CN108227969B - 用于光学鼠标的发光二级管电流斜波处理方法 - Google Patents

用于光学鼠标的发光二级管电流斜波处理方法 Download PDF

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CN108227969B
CN108227969B CN201710077493.2A CN201710077493A CN108227969B CN 108227969 B CN108227969 B CN 108227969B CN 201710077493 A CN201710077493 A CN 201710077493A CN 108227969 B CN108227969 B CN 108227969B
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彭桂莉
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G06F1/3259—Power saving in cursor control device, e.g. mouse, joystick, trackball
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0317—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03543—Mice or pucks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0383—Signal control means within the pointing device
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract

本发明公开一种用于光学鼠标的发光二级管电流斜波处理方法，所述方法包含：决定该光学鼠标的速度；根据所决定的该速度来设定多个控制位元；将该些控制位元传送至该光学鼠标的一数位电路；以及对该些控制位元进行解码，以选择性地开启或关闭该光学鼠标的一恒定电流发光二级管驱动器中的多个开关，进而根据该速度来调整一电流。

Description

用于光学鼠标的发光二级管电流斜波处理方法
技术领域
本发明涉及一种光学鼠标，尤其涉及一种用于控制光学鼠标的发光二级管(lightemitting diode,LED)的电流斜波处理方法(current ramping method)。
背景技术
以习知的光学鼠标而言，光学鼠标的LED的电流系设定为在所有速度下保持恒定，但是在高速操作模式下，则有需要提高LED的电流来减少影像模糊(image blurring)以及降低和预闪光(pre-flash)的时间，为了满足上述需求，习知的光学鼠标必须将LED的电流保持在高准位。
然而，上述问题(影像模糊、预闪光)在低速操作模式下并不显著，因此当LED的电流保持在高准位则会大幅增加光学鼠标的功率损耗。
发明内容
有鉴于此，本发明的目的在于是提供跟速度有关的光学鼠标LED电流准位，用以降低功率消耗，尤其是在低速模式下降低功率消耗。
本发明的一实施例提供了一种用于光学鼠标的发光二级管(light emittingdiode,LED)电流斜波处理方法，所述方法包含：决定该光学鼠标的速度；根据所决定的该速度来设定多个控制位元(control bit)；将该些控制位元传送至该光学鼠标的一数位电路；以及对该些控制位元进行解码，以选择性地开启或关闭该光学鼠标的一恒定电流(constant current)LED驱动器中的多个开关，进而根据该速度来调整一电流。
附图说明
图1是为根据本发明一实施例的光学鼠标感应器的示意图。
图2是为本发明以及先前技术的LED电流准位与画面更新率的比对的曲线图。
图3是为本发明以及先前技术的LED功率与画面更新率的比对的曲线图。
附图标号说明：
100光学鼠标感应器
130恒定电流LED驱动器
120像素及模拟前端电路
140振荡器
150数位电路
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
本发明的目的在于提供受速度控制的(speed-controlled)的LED设定，其将实时地升高或降低用于光学鼠标感应器的LED电流。
