CN100364022C - Keyboard back light device and its method - Google Patents
Keyboard back light device and its method Download PDFInfo
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- CN100364022C CN100364022C CNB2004100837756A CN200410083775A CN100364022C CN 100364022 C CN100364022 C CN 100364022C CN B2004100837756 A CNB2004100837756 A CN B2004100837756A CN 200410083775 A CN200410083775 A CN 200410083775A CN 100364022 C CN100364022 C CN 100364022C
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Abstract
The present invention provides a keyboard backlight device and a method thereof, which comprises at least one LED at the periphery of each keyboard backlight luminous point, an LED driver for driving the LED to emit light, an LED drive control unit for outputting modulation signals and modulating the output voltage or circuits of the LED driver, and a keyboard backlight setting module which is connected with the LED drive control unit and used for controlling the modulation signals. At least one LED is arranged at the periphery of each keyboard backlight luminous point, pulse-modulated signals are output by the LED drive control unit, and the output voltage or current of the LED driver is controlled through the modulation signals so as to regulate the brightness of the LED and control the color and the brightness of keyboard backlight. The present invention can conveniently change the brightness of backlight, achieve the variation of backlight color, change the monotonicity of keyboard backlight, and increase the fashion and the interest for mobile phones, etc.
Description
Technical field
The present invention relates to a kind of keyboard device, relate to a kind of backlighting device for keypad and method thereof especially.
Background technology
Big multi-user not only pays attention to its function when selecting electronic product, the fashion of product is the object that they pay close attention to interest equally, especially shows the pursuit to color, and the backlight of portable terminal keyboard is an aspect that shows product color.Portable terminal, especially mobile phone all have backlight function usually, though so also can be correctly under the dark or the low light level operation keyboard easily.At first, the keyboard back light of mobile phone is a single color, as blue, orange, green, amber etc.But the demonstration backlight of single color has seemed it is very much dull, being difficult to cause again user's attention, so, in order to attract more user, occurred showing that varicolored cell phone keyboard is backlight.The mobile phone that has can provide several background lights simultaneously, and the user can select a kind of as demonstration backlight in several background lights.But the color and the brightness of these several background lights are all fixed, and the user can not regulate voluntarily.
Cell phone keyboard is backlight normally by the luminous generation of special-purpose LED (light-emitting diode) driver drives monochromatic LED.When needs were opened keyboard back light, led driver was activated, then output certain voltage or electric current, thus driving LED is sent the light of constant luminance color constancy.Therefore, the color of cell phone keyboard demonstration backlight at present limited (many seven or eight kinds only), color and brightness all can not be regulated voluntarily, lack flexibility, still seem dullness and stiff can not satisfy user's diversified requirement.
Therefore, the user wishes that more the keyboard back light of mobile phone can have more gorgeous color, and can access the bias light of the color of oneself liking according to the hobby of oneself, so that at different times, the bias light of the own mobile phone of the different arbitrary adjustings of mood increases temperament and interest for user's life.
Therefore, how to satisfy the color requirement of user to keyboard back light, becoming has problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of backlighting device for keypad and method thereof, the LED of different colours is installed around the button luminous point, by the output voltage of control LED modules with different colors or the variation of electric current, not only can change brightness backlight easily, also realized the variation of backlight color, thereby make the user can regulated at will keyboard back light color, the fashion that has improved terminals such as mobile phone be with interesting.The present invention not only can be used for portable terminals such as mobile phone, also can be used for the product that remote control or other have the finger-impu system of needs illumination.
Technical scheme of the present invention is:
A kind of backlighting device for keypad comprises:
The LED of two or more color places the LED of every kind of color around each keyboard back light luminous point;
It is luminous that a plurality of led drivers, each led driver are used to drive the LED of color of the same race;
The LED driving control unit of output modulation signal is used for the output voltage or the electric current of each led driver are modulated;
Keyboard back light is provided with module, links to each other with the LED driving control unit, is used to control modulation signal, thereby controls the luminosity of versicolor LED independently.
The LED of described two or more color is meant: the LED of two kinds of different colours;
The LED of two kinds of different colours is placed around each keyboard luminous point;
The LED of color of the same race is driven by same led driver;
The LED driving control unit of output modulation signal is modulated respectively the output voltage or the electric current of two led drivers, with the luminous relative brightness of the LED that changes two kinds of different colours, realizes the adjusting of backlight color and brightness.
