentioned backlight control unit more comprises an analog-digital converter, in order to extraneous luminance signal is converted to a digital signal, the length of this digital signal is 8, and the numerical value that wherein extraneous brightness value equals this digital signal partly adds 1 divided by the integer of 86 quotient.
From another viewpoint, the present invention proposes a kind of control method of backlighting device for keypad in addition, comprise the following steps: at first, in the basic input output system menu, provide a keypad brightness menu to set an extraneous brightness default value and a keypad brightness default value to a user; Then, an extraneous luminance signal is also exported in sensing one extraneous brightness according to this; Extraneous luminance signal is converted to an extraneous brightness value; More extraneous brightness value and extraneous brightness default value when extraneous brightness value is less than or equal to extraneous brightness default value, are opened a keyboard back light source, and adjust the brightness in keyboard back light source according to the keypad brightness default value.
Based on above-mentioned, the present invention provides the keypad brightness menu to set extraneous brightness default value and keypad brightness default value to the user in the BIOS menu.When extraneous brightness default value that extraneous brightness is lower than that the user sets, system just can initiatively open keyboard back light and adjust backlight illumination according to the keypad brightness default value that the user sets.By this, the user can use keyboard more easily and can reduce unnecessary power supply waste under the environment of insufficient light.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the circuit diagram according to the backlighting device for keypad of first embodiment of the invention.
Fig. 2 is the backlight brightness regulation method flow chart according to first embodiment of the invention.
Fig. 3 is the control method according to the backlighting device for keypad of second embodiment of the invention.
Embodiment
First embodiment
Please refer to Fig. 1, Fig. 1 is the circuit diagram according to the backlighting device for keypad of first embodiment of the invention.Backlighting device for keypad 100 comprises basic input output system 110, backlight control unit 120, light sensing unit 130 and keyboard back light source 140.Light sensing unit 130 mainly is composed in series by resistance 132 and photo resistance 134, and keyboard back light source 140 comprises light-emitting diode (LED) module 142 and resistance 144.Backlight control unit 120 is coupled to the basic input output system 110 in the system, and light sensing unit 130 and keyboard back light source 140 then are respectively coupled to two pin A/D, PWM of backlight control unit 120.
Keyboard back light source 140 mainly is made up of light-emitting diode (LED) module 142 and resistance 144, and light-emitting diode (LED) module 142 is connected with resistance 144 and is coupled between the pin PWM and earth terminal GND of backlight control unit 120.Comprise one or more light-emitting diodes in the light-emitting diode (LED) module 142, can adjust its brightness according to the pulse-width signal PWMS that backlight control unit 120 is exported.Light-emitting diode (LED) module 142 can utilize booster circuit (not illustrating) that pulse-width signal PWMS is converted to suitable direct voltage to come the driven for emitting lights diode usually, and wherein the brightness meeting of light-emitting diode is corresponding to the duty ratio (duty cycle) of pulse-width signal PWMS.Can directly utilize backlight module commonly used to replace about light-emitting diode (LED) module 142, present embodiment does not limit its type.
In the present embodiment, basic input output system 110 can provide a keypad brightness menu to set required extraneous brightness default value and keypad brightness default value to the user in its BIOS menu.The user can be directly sets in the BIOS menu need the backlight illumination opening keyboard back light and opened under which kind of situation.In the present embodiment, extraneous brightness default value can be divided into three kinds of grades, is respectively low-light level, middle brightness and high brightness, and that the keypad brightness default value then is divided into is complete dark, low-light level, middle brightness and four kinds of grades of high brightness.If the user is set at low-light level with extraneous brightness default value, the keypad brightness default value is set at high brightness, expression is worked as the extraneous brightness value that is sensed when being less than or equal to low-light level, and backlight control unit 120 can be opened keyboard backlights 140 and the brightness in keyboard back light source 140 is adjusted to high brightness.