请参见图1，图1是为根据本发明一实施例的光学鼠标感应器100的示意图。图1的右侧部份是为光学鼠标感应器100的主要功能元件，而左侧部份系为光学鼠标感应器100中的恒定电流LED驱动器130的电路结构。光学鼠标感应器100包含像素及模拟前端电路(pixel and analog front end circuit)120，其中像素及模拟前端电路120包含放大器以及类比数位转换器(analog-to-digital，ADC)电路(未绘示于图中)。此外，光学鼠标感应器100另包含恒定电流LED驱动器130、振荡器140以及数位电路150。数位电路150系用以将光学鼠标的快门速度(shutter speed)通知给像素及模拟前端电路120，并且从像素及模拟前端电路120接收包含多个资料位元的讯号，此外，数位电路150系用以对画面更新率(framerate)进行定义以及解码，振荡器140系用以将时脉速率通知给数位电路150。
数位电路150可向恒定电流LED驱动器130发送控制讯号。在先前技术中，电流的准位将不随速度变化，本发明则利用在控制讯号ctrl<n：0>上的位元来改变当前的电流准位。如图1左侧的电路图所示，控制位元ctrl<n：0>系用以对LED驱动器130内的开关进行开启和关闭，以使得提供给LED的电流得以改变。此外，数位电路150会依据速度及画面更新率临界值来对在控制讯号上所选取的特定位元进行解码。
请参考表1，其系为LED电流准位对应于光学鼠标感应器的速度以及画面更新率的改变的对照表。
表1
Figure BDA0001223533640000031
参见图2，图2是为本发明以及先前技术的电流准位与速度的比对的曲线图。如图2中虚线部份所示，无论传统鼠标的LED的速度为何，电流准位皆为恒定。在本发明中，电流准位的会根据速度的增加而斜波上升(ramped up)。在较低的速度下，本发明对画面周期和速度表现有较宽松的要求，并且在低LED电流准位下仍然可以正常地实现鼠标追踪的操作。请注意，脉波宽度在较低的电流准位(88μs，电流准位为4mA)时略微延长。在较高速度下，即当画面更新率为15,000fps或更大、且最小帧周期为67μs时，此期间感应器必须用足够锐利的影像来完成影像采集，以在这些较高速度下实现适当的追踪。因此，LED电流会提升到最高准位。
如发明内容所述，本发明依据速度来对LED电流进行斜波处理的有益之处在于可大幅降低功率损耗。请参考表2，表2列举了本发明相较于先前技术的省电比率。
表2
Figure BDA0001223533640000041
参见图3，图3是为本发明以及先前技术的LED功率与速度的比对的曲线图。如图3虚线部份所示，传统的LED功率损耗会以恒定的方式增加，而本发明的LED功率损耗会以阶段的方式增加(例如在画面更新率为250ips之处，其中ips为image per second的缩写)，而在250ips之后本发明的LED平均功率与速度之间的关系曲线与先前技术大致相同。
值得注意的是，虽然在图3的范例中共有4个阶段的上升，但在实作上，本发明并不限制电流斜波上升的阶段的数量。此外，虽然用来代表本发明之方法的曲线呈现出电流是逐渐地对应于速度而改变，但本发明不以此为限，在其他实施例中电流对应于速度的改变亦可用瞬时步阶(instantaneous step)的方式来实现，例如，光学鼠标最初以小于40ips的速度移动，然后突然地增加到超过400ips，这种瞬时变化的实作方式可透过利用参数变化调节LED电流的数位算法来实现。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (5)

1.一种用于光学鼠标的发光二级管电流斜波处理方法，其特征在于，所述方法包含：
决定该光学鼠标的速度；
根据所决定的该速度来设定多个控制位元；
将该些控制位元传送至该光学鼠标的一数位电路；以及
对该些控制位元进行解码，以选择性地开启或关闭该光学鼠标的一恒定电流LED驱动器中的多个开关，进而根据该速度来调整该光学鼠标的发光二极管的一电流。
2.根据权利要求1所述的发光二级管电流斜波处理方法，其特征在于，其中该电流在该光学鼠标的速度处于低速时为低准位并且在该光学鼠标的速度处于高速时进行斜波上升。
3.根据权利要求2所述的发光二级管电流斜波处理方法，其特征在于，其中该电流进行多个阶段的斜波上升。
4.根据权利要求2所述的发光二级管电流斜波处理方法，其特征在于，其中该电流进行单一阶段的斜波上升并且当画面更新率为15,000fps或更大、且最小帧周期为67μs时该电流上至一最高准位。
5.根据权利要求1所述的发光二级管电流斜波处理方法，其特征在于，其中对该些控制位元进行解码的步骤系根据一画面更新率临界值来执行。
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