The LED of described two or more color is meant: the LED of three kinds of different colours;
The LED of three kinds of different colours is placed around each keyboard luminous point;
The LED of color of the same race is driven by same led driver;
The LED driving control unit of output modulation signal is modulated respectively the output voltage or the electric current of the led driver of three different colours, with the luminous relative brightness of the LED that changes three kinds of different colours, realizes the adjusting of backlight color and brightness.
The LED of described three kinds of different colours is meant three kinds of LED of red, green, blue.
The LED of the different colours around each key-press backlight luminous point closely arranges in certain sequence.
Described LED driving control unit is a digital baseband processor, according to the fluorescent lifetime of the duty cycle adjustment LED of PWM (pulse-width modulation) pulse signal of its output.
Backlighting device for keypad of the present invention also comprises: transparent light shield, be used for the LED around each key-press backlight luminous point is closed, and form the recombination luminescence point.
The effect of described light shield is to make luminous point brightness even, and color is unified, can adopt inboard frosting technology.
In order to eliminate noise, described led driver available metal radome shielding.
Described LED package dimension is identical, and photoelectric characteristic is similar.
The present invention also provides a kind of keyboard back light method, comprises the steps:
The LED of two or more color is placed around each keyboard back light luminous point;
By LED driving control unit output pulse-modulated signal;
By keyboard back light module is set, sends the change color backlight and the signal of brightness to the LED driving control unit;
Utilize described modulation signal that the output voltage or the electric current of led driver are controlled, with the brightness regulation of realization LED, thus the color and the brilliance control of realization keyboard back light.
Three kinds of LED of RGB are placed around each keyboard back light luminous point;
By LED driving control unit output pulse-modulated signal;
Utilize described modulation signal that the output voltage or the electric current of led driver are controlled, regulate, thereby realize the color of keyboard back light and the control of brightness regulation with the relative brightness that realizes LED.
Beneficial effect of the present invention is: the variation of output voltage by the control LED modules with different colors, not only can change brightness backlight easily, and also realized the luminous point change in color; Especially utilize the three primary colors principle, at luminous point three kinds of LED of red, green, blue are installed, by regulating the luminous intensity of three kinds of LED of RGB, conversion goes out multiple backlight color, thereby can allow the color of user's free adjustment keyboard back light, change the monotonicity of keyboard back light, increased the fashion and the interest of mobile phone etc.
Description of drawings
Fig. 1 is the circuit diagram of LED driven for emitting lights of the present invention;
Fig. 2 is layout and the light shield schematic diagram of LED on pcb board of luminous point of the present invention;
Fig. 3 is the interface schematic diagram of the adjusting keyboard back light of the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings, describe preferred embodiment of the present invention in detail.
With three kinds of topmost coloured light-red, green and blues that obtain after the white light decomposition, almost just can obtain all coloured light of occurring in nature with different mixed.The primary light of this composition white light and other coloured light is called primitive color light, so primitive color light is made up of three kinds of coloured light of red, green, blue, and this is the three primary colors principles.Present embodiment is based on the three primary colors principle, utilize the backlight matched combined of Red Green Blue, by regulating the luminous intensity of three kinds of LED, be the strong and weak relatively of color, conversion goes out multiple backlight color, thereby can allow the color and the brightness of user's free adjustment keyboard back light, change the monotonicity of keyboard back light, increase fashion and interest.
Backlighting device for keypad of the present invention comprises following structure:
RGB three kinds of LED, led driver, digital baseband processor and keyboard back lights are provided with module.
Described digital baseband processor is used to export modulation signal, and the output voltage or the electric current of led driver are modulated;
Described keyboard back light is provided with module and links to each other with digital baseband processor, is used to control modulation signal.
Each keyboard back light luminous point is installed three LED of red, green, blue of close proximity, and three LED of the red, green, blue of each luminous point closely arrange in certain sequence.Fig. 1 is the circuit diagram of LED driven for emitting lights of the present invention.As shown in Figure 1, all red LED are by a driver drives, and all green LED are by a driver drives, and all blue leds are by a driver drives equally; Three PWM (pulse-width modulation) pulse signal of digital baseband processor output is used for controlling respectively the working condition of three led drivers, change the strong and weak relatively of three kinds of colors of red, green, blue by the fluorescent lifetime length of regulating three kinds of LED, thereby realize the change color of luminous point.In order to make bias light even, require the package dimension of all LED identical, and photoelectric characteristic is similar.
The frequency of digital baseband processor output pwm signal is 100Hz in the present embodiment, duty ratio byte Variable Control in the software, and regulating rank is 256.The adjusting of the fluorescent lifetime length of LED is recently realized by the duty of regulating pwm pulse.