It should be noted that if the user is set at the keypad brightness default value entirely secretly why keyboard backlight 140 is opened in neither meeting no matter then represent extraneous brightness.In the computing of reality, extraneous brightness default value can utilize 1,2,3 numerical value to represent three kinds of grades such as its low-light level, middle brightness and high brightness respectively, and the keypad brightness default value can utilize 0,1,2,3 numerical value to represent four kinds of grades such as its complete dark, low-light level, middle brightness and high brightness.Then, backlight control unit 120 can be converted to 8 digital signal with extraneous luminance signal LS, and the numerical value that extraneous brightness value equals digital signal partly adds 1 divided by the integer of 86 quotient.
By aforementioned calculation, extraneous brightness value can so just can be compared to learn whether extraneous brightness is less than or equal to the extraneous brightness default value that the user sets with above-mentioned extraneous brightness default value between 1～3.The duty ratio of the brightness pulse-width signal PWMS of supervisory keyboard backlight illumination is then decided by the keypad brightness default value.If with the pulse-width signal PWMS of numeric representation most bright value is 255, then equals the keypad brightness default value and multiply by 85 corresponding to the numerical value of the pulse-width signal PWMS of keypad brightness default value.Numerical values recited that it should be noted that pulse-width signal PWMS is promptly represented the size of its duty ratio.
Next, be example further with above-mentioned numerical operation, the backlight brightness regulation method of present embodiment is described, please refer to Fig. 2, Fig. 2 is the backlight brightness regulation method flow chart according to first embodiment of the invention.At first, the keypad brightness default value that reads among the BIOS is a (step S210), judges then whether a equals 0 (step S220); Equal 0 expression keypad brightness default value for complete dark as if a, then enter step S280, make pulse-width signal PWMS anergy (being that value corresponding is 0), no matter why keyboard backlight 140 is opened in neither meeting in just extraneous brightness; If a is not equal to 0, then enter step S230.In step S230, further read among the BIOS outside boundary's brightness default value be b.Then, the sensing value (being above-mentioned digital signal) that reads extraneous brightness is c (step S240).
Next, calculating extraneous brightness value is d, and d equals c and partly adds 1 (step S250) divided by the integer of 86 quotient.Then, more extraneous brightness value and extraneous brightness default value judge that promptly whether b is more than or equal to d (step S260).If b then represents extraneous luminance shortage more than or equal to d, then output pulse width modulation signal PWMS to be to open keyboard backlight 140, and wherein the numerical value of pulse-width signal PWMS equals a and multiply by 85 (step S270).
It should be noted that the aforementioned calculation mode mainly is that brightness is divided into several grades to compare, present embodiment is not limited to the aforementioned calculation mode.The grade of the keypad brightness default value of extraneous brightness default value is not subject to present embodiment yet.The present technique field has knows that usually the knowledgeable should know all the other feasible analysis modes by inference easily after via the present invention's exposure, do not add at this and give unnecessary details.
Second embodiment
By another viewpoint, above-mentioned first embodiment can summarize a kind of control method of backlighting device for keypad, please refer to Fig. 3, and Fig. 3 is the control method according to the backlighting device for keypad of second embodiment of the invention.At first, in the basic input output system menu, provide a keypad brightness menu to set an extraneous brightness default value and a keypad brightness default value (step S310) to a user.Then, sensing one extraneous brightness is also exported an extraneous luminance signal (step S320) according to extraneous brightness, then extraneous luminance signal is converted to an extraneous brightness value (step S330).Then, more extraneous brightness value and extraneous brightness default value when extraneous brightness value is less than or equal to extraneous brightness default value, are opened a keyboard back light source, and adjust the brightness (step S340) in keyboard back light source according to the keypad brightness default value.In addition, in step S340, more comprise when extraneous brightness value during, then the closing keyboard backlight greater than extraneous brightness default value.
By the foregoing description as can be known, the user can cross the brightness that can open the keyboard backlight automatically when hanging down and adjust the keyboard back light source according to the keypad brightness default value that the user sets when system senses extraneous brightness directly by setting extraneous brightness default value in the BIOS menu.It should be noted that the user can set many group extraneous brightness default values and corresponding keypad brightness default value at the BIOS menu, the keypad brightness that system like this just can be opened according to different extraneous brightness adjustment.The setting of the extraneous brightness default value of many groups is analogizing of present embodiment only, and the present technique field has knows that usually the knowledgeable should know its implementation detail by inference easily after via the exposure of present embodiment, does not repeat them here.