In order to eliminate the noise that starts and cause when closing the switching noise of led driver and DC/DC work, the shielding of led driver available metal radome.
, even brightness keyboard back light that color is unified in order to obtain, the backlighting device for keypad of present embodiment also comprises light shield.Utilize light shield that described three LED are closed, form the recombination luminescence point; The main effect of light shield is a mixed light, that is, the brightness that each luminous point is sent is even, and color is unified, and in order further to improve the effect of mixed light, described light shield can adopt inboard frosting technology.The LED of luminous point of the present invention on pcb board layout and the light shield schematic diagram as shown in Figure 2.Red LED, blue led and green LED order are closely arranged, and cover with the light shield of inboard frosted.Light shield can also can adopt the manufacturing of milky transparent material with transparent material manufacturings such as glass or polymethyl methacrylate.
For the ease of keyboard back light is provided with, backlighting device for keypad of the present invention also comprises: keyboard back light is provided with software, is used to provide the menu item that keyboard back light is set or/and shortcut.The user is the intensity of three kinds of colors of regulating and controlling red, green, blue independently, thereby obtain versicolor keyboard back light.Or/and shortcut can carry out self-defined setting to keyboard back light, shortcut can make the user that backlight color is set and become convenient according to the menu item of keyboard back light.
The interface schematic diagram of the adjusting keyboard back light of the embodiment of the invention as shown in Figure 3.The user can select in the keyboard back light color that pre-defines after selecting " presetting color ", as peony, emerald green, turquoise etc.The user also can directly revise these colors, by the intensity of three kinds of colors of options button control, the backlight color that obtains wanting.
The user just can arbitraryly be provided with the color of oneself liking like this.
Keyboard back light method of the present invention comprises:
RGB three LED are installed around each cell phone keyboard luminous point, and the LED of each key-press backlight luminous point closely arranges in certain sequence;
All red LED are by a driver drives, and all green LED are driven by a led driver, and all blue leds are driven by a led driver;
Utilize PWM (pulse-width modulation) pulse signal of digital baseband processor output that the output voltage of three led drivers is modulated respectively, by regulating the duty cycle adjustment LED output voltage duty of ratio of pwm pulse signal, that is, change the fluorescent lifetime of LED.Change the strong and weak relatively of three kinds of colors of red, green, blue by the fluorescent lifetime length of regulating three kinds of LED, thereby realize the color of luminous point and the variation of brightness.
The present invention not only can be used for portable terminals such as mobile phone, also can be used for the product that remote control or other have the finger-impu system of needs illumination.
Utilize the three primary colors principle, by regulating the luminous intensity of three kinds of LED of RGB, conversion goes out multiple backlight color, thereby can allow the color and the brightness of user's free adjustment keyboard back light, change cell phone keyboard monotonicity backlight, increased the fashion and the interest of mobile phone.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (11)
1. backlighting device for keypad is characterized in that comprising:
The LED of two or more color places the LED of every kind of color around each keyboard back light luminous point;
It is luminous that a plurality of led drivers, each led driver are used to drive the LED of color of the same race;
The LED driving control unit of output modulation signal is used for the output voltage or the electric current of each led driver are modulated;
Keyboard back light is provided with module, links to each other with the LED driving control unit, is used to control modulation signal, thereby controls the luminosity of versicolor LED independently.
2. device according to claim 1 is characterized in that, the LED of described two or more color is meant: the LED of two kinds of different colours;
The LED of two kinds of different colours is placed around each keyboard luminous point;
The LED of color of the same race is driven by same led driver;
The LED driving control unit of output modulation signal is modulated respectively the output voltage or the electric current of two led drivers, with the luminous relative brightness of the LED that changes two kinds of different colours, realizes the adjusting of backlight color and brightness.
3. device according to claim 1 is characterized in that, the LED of described two or more color is meant: the LED of three kinds of different colours;
The LED of three kinds of different colours is placed around each keyboard luminous point;
The LED of color of the same race is driven by same led driver;
The LED driving control unit of output modulation signal is modulated respectively the output voltage or the electric current of the led driver of three different colours, with the luminous relative brightness of the LED that changes three kinds of different colours, realizes the adjusting of backlight color and brightness.
4. device according to claim 3 is characterized in that, the LED of described three kinds of different colours is meant: three kinds of LED of red, green, blue.
5. device according to claim 1 is characterized in that, the LED of the different colours around each key-press backlight luminous point closely arranges in certain sequence.