In sum, the invention provides a kind of backlighting device for keypad that can determine whether opening keyboard back light according to extraneous light luminance, the user can set via the BIOS menu easily needs to open extraneous brightness conditions backlight and brightness backlight.Design of the present invention not only can be pressed close to the design of hommization, and can reduce unnecessary power supply waste.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is worked as with being as the criterion that claim was defined.
Claims (12)
1. backlighting device for keypad comprises:
One backlight control unit is in order to control the brightness in a keyboard back light source; And
One smooth sensing unit is coupled to this backlight control unit, exports an extraneous luminance signal to this backlight control unit in order to sensing one extraneous brightness and according to this external world's brightness;
Wherein, this backlight control unit should external world's luminance signal be converted to an extraneous brightness value and relatively should an external world's brightness value and an extraneous brightness default value, when this external world's brightness value is less than or equal to this external world's brightness default value, this backlight control unit is opened this keyboard back light source, and adjusts the brightness in this keyboard back light source according to a keypad brightness default value.
2. backlighting device for keypad as claimed in claim 1 is characterized in that, more comprises:
One basic input output system is coupled to this backlight control unit and provides a keypad brightness menu to set this external world's brightness default value and this keypad brightness default value to a user in a basic input output system menu.
3. backlighting device for keypad as claimed in claim 1 is characterized in that, the default brightness value of this keyboard comprises complete dark, low-light level, middle brightness and four kinds of grades of high brightness.
4. backlighting device for keypad as claimed in claim 1 is characterized in that, this external world's brightness default value comprises low-light level, middle brightness and three kinds of grades of high brightness.
5. backlighting device for keypad as claimed in claim 1 is characterized in that, this light sensing unit comprises:
One resistance, an end of this resistance is coupled to a voltage source; And
One photo resistance is coupled between the other end and an earth terminal of this resistance;
Wherein, one of this resistance and this photo resistance shared node is exported this external world's luminance signal.
6. backlighting device for keypad as claimed in claim 1 is characterized in that, this keyboard back light source comprises:
One light-emitting diode (LED) module, this light-emitting diode (LED) module is coupled to this backlight control unit; And
One resistance is coupled between this light-emitting diode (LED) module and the earth terminal;
Wherein, this backlight control unit export a pulse-width signal to this light-emitting diode (LED) module to adjust the brightness in this keyboard back light source.
7. backlighting device for keypad as claimed in claim 1 is characterized in that, this keyboard controller is an embedded controller.
8. backlighting device for keypad as claimed in claim 1 is characterized in that, this backlight control unit more comprises:
One analog-digital converter, in order to should external world's luminance signal being converted to a digital signal, the length of this digital signal is 8,
Wherein, this external world's brightness value numerical value of equaling this digital signal partly adds 1 divided by the integer of 86 quotient.
9. backlighting device for keypad as claimed in claim 1 is characterized in that, when this external world's brightness value during greater than this external world's brightness default value, this backlight control unit is closed this keyboard back light source.
10. the control method of a backlighting device for keypad comprises:
In the basic input output system menu, provide a keypad brightness menu to set an extraneous brightness default value and a keypad brightness default value to a user;
Sensing one extraneous brightness is also exported an extraneous luminance signal according to this external world's brightness;
Should external world's luminance signal be converted to an extraneous brightness value; And
Relatively should external world's brightness value and this external world's brightness default value, when this external world's brightness value is less than or equal to this external world's brightness default value, open a keyboard back light source, and adjust the brightness in this keyboard back light source according to this keypad brightness default value.
11. method as claimed in claim 10 is characterized in that, relatively should external world's brightness value and the step of this external world's brightness default value more comprise:
When this external world's brightness value during, close this keyboard back light source greater than this external world's brightness default value.
12. method as claimed in claim 10 is characterized in that, more comprises in the step that should external world's luminance signal be converted to this external world's brightness value:
Should external world's luminance signal be converted to a digital signal, the length of this digital signal is 8, and the numerical value that wherein should external world's brightness value equals this digital signal partly adds 1 divided by the integer of 86 quotient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810189715 CN101765265B (en) | 2008-12-26 | 2008-12-26 | Keyboard backlight device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810189715 CN101765265B (en) | 2008-12-26 | 2008-12-26 | Keyboard backlight device and control method thereof |
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| CN101765265A true CN101765265A (en) | 2010-06-30 |
| CN101765265B CN101765265B (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810189715 Expired - Fee Related CN101765265B (en) | 2008-12-26 | 2008-12-26 | Keyboard backlight device and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294208A (en) * | 2012-03-05 | 2013-09-11 | 联想(北京)有限公司 | Information processing method and input device and electronic equipment |
| CN103634968A (en) * | 2012-08-23 | 2014-03-12 | 联想(北京)有限公司 | Backlight control method and apparatus |
| CN104125671A (en) * | 2013-04-24 | 2014-10-29 | 鸿富锦精密工业(武汉)有限公司 | Illuminating apparatus |
| CN110379663A (en) * | 2019-07-23 | 2019-10-25 | 苏州市悠越电子有限公司 | A kind of keyboard back light mould group |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1755793A (en) * | 2004-09-29 | 2006-04-05 | 南京Lg同创彩色显示系统有限责任公司 | Display device capable of automatically adjusting brightness and adjusting method thereof |
| EP1780991A1 (en) * | 2005-10-31 | 2007-05-02 | Research In Motion Limited | Automatic screen and keypad brightness adjustment on a mobile handheld electronic device |
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2008
- 2008-12-26 CN CN 200810189715 patent/CN101765265B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1755793A (en) * | 2004-09-29 | 2006-04-05 | 南京Lg同创彩色显示系统有限责任公司 | Display device capable of automatically adjusting brightness and adjusting method thereof |
| EP1780991A1 (en) * | 2005-10-31 | 2007-05-02 | Research In Motion Limited | Automatic screen and keypad brightness adjustment on a mobile handheld electronic device |
| CN101346755A (en) * | 2005-10-31 | 2009-01-14 | 捷讯研究有限公司 | Automatic screen and keypad brightness adjustment on a mobile handheld electronic device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294208A (en) * | 2012-03-05 | 2013-09-11 | 联想(北京)有限公司 | Information processing method and input device and electronic equipment |
| CN103634968A (en) * | 2012-08-23 | 2014-03-12 | 联想(北京)有限公司 | Backlight control method and apparatus |
| CN103634968B (en) * | 2012-08-23 | 2016-03-30 | 联想(北京)有限公司 | A kind of method and device controlling backlight |
| CN104125671A (en) * | 2013-04-24 | 2014-10-29 | 鸿富锦精密工业(武汉)有限公司 | Illuminating apparatus |
| CN110379663A (en) * | 2019-07-23 | 2019-10-25 | 苏州市悠越电子有限公司 | A kind of keyboard back light mould group |
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| CN101765265B (en) | 2013-07-17 |
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Effective date of registration: 20170817 Address after: Room 8, building 805, sunshine times, Fenghuang Road, Fenghuang County, Shangrao, Jiangxi, Shangrao Co-patentee after: Zhang Kaijun Patentee after: Jiangxi union Speed Technology Co.,Ltd. Address before: Qingnian Road Taiwan Wanhua District of Taipei city China No. 184 3 2 floor Patentee before: Fucheng International Machinery Co.,Ltd. Effective date of registration: 20170817 Address after: Qingnian Road Taiwan Wanhua District of Taipei city China No. 184 3 2 floor Patentee after: Fucheng International Machinery Co.,Ltd. Address before: Taipei City, Taiwan Chinese Shilin District Hougang Street No. 66 Patentee before: Yingda Co.,Ltd. |
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