6. device according to claim 1 is characterized in that, described LED driving control unit is a digital baseband processor, according to the fluorescent lifetime of the duty cycle adjustment LED of the pwm pulse signal of its output.
7. device according to claim 1 is characterized in that also comprising: transparent light shield, be used for the LED around each key-press backlight luminous point is closed, and form the recombination luminescence point.
8. device according to claim 7 is characterized in that: described light shield adopts inboard frosting technology.
9. device according to claim 1 is characterized in that described led driver shields with metallic shield.
10. a keyboard back light method is characterized in that, comprises the steps:
The LED of two or more color is placed around each keyboard back light luminous point;
By keyboard back light module is set, sends the change color backlight and the signal of brightness to the LED driving control unit;
By LED driving control unit output pulse-modulated signal;
Utilize described modulation signal that the output voltage or the electric current of led driver are controlled, with the brightness regulation of realization LED, thus the color and the brilliance control of realization keyboard back light.
11. method according to claim 10 is characterized in that:
Three kinds of LED of RGB are placed around each keyboard back light luminous point;
By LED driving control unit output pulse-modulated signal;
Utilize described modulation signal that the output voltage or the electric current of led driver are controlled, regulate, thereby realize the color of keyboard back light and the control of brightness regulation with the relative brightness that realizes LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100837756A CN100364022C (en) | 2004-10-19 | 2004-10-19 | Keyboard back light device and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100837756A CN100364022C (en) | 2004-10-19 | 2004-10-19 | Keyboard back light device and its method |
Publications (2)
| Publication Number | Publication Date |
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| CN1763879A CN1763879A (en) | 2006-04-26 |
| CN100364022C true CN100364022C (en) | 2008-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100837756A Expired - Fee Related CN100364022C (en) | 2004-10-19 | 2004-10-19 | Keyboard back light device and its method |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740253A (en) * | 2008-11-26 | 2010-06-16 | 广州专尚音响器材有限公司 | Colored backlight keyboard |
| CN101840269B (en) * | 2009-03-18 | 2013-05-15 | 新巨企业股份有限公司 | Control method of keyboard generating color change |
| US7712920B1 (en) | 2009-05-08 | 2010-05-11 | Zippy Technology Corp. | Light color adjustment structure for illuminated keyboards |
| DE102009021155A1 (en) | 2009-05-13 | 2010-11-18 | Zippy Technology Corp., Hsin-Tien | Light color adjustment structure for illuminated keyboard, has control module for outputting brightness control signal to light source module to control brightness alteration of light source module to adjust light color of keyboard |
| CN103428966B (en) | 2013-07-11 | 2016-08-10 | 华为终端有限公司 | Key-press backlight processing method, device and terminal unit |
| CN104571569A (en) * | 2015-01-04 | 2015-04-29 | 深圳维盛半导体科技有限公司 | Game keyboard |
| CN104763971B (en) * | 2015-04-24 | 2017-02-22 | 深圳市江湾数码科技有限公司 | Keyboard backlight LED lamp color mixing system |
| CN105430198A (en) * | 2015-10-30 | 2016-03-23 | 宁波萨瑞通讯有限公司 | Device and method used for adjusting handset illumination brightness |
| CN106851926B (en) * | 2017-04-13 | 2019-07-12 | 深圳市信必成实业有限公司 | A kind of backlight keyboard |
| TWI711927B (en) * | 2018-06-25 | 2020-12-01 | 精元電腦股份有限公司 | System and method for computer microprocessor to synchronously output backlight special effects |
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| CN1233901A (en) * | 1998-04-16 | 1999-11-03 | 日本电气株式会社 | Mobile telephone set |
| JP2001103131A (en) * | 1999-09-29 | 2001-04-13 | Nec Saitama Ltd | System and method for reducing power consumption of mobile phone with multi-colored call reception led |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1763879A (en) | 2006-04-26 |
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Owner name: LANGCHAO LEJIN DIGITAL MOBILE COMMUNICATION CO., L Free format text: FORMER OWNER: LG ELECTRONIC (CHINA) RESEARCH + DEVELOPMENT CENTRE CO., LTD. Effective date: 20120309 |
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Effective date of registration: 20120309 Address after: 264006 No. 228 Changjiang Road, Yantai Economic Development Zone, Shandong, China Patentee after: Langchao Lejin Digital Mobile Communication Co., Ltd. Address before: Two Beijing 100102 Chaoyang District city in Wangjing Lize Park No. 203 Petrova building block B Patentee before: LG Electronic (China) Research and Development Center Co., Ltd. |